UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
Form 10-K
xANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 20132015
¨TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
  
 For the transition period from ___________________ to __________________
  
 Commission File Number 1-07978

BLACK HILLS POWER, INC.
Incorporated in South Dakota IRS Identification Number 46-0111677
625 Ninth Street, Rapid City, South Dakota 57701
   
Registrant’s telephone number, including area code: (605) 721-1700
   
Securities registered pursuant to Section 12(b) of the Act: None
   
Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.
Yes    x    No    ¨

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.
Yes    x    No    ¨

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
Yes    x    No    ¨

Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files).
Yes    x    No    ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.
This paragraph is not applicable to the Registrant.        x

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company (as defined in Rule 12b-2 of the Exchange Act).
Large accelerated filer    ¨    Accelerated filer    ¨    Non-accelerated filer    x     Smaller reporting company    ¨

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
Yes    ¨    No    x

State the aggregate market value of the voting stock held by non-affiliates of the Registrant.

All outstanding shares are held by the Registrant’s parent company, Black Hills Corporation. Accordingly, the aggregate market value of the voting common stock of the Registrant held by non-affiliates is $0.

Indicate the number of shares outstanding of each of the Registrant’s classes of common stock, as of the latest practicable date.
ClassOutstanding at January 31, 20142016
Common stock, $1.00 par value23,416,396 shares

Reduced Disclosure
The Registrant meets the conditions set forth in General Instruction I (1) (a) and (b) of Form 10-K and is therefore filing this Form 10-K with the reduced disclosure format.





TABLE OF CONTENTS
   
  Page
   
 GLOSSARY OF TERMS AND ABBREVIATIONS
   
ITEMS 1. and 2.BUSINESS AND PROPERTIES
   
ITEM 1A.RISK FACTORS
   
ITEM 1B.UNRESOLVED STAFF COMMENTS
   
ITEM 3.LEGAL PROCEEDINGS
   
ITEM 5.MARKET FOR REGISTRANT’S COMMON EQUITY RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES
   
ITEM 7.MANAGEMENT’S DISCUSSION AND ANALYSIS OF RESULTS OF OPERATIONS
   
ITEM 8.FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
   
ITEM 9.CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
   
ITEM 9A.CONTROLS AND PROCEDURES
   
ITEM 9B.OTHER INFORMATION
   
ITEM 14.PRINCIPAL ACCOUNTING FEES AND SERVICES
   
ITEM 15.EXHIBITS, FINANCIAL STATEMENT SCHEDULES
   
 SIGNATURES
   
 INDEX TO EXHIBITS


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GLOSSARY OF TERMS AND ABBREVIATIONS

The following terms and abbreviations appear in the text of this report and have the definitions described below:
ACAlternating Current
AFUDCAllowance for Funds Used During Construction
AOCIAccumulated Other Comprehensive Income
ASCAccounting Standards Codification
ASUAccounting Standards Update as issued by FASB
Baseload plantA power generation facility used to meet some or all of a given region’s continuous energy demand, producing energy at a constant rate.
Basin ElectricBasin Electric Power Cooperative
BHCBlack Hills Corporation, the Parent of Black Hills Power, Inc.
Black Hills Electric GenerationBlack Hills Electric Generation, LLC, a direct, wholly-owned subsidiary of Black Hills Non-regulated Holdings
Black Hills EnergyThe name used to conduct the business of Black Hills Utility Holdings, Inc., and its subsidiaries
Black Hills Non-regulated HoldingsBlack Hills Non-regulated Holdings, LLC, a direct, wholly-owned subsidiary of BHC
Black Hills Service CompanyBlack Hills Service Company LLC, a direct, wholly-owned subsidiary of Black Hills Corporation
Black Hills Utility HoldingsBlack Hills Utility Holdings, Inc. a direct, wholly-owned subsidiary of BHC
Black Hills WyomingBlack Hills Wyoming, LLC, an indirect, wholly-owned subsidiary of Black Hills Electric Generation, Inc., a subsidiary of Black Hills Non-regulated Holdings
Cheyenne LightCheyenne Light, Fuel and Power Company, a direct, wholly-owned subsidiary of BHC
Cheyenne PrairieCheyenne Prairie Generating Station currently being constructedis a 132 MW natural gas-fired generating facility in Cheyenne, Wyo.Wyoming, jointly owned by Cheyenne Light and Black Hills Power. Construction is expected to be completed for this 132 MW facility inCheyenne Prairie was placed into commercial operations on October 1, 2014.
City of GilletteThe City of Gillette, Wyoming, affiliate of the JPB.
Cooling degree dayA cooling degree day is equivalent to each degree that the average of the high and low temperature for a day is above 65 degrees. The warmer the climate, the greater the number of cooling degree days. Cooling degree days are used in the utility industry to measure the relative warmth of weather and to compare relative temperatures between one geographic area and another. Normal degree days are based on the National Weather Service data for selected locations over a 30 year average.
CTCombustion turbine
CPCNCertificate of Public Convenience and Necessity
CPPClean Power Plan
DCDirect current
DSMDemand Side Management
ECAEnergy Cost Adjustment -- adjustments that allow us to pass the prudently-incurred cost of fuel and purchased power through to customers.
EPAUnited States Environmental Protection Agency
FASBFinancial Accounting Standards Board
FDICFederal Depository Insurance Corporation
FERCFederal Energy Regulatory Commission
FitchFitch Ratings
GAAPAccounting principles generally accepted in the United States of America
GHGGreenhouse gas
Global SettlementSettlement with a utilities commission where the dollar figure is agreed upon, but the specific adjustments used by each party to arrive at the figure are not specified in public rate orders
Happy JackHappy Jack Wind Farms, LLC, a subsidiary of Duke Energy Generation Services

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Heating degree dayA heating degree day is equivalent to each degree that the average of the high and the low temperatures for a day is below 65 degrees. The colder the climate, the greater the number of heating degree days. Heating degree days are used in the utility industry to measure the relative coldness of weather and to compare relative temperatures between one geographic area and another. Normal degree days are based on the National Weather Service data for selected locations over a 30 year average.
IRSInternal Revenue Service
JPBConsolidated Wyoming Municipalities Electric Power System Joint Powers Board. The JPB exists for the purpose of, among other things, financing the electrical system of the City of Gillette. The JPB financed the purchase of 23% of the Wygen III power plant for the City of Gillette.
kVKilovolt
LIBORLondon Interbank Offered Rate

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MAPPMid-Continent Area Power Pool
MATSUtility Mercury and Air Toxics Rules under the United States EPA National Emissions Standards for Hazardous Air Pollutants from Coal and Oil Fired Electric Utility Steam Generating Units
MDUMontana Dakota Utilities Company
MEANMunicipal Energy Agency of Nebraska
Moody’sMoody’s Investor Services, Inc.
MTPSCMontana Public Service Commission
MWMegawatts
MWhMegawatt-hours
N/ANot Applicable
Native loadEnergy required to serve customers within our service territory
NERCNorth American Electric Reliability Corporation
NOLNet operating loss
NOx
Nitrogen oxide
OSHAOccupational Safety and Health Organization
PacifiCorpPacifiCorp, a wholly owned subsidiary of MidAmerican Energy Holdings Company, itself an affiliate of Berkshire Hathaway
Peak System LoadPeak system load represents the highest point of customer usage for a single hour for the system in total. Our system peaks include demand loads for 100% of plants regardless of joint ownership.
PPAPower Purchase Agreement
RMSARetirement Medical Savings Account
SDPUCSouth Dakota Public Utilities Commission
SECUnited States Securities and Exchange Commission
Silver SageSilver Sage Windpower, LLC, a subsidiary of Duke Energy Generation Services
SO2
Sulfur dioxide
S&PStandard & Poor’s Rating Services
Spinning ReserveGeneration capacity that is on-line but unloaded and that can respond within 10 minutes to compensate for generation or transmission outages.
TCATransmission Cost Adjustment - adjustments passed through to the customer based on transmission costs that are higher or lower than the costs approved in the rate case.
Thunder CreekThunder Creek Gas Services, LLC
TIPATax Increase Prevention Act of 2014
WECCWestern Electricity Coordinating Council
WPSCWyoming Public Service Commission
WRDCWyodak Resources Development Corporation, a direct, wholly-owned subsidiary of Black Hills Non-regulated Holdings, LLC


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PART I


Forward-Looking Information

This Form 10-K contains forward-looking statements as defined by the SEC. Forward-looking statements are all statements other than statements of historical fact, including without limitation those statements that are identified by the words “anticipates,” “estimates,” “expects,” “intends,” “plans,” “predicts” and similar expressions, and include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements that are other than statements of historical facts. From time to time, the Company may publish or otherwise make available forward-looking statements of this nature, including statements contained within Item 7 - Management’s Discussion & Analysis.

Forward-looking statements involve risks and uncertainties, which could cause actual results or outcomes to differ materially from those expressed. The Company’s expectations, beliefs and projections are expressed in good faith and are believed by the Company to have a reasonable basis, including without limitation, management’s examination of historical operating trends, data contained in the Company’s records and other data available from third parties. Nonetheless, the Company’s expectations, beliefs or projections may not be achieved or accomplished.

Any forward-looking statement contained in this document speaks only as of the date on which the statement is made, and the Company undertakes no obligation to update any forward-looking statement or statements to reflect events or circumstances that occur after the date on which the statement is made or to reflect the occurrence of unanticipated events. New factors emerge from time to time, and it is not possible for management to predict all of the factors, nor can it assess the effect of each factor on the Company’s business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statement. All forward-looking statements, whether written or oral and whether made by or on behalf of the Company, are expressly qualified by the risk factors and cautionary statements in this Form 10-K, including statements contained within Item 1A - Risk Factors.


ITEMS 1 and 2.    BUSINESS AND PROPERTIES

General

Black Hills Power (“the Company,” “we,” “us” and “our”) is a regulated electric utility incorporated in South Dakota and serving customers in South Dakota, Wyoming and Montana. We began providing electric utility service in 1941. We are a wholly-owned subsidiary of the publicly traded Black Hills Corporation.Corporation (“Parent”). Engaging in the generation, transmission and distribution of electricity provides a solid foundation of revenues, earnings and cash flow that support our capital expenditures, dividends to our Parent, and our overall performance and growth.


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As of December 31, 20132015, our ownership interests in electric generation plants were as follows:
Unit (1)
Fuel
Type
Location
Ownership
Interest %
Owned Capacity (MW)
Year
Installed
Fuel
Type
Location
Ownership
Interest %
Owned Capacity (MW)
Year
Installed
Wygen III (2)(1)
CoalGillette, WY52%57.22010CoalGillette, WY52%57.22010
Neil Simpson IICoalGillette, WY100%90.01995CoalGillette, WY100%90.01995
Wyodak (3)(2)
CoalGillette, WY20%72.41978CoalGillette, WY20%72.41978
Osage (4)
CoalOsage, WY100%34.51948-1952
Ben French(4)
CoalRapid City, SD100%25.01960
Neil Simpson I(4)
CoalGillette, WY100%21.81969
Cheyenne Prairie (3)
GasCheyenne, WY58%55.02014
Neil Simpson CTGasGillette, WY100%40.02000GasGillette, WY100%40.02000
Lange CTGasRapid City, SD100%40.02002GasRapid City, SD100%40.02002
Ben French Diesel #1-5OilRapid City, SD100%10.01965OilRapid City, SD100%10.01965
Ben French CTs #1-4Gas/OilRapid City, SD100%80.01977-1979Gas/OilRapid City, SD100%80.01977-1979
 470.9  444.6 
_______________________
(1)Construction of a gas-fired power generation facility is underway to support the customers of Black Hills Power. The facility will include one combined-cycle, 95 megawatt unit that will be jointly owned by Cheyenne Light (40 MW) and Black Hills Power (55 MW). This facility is expected to be completed in the fourth quarter of 2014.
(2)We operate Wygen III, a 110 MW mine-mouth coal-fired power plant and own a 52% interest in the facility. MDU owns a 25% interest and the City of Gillette owns the remaining 23% interest. WRDC furnishes all of the coal fuel supply for the plant.
(3)(2)Wyodak is a 362 MW mine-mouth coal-fired power plant owned 80% by PacifiCorp and 20% by us. This baseload plant is operated by PacifiCorp and WRDC furnishes all of the coal fuel supply for 100% of the plant.
(4)(3)Operations at Osage were suspended
Cheyenne Prairie, a gas-fired power generation facility includes one combined-cycle, 95 MW unit that is jointly owned by Cheyenne Light (40 MW) and us (55 MW). This facilitywas placed into commercial operations on October 1, 2010 and Ben French were suspended on August 31, 2012 due to the availability of more economical generation alternatives when evaluating costs to retrofit these plants to comply with environmental standards, including EPA regulations. Osage, Ben French and Neil Simpson I will be retired on or before March 21, 2014, the effective compliance date of the EPA Industrial and Commercial Boiler Regulations for Area Sources of Hazardous Air Pollutants regulations. While the net book value of these plants is estimated to be insignificant at the time of retirement, we would reasonably expect any remaining value to be recovered through future rates and costs will be deferred as Regulatory assets on the accompanying Balance Sheets.2014.


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Distribution and Transmission. Our distribution and transmission system serves approximately 69,00071,000 electric customers, with an electric transmission system of 1,179 miles of high voltage lines (greater than 69 kV) and 2,4622,485 miles of lower voltage lines. In addition, we jointly own 44 miles of high voltage lines with Basin Electric. Our service territory covers areas with a strong and stable economic base including western South Dakota, northeastern Wyoming and southeastern Montana. Approximately 90% of our retail electric revenues in 20132015 were generated in South Dakota. We are subject to state regulation by the SDPUC, the WPSC and the MTPSC.

The following are characteristics of our distribution and transmission business:

We have a diverse customer and revenue base. Our revenue mix for the year ended December 31, 20132015 was comprised of 32%36% commercial, 25%26% residential, 9%6% contract wholesale, 12%8% wholesale off-system, 11%12% industrial and 12% municipal and other revenue.

We own 35% and Basin Electric owns 65% of a DC transmission tie that interconnects the Western and Eastern transmission grids, which are independently-operated transmission grids serving the Western United States and the Eastern United States, respectively. This transmission tie provides transmission access to both the WECC region in the West and the MAPP region in the East. Our system is located in the WECC region. The total transfer capacity of the tie is 200 MW from West to East and 200 MW from East to West. This transmission tie allows us to buy and sell energy in the Eastern interconnection without having to isolate and physically reconnect load or generation between the two electrical transmission grids. The transmission tie accommodates scheduling transactions in both directions simultaneously. This transfer capability provides additional opportunity to sell our excess generation or to make economic purchases to serve our native load and our contract obligations, and to take advantage of the power price differentials between the two electric grids. Additionally, our system is capable of directly interconnecting up to 80 MW of generation or load to the Eastern transmission grid. Transmission constraints within the MAPP transmission system may limit the amount of capacity that may be directly interconnected to the Eastern system at any given time.


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We have firm point-to-point transmission access to deliver up to 50 MW of power on PacifiCorp’s transmission system to wholesale customers in the Western region through 2023.

We have firm network transmission access to deliver power on PacifiCorp’s system to Sheridan, Wyoming to serve our power sales contract with MDU through 2017, with the right to renew pursuant to the terms of PacifiCorp’s transmission tariff.

Power Sales Agreements. We sell a portion of our current load under long-term contracts. Our key contracts include:

MDU owns a 25% ownership interest in Wygen III’s net generating capacity for the life of the plant. During periods of reduced production at Wygen III, or during periods when Wygen III is off-line, we will provide MDU with 25 MW from our other generation facilities or from system purchases with reimbursement of costs by MDU.

We have an agreement through December 31, 2023 under which we serve MDU with capacity and energy up to a maximum of 50 MW.

The City of Gillette owns a 23% ownership interest in Wygen III’s net generating capacity for the life of the plant. During periods of reduced production at Wygen III, or during periods when Wygen III is off-line, we will provide the City of Gillette with its first 23 MW from our other generation facilities or from system purchases with reimbursement of costs by the City of Gillette. Under this agreement we will also provide the City of Gillette their operating component of spinning reserves.

•An agreement under which we supply up to 20 MW of energy and capacity to MEAN under a contract that expires in 2023. This contract is unit-contingent based on the availability of our Neil Simpson II and Wygen III plants.plants with decreasing capacity purchased over the term of the agreement. The unit-contingent capacity amounts from Wygen III and Neil Simpson II are as follows:
2014-20172016-201720 MW - 10 MW contingent on Wygen III and 10 MW contingent on Neil Simpson II
2018-201915 MW - 10 MW contingent on Wygen III and 5 MW contingent on Neil Simpson II
2020-202112 MW - 6 MW contingent on Wygen III and 6 MW contingent on Neil Simpson II
2022-202310 MW - 5 MW contingent on Wygen III and 5 MW contingent on Neil Simpson II.

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A PPA with MEAN whereby MEAN will purchase 5 MW of unit-contingent capacity from Neil Simpson II and 5 MW of unit-contingent capacity from Wygen III through May 2015.


Regulated Power Plants and Purchased Power. Our electric load is primarily served by our generating facilities in South Dakota and Wyoming, which provide approximately 471445 MW of generating capacity, with the balance supplied under purchased power and capacity contracts. We generated approximately 56%53% of our energy requirements in 20132015 and purchased approximately 44%47% which was supplied under the following contracts:

A PPA with PacifiCorp expiring in 2023, whereby we purchase 50 MW of coal-fired baseload power.

A PPA with Cheyenne Light expiring in 2028, under which we will purchase up to 14.7 MW of wind energy through Cheyenne Light’s agreement with Happy Jack.

A PPA with Cheyenne Light expiring in 2029, under which we will purchase up to 20 MW of wind energy through Cheyenne Light’s agreement with Silver Sage.

A Generation Dispatch Agreement with Cheyenne Light that requires us to purchase all of Cheyenne Light’s excess energy.

Since 1995, we have been a net producer of energy. Our 20132015 winter peak system load was 403369 MW and our 20132015 summer peak system load was 422424 MW. None of our generation is restricted by hours of operation, thereby providing us the ability to generate power to meet demand whenever necessary and economically feasible. We have historically optimized the utilization of our power supply resources by selling wholesale power to other utilities and to power marketers in the spot market, and through short-term sales contracts primarily in the WECC and MAPP regions. Our 301220 MW of low-cost, coal-fired resources supports most of our native load requirements and positions us for wholesale off-system sales.


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Operating Agreements

Related-party Gas Transportation Service Agreement - On October 1, 2014 we entered into a gas transportation service agreement with Cheyenne Light in connection with gas supply for Cheyenne Prairie. The agreement is for a term of 40 years, in which we pay a monthly service and facility fee for firm and interruptible gas transportation.

Shared Services Agreement - We have a shared services agreement with Cheyenne Light and Black Hills Wyoming whereby each entity charges for the use of assets and the performance of services being used by, or performed for, an affiliate entity. The revenues and expenses associated with these assets are included in rate base.

Jointly Owned Facilities - Black Hills Power,We are parties to an agreement with the City of Gillette and MDU are parties to afor joint ownership agreement, whereby Black Hills Power chargesof Wygen III. We charge the City of Gillette and MDU for administrative services, plant operations and maintenance for their share of the Wygen III generating facility for the life of the plant.

Regulations

Rate Regulation

The following table illustrates certain enacted regulatory information with respect to the states in which we operate:

StateAuthorized Rate of Return on EquityAuthorized Return on Rate BaseCapital Structure Debt/EquityEffective DateOther Tariffs, Riders and Rate MattersPercentage of Off-System Sale Profits Shared with CustomersAuthorized Rate of Return on EquityAuthorized Return on Rate BaseCapital Structure Debt/EquityEffective DateOther Tariffs, Riders and Rate MattersPercentage of Off-System Sale Profits Shared with Customers
SDGlobal Settlement7.93%Global Settlement6/2013ECA,TCA, Energy Efficiency Cost Recovery/ DSM65%Global Settlement7.76%Global Settlement10/2014ECA,TCA, Energy Efficiency Cost Recovery/ DSM70%
SD 8.16% 6/2011Environmental Improvement Cost Recovery Adjustment TariffNA 8.16% 6/2011Environmental Improvement Cost Recovery Adjustment TariffN/A
WY10.5%8.60%48%/52%6/2010TCA, ECA50% subject to symmetrical deadband9.9%8.13%46.7%/53.3%10/2014ECA65%
MT15.0%11.73%47%/53%1983ECANA15.0%11.73%47%/53%1983ECAN/A
FERC10.8%­9.12%43%/57%2/2009FERC Transmission TariffNA10.8%9.10%43%/57%2/2009FERC Transmission TariffN/A


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Rates for our retail electric service are subject to regulation by the SDPUC for customers in South Dakota, the WPSC for customers in Wyoming and the MTPSC for customers in Montana. Any changes in retail rates are subject to approval by the respective regulatory body. We have rate adjustment mechanisms in Wyoming, Montana and South Dakota which provide for pass-through of certain costs related to the purchase, production and/or transmission of electricity. In December 2015, we filed an application with the MTPSC to cancel the Montana Quarterly Fuel Rider and we expect a decision in the first quarter of 2016. We are also subject to the jurisdiction of FERC with respect to accounting practices and wholesale electricity sales. We have been granted market-based rate authority by FERC and are not required to file cost-based tariffs for wholesale electric rates. Rates charged by us for use of our transmission system are subject to regulation by FERC.

In September 2013,Some of the SDPUCmechanisms we have in are:

An approved Cheyenne Prairie’s construction financing rider effective April 1, 2013 whichvegetation management recovery mechanism that allows for recovery of construction financing costs from customers during the construction period in lieu of traditional AFUDC. The rider allows Black Hills Power to earn and collect a rate of return during the construction period on the total project cost that relates to South Dakota customers. This rider is similar to the rider approved by WPSC effective November 1, 2012 which allows Black Hills Power to earn and collect a rate of return during the construction period on approximately 60 percent of the total project cost that relates to Wyoming customers. These riders increased gross margin by approximately $2.7 million in 2013.

In South Dakota, Wyoming and Montana, we have cost adjustment mechanisms that allow us to pass to our customers the prudently-incurred cost of fuel and purchased power.vegetation management costs.

In South Dakota we have an annual adjustment clause which provides for the direct recovery of increased fuel and purchased power incurred to serve South Dakota customers. Additionally, the ECA contains an off-system sales sharing mechanism in which South Dakota customers receive a credit equal to 65 percent70% of off-system power marketing operating income. The modification also adjusts the methodology to directly assign renewable resources and firm purchases to the customer load. Wyoming has a similar Fuel and Purchased Power Cost Adjustment.

In South Dakota we have an approved annual Environmental Improvement Cost Recovery Adjustment tariff that went into effect June 1, 2011 and recovers costs associated with generation plant environmental improvements.


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We have an approved FERC Transmission Tariff based on a formulaic approach that determines the revenue component of Black Hills Power’sour open access transmission tariff. The revenue requirement is based on an equity return of 10.8%, a capital structure of 57% equity and 43% debt and a return on rate base which is adjusted annually.

Rate Matters

South Dakota

In January 2014, Black Hills Power filedOn March 2, 2015, the SDPUC issued an order approving a rate case with the WPSC requestingstipulation and agreement authorizing an annual electric revenue increase for us of $2.8 million to recover$6.9 million. The agreement was a Global Settlement and did not stipulate return on equity and capital structure. The SDPUC’s decision provides us a return on our investment in Cheyenne Prairie existingand associated infrastructure, and increasingprovides recovery of our share of operating costs. The filing seeks a returnexpenses for this natural gas fired facility. We implemented interim rates on equity of 10.25% and a capital structure of 53% equity and 47% debt.October 1, 2014, coinciding with Cheyenne Prairie’s commercial operation date. Final rates were approved on April 1, 2015, effective October 1, 2014.

In December 2012,Transmission

On July 23, 2015, we received approval from the WPSC for a CPCN originally filed on July 22, 2014 to construct the Wyoming portion of a rate case with$54 million, 230-kV, 144 mile-long transmission line that would connect the Teckla Substation in northeast Wyoming, to the Lange Substation near Rapid City, South Dakota. We received approval on November 6, 2014 from the SDPUC requesting an electric revenue increase of $13.7 million, or 9.94%, to recover investment in distribution and transmission lines, generation plant upgrades, environmental compliance and increased operating costs. On September 17, 2013, the SDPUC approvedfor a rate increase of $8.8 million, or 6.4%, effective June 16, 2013.

Power Plant Suspension/Retirements

In order to comply with environmental regulations, including the new EPA Industrial and Commercial Boiler Regulations for Area Sources of Hazardous Air Pollutants regulations, operations at our 25 MW coal-fired Ben French power plant were suspended as of August 31, 2012. Operations at our 35 MW coal-fired Osage power plant were suspended as of October 1, 2010. These plants as well as our 22 MW coal-fired plant Neil Simpson I will be retired on or before March 21, 2014. We intend to operate Neil Simpson I until the planned retirement date.

Cheyenne Prairie

As a result of the planned plant retirements for some of our older coal-fired power plants discussed above, Cheyenne Light and Black Hills Power filed a joint CPCNpermit to construct a new $222 million, 132 MW natural gas-fired electric generation facilitythe South Dakota portion of this line. Construction commenced in Cheyenne, Wyoming. The facility will include constructionthe first quarter of one simple-cycle, 37 MW combustion turbine that will be wholly owned by Cheyenne Light2016, and one combined cycle 95 MW unit that will be jointly owned by Cheyenne Light (40 MW) and Black Hills Power (55 MW). Thethe project is expected to be placed intoin service in the fourth quarter of 2014.2016.


In December 2012, we filed a request with the SDPUC to use a construction financing rider during the construction of Cheyenne Prairie in lieu of traditional AFUDC. This rider is similar to the one approved by the WPSC for Cheyenne Light and Black Hills Power for Wyoming customers in 2012. On January 17, 2013, the SDPUC approved a stipulation with interim rates effective April 1, 2013 and on Sept. 17, 2013, the SDPUC approved the construction financing rider. The rider allows Black Hills Power to earn and collect a rate of return during the construction period on its approximately 40% share of the total project cost that relates to South Dakota customers.
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State Regulation

Certain states where we conduct electric utility operations have adopted renewable energy portfolio standards that require or encourage us to source, by a certain future date, a minimum percentage of the electricity delivered to customers from renewable energy generation facilities. At December 31, 2013,2015, we were subject to the following renewable energy portfolio standards or objectives:

South Dakota. South Dakota has adopted a renewable portfolio objective that encourages, but does not mandate utilities to generate, or cause to be generated, at least 10% of their retail electricity supply from renewable energy sources by 2015.

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Montana. In 2005 Montana established a renewable portfolio standard that requires public utilities to obtain a percentage of their retail electricity sales from eligible renewable resources. In March 2013, we filed a petition with the MPSCMTPSC requesting a waiver of the renewable portfolio standards primarily due to exceeding the applicable “cost cap” included in the standards. However, in March 2013, the Montana Legislature adopted legislation that excluded Black Hills Powerus from all renewable portfolio standard requirements under Senate Bill 164, primarily due to the very low number of customers we have in Montana and the relatively high cost of meeting the renewable requirements.

Wyoming. Wyoming currently has no renewable energy portfolio standard.

Absent a specific renewable energy mandate in South Dakota, our current strategy is to prudently incorporate renewable energy into our resource supply, seeking to minimize associated rate increases for our utility customers. Mandatory portfolio standards have increased, and may continue to increase the power supply costs of our electric utility operations. Although we will seek to recover these higher costs in rates, we can provide no assurance that we will be able to secure full recovery of the costs we pay to be in compliance with standards or objectives. We cannot at this time reasonably forecast the potential costs associated with any new renewable energy standards that have been or may be proposed at the federal or state level.

Environmental Regulations

We are subject to numerous federal, state and local laws and regulations relating to the protection of the environment and the safety and health of personnel and the public. These laws and regulations affect a broad range of our utility activities, and generally regulate: (i) the protection of air and water quality; (ii) the identification, generation, storage, handling, transportation, disposal, record-keeping, labeling, reporting of, and emergency response in connection with hazardous and toxic materials and wastes, including asbestos; and (iii) the protection of plant and animal species and minimization of noise emissions. We have incurred, and expect to incur, capital, operating and maintenance costs for the operations of our plants to comply with these laws and regulations. While the requirements are evolving, it is virtually certain that environmental requirements placed on the operations will continue to be more restrictive.

In 2011, the EPA issued the Industrial and Commercial Boiler Regulations for Area Sources of Hazardous Air Pollutants, with updates on December 21, 2012, which impose emission limits, fuel requirements and monitoring requirements. The rule hashad a compliance deadline of March 21, 2014. In anticipation of this rule and our evaluation of costs to retrofit these plants, we suspended operations at the Osage plant on October 1, 2010 and as a result of this rule, we suspended operations at the Ben French facility on August 31, 2012 with plans to retire2012. We permanently retired Osage, Ben French Osage and Neil Simpson I on or before March 21, 2014.

On February 16, 2012, the EPA signedpublished in the Federal Register the National Emission Standards for Hazardous Air Pollutants from Coal and Oil Fired Electric Utility Steam Generating Units (MATS), which became effective on April 16, 2012. This rule imposes requirements for mercury, acid gases, metals and other pollutants. Affected units havehad a compliance deadline of April 16, 2015, with a pathway defined to apply for a one year extension due to certain very limited circumstances. The current state air permit for Wygen III provides mercury emission limits and monitoring requirements with which we are in compliance. Neil Simpson II and Wygen III have been utilized for internal study and review of mercury emission control technology and have mercury monitors in place. Due to mercury absorbent issues encountered in 2015, the state of Wyoming approved a one year compliance deadline extension to April 16, 2016 for Neil Simpson II and Wygen III, for mercury only. The other components of the MATS rule remain in effect and thethese plants are in compliance with those requirements. The Wyodak plant are expected to beis in compliance bywith all requirements of the compliance deadline, without incurring significant costs.MATS regulation.


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On June 3, 2010, the EPA promulgated the GHG Tailoring Rule, implementing regulations of GHG for permitting purposes. This rule will impact us in the event of a major modification at an existing facility or in the event we establish a new major source of GHG emissions, as defined by EPA regulations. Upon renewal of operating permits for existing permitted facilities, monitoring and reporting requirements will be implemented. New projects or major modificationsThis rule established the basis for EPA’s October 23, 2015 suite of GHG emission rules for existing, new, modified and reconstructed facilities. The portion of this rule-making that applies to existing projectspower generation sources is known as the Clean Power Plan (CPP). The portion of this rule-making that applies to new generating units effectively prohibits new coal-fired power plants from being constructed until carbon capture and sequestration becomes technically and economically feasible. The basis of the CPP regulation is to decrease existing coal-fired generation, increase the utilization of existing gas-fired combined cycle generation, increase renewable energy and increase use of DSM. States are required to develop and submit compliance plans to the EPA, with the initial submittal due by September 2016. The rule allows for a two year extension to submit a final plan and the states we operate in have indicated they will resultbe submitting the extension request. Also on October 23, 2015, EPA proposed a Federal Implementation Plan, which will be imposed on any state that fails to submit a plan or fails to include the required contents of the plan. That rule will contain the modeling standards for CPP compliance and will be an integral part of state plan development. On February 9, 2016, the U.S. Supreme Court entered an order staying the Clean Power Plan. The stay of the CPP will remain in place until the U.S. Supreme Court either denies a Best Available Control Technology review thatpetition for certiorari following the U.S. Court of Appeals’ decision on the substantive challenges to the CPP, if one is submitted, or until the U.S. Supreme Court enters judgment following grant of a petition for certiorari. The effect of the order is to delay the CPP’s compliance deadlines until challenges to the CPP have been fully litigated and the U.S. Supreme Court has ruled. We do not expect a final judicial decision on challenges to the CPP earlier than mid-2017. While we cannot predict the terms of state plans, any limits on CO2 emissions at our existing plants could result in more stringent emission control practiceshave a material impact on our customer rates, financial position, results of operations and/or cash flows. In 2015 we met with South Dakota and technologies. Wyoming regulatory agencies to discuss the rule implementation and potential compliance pathways.

Wyoming passed GHG legislation in 2012 and 2013, enabling the state to implement the EPA’s GHG program. Rules wereWyoming adopted and submitted a GHG regulatory program to the EPA, with approval grantedwhich the EPA approved and published in the November 22, 2013 Federal Register. As of December 23, 2013, Wyoming has full jurisdiction over the GHG permitting program which includes the transfer of the Cheyenne Prairie EPA GHG air permit, to the state of Wyoming. This eliminates the increased time, expense and considerable risk of obtaining a permit from the EPA.

On January 8,In 2015, we reported 2014 GHG emissions from our Power Generation facilities in order to comply with the EPA re-proposed StandardsEPA’s GHG Annual Inventory regulation, issued in 2009. We continue to report annual GHG emissions as required by the EPA. Climate change issues are the subject of Performance for Greenhouse Gas Emissions from New Stationary Sources: Electric Utility Generating Units.a number of lawsuits, the outcome of which could impact the utility industry. We expect multiple revisionswill continue to review GHG impacts as legislation or regulation develops and legal actions before the final rulelitigation is issued, so we cannot be certain of impacts from this rule.resolved.


10New or more stringent regulations or other energy efficiency requirements could require us to incur significant additional costs relating to, among other things, the installation of additional emission control equipment, the acceleration of capital expenditures, the purchase of additional emissions allowances or offsets, the acquisition or development of additional energy supply from renewable resources and the closure of certain generating facilities. To the extent our regulated fossil-fuel generating plants are included in rate base, we will attempt to recover costs associated with complying with emission standards or other requirements. We will also attempt to recover the emission compliance costs of our non-regulated fossil-fuel generating plants from utility customers and other purchasers of the power generated by our non-regulated power plants, including utility affiliates. Any unrecovered costs could have a material impact on our results of operations, financial position or cash flows. In addition, future changes in environmental regulations governing air emissions could render some of our power generating units more expensive or uneconomical to operate and maintain.



In August 2012, the EPA proposed revisions to the Electric Utility New Source Performance Standards for stationary combustion turbines. This rule is expected to be finalized in 20142016 and, as proposed, will be applicable to Cheyenne Prairie and eventually all the combustion turbines in our fleet. Among other things, the rule seeks to eliminate startup exemptions and clearly define overhauls for impact on the EPA’s New Source Review regulations, with the intention of eventually bringing all units under the applicability of this rule. The primary impact is expected to be on our older existing units, which will eventually be required to meet tighter NOx emission limitations.

By May 3, 2013, all of our diesel generator engines were required to comply with EPA’s Stationary Reciprocating Internal Combustion Engine Hazardous Air Pollutant regulations. Evaluations were completed, emission control equipment was installed and emission testing confirmed compliance with those requirements.


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In 2011, the State of Wyoming issued a letter requiring Neil Simpson II to include startup and shutdown SO2 and NOx emissions when evaluating compliance with permitted emission limits. This represented a significant change from requirements in the original 1993 air permit. Minor engineered design changes were made to improve scrubber performance during startup. Those changes enabled the unit to meet the new requirements. The unit was previously fitted with state of the art low NOx burners that support compliance with this new requirement. Also in 2014, Neil Simpson II will be convertingand Wygen III have converted startup fuel from diesel to natural gas.gas to support potential start-up requirements and future GHG state compliance plans.

Regulatory Accounting

We follow accounting for regulated utility operations and our financial statements reflect the effects of the different rate making principles followed by the various jurisdictions in which we operate. If rate recovery becomes unlikely or uncertain, due to competition or regulatory action, these accounting standards may no longer apply to our regulated operations. In the event we determine that we no longer meet the accounting criteria for regulated operations, the accounting impact to us could be an extraordinary non-cash charge to operations of an amount that could be material.

New Accounting Pronouncements

See Note 1 of our Notes to Financial Statements in this Annual Report on Form 10-K for information on new accounting standards adopted in 20132015 or pending adoption.


ITEM 1A.    RISK FACTORS

The nature of our business subjects us to a number of uncertainties and risks. The following risk factors and other risk factors that we discuss in our periodic reports filed with the SEC should be considered for a better understanding of our Company. These important factors and other matters discussed herein could cause our actual results or outcomes to differ materially from those discussed in our forward-looking statements, or otherwise.

Regulatory commissions may refuse to approve some or all of the utility rate increases we have requested or may request in the future, or may determine that amounts passed through to customers were not prudently incurred and therefore are not recoverable, which could adversely affect our results of operations, financial position or liquidity.

Our electricity operations are subject to cost-of-service regulation and earnings oversight.oversight from federal and state utility commissions. This regulatory treatment does not provide any assurance as to achievement of desired earnings levels. Our rates are regulated on a state-by-state basis by the relevant state regulatory authorities based on an analysis of our costs, as reviewed and approved in a regulatory proceeding. The rates that we are allowed to charge may or may not match our related costs and allowed return on invested capital at any given time. Our returns could be threatened by plant outages, machinery failures, increased purchased power costs, acts of nature, acts of terrorism or other unexpected events over which we have no control that could cause our costs to increase and operating margins to decline. While rate regulation is premised on the full recovery of prudently incurred costs and a reasonable rate of return on invested capital, there can be no assurance that the state public utility commissions will judge all of our costs, including our borrowing and debt service costs, to have been prudently incurred or that the regulatory process in which rates are determined will always result in rates that will produce a full recovery of our costs and the return on invested capital allowed by the applicable state public utility commission.


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To some degree, we are permitted to recover certain costs (such as increased fuel, purchased power and transmission costs, as applicable) without having to file a rate case. To the extent we are able to pass through such costs to customers and a state public utility commission subsequently determines that such costs should not have been paid by customers, we may be required to refund such costs to customers. Any such costs not recovered through rates, or any such refund, could negativelyadversely affect our results of operations, financial position or cash flows.


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Our financial performance depends on the successful operations of our facilities. If the risks involved in our operations are not appropriately managed or mitigated, our operations may not be successful and this could adversely affect our results of operations.

Operating electric generating facilities involves risks, including:

Operational limitations imposed by environmental and other regulatory requirements;

Interruptions to supply of fuel and other commodities used in generation and distribution. We purchase fuel from a number of suppliers. Our results of operations could be negatively impacted by disruptions in the delivery of fuel due to various factors, including but not limited to, transportation delays, labor relations, weather, and environmental regulations, which could limit the ability to operate our facilities;

Breakdown or failure of equipment or processes, including those operated by PacifiCorp at the Wyodak plant;

Inability to recruit and retain skilled technical labor;

Disrupted transmission and distribution. We depend on transmission and distribution facilities, including those operated by unaffiliated parties, to deliver the electricity that we sell to our retail and wholesale customers. If transmission is interrupted, our ability to sell or deliver product and satisfy our contractual obligations may be hindered;

Electricity is dangerous for employees and the general public should they come in contact with power lines or electrical equipment. Natural conditions and other disasters such as wind, lightning and winter storms can cause wildfires, pole failures and associated property damage and outages. For example, as described in more detail under “Legal Proceedings,” a fire investigator concluded that a forest and grassland fire in the western Black Hills of Wyoming and South Dakota in 2012 was caused by the failure of a transmission structure owned, operated and maintained by us, and claims have been made against us related to the fire;outages;

Disruption in the functioning of our information technology and network infrastructure which are vulnerable to disability, failures and unauthorized access. If our information technology systems were to fail and we were unable to recover in a timely manner, we would be unable to fulfill critical business functions; and

Labor relations.

National and regional economic conditions may cause increased counter-party risk, late payments and uncollectible accounts, which could adversely affect our results of operations, financial position or liquidity.

A future recession may lead to an increase in late payments from retail, commercial and industrial utility customers, as well as from our non-regulated customers. If late payments and uncollectible accounts increase, our results of operations, financial position and liquidity could be adversely impacted.

Our credit ratings could be lowered below investment grade in the future. If this were to occur, it could impact our access to capital, our cost of capital and our other operating costs.

Our credit rating on our First Mortgage Bonds is A1 by Moody’s, A- by S&P and A-A by Fitch. Any reduction in our credit ratings by the rating agencies could adversely affect our ability to refinance our existing debt and to complete new financings.financings on reasonable terms or at all. In addition, a downgrade in our credit rating would increase our costs of borrowing under some of our existing debt obligations. A downgrade could also result in our business counterparties requiring us to provide additional amounts of collateral under new transactions.


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Construction, expansion, refurbishment and operation of power generating and transmission facilities involve significant risks which could reduce profitability.

The construction, expansion, refurbishment and operation of power generating and transmission facilities involve many risks, including:

The inability to obtain required governmental permits and approvals along with the cost of complying with or satisfying conditions imposed upon such approvals;

Contract restrictions upon the timing of scheduled outages;

Cost of supplying or securing replacement power during scheduled and unscheduled outages;

The unavailability or increased cost of equipment;

The cost of recruiting and retaining or the unavailability of skilled labor;

Supply interruptions, work stoppages and labor disputes;

Increased capital and operating costs to comply with increasingly stringent environmental laws and regulations;

Opposition by members of the public or special-interest groups;

Weather interferences;

Unexpected engineering, environmental or geological problems; and

Unanticipated cost overruns.

The ongoing operation of our facilities involves many of the risks described above, in addition to risks relating to the breakdown or failure of equipment or processes and performance below expected levels of output or efficiency. New plants may employ recently developed and technologically complex equipment, especially in the case ofincluding newer environmental emission control technology. Any of these risks could cause us to operate below expected capacity levels, which in turn could reduce revenues, increase expenses, or cause us to incur higher maintenance costs and penalties. While we maintain insurance, obtain warranties from vendors and obligate contractors to meet certain performance levels, the proceeds of such insurance and our rights under warranties or performance guarantees may not be timely or adequate to cover lost revenues, increased expenses, liability or liquidated damage payments.

Prices for some of our products and services as well as a portion of our operating costs are volatile and may cause our revenues and expenses to fluctuate significantly.

A portion of the variability of our net income in recent years has beenis attributable to sales of contract and off-system wholesale electricity sales.electricity. The related power prices are influenced by many factors outside our control, including among other things, fuel prices, transmission constraints, supply and demand, weather, general economic conditions and the rules, regulations and actions of the system operators in those markets. Moreover, unlike most other commodities, electricity cannot be stored and therefore must be produced concurrently with its use. As a result, wholesale power markets are subject to significant, unpredictable price fluctuations over relatively short periods of time.


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Our energy production, transmission and distribution activities involve numerous risks that may result in accidents and other catastrophic events. These events could disrupt or impair our operations, create additional costs and cause substantial loss to us.

Inherent in our electricity transmission and distribution activities are a variety of hazards and operating risks, such as fires, releases of hazardous materials, explosions and mechanical problems that could cause substantial adverse financial impacts. These events could result in injury or loss of human life, significant damage to property or natural resources (including public parks), environmental pollution, impairment of our operations, and substantial losses to us. In accordance with customary industry practice, we maintain insurance against some, but not all, of these risks and losses. The occurrence of any of these events not fully covered by insurance could have a material adverse effect on our financial position and results of operations. Particularly for our transmission and distribution lines located near populated areas, including residential areas, commercial business centers, industrial sites and other public gathering areas, the damages resulting from any such events could be significant.

Our operating results can be adversely affected by variations from normal weather patterns.

Our utility business is a seasonal business and weather patterns can have a material impact on our operating performance. Demand for electricity is typically greater in the summer and winter months associated with cooling and heating. Accordingly, our utility operations have historically generated lesslower revenues and income when weather conditions are cooler than normal in the summer and warmer than normal in the winter. Unusually mild summers and winters therefore could have an adverse effect on our financial condition and results of operations, financial position and liquidity.operations.

Our businesses are located in areas that could be subject to seasonal natural disasters such as severe snow and ice storms, flooding and wildfires. These factors could result in interruption of our business, damage to our property such as power lines and substations, and repair and clean-up costs associated with these storms. We may not be able to recover the costs incurred in restoring transmission and distribution property following these natural disasters through a change in our regulated rates thereby resulting in a negative impact on our results of operations, financial condition and cash flows.

The failure to achieve or maintain compliance with existing or future governmental laws, regulations or requirements could adversely affect our results of operations, financial position or liquidity. Additionally, the potentially high cost of complying with such requirements or addressing environmental liabilities could also adversely affect our results of operations, financial position or liquidity.

Our business is subject to extensive energy, environmental and other laws and regulations of federal, state and local authorities. We generally must obtain and comply with a variety of regulations, licenses, permits and other approvals in order to operate, which could require significant capital expenditures and operating costs. If we fail to comply with these requirements, we could be subject to civil or criminal liability and the imposition of penalties, liens or fines; claims for property damage or personal injury; and/ or environmental clean-up costs. In addition, existing regulations may be revised or reinterpreted, new laws and regulations may be adopted or become applicable to us or our facilities, which could require additional unexpected expenditures or cause us to reevaluate the feasibility of continued operations at certain sites and have a detrimental effect on our business.

Future steps to bring our facilities into compliance, if necessary, could be expensive, and could adversely affect our results of operation and financial condition. We expect our environmental compliance expenditures to be substantial in the future due to the continuing trends toward stricter standards, greater regulation, more extensive permitting requirements and an increase in the number of assets we operate.

Our ability to obtain insurance and the terms of any available insurance coverage could be adversely affected by international, national, state or local events and company-specific events, as well as the financial condition of insurers. Our insurance coverage may not provide protection against all significant losses.

Our ability to obtain insurance, as well as the cost of coverage of such insurance, could be affected by developments affecting company-specific events,insurance businesses, international, national, state or local events and company-specific events, as well as the financial condition of insurers. Insurance coverage may not continue to be available at all, or at rates or on terms similar to those presently available to us. A loss for which we are not fully insured could materially and adversely affect our financial results. Our insurance may not be sufficient or effective under all circumstances and against all hazards or liabilities to which the companywe may be subject, including but not limited to environmental hazards, wildfire-relatedfire-related liability from natural events, distribution property losses and cyber security risks.


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Municipal governments may seek to limit or deny franchise privileges which could inhibit our ability to secure adequate recovery of our investment in assets subject to condemnation.

Municipal governments within our utility service territories possess the power of condemnation, and could seek a municipal utility within a portion of our current service territories by limiting or denying franchise privileges for our operations, and exercising powers of condemnation over all or part of our utility assets within municipal boundaries. Although condemnation is a process that is subject to constitutional protections requiring just compensation, as with any judicial procedure, the outcome is uncertain. If a municipality sought to pursue this course of action, we cannot assure that we would secure adequate recovery of our investment in assets subject to condemnation.

Federal and state laws concerning greenhouse gas regulations and air emissions may materially increase our generation and production costs and could render some of our generating units uneconomical to operate and maintain.
We own and operate regulated fossil-fuel generating plants in South Dakota and Wyoming. Recent developments under federal and state laws and regulations governing air emissions from fossil-fuel generating plants will likely result in more stringent emission limitations, which could have a material impact on our costs of operations. Various pending or final state and EPA regulations that will impact our facilities are also discussed in Item 1 of this Annual Report on Form 10-K under the caption “Environmental Regulations.”
On May 20, 2011, with amendments on December 21, 2012, the EPA’s Industrial and Commercial Boiler regulations became effective, which provide for hazardous air pollutant-related emission limits and monitoring requirements. The compliance deadline for this rule is March 21, 2014. Engineering evaluations have been completed and confirm the significant impact on our Neil Simpson I, Osage and Ben French facilities. These units will be retired on or before the March 21, 2014 compliance deadline. Although we will seek recovery for the remaining net book values of these plants and prudent decommissioning costs of these units, we cannot be assured of this recovery.

On February 16, 2012, the EPA published in the Federal Register the National Emission Standards for Hazardous Air Pollutants from Coal and Oil Fired Electric Utility Steam Generating Units (MATS),MATS, with an effective date of April 16, 2012. Affected units havehad a compliance deadline of April 16, 2015, with a pathway defined to apply for a one year extension due to certain circumstances. It is expected that all of our plants will be in compliance by the initial 2015 deadline,We applied for and received a one year extension for mercury only, with the primary impacts to Neilremaining aspects of the MATS rule remaining in effect. All our impacted plants (Neil Simpson II, Wygen III and the Wyodak Plant including installation of mercury sorbent injection systems, alongPlant) are in compliance with additional monitoring and testing requirements.the applicable rule provisions.
The GHG Tailoring Rule, implementing regulations of GHG for permitting purposes, became effective in June 2010. This rule will impact us in the event of a major modification at an existing facility or in the event of a new major source as defined by EPA regulations. Upon renewal of operating permits for existing facilities monitoring and reporting requirements will be implemented. New projects or major modifications to existing projects will result in a Best Available Control Technology review that could impose more stringent emissions control practices and technologies. The EPA’s GHG New Source Performance Standard for new steam electric generating units was re-proposed in September 2013 and is expected to be final in the spring of 2014. As proposed, itpublished October 23, 2015. The rule effectively prohibits new coal fired units until carbon capture and sequestration becomes technically and economically feasible. It also effectively prohibits simple cycle natural gas combustion turbines from generating more than one-third of their capacity, averaged over a three year period. In 2014, we expect
On October 23, 2015, the EPA finalized the Clean Power Plan to propose regulations for GHGcut carbon emissions from existing steam electric generating units. The design of the Clean Power Plan is to decrease existing coal-fired generation, and increase the utilization of existing gas generation, increase renewable energy, and DSM. This rule could have a significant impact on our coal and natural gas generating fleet. The rule calls for states to develop plans to meet their assigned emission rate targets by 2030. The rule also allows states to formulate a regional approach whereby they would join with other states and be assigned a new single target for the group. On February 9, 2016, the U.S. Supreme Court entered an order staying the Clean Power Plan. The stay of the CPP will remain in place until the U.S. Supreme Court either denies a petition for certiorari following the U.S. Court of Appeals’ decision on the substantive challenges to the CPP, if one is submitted, or until the U.S. Supreme Court enters judgment following grant of a petition for certiorari. The effect of the order is to delay the CPP’s compliance deadlines until challenges to the CPP have been fully litigated and the U.S. Supreme Court has ruled. We do not expect a final judicial decision on challenges to the CPP earlier than mid-2017. While we cannot predict the terms of state plans, any limits on CO2 emissions at our existing plants could have a material impact on our customer rates, financial position, results of operations and/or cash flows. In 2015, we met with state air programs and public utility commissions on several occasions. We will continue to work closely with state regulatory staff as these plans develop.
Due to uncertainty as to the final outcome of federal climate change legislation, legal challenges, state clean power plan developments or regulatory changes under the Clean Air Act, we cannot definitively estimate the effect of GHG legislation or regulation on our results of operations, cash flows or financial position. The impact of GHG legislation or regulation on our company will depend upon many factors, including but not limited to, the timing of implementation, state clean power plan requirements, the GHG sources that are regulated, the overall GHG emissions cap level and the availability of technologies to control or reduce GHG emissions. If a “cap and trade”an allowance or credit trading structure is implemented, the impact will depend on the degree to which offsets are allowed, the allocation of emission allowances to specific sources, the costs of those allowances or credits and the effect of carbon regulation on natural gas and coal prices.

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New or more stringent regulations or other energy efficiency requirements could require us to incur significant additional costs relating to, among other things, the installation of additional emission control equipment, the acceleration of capital expenditures, the purchase of additional emissions allowances or offsets, the acquisition or development of additional energy supply from renewable resources, and the closure or reduction of certainload of coal generating facilities.facilities and potential increased load of our combined cycle natural gas fired units. To the extent our regulated fossil-fuel generating plants are included in rate base we will attempt to recover costs associated with complying with emission standards or other requirements. Any unrecovered costs could have a material impact on our results of operations and financial condition. In addition, future changes in environmental regulations governing air emissions could render some of our power generating units more expensive or uneconomical to operate and maintain.
Increased risks of regulatory penalties could negatively impact our results of operations, financial position or liquidity.

Business activities in the energy sector are heavily regulated, primarily by agencies of the federal government. Agencies that historically sought voluntary compliance, or issued non-monetary sanctions, now employ mandatory civil penalty structures for regulatory violations. The FERC, EPA, OSHA and SEC can increasinglymay impose significant and sometimes punitive civil and criminal penalties to enforce compliance requirements relative to our business. In addition, FERC has delegated certain aspects of authority for enforcement of electric system reliability standards to the North American Energy Reliability Corporation,NERC, with similar penalty authority for violations. If a serious regulatory violation did occur, and penalties were imposed by FERC or another federal agency, this action could have a material adverse effect on our operations and/or our financial results.

Certain Federal laws, including the Migratory Bird Act and the Endangered Species Act, provide special protection to certain designated species. These laws and any state equivalents provide for significant civil and criminal penalties for non-permitted activities that result in harm to or harassment of certain protected animals, including damage to their habitats. If such species are located in an area in which we conduct operations, or if additional species in those areas become subject to protection, our operations and development projects, particularly transmission, generation and wind, could be restricted or delayed, or we could be required to implement expensive mitigation measures.

An effective system of internal control may not be maintained, leading to material weaknesses in internal control over financial reporting.

Section 404 of the Sarbanes-Oxley Act of 2002 requires management to make an assessment of the design and effectiveness of internal controls. During their assessment of these controls, management or our independent registered public accounting firm may identify areas of weakness in control design or effectiveness, which may lead to the conclusion that a material weakness in internal control exists. Any control deficiencies we identify in the future could adversely affect our ability to report our financial results on a timely and accurate basis, which could result in a loss of investor confidence in our financial reports or have a material adverse effect on our ability to operate our business or access sources of liquidity.

Threats of terrorism and catastrophic events that could result from terrorism, cyber-attacks, or individuals and/or groups attempting to disrupt our business,businesses, or the businesses of third parties, may impact our operations in unpredictable ways and could adversely affect our results of operations, financial position orand liquidity.

We are subject to the potentially adverse operating and financial effects of terrorist acts and threats, as well as cyber-attacks and other disruptive activities of individuals or groups. Our generation, transmission and distribution facilities, fuel storage facilities, information technology systems and other infrastructure facilities and systems and physical assets, could be direct targets of, or indirectly affected by, such activities. Terrorist acts or other similar events could harm our businessbusinesses by limiting ourtheir ability to generate, purchase or transmit power and by delaying ourtheir development and construction of new generating facilities and capital improvements to existing facilities. These events, and governmental actions in response, could result in a material decrease in revenues and significant additional costs to repair and insure our assets, and could adversely affect our operations by contributing to disruption of supplies and markets for natural gas, oil and other fuels. They could also impair our ability to raise capital by contributing to financial instability and lower economic activity.

We operate in a highly regulated industry that requires the continued operation of sophisticated information technology systems and network infrastructure. Despite our implementation of security measures, all of our technology systems are vulnerable to disability, failures or unauthorized access, including cyber-attacks. If our technology systems were to fail or be breached and be unable to recover in a timely way, we would be unable to fulfill critical business functions, and sensitive confidential and other data could be compromised, which could have material adverse effect not only on our financial results but on our public reputation as well.


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The implementation of security guidelines and measures and maintenance of insurance, to the extent available, addressing such activities could increase costs. These types of events could materially adversely affect our financial results. In addition, these types of events could require significant management attention and resources, and could adversely affect our reputation among customers and the public.


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A disruption of the regional electric transmission grid, natural gas pipeline infrastructure or other fuel sources, could negatively impact our business. Because generation, transmission systems and natural gas pipelines are part of an interconnected system, we face the risk of possible loss of business due to a disruption caused by the impact of an event on the interconnected system (such as severe weather or a generator or transmission facility outage, pipeline rupture, or a sudden significant increase or decrease in wind generation), within our system or within a neighboring system. Any such disruption could have a material impact on our financial results.

A cyber attack may disrupt our operations, lead to a loss or misuse of confidential and proprietary information and create a potential liability.

We operate in a highly regulated industry that requires the continuous use and operation of sophisticated information technology systems and network infrastructure. In addition, in the ordinary course of business, we collect and retain sensitive information including personal information about our customers and employees. Cyber attacks targeting our electronic control systems used at our generating facilities and for electric and gas distribution systems, could result in a full or partial disruption of our electric operations. Cyber attacks targeting other key information technology systems could further add to a full or partial disruption to our operations. Any disruption of these operations could result in a loss of service to customers and a significant decrease in revenues, as well as significant expense to repair system damage and remedy security breaches. Any theft, loss and/or fraudulent use of customer, shareowner, employee or proprietary data as a result of a cyber attack could subject us to significant litigation, liability and costs, as well as adversely impact our reputation with customers and regulators, among others.

We have instituted security measures and safeguards to protect our operational systems and information technology assets. FERC, through the North American Electric Reliability Corporation, requires certain safeguards be implemented to deter cyber attacks. The security measures and safeguards we have implemented may not always be effective due to the evolving nature and sophistication of cyber attacks. Despite our implementation of security measures and safeguards, all of our information technology systems are vulnerable to disability, failures or unauthorized access, including cyber-attacks. If our information technology systems were to fail or be breached by a cyber attack or a computer virus, and be unable to be recovered in a timely way, we would be unable to fulfill critical business functions, and sensitive confidential and other data could be compromised, which could have a material adverse effect not only on our financial results, but on our public reputation as well.

Market performance or changes in other assumptions could require us to make significant unplanned contributions to our pension plans and other postretirement benefit plans. Increasing costs associated with our defined benefit retirement plans may adversely affect our results of operations, financial position or liquidity.

We have a defined benefit pension plan that covers a substantial portion of our employees. Assumptions related to future costs, return on investments, interest rates and other actuarial assumptions have a significant impact on our funding requirements and the expense recognized related to these plans. These estimates and assumptions may change based on actual return on plan assets, changes in interest rates and changes in governmental regulations.

Increasing costs associated with our health care plans and other benefits may adversely affect our results of operations, financial position or liquidity.

The costs of providing health care benefits to our employees and retirees have increased substantially in recent years. We believe that our employee benefit costs, including costs related to health care plans for our employees and former employees, will continue to rise. The increasing costs and funding requirements associated with our health care plans may adversely affect our results of operations, financial position or liquidity.

In March 2010, the President of the United States signed the Patient Protection and Affordable Care Act of 2010 as amended by the Health Care and Education Reconciliation Act of 2010 (collectively the “2010 Acts”). The 2010 Acts will have a substantial impact on health care providers, insurers, employers and individuals. The 2010 Acts will impact employers and businesses differently depending on the size of the organization and the specific impacts on a company’s employees. Certain provisions of the 2010 Acts are effective while other provisions of the 2010 Acts will be effective in future years. The 2010 Acts could require, among other things, changes to our current employee benefit plans and in our administrative and accounting processes as well as changes to the costs of our plans. The ultimate extent and cost of these changes cannot be determined at this time and are being evaluated and updated as related regulations and interpretations of the 2010 Acts become available.


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Our electric utility rates are regulated on a state-by-state basis by the relevant state regulatory authorities based on an analysis of our costs, as reviewed and approved in a regulatory proceeding. Within our utility rates we have generally recovered the cost of providing employee benefits. As benefit costs continue to rise, there can be no assurance that the state public utility commissions will allow recovery.


ITEM 1B.    UNRESOLVED STAFF COMMENTS

None.


ITEM 3.LEGAL PROCEEDINGS

Information regarding our legal proceedings is incorporated herein by reference to the “Legal Proceedings” sub caption within Item 8, Note 11, “Commitments and Contingencies,” of our Notes to Financial Statements in this Annual Report on Form 10-K.


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PART II

ITEM 5.MARKET FOR REGISTRANT’S COMMON EQUITY AND RELATED STOCKHOLDER
MATTERS

All of our common stock is held by our parent company, Black Hills Corporation. Accordingly, there is no established trading market for our common stock.


ITEM 7.MANAGEMENT’S DISCUSSION AND ANALYSIS OF RESULTS OF OPERATIONS

Non-GAAP Financial Measure

The following discussion includes financial information prepared in accordance with GAAP, as well as another financial measure, gross margin, that is considered a “non-GAAP financial measure.” Generally, a non-GAAP financial measure is a numerical measure of a company’s financial performance, financial position or cash flows that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP. Gross margin (revenue less cost of sales) is a non-GAAP financial measure due to the exclusion of depreciation from the measure. The presentation of gross margin is intended to supplement investors’ understanding of our operating performance.

In our Management’s Discussion and Analysis of Results of Operations, Grossgross margin is calculated as operating revenue less cost of fuel and purchased power. Our gross margin is impacted by the fluctuations in power purchases and natural gas and other fuel supply costs. However, while these fluctuating costs impact gross margin as a percentage of revenue, they only impact total gross margin if the costs cannot be passed through to our customers.

Our gross margin measure may not be comparable to other companies’ gross margin measure. Furthermore, this measure is not intended to replace operating income as determined in accordance with GAAP as an indicator of operating performance.

For the years ended December 31,2013Variance2012Variance20112015Variance2014Variance2013
(in thousands)(in thousands)
Revenue$254,027
$10,718
$243,309
$(2,322)$245,631
$277,864
$9,376
$268,488
$14,461
$254,027
Fuel and purchased power89,437
1,918
87,519
(5,703)93,222
83,339
(10,637)93,976
4,539
89,437
Gross margin164,590
8,800
155,790
3,381
152,409
194,525
20,013
174,512
9,922
164,590
  
Operating expenses102,246
4,037
98,209
(248)98,457
106,611
1,213
105,398
3,152
102,246
Gain on sale of operating assets


768
(768)
Operating income62,344
4,763
57,581
2,861
54,720
87,914
18,800
69,114
6,770
62,344
  
Interest expense, net(19,291)(2,226)(17,065)(926)(16,139)(21,174)(1,472)(19,702)(411)(19,291)
Other income539
(340)879
373
506
1,034
372
662
123
539
Income tax expense(13,419)890
(14,309)(2,319)(11,990)(22,600)(6,088)(16,512)(3,093)(13,419)
Net income$30,173
$3,087
$27,086
$(11)$27,097
$45,174
$11,612
$33,562
$3,389
$30,173


18



The following tables provide certain electric utility operating statistics for the years ended December 31 (dollars in thousands):
Revenue
Customer Base2013Percentage Change2012Percentage Change20112015Percentage Change2014Percentage Change2013
Residential$64,566
10 %$58,523
(2)%$59,826
$72,659
4 %$69,712
8 %$64,566
Commercial80,289
9 %73,858
1 %72,889
100,511
9 %91,882
14 %80,289
Industrial27,705
8 %25,656
 %25,723
33,336
17 %28,451
3 %27,705
Municipal3,421
5 %3,268
3 %3,172
3,626
6 %3,409
 %3,421
Total retail sales175,981
9 %161,305
 %161,610
210,132
9 %193,454
10 %175,981
Contract wholesale21,956
8 %20,290
12 %18,105
17,537
(17)%21,206
(3)%21,956
Wholesale off-system29,580
(7)%31,905
(9)%34,889
23,241
(17)%28,002
(5)%29,580
Total electric sales227,517
7 %213,500
(1)%214,604
250,910
3 %242,662
7 %227,517
Other revenue26,510
(11)%29,809
(4)%31,027
26,954
4 %25,826
(3)%26,510
Total revenue$254,027
4 %$243,309
(1)%$245,631
$277,864
3 %$268,488
6 %$254,027

Megawatt-Hours Sold
MWh SoldMWh Sold
Customer Base2013Percentage Change2012Percentage Change20112015Percentage Change2014Percentage Change2013
Residential555,204
4 %532,342
(3)%550,935
521,828
(4)%542,008
(2)%555,204
Commercial730,701
 %731,785
1 %720,978
792,466
1 %782,238
7 %730,701
Industrial404,009
(1)%407,301
 %408,337
429,140
7 %399,648
(1)%404,009
Municipal34,344
(4)%35,933
5 %34,235
31,924
 %32,076
(7)%34,344
Total retail sales1,724,258
1 %1,707,361
 %1,714,485
1,775,358
1 %1,755,970
2 %1,724,258
Contract wholesale357,193
5 %340,036
(3)%349,520
260,893
(23)%340,871
(5)%357,193
Wholesale off-system1,002,847
(21)%1,263,457
3 %1,226,548
837,120
4 %808,257
(19)%1,002,847
Total electric sales3,084,298
(7)%3,310,854
1 %3,290,553
2,873,371
(1)%2,905,098
(6)%3,084,298
Losses and company use158,845
(20)%197,355
22 %162,316
167,332
(6)%177,577
12 %158,845
Total energy3,243,143
(8)%3,508,209
2 %3,452,869
3,040,703
(1)%3,082,675
(5)%3,243,143

We own approximately 471445 MW of electric utility generating capacity and purchase an additional 50 MW under a long-term agreement expiring in 2023. On March 21, 2014, we retired the Ben French, Neil Simpson I, and Osage coal-fired power plants. These three plants totaling 81 MW were closed because of federal environmental regulations. On October 1, 2014, we transferred the remaining net book value of these retired plants to a regulatory asset in accordance with an order granted by the SDPUC. These plants are primarily replaced by our share of Cheyenne Prairie.

Regulated Power Plant Fleet Availability20132012201120152014 2013
Coal-fired plants(a)
96.3%91.9%88.8%91.1%91.8% 96.3%
Other plants96.8%98.5%95.8%96.0%91.5%
(a) 
96.8%
Total availability96.5%94.5%91.5%93.9%91.6% 96.5%
______________________________________________________
(a)2011 reflects a planned major outage at2014 decrease from 2013 was due to the PacifiCorp-operated Wyodak plant.scheduling of outages in 2014 compared to 2013.

Resources2013Percentage Change2012Percentage Change2011
MWh generated:     
Coal1,768,483
(2)%1,796,936
5 %1,717,008
Gas33,374
1 %33,183
118 %15,221
 1,801,857
(2)%1,830,119
6 %1,732,229
      
MWh purchased1,441,286
(14)%1,678,090
(2)%1,720,640
Total resources3,243,143
(8)%3,508,209
2 %3,452,869

19



Resources2015Percentage Change2014Percentage Change2013
MWh generated:     
Coal1,537,744
(3)%1,591,061
(10)%1,768,483
Gas80,944
80 %44,984
35 %33,374
 1,618,688
(1)%1,636,045
(9)%1,801,857
      
MWh purchased1,422,015
(2)%1,446,630
 %1,441,286
Total resources3,040,703
(1)%3,082,675
(5)%3,243,143

Heating and Cooling Degree Days201320122011201520142013
Actual  
Heating degree days7,582
6,206
7,579
6,521
7,373
7,582
Cooling degree days724
937
700
577
481
724
  
Variance from 30-year average  
Heating degree days9%(13)%5%(8)%4 %9%
Cooling degree days8%47 %17%(14)%(28)%8%

20132015 Compared to 2012
2014

Gross margin increased primarily due to a return on additionalcapital investments in Cheyenne Prairie which increased base electricgross margins by $5.5$11.9 million and increased energy cost recoveries by $2.7 million. Retail margins increased $4.7 million primarily due to commercial and industrial load increases from higher MWh sold. These increases are partially offset by an approximately $1.7 million decrease in residential margins driven primarily by a 12% decrease in heating degree days compared to the Cheyenne Prairie construction financing rider.same period in the prior year.

Operations and maintenance increased reflecting an increase in depreciation expense primarily due to an increase in vegetation management,a higher asset base and amortization of regulatory plant overhaul and maintenance costs, and employee compensation and benefitdecommissioning costs.

Interest expense, net increased primarily due to lower interest income received on affiliate borrowings and increased allocationscosts from the $85 million of corporate debt costs.permanent financing put in place during the fourth quarter of 2014 for Cheyenne Prairie.

Other income, net was comparable to the prior year.

Income tax expense: The 2015 effective tax rate decreased in 2013 primarily dueis comparable to the result of the retroactive reinstatement of research and development credits.prior year.

20122014 Compared to 2011
2013

Gross margin increased primarily due to an increase of $1.6a return on additional investments which increased base electric margins by $6.0 million and $1.8 million from the Environmental Improvement Cost Recovery Adjustment rider, a $4.5 millionCheyenne Prairie construction financing rider. An increase in wholesalecommercial and transmissionindustrial MWh sold increased gross margins as a result of increased prices$2.3 million. These increases were partially offset by $2.5a $1.1 million from the 2012 expiration of a reserve capacity agreement with PacifiCorp.decrease in wholesale margins driven by plant outages affecting unit-contingent wholesale contracts.

Operations and maintenance were comparableincreased primarily due to an increase in depreciation, driven by an increased asset base, higher employee costs, property taxes, and a true-up made in the prior year. Increased corporate allocationsyear for generation dispatch services billed to a third party. These were partially offset by lower costs related to the suspension of operations at the Ben French plant.

Gain on sale of operating assetsa decrease in 2011 related to the sale of assets to a related party.vegetation management expenses.

Interest expense, netincreased primarily due to a decreasethe increase in interest incomelong-term debt from lower utility money pool borrowings.permanent financing put in place for Cheyenne Prairie by the sale of $85 million of first mortgage bonds on October 1, 2014.

Other income, net was comparable to the prior year.


20



Income tax expense: The effective tax rate increased primarilyis higher in 2014 due to an unfavorable true-up adjustmentsadjustment and lower flow throughthe recording of the tax benefit attributable2012 research and development credit in 2013.

Financing Plans and Activity

On October 1, 2014, in a private placement transaction to repairprovide permanent financing for Cheyenne Prairie, we issued
$85 million of 4.43% coupon first mortgage bonds due October 20, 2044. Proceeds from the bond sale also funded the September 30, 2014 early redemption of our 5.35% $12 million pollution control revenue bonds, originally due October 1, 2024. In addition, we paid the accrued interest on these bonds of $0.3 million.

Credit Ratings

Credit ratings impact our ability to obtain short and maintenance costs deducted for tax purposes.long-term financing, the cost of such financing, and vendor payment terms, including collateral requirements. The following table represents our credit rating from each agency’s review which were in effect at December 31, 2015:

Rating AgencyRating
S&PA-
Moody’sA1
FitchA

Significant Events

South DakotaRegulatory Matters

In December 2012,On July 23, 2015, we received approval from the WPSC for a CPCN originally filed on July 22, 2014 to construct the Wyoming portion of a rate case with$54 million, 230-kV, 144 mile-long transmission line that would connect the SDPUC requesting an electric revenue increase of $13.7 million, or 9.94%,Teckla Substation in northeast Wyoming, to recover investment in distribution and transmission lines, generation plant upgrades, environmental compliance and increased operating costs. On September 17, 2013, the SDPUC approved a rate increase of $8.8 million, or 6.4%, effective June 16, 2013.


20



Winter Storm

In October 2013, the City ofLange Substation near Rapid City, SD, experienced the second most severe blizzard in history which left most of our customers experiencing power outages. Repairing the substantial and widespread damage far exceeded average annual storm-related costs and in December 2013, we submitted an application toSouth Dakota. We received approval on November 6, 2014 from the SDPUC for approvala permit to deferconstruct the incremental costsSouth Dakota portion of approximately $2.5 million, including labor, materials and supplies, equipment and outside contractors that were incurredthis line. Construction commenced in the efforts to restore power to our customers. In January 2014, approval was receivedfirst quarter of 2016, and these costs are included in Regulatory assets until the next rate case filing.

Power Plant Suspension/Retirements

In order to comply with environmental regulations, including the new EPA Industrial and Commercial Boiler Regulations for Area Sources of Hazardous Air Pollutants regulations, operations at our 25 MW coal-fired Ben French power plant were suspended as of August 31, 2012. Operations at our 35 MW coal-fired Osage power plant were suspended as of October 1, 2010. These plants as well as our 22 MW coal-fired plant Neil Simpson I will be retired on or before March 21, 2014. We intend to operate Neil Simpson I until the planned retirement date.

Cheyenne Prairie

As a result of the planned plant retirements for some of our older coal-fired power plants discussed above, Cheyenne Light and Black Hills Power filed a joint CPCN to construct a new $222 million, 132 MW natural gas-fired electric generation facility in Cheyenne, Wyoming. The facility will include construction of one simple-cycle, 37 MW combustion turbine that will be wholly owned by Cheyenne Light and one combined cycle 95 MW unit that will be jointly owned by Cheyenne Light (40 MW) and Black Hills Power (55 MW). The project is expected to be placed intoin service in the fourth quarter of 2014.2016.

In December 2012, we filed a request withOn March 2, 2015, the SDPUC to useissued an order approving a construction financing rider during the constructionrate stipulation and agreement authorizing an annual electric revenue increase for us of $6.9 million. The agreement was a Global Settlement and did not stipulate return on equity and capital structure. The SDPUC’s decision provides us a return on our investment in Cheyenne Prairie in lieuand associated infrastructure, and provides recovery of traditional AFUDC. This rider is similar to the one approved by the WPSCour share of operating expenses for Cheyenne Light and Black Hills Power for Wyoming customers in 2012. On January 17, 2013, the SDPUC approved a stipulation withthis natural gas fired facility. We implemented interim rates effectiveon October 1, 2014, coinciding with Cheyenne Prairie’s commercial operation date. Final rates were approved on April 1, 2013 and on Sept. 17, 2013, the SDPUC approved the construction financing rider. The rider allows Black Hills Power to earn and collect a rate of return during the construction period on its approximately 40% share of the total project cost that relates to South Dakota customers.2015, effective October 1, 2014.

Critical Accounting Estimates

We prepare our financial statements in conformity with GAAP. In many cases, the accounting treatment of a particular transaction is specifically dictated by GAAP and does not require management’s judgment in application. There are also areas which require management’s judgment in selecting among available GAAP alternatives. We are required to make certain estimates, judgments and assumptions that we believe are reasonable based upon the information available. These estimates and assumptions affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the periods presented. Actual results may differ from our estimates and to the extent there are material differences between these estimates, judgments or assumptions and actual results, our financial statements will be affected. We believe the following accounting estimates are the most critical in understanding and evaluating our reported financial results.

The following discussion of our critical accounting estimates should be read in conjunction with Note 1, “Business Description and Summary of Significant Accounting Policies ”Policies” of our Notes to Financial Statements in this Annual Report on Form 10-K.


21



Pension and Other Postretirement Benefits

The Company, as described in Note 8 to the Financial Statements in this Annual Report on Form 10-K, has a defined benefit pension plan and post-retirement healthcare plan. As of December 31, 2012, a Master Trust was established for the investment of assets of the Plan and other Employer-sponsored retirementdefined benefit pension plans. Each participating retirement plan has an undivided interest in the Master Trust.


21



Accounting for pension and other postretirement benefit obligations involves numerous assumptions, the most significant of which relate to the discount rate for measuring the present value of future plan obligations; expected long-term rates of return on plan assets; rate of future increases in compensation levels; and healthcare cost projections. The determination of our obligation and expenses for pension and other postretirement benefits is dependent on the assumptions determined by management and used by actuaries in calculating the amounts. Although we believe our assumptions are appropriate, significant differences in our actual experience or significant changes in our assumptions may materially affect our pension and other postretirement obligations and our future expense.

The discount rate used to determine annual defined benefit pension costs accruals will be 5.1%4.25% in 20142016 and the discount rate used in 20132015 was 4.3%4.25%. In selecting the discount rate, we consider cash flow durations for each plan’s liabilities on high credit fixed income yield curves for comparable durations. We do not pre-fund our non-qualified plans or postretirement healthcare plans.

Beginning in 2016, the Company will change the method used to estimate the service and interest cost components of the net periodic pension, supplemental non-qualified defined benefit and other postretirement benefit costs. The new method uses the spot yield curve approach to estimate the service and interest costs by applying the specific spot rates along the yield curve used to determine the benefit obligations to relevant projected cash outflows. Prior to 2016, the service and interest costs were determined using a single weighted-average discount rate based on hypothetical AA Above Median yield curves used to measure the benefit obligation at the beginning of the period. The change does not affect the measurement of the total benefit obligations as the change in service and interest costs offsets the actuarial gains and losses recorded in other comprehensive income.
The Company changed to the new method to provide a more precise measure of interest and service costs by improving the correlation between the projected benefit cash flows and the discrete spot yield curve rates. The company will account for this change as a change in estimate prospectively beginning in the first quarter of 2016. The discount rates used to measure the 2016 service costs are 4.81%, 4.88% and 4.18% for pension, supplemental non-qualified defined benefit and other postretirement benefit costs, respectively. The discount rates used to measure the 2016 interest costs are 3.90%, 3.82% and 3.17% for pension, supplemental non-qualified defined benefit and other postretirement benefit costs, respectively. The previous method would have used a discount rate for both service and interest costs of 4.63% for pension, 4.50% for supplemental non-qualified defined benefit and 4.03% for other postretirement benefit costs. The decrease in the 2016 service and interest costs is approximately $0.5 million, $0.03 million and $0.1 million for the pension, supplemental non-qualified defined benefit and other postretirement benefit costs, respectively, as compared to the previous method.

Income Taxes

We file a federal income tax return with other members of the Parent consolidated group. For financial statement purposes, federal income taxes are allocated to the individual companies based on amounts calculated on a separate return basis.

We use the asset and liability method of accounting for income taxes. Under this method, deferred income taxes are recognized, at currently enacted income tax rates, to reflect the tax effect of temporary differences between the financial and tax basis of assets and liabilities, as well as net operating loss and tax credit carryforwards. Such temporary differences are the result of provisions in the income tax law that either require or permit certain items to be reported on the income tax return in a different period than they are reported in the financial statements. We have chosen to early adopt on a prospective basis ASU 2015-17. As of December 31, 2015, we classify all deferred tax assets and liabilities intoas non-current amounts. The prior period is presented under the previous guidance for classifying deferred tax assets and deferred tax liabilities as current and non-current amounts based on the nature of the related assets and liabilities.non-current.


22



In assessing the realization of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized and provides any necessary valuation allowances as required. If we determine that we will be unable to realize all or part of our deferred tax assets in the future, an adjustment to the deferred tax asset would be charged to income in the period such determination was made. Although we believe our assumptions, judgments and estimates are reasonable, changes in tax laws or our interpretations of tax laws and the resolution of current and any future tax audits could significantly impact the amounts provided for income taxes in our consolidated financial statements. With respect to changes in tax law, the American Taxpayer ReliefProtecting Americans from Tax Hikes Act of 2012,2015, which was enacted January 2, 2013,December 18, 2015, did not have a material impact on the amounts provided for income taxes including our ability to realize deferred tax assets. As expected, certainThe Tax Increase Prevention Act (TIPA), which was enacted December 19, 2014, did not have a material impact on the amounts provided for income taxes including our ability to realize deferred tax assets. Certain provisions of the ATRATIPA involving primarily the extension of 50%50 percent bonus depreciation resulted in minimal utilization of Federal net operating loss carryforwards. In fact, the 50% bonus depreciation was a contributing factor to the generation of a net operating lossNOL for Federalfederal income tax purposes in 2013.2014.

In addition, on September 13, 2013, the U.S. Treasury issued final regulations addressing the tax consequences associated with amounts paid to acquire, produce, or improve tangible property. The regulations havehad the effect of a change in law and as a result the impact should bewas taken into account in the period of adoption. In general, such regulations apply to tax years beginning on or after January 1, 2014, with early adoption permitted. We expect to implement most, if notimplemented all of the provisions of the final regulations with the filing of the 2013 federal income tax return in September 2014. Procedural guidance is expected from IRS in early 2014 to facilitate implementation. Analysis performed to date indicates noThe adoption of the final regulations did not have a material impact toon our financial statements.

See Note 6 in our Notes to Financial Statements in this Annual Report on Form 10-K for additional information.

Contingencies

When it is probable that an environmental or other legal liability has been incurred, a loss is recognized when the amount of the loss can be reasonably estimated. Estimates of the probability and the amount of loss are made based on currently available facts. Accounting for contingencies requires significant judgment regarding the estimated probabilities and ranges of exposure to potential liability. Our assessment of our exposure to contingencies could change to the extent there are additional future developments, or as more information becomes available. If actual obligations incurred are different from our estimates, the recognition of the actual amounts could have a material impact on our financial position, results of operations and cash flows. We describe any contingencies in Note 11 of the Financial Statements in this Annual Report on Form 10-K.


2223



ITEM 8.FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

INDEX TO FINANCIAL STATEMENTS



 Page
  
Management’s Report on Internal Controls Over Financial Reporting
  
Report of Independent Registered Public Accounting Firm
  
Statements of Income for the three years ended December 31, 20132015
  
Statements of Comprehensive Income (Loss) for the three years ended December 31, 20132015
  
Balance Sheets as of December 31, 20132015 and 20122014
  
Statements of Cash Flows for the three years ended December 31, 20132015
  
Statements of Common Stockholder’s Equity for the three years ended December 31, 20132015
  
Notes to Financial Statements


2324



Management’s Report on Internal Control over Financial Reporting

Management of Black Hills Power is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended. Our internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles.

All internal control systems, no matter how well designed, have inherent limitations. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Under the supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 20132015, based on the criteria set forth in Internal Control - Integrated Framework (1992)(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. This evaluation included review of the documentation of controls, evaluation of the design effectiveness of controls, testing of the operating effectiveness of controls and a conclusion on this evaluation. Based on our evaluation, we have concluded that our internal control over financial reporting was effective as of December 31, 20132015.

This annual report does not include an attestation report of our registered public accounting firm regarding internal control over financial reporting because this requirement is inapplicable to companies such as ours which are known as non-accelerated filers.

Black Hills Power


2425



REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholder of
Black Hills Power, Inc.
Rapid City, South Dakota

We have audited the accompanying balance sheets of Black Hills Power, Inc. (the “Company”) as of December 31, 20132015 and 20122014, and the related statements of income, comprehensive income (loss), common stockholder’s equity, and cash flows for each of the three years in the period ended December 31, 20132015. Our audits also included the financial statement schedule listed in the Index at Item 15. These financial statements and financial statement schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on the financial statements and financial statement schedule based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such financial statements present fairly, in all material respects, the financial position of Black Hills Power, Inc. as of December 31, 20132015 and 20122014, and the results of itstheir operations and itstheir cash flows for each of the three years in the period ended December 31, 20132015, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, such financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presentpresents fairly in all material respects the information set forth therein.

/s/ DELOITTE & TOUCHE LLP

Minneapolis, Minnesota
February 27, 201426, 2016


2526



BLACK HILLS POWER, INC.
STATEMENTS OF INCOME

Years ended December 31,201320122011201520142013
(in thousands)(in thousands)
  
Revenue$254,027
$243,309
$245,631
$277,864
$268,488
$254,027
  
Operating expenses:  
Fuel and purchased power89,437
87,519
93,222
83,339
93,976
89,437
Operations and maintenance68,857
65,835
66,683
68,088
70,356
68,857
Gain on sale of operating assets

(768)
Depreciation and amortization28,125
27,621
27,217
32,552
29,100
28,125
Taxes - property5,264
4,753
4,557
5,971
5,942
5,264
Total operating expenses191,683
185,728
190,911
189,950
199,374
191,683
  
Operating income62,344
57,581
54,720
87,914
69,114
62,344
  
Other income (expense):  
Interest expense(19,725)(17,602)(16,712)(22,337)(20,569)(19,725)
AFUDC - borrowed186
161
419
506
248
186
Interest income248
376
154
657
619
248
AFUDC - equity368
325
705
918
519
368
Other expense(196)
(344)(117)(105)(196)
Other income367
554
145
233
248
367
Total other income (expense)(18,752)(16,186)(15,633)(20,140)(19,040)(18,752)
  
Income from continuing operations before income taxes43,592
41,395
39,087
Income before income taxes67,774
50,074
43,592
Income tax expense(13,419)(14,309)(11,990)(22,600)(16,512)(13,419)
  
Net income$30,173
$27,086
$27,097
$45,174
$33,562
$30,173


The accompanying notes to financial statements are an integral part of these financial statements.


2627




BLACK HILLS POWER, INC.
STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

Years ended December 31,201320122011201520142013
(in thousands)(in thousands)
  
Net income$30,173
$27,086
$27,097
$45,174
$33,562
$30,173
  
Other comprehensive income (loss), net of tax:  
Benefit plan liability adjustments - net gain (loss) (net of tax of ($73), $93 and $38, respectively)139
(171)(70)
Reclassification adjustment of benefit plan liability - net gain (loss) (net of tax of $(23), $0 and $0)43


 
Reclassification adjustment of cash flow hedges settled and included in net income (loss) (net of tax of $(23), $(23) and $(23), respectively)41
41
42
 
Benefit plan liability adjustments - net gain (loss) (net of tax of $(36), $189 and $(73), respectively)68
(351)139
Reclassification adjustment of benefit plan liability - net gain (loss) (net of tax of $(33), $(16) and $(23), respectively)61
29
43
Reclassification adjustment of cash flow hedges settled and included in net income (loss) (net of tax of $319, $(364) and $(23), respectively)383
(300)41
Other comprehensive income (loss), net of tax223
(130)(28)512
(622)223
  
Comprehensive income (loss), net of tax$30,396
$26,956
$27,069
$45,686
$32,940
$30,396

See Note 7 for additional disclosure related to comprehensive income.

The accompanying notes to financial statements are an integral part of these financial statements.

2728



BLACK HILLS POWER, INC.
BALANCE SHEETS
As of December 31,2013201220152014
(in thousands, except share amounts)(in thousands, except share amounts)
ASSETS  
Current assets:  
Cash and cash equivalents$2,259
$3,805
$7,559
$6,620
Receivables - customers, net25,799
23,867
27,856
34,684
Receivables - affiliates4,934
5,027
5,747
5,350
Other receivables, net579
673
236
259
Money pool notes receivable17,292
31,645
76,813
68,626
Materials, supplies and fuel23,278
20,633
24,282
20,965
Deferred income tax assets, net, current2,170
16,631

13,661
Regulatory assets, current4,891
4,998
14,096
10,257
Other current assets4,933
5,781
43,118
4,954
Total current assets86,135
113,060
199,707
165,376
  
Investments4,431
4,359
4,725
4,584
  
Property, plant and equipment1,095,884
1,024,768
1,166,126
1,115,061
Less accumulated depreciation and amortization(334,174)(322,830)(326,074)(309,767)
Total property, plant and equipment, net761,710
701,938
840,052
805,294
  
Other assets:  
Regulatory assets, non-current40,373
48,244
71,717
68,427
Other, non-current assets8,524
5,322
3,292
11,708
Total other assets48,897
53,566
75,009
80,135
TOTAL ASSETS$901,173
$872,923
$1,119,493
$1,055,389
 
 
The accompanying notes to financial statements are an integral part of these financial statements.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

The accompanying notes to financial statements are an integral part of these financial statements.


2829



BLACK HILLS POWER, INC.
BALANCE SHEETS
(Continued)

BLACK HILLS POWER, INC.
BALANCE SHEETS
(Continued)
 
As of December 31,2013201220152014
(in thousands, except share amounts)(in thousands, except share amounts)
LIABILITIES AND STOCKHOLDER’S EQUITY  
Current liabilities:  
Accounts payable$26,144
$14,318
$21,297
$30,543
Accounts payable - affiliates21,082
21,896
30,032
19,242
Accrued liabilities14,966
15,477
69,454
16,415
Regulatory liabilities, current161
37

3,073
Total current liabilities62,353
51,728
120,783
69,273
  
Long-term debt269,948
269,944
342,756
342,752
  
Deferred credits and other liabilities:  
Deferred income tax liabilities, net, non-current167,309
158,918
188,961
193,042
Regulatory liabilities, non-current43,357
43,849
51,583
51,916
Benefit plan liabilities12,105
25,888
20,033
20,981
Other, non-current liabilities4,247
3,138
3,398
2,631
Total deferred credits and other liabilities227,018
231,793
263,975
268,570
  
Commitments and contingencies (Notes 4, 8, 9 and 11) 
  
Stockholder’s equity:  
Common stock $1 par value; 50,000,000 shares authorized; 23,416,396 shares issued23,416
23,416
23,416
23,416
Additional paid-in capital39,575
39,575
39,575
39,575
Retained earnings280,060
257,887
330,295
313,622
Accumulated other comprehensive loss(1,197)(1,420)(1,307)(1,819)
Total stockholder’s equity341,854
319,458
391,979
374,794
TOTAL LIABILITIES AND STOCKHOLDER’S EQUITY$901,173
$872,923
$1,119,493
$1,055,389

The accompanying notes to financial statements are an integral part of these financial statements.

2930



BLACK HILLS POWER, INC.
STATEMENTS OF CASH FLOWS

Years ended December 31,201320122011201520142013
(in thousands)(in thousands)
Operating activities:  
Net income$30,173
$27,086
$27,097
$45,174
$33,562
$30,173
Adjustments to reconcile net income to net cash provided by operating activities -  
Depreciation and amortization28,125
27,621
27,217
32,552
29,100
28,125
Deferred income taxes13,582
24,628
(2,931)7,690
16,518
13,582
AFUDC - equity(368)(325)(705)(918)(519)(368)
Gain on sale of operating assets

(768)
Employee benefits3,094
3,828
2,406
2,403
1,295
3,094
Other adjustments1,400
1,187
617
232
(2,330)1,400
Change in operating assets and liabilities -  
Accounts receivable and other current assets(5,175)2,916
(973)(2,236)(10,412)(5,265)
Accounts payable and other current liabilities1,180
(903)989
21,652
10,829
1,180
Contributions to defined benefit pension plan(2,299)(6,835)

(1,696)(2,299)
Regulatory assets(3,839)(5,366)107
Regulatory liabilities(2,479)2,479
(17)
Other operating activities(3,149)(6,625)(1,515)(5,680)(6,624)(3,149)
Net cash provided by (used in) operating activities66,563
72,578
51,434
Net cash provided by operating activities94,551
66,836
66,563
  
Investing activities:  
Property, plant and equipment additions(74,390)(40,415)(40,910)(56,795)(82,826)(74,390)
Proceeds from sale of operating assets

1,135
Notes receivable from affiliate companies, net6,353
(25,152)(10,615)(36,687)(51,334)6,353
Other investing activities(72)469
(197)(128)(154)(72)
Net cash provided by (used in) investing activities(68,109)(65,098)(50,587)(93,610)(134,314)(68,109)
  
Financing activities:  
Long-term debt - repayments
(6,487)(80)
(12,200)
Long-term debt - issuance
85,000

Other financing activities(2)(961)
Net cash provided by (used in) financing activities
(6,487)(80)(2)71,839

  
Net change in cash and cash equivalents(1,546)993
767
939
4,361
(1,546)
  
Cash and cash equivalents:  
Beginning of year3,805
2,812
2,045
6,620
2,259
3,805
End of year$2,259
$3,805
$2,812
$7,559
$6,620
$2,259

See Note 10 for Supplemental Cash Flows information.

The accompanying notes to financial statements are an integral part of these financial statements.

3031



BLACK HILLS POWER, INC.
STATEMENTS OF COMMON STOCKHOLDER’S EQUITY

201320122011201520142013
(in thousands)(in thousands)
Common stock shares:  
Balance beginning of year23,416
23,416
23,416
23,416
23,416
23,416
Issuance of common stock





Balance end of year23,416
23,416
23,416
23,416
23,416
23,416
  
Common stock amounts:  
Balance beginning of year$23,416
$23,416
$23,416
$23,416
$23,416
$23,416
Issuance of common stock





Balance end of year$23,416
$23,416
$23,416
$23,416
$23,416
$23,416
  
Additional paid-in capital:  
Balance beginning of year$39,575
$39,575
$39,575
$39,575
$39,575
$39,575
Issuance of common stock





Balance end of year$39,575
$39,575
$39,575
$39,575
$39,575
$39,575
  
Retained earnings:  
Balance beginning of year$257,887
$274,785
$247,688
$313,622
$280,060
$257,887
Net income30,173
27,086
27,097
45,174
33,562
30,173
Non-cash dividend to Parent company(8,000)(43,984)
(28,501)
(8,000)
Balance end of year$280,060
$257,887
$274,785
$330,295
$313,622
$280,060
  
Accumulated other comprehensive loss:  
Balance beginning of year$(1,420)$(1,290)$(1,262)$(1,819)$(1,197)$(1,420)
Other comprehensive (loss) income, net of tax223
(130)(28)512
(622)223
Balance end of year$(1,197)$(1,420)$(1,290)$(1,307)$(1,819)$(1,197)
  
Total stockholder’s equity$341,854
$319,458
$336,486
$391,979
$374,794
$341,854

The accompanying notes to financial statements are an integral part of these financial statements.

3132



NOTES TO FINANCIAL STATEMENTS
December 31, 20132015, 20122014 and 20112013


(1)    BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Business Description

Black Hills Power, Inc. (the Company, “we,” “us” or “our”) is ana regulated electric utility serving customers in South Dakota, Wyoming and Montana. We are a wholly-owned subsidiary of BHC or the Parent, a public registrant listed on the New York Stock Exchange.

Basis of Presentation

The financial statements include the accounts of Black Hills Power, Inc. and also our ownership interests in the assets, liabilities and expenses of our jointly owned facilities (Note 3) and are prepared in accordance with GAAP.

Use of Estimates and Basis of Presentation

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Cash Equivalents

We consider all highly liquid investments with an original maturity of three months or less to be cash equivalents.

Regulatory Accounting

Our regulated electric operations are subject to regulation by various state and federal agencies. The accounting policies followed are generally subject to the Uniform System of Accounts of FERC.

Our regulated utility operations follow accounting standards for regulated operations and our financial statements reflect the effects of the different rate making principles followed by the various jurisdictions regulating our electric operations. If rate recovery becomes unlikely or uncertain due to competition or regulatory action, these accounting standards may no longer apply to our regulated operations. In the event we determine that we no longer meet the criteria for following accounting standards for regulated operations, the accounting impact to us could be an extraordinary non-cash charge to operations in an amount that could be material.

Regulatory assets are included in Regulatory assets, current and Regulatory assets, non-current on the accompanying Balance Sheets. Regulatory liabilities are included in Regulatory liabilities, current and Regulatory liabilities, non-current on the accompanying Balance Sheets.

3233



We had the following regulatory assets and liabilities as follows as of December 31 (in thousands):
Maximum Recovery Period (in years)20132012Maximum Recovery Period (in years)20152014
Regulatory assets:    
Unamortized loss on reacquired debt(a)
14$2,257
$2,501
9$2,096
$2,377
AFUDC(b)
458,327
8,460
458,571
8,365
Employee benefit plans(c)
1315,233
27,001
1220,866
24,418
Deferred energy costs(a)
17,711
6,892
119,875
14,696
Flow through accounting(a)
359,723
8,019
3512,104
11,171
Other regulatory assets(a)
22,013
369
Decommissioning costs (b)
913,686
11,786
Other regulatory assets(a) (d)
28,615
5,871
Total regulatory assets $45,264
$53,242
 $85,813
$78,684
    
Regulatory liabilities:    
Cost of removal for utility plant(a)
53$30,467
$26,630
53$38,131
$35,510
Employee benefit plans(d)
1310,177
15,689
Other regulatory liabilities(e)
132,874
1,567
Employee benefit plans(c)
1212,616
14,538
Other regulatory liabilities(c)
13836
4,941
Total regulatory liabilities $43,518
$43,886
 $51,583
$54,989
____________________
(a)    Recovery of costs but we are not allowed a rate of return.
(b)In addition to recovery of costs, we are allowed a rate of return.
(c)
In addition to recovery or repayment of costs, we are allowed a return on approximately $24 million according to the approveda portion of this amount or a reduction in rate case.
base, respectively.
(d)
Approximately $13Includes approximately $5.0 million is included in our rate base calculation as a reduction to rate base.
(e)
Approximately $0.8 million is included in our rate base calculation as a reduction to rate base.
of vegetation management expenses.

Regulatory assets represent items we expect to recover from customers through probable future rates.

Unamortized Loss on Reacquired Debt - The early redemption premium on reacquired bonds is being amortized over the remaining term of the original bonds.

AFUDC - The equity component of AFUDC is considered a permanent difference for tax purposes with the tax benefit being flowed through to customers as prescribed or allowed by regulators. If, based on a regulator’s action, it is probable the utility will recover the future increase in taxes payable represented by this flow-through treatment through a rate revenue increase, a regulatory asset is recognized. This regulatory asset itself is a temporary difference for which a deferred tax liability must be recognized. Accounting standards for income taxes specifically address AFUDC-equity, and require a gross-up of such amounts to reflect the revenue requirement associated with a rate-regulated environment.

Employee Benefit Plans - Employee benefit plans include the unrecognized prior service costs and net actuarial loss associated with our defined benefit pension plans and post-retirement benefit plans in regulatory assets rather than in accumulated other comprehensive income. In addition, this regulatory asset includes the income tax effect of the adjustment required under accounting for compensation-defined benefit plans to record the full pension and post-retirement benefit obligations. Such amounts have been grossed-up to reflect the revenue requirement associated with a rate regulated environment.

Deferred Energy Costs - Deferred energy and fuel cost adjustments represent the cost of electricity delivered to our utility customers that are either higher or lower than the current rates and will be recovered or refunded in future rates. Deferred energy and fuel cost adjustments are recorded and recovered or amortized as approved by the appropriate state commission.


34



Flow-Through Accounting - Under flow-through accounting, the income tax effects of certain tax items are reflected in our cost of service for the customer in the year in which the tax benefits are realized and result in lower utility rates. This regulatory treatment was applied to the tax benefit generated by repair costs that were previously capitalized for tax purposes in a rate case settlement that was reached in 2010. In this instance, the agreed upon rate increase was less than it would have been absent the flow-through treatment. A regulatory asset established to reflect the future increases in income taxes payable will be recovered from customers as the temporary differences reverse. As a result of this regulatory treatment, we continue to record a tax benefit consistent with the flow-through method with respect to costs considered repairs for tax purposes and are capitalized for book purposes.


33Decommissioning Costs - We received approval in 2014 for regulatory treatment on the remaining net book values and decommissioning costs of our decommissioned coal plants.



Regulatory liabilities represent items we expect to refund to customers through probable future decreases in rates.

Cost of Removal for Utility Plant - Cost of removal for utility plant represents the estimated cumulative net provisions for future removal costs included in depreciation expense for which there is no legal obligation for removal.

Employee Benefit Plans - Employee benefit plans represent the cumulative excess of pension and retiree healthcare costs recovered in rates over pension expense recorded in accordance with accounting standards for compensation - retirement benefits. In addition, this regulatory liability includes the income tax effect of the adjustment required under accounting for compensation - defined benefit plans, to record the full pension and post-retirement benefit obligations. Such income tax effect has been grossed-up to account for the revenue requirement aspect of a rate regulated environment.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable consistconsists of sales to residential, commercial, industrial, municipal and other customers all of which do not bear interest. These accounts receivable are stated at billed and unbilled amounts net of write-offs or payment received.

We maintain an allowance for doubtful accounts which reflects our best estimate of uncollectible trade receivables. We regularly review our trade receivable allowances by considering such factors as historical experience, credit worthiness, the age of the receivable balances and current economic conditions that may affect collectibility. The allowance is calculated by applying estimated write-off factors to various classes of outstanding receivables, including unbilled revenue. The write-off factors used to estimate uncollectible accounts are based upon consideration of both historical collections experience and management’s best estimate of future collection success given the existing collections environment.

Following is a summary of accounts receivable at December 31 (in thousands):
2013201220152014
Accounts receivable trade$16,300
$14,965
$15,268
$24,946
Unbilled revenues9,719
9,004
12,795
9,999
Allowance for doubtful accounts(220)(102)(207)(261)
Net accounts receivable$25,799
$23,867
Net accounts receivable trade$27,856
$34,684


35



Revenue Recognition

Revenue is recognized when there is persuasive evidence of an arrangement with a fixed or determinable price, delivery has occurred or services have been rendered, and collectibility is reasonably assured. Taxes collected from our customers are recorded on a net basis (excluded from Revenue).

Utility revenues are based on authorized rates approved by the state regulatory agencies and the FERC. Revenues related to the sale, transmission and distribution of energy, and delivery of service are generally recorded when service is rendered or energy is delivered to customers. To the extent that deliveries have occurred but a bill has not been issued, we accrue an estimate of the revenue since the latest billing. This estimate is calculated based upon several factors including billings through the last billing cycle in a month, and prices in effect in our jurisdictions. Each month the estimated unbilled revenue amounts are trued-up and recorded in Receivables- customers, net on the accompanying Balance Sheets.

Materials, Supplies and Fuel

Materials, supplies and fuel used for construction, operation and maintenance purposes are generally stated on a weighted-average cost basis.

Other Current Assets

The following amounts by major classification are included in Other current assets on the accompanying Balance Sheets as of (in thousands):
 December 31, 2015
December 31, 2014
Accrued receivables related to litigation expenses and settlements$39,050
$
Other (none of which is individually significant)4,068
4,954
Total other current assets$43,118
$4,954

Accrued Liabilities

The following amounts by major classification are included in Accrued liabilities on the accompanying Balance Sheets as of (in thousands):

 December 31, 2015December 31, 2014
Accrued employee compensation, benefits and withholdings$5,054
$4,689
Accrued property taxes4,962
4,721
Accrued payments related to litigation expenses and settlements38,750

Accrued income taxes13,031

Customer deposits and prepayments2,216
1,934
Accrued interest4,600
4,662
Other (none of which is individually significant)841
409
Total accrued liabilities$69,454
$16,415

Deferred Financing Costs

Deferred financing costs are amortized using the effective interest method over the term of the related debt.


3436



Property, Plant and Equipment

Additions to property, plant and equipment are recorded at cost when placed in service. Included in the cost of regulated construction projects is AFUDC, which represents the approximate composite cost of borrowed funds and a return on equity used to finance a regulated utility project. The cost of regulated electric property, plant and equipment retired, or otherwise disposed of in the ordinary course of business, less salvage, is charged to accumulated depreciation. Removal costs associated with non-legal obligations are reclassified from accumulated depreciation and reflected as regulatory liabilities. Ordinary repairs and maintenance of property, except as allowed under rate regulations, are charged to operations as incurred.

Depreciation provisions for regulated electric property, plant and equipment are computed on a straight-line basis using an annual composite rate of 2.3% in 2015, 2.3% in 2014 and 2.1% in 2013, 2.2% in 2012 and 2.2% in 2011.

Derivatives and Hedging Activities

From time to time we utilize risk management contracts including forward purchases and sales to hedge the price of fuel for our combustion turbines and fixed-for-float swaps to fix the interest on any variable rate debt. Contracts that qualify as derivatives under accounting standards for derivatives, and that are not exempted such as normal purchase/normal sale, are required to be recorded in the balance sheet as either an asset or liability, measured at its fair value. Accounting standards for derivatives require that changes in the derivative instrument’s fair value be recognized currently in earnings unless specific hedge accounting criteria are met.

Accounting standards for derivatives allow hedge accounting for qualifying fair value and cash flow hedges. Gain or loss on a derivative instrument designated and qualifying as a fair value hedging instrument as well as the offsetting loss or gain on the hedged item attributable to the hedged risk should be recognized currently in earnings in the same accounting period. Conversely, the effective portion of the gain or loss on a derivative instrument designated and qualifying as a cash flow hedging instrument should be reported as a component of other comprehensive income and be reclassified into earnings or as a regulatory asset or regulatory liability, net of tax, in the same period or periods during which the hedged forecasted transaction affects earnings. The remaining gain or loss on the derivative instrument, if any, is recognized currently in earnings.

Revenues and expenses on contracts that qualify are designated as normal purchases and normal sales and are recognized when the underlying physical transaction is completed under the accrual basis of accounting. Normal purchases and normal sales are contracts where physical delivery is probable, quantities are expected to be used or sold in the normal course of business over a reasonable amount of time, and price is not tied to an unrelated underlying derivative. As part of our regulated electric operations, we enter into contracts to buy and sell energy to meet the requirements of our customers. These contracts include short-term and long-term commitments to purchase and sell energy in the retail and wholesale markets with the intent and ability to deliver or take delivery. If it was determined that a transaction designated as a normal purchase or normal sale no longer met the exceptions, the fair value of the related contract would be reflected as either an asset or liability, under the accounting standards for derivatives and hedging.

Fair Value Measurements

Accounting standards for fair value measurements provide a single definition of fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date and also requires disclosures and establishes a fair value hierarchy that prioritizes the inputs used to measure fair value. The fair value hierarchy ranks the quality and reliability of the information used to determine fair values giving the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements).

Financial assets and liabilities carried at fair value are classified and disclosed in one of the following three categories:

Level 1 - Unadjusted quoted prices available in active markets that are accessible at the measurement date for identical unrestricted assets or liabilities.


37



Level 2 - Pricing inputs include quoted prices for identical or similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

Level 3 - Pricing inputs include significant inputs that are generally less observable from objective sources.


35



Impairment of Long-Lived Assets

We periodically evaluate whether events and circumstances have occurred which may affect the estimated useful life or the recoverability of the remaining balance of our long-lived assets. If such events or circumstances were to indicate that the carrying amount of these assets was not recoverable, we would estimate the future cash flows expected to result from the use of the assets and their eventual disposition. If the sum of the expected future cash flows (undiscounted and without interest charges) was less than the carrying amount of the long-lived assets, we would recognize an impairment loss.

Income Taxes

We file a federal income tax return with other members of the Parent’s consolidated group. For financial statement purposes, federal income taxes are allocated to the individual companies based on amounts calculated on a separate return basis.

We use the asset and liability method in accounting for income taxes. Under the liability method, deferred income taxes are recognized at currently enacted income tax rates, to reflect the tax effect of temporary differences between the financial and tax basis of assets and liabilities, as well as operating loss and tax credit carryforwards. Such temporary differences are the result of provisions in the income tax law that either require or permit certain items to be reported on the income tax return in a different period than they are reported in the financial statements. WeAt December 31, 2015, we have chosen to early adopt on a prospective basis ASU 2015-17 as discussed below under Recently Issued and Adopted Accounting Standards. As of December 31, 2015, we classify all deferred tax assets and liabilities intoas non-current. The prior period is presented under the previous guidance for classifying deferred tax assets and deferred tax liabilities as current and non-current amounts based on the classification of the related assets and liabilities.non-current.

It is the Parent’s policy to apply the flow-through method of accounting for investment tax credits. Under the flow-through method, investment tax credits are reflected in net income as a reduction to income tax expense in the year they qualify. Another acceptable accounting method and an exception to this general policy is to apply the deferral method whereby the credit is amortized as a reduction of income tax expense over the useful lives of the related property which gave rise to the credits.

We recognize interest income or interest expense and penalties related to income tax matters in Income tax (expense) benefit on the Statements of Income.

We account for uncertainty in income taxes recognized in the financial statements in accordance with accounting standards for income taxes. The unrecognized tax benefit is classified in Other - non-current liabilities on the accompanying Balance Sheets. See Note 6 for additional information.

Recently Issued and Adopted Accounting StandardsPrinciples

Other Comprehensive Income: PresentationBalance Sheet Classification of Comprehensive Income,Deferred Taxes, ASU 2011-05 and Deferral of the Effective Date for Amendments to the Presentation of Reclassification of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update 2011-05 and ASU 2011-122015-17

In November 2015, the FASB issued an accounting standards update amending ASC 220 to improve the comparability, consistency and transparency of reporting of comprehensive income. It amends existingASU 2015-17 providing guidance by allowing only two options for presenting the components of net income and other comprehensive income: (1) in a single continuouson financial statement statement of comprehensive income or (2) in two separate but consecutive financial statements, consisting of an income statement followed by a separate statement of other comprehensive income. Also, items thatpresentation for deferred tax assets and deferred tax liabilities. All deferred taxes are reclassified from other comprehensive income to net income must be presented on the faceas non-current. FASB issued this guidance as part of the financial statements. ASU No. 2011-05 requires retrospective application, and itits initiative to reduce complexity in accounting standards. This guidance is effective for fiscal years andbeginning after December 15, 2016, including interim periods within those years beginning after December 15, 2011, with(i.e., in the first quarter of 2017 for calendar year-end companies). The guidance may be applied either prospectively, for all deferred tax assets and liabilities, or retrospectively by reclassifying the comparative balance sheets. Early adoption is permitted. We have chosen early adoption permitted. Inas of December 2011, FASB issued ASU 2011-12. ASU 2011-12 indefinitely31, 2015, on a prospective basis. At December 31, 2015, the balance sheet reflects a net non-current deferred the provisionstax liability of ASU 2011-05 requiring the$189 million. The balance sheet presentation as of reclassification adjustments for items reclassified from other comprehensive income toDecember 31, 2014 was not adjusted retrospectively and remains as previously reported with a net income be presented on the facecurrent deferred tax asset of the financial statements. Ultimately FASB chose not to reinstate the reclassification adjustment requirements in ASU 2011-05 but instead issued ASU 2013-02 in February 2013. The adoption$14 million and a non-current deferred tax liability of this standard did not have an impact on our financial position, results of operations or cash flows.$193 million.


3638



ReportingSimplifying the Presentation of Amounts Reclassified Out of Accumulated Other Comprehensive Income,Debt Issuance Costs, ASU 2013-022015-03

In February 2013,April 2015, the FASB issued new disclosure requirements for items reclassified outASU 2015-03, Simplifying the Presentation of AOCIDebt Issuance Costs. Debt issuance costs related to expanda recognized debt liability will be presented on the disclosure requirements in ASC 220, Comprehensive Income, forbalance sheet as a direct deduction from the debt liability, similar to the presentation of changes in AOCI.debt discounts, rather than as an asset. Amortization of these costs will continue to be reported as interest expense. ASU 2013-02 requires disclosure of (1) changes in components of other comprehensive income, (2) for items reclassified out of AOCI and into net income in their entirety, the effect of the reclassification on each affected net income line item and (3) cross references to other disclosures that provide additional detail for components of other comprehensive income that are not reclassified in their entirety to net income. Disclosures are required either on the face of the statements of income or as a separate disclosure in the notes to the financial statements. The new disclosure requirements are2015-03 is effective for annual and interim and annualreporting periods beginning after December 15, 2012.2015. Early adoption is permitted. We have chosen not to early adopt ASU 2015-03.

Revenue from Contracts with Customers, ASU 2014-09
In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows from an entity’s contracts with customers. On July 9, 2015, FASB voted to defer the effective date of ASU 2014-09 by one year. The guidance would be effective for annual and interim reporting periods beginning after December 15, 2018 and early adoption is permitted. We are currently assessing the impact that adoption of this standard did notASU 2014-09 will have an impact on our financial position, results of operations or cash flows.

Recently Issued Accounting Pronouncements and Legislation

Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists

In July 2013, the FASB issued an amendment to accounting for income taxes which provides guidance on financial statement presentation of an unrecognized tax benefit when an NOL carryforward, a similar tax loss, or a tax credit carryforward exists. The objective in issuing this amendment is to eliminate diversity in practice resulting from a lack of guidance on this topic in current GAAP. Under the amendment, an entity must present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for an NOL carryforward, a similar tax loss, or a tax credit carryforward except under certain conditions. The amendment is effective for fiscal years beginning after December 15, 2013, and interim periods within those years and should be applied to all unrecognized tax benefits that exist as of the effective date. The adoption of this standard is not expected to have an impact on our financial position, results of operations or cash flows.

Final Tangible Personal Property Regulations, IRS Treasury Decision 9636

In September 2013, the U.S. Treasury issued final regulations addressing the tax consequences associated with amounts paid to acquire, produce, or improve tangible property. The regulations have the effect of a change in law and as a result the impact should be taken into account in the period of adoption. In general, such regulations apply to tax years beginning on or after January 1, 2014, with early adoption permitted. We expect that implementation of most, if not all, of the provisions of the final regulations to occur in 2014. Procedural guidance is expected from IRS in early 2014 to facilitate implementation. Analysis performed to date indicates no material impact to our financial statements.



37



(2)    PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment at December 31 consisted of the following (dollars in thousands):
 2013 2012  2015 2014 
 Weighted Weighted  Weighted Weighted 
 Average AverageLives (in years) Average AverageLives (in years)
2013Useful Life (in years)2012Useful Life (in years)MinimumMaximum2015Useful Life (in years)2014Useful Life (in years)MinimumMaximum
Electric plant:        
Production$512,444
51$510,674
514565$569,182
46$567,936
484065
Transmission115,149
46115,092
464060117,708
48115,949
464060
Distribution315,971
39304,113
381645353,241
46336,652
392060
Plant acquisition adjustment (a)
4,870
324,870
324,870
324,870
32
General70,228
2271,802
2284588,939
2279,738
22540
Total plant-in-service1,018,662
 1,006,551
 1,133,940
 1,105,145
 
Construction work in progress77,222
 18,217
 32,186
 9,916
 
Total electric plant1,095,884
 1,024,768
 1,166,126
 1,115,061
 
Less accumulated depreciation and amortization(334,174) (322,830) (326,074) (309,767) 
Electric plant net of accumulated depreciation and amortization$761,710
 $701,938
 $840,052
 $805,294
 
__________________
(a)The plant acquisition adjustment is included in rate base and is being recovered with 1715 years remaining.


39



(3)    JOINTLY OWNED FACILITIES

We use the proportionate consolidation method to account for our percentage interest in the assets, liabilities and expenses of the following facilities:

We own a 20% interest in the Wyodak Plant (the “Plant”), a coal-fired electric generating station located in Campbell County, Wyoming. PacifiCorp owns the remaining ownership percentage and is the operator of the Plant. We receive our proportionate share of the Plant’s capacity and are committed to pay our share of its additions, replacements and operating and maintenance expenses.

We own a 35% interest in, and are the operator of, the Converter Station Site and South Rapid City Interconnection (the transmission tie), an AC-DC-AC transmission tie. Basin Electric owns the remaining ownership percentage. The transmission tie provides an interconnection between the Western and Eastern transmission grids, which provides us with access to both the WECC region and the MAPP region. The total transfer capacity of the transmission tie is 400 MW - 200 MW West to East and 200 MW from East to West. We are committed to pay our proportionate share of the additions, replacements and operating and maintenance expenses.

We own a 52% interest in the Wygen III power plant. MDU and the City of Gillette each owns an undivided ownership interest in Wygen III and are obligated to make payments for costs associated with administrative services and a proportionate share of the costs of operating the plant for the life of the facility. We retain responsibility for plant operations.

We own 55 MW of Cheyenne Prairie, a 95 MW gas-fired power generation facility located in Cheyenne, Wyoming. Cheyenne Light owns the remaining 40 MW. This facility was placed into commercial operations on October 1, 2014. We are committed to pay our proportionate share of the additions, replacements and operating and maintenance expenses.

The investments in our jointly owned plants and accumulated depreciation are included in the corresponding captions in the accompanying Balance Sheets. Our share of direct expenses of the PlantPlants is included in the corresponding categories of operating expenses in the accompanying Statements of Income. Each of the respective owners is responsible for providing its own financing.


38



As of December 31, 20132015, our interests in jointly-owned generating facilities and transmission systems included on our Balance Sheets were as follows (in thousands):
Interest in jointly-owned facilitiesPlant in ServiceConstruction Work in ProgressAccumulated DepreciationPlant in ServiceConstruction Work in ProgressAccumulated Depreciation
Wyodak Plant$109,800
$192
$50,595
$111,532
$1,039
$56,812
Transmission Tie$19,648
$
$4,741
$19,648
$
$5,390
Wygen III$131,468
$713
$10,593
$137,860
$446
$16,217
Cheyenne Prairie$91,081
$
$3,301


(4)    LONG-TERM DEBT

Long-term debt outstanding at December 31 was as follows (in thousands):
Maturity DateInterest Rate20132012Maturity DateInterest Rate20152014
First Mortgage Bonds due 2032August 15, 20327.23%$75,000
$75,000
August 15, 20327.23%$75,000
$75,000
First Mortgage Bonds due 2039November 1, 20396.125%180,000
180,000
November 1, 20396.125%180,000
180,000
First Mortgage Bonds due 2044October 20, 20444.43%85,000
85,000
Unamortized discount, First Mortgage Bonds due 2039  (107)(111)  (99)(103)
Pollution control revenue bonds due 2024October 1, 20245.35%12,200
12,200
Series 94A Debt(a)
June 1, 20240.75%2,855
2,855
June 1, 20240.75%2,855
2,855
Long-term debt  $269,948
$269,944
  $342,756
$342,752
___________________
(a)
Variable interest rate at December 31, 2013.2015.

40




On October 1, 2014 we issued $85 million of 4.43% coupon first mortgage bonds due October 20, 2044. Proceeds from our bond sale funded the early redemption of our 5.35% $12 million pollution control revenue bonds, originally due October 1, 2024.

Net deferred financing costs of approximately $2.83.1 million and $2.93.3 million were recorded on the accompanying Balance Sheets in Other, non-current assets at December 31, 20132015 and 20122014, respectively, and are being amortized over the term of the debt. Amortization of deferred financing costs of approximately $0.1 million, $0.20.1 million and $0.50.1 million for the years ended December 31, 20132015, 20122014 and 20112013, respectively, are included in Interest expense on the accompanying Statements of Income.

Substantially all of our property is subject to the lien of the indenture securing our first mortgage bonds. First mortgage bonds may be issued in amounts limited by property, earnings and other provisions of the mortgage indentures. We were in compliance with our debt covenants at December 31, 2013.2015.

Long-term Debt Maturities

Scheduled maturities of our outstanding long-term debt (excluding unamortized discounts) are as follows (in thousands):
2014$
2015$
2016$
$
2017$
$
2018$
$
2019$
2020$
Thereafter$270,055
$342,855


39




(5)    FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair values of our financial instruments at December 31 were as follows (in thousands):
2013201220152014
Carrying ValueFair ValueCarrying ValueFair ValueCarrying ValueFair ValueCarrying ValueFair Value
Cash and cash equivalents (a)
$2,259
$2,259
$3,805
$3,805
$7,559
$7,559
$6,620
$6,620
Long-term debt, including current maturities (b)
$269,948
$317,531
$269,944
$359,567
$342,756
$404,864
$342,752
$430,497
_______________
(a)Fair value approximates carrying value due to either short-term length of maturity or variable interest rates that approximate prevailing market rates and therefore is classified in Level 1 in the fair value hierarchy.
(b)Long-term debt is valued using the market approach based on observable inputs of quoted market prices and yields available for debt instruments either directly or indirectly for similar maturities and debt ratings in active markets and therefore is classified in Level 2 in the fair value hierarchy. The carrying amount of our variable rate debt approximates fair value due to the variable interest rates with short reset periods. For additional information on our long-term debt see Note 4 to the Financial Statements.4.

The following methods and assumptions were used to estimate the fair value of each class of our financial instruments.

Cash and Cash Equivalents

Included in cash and cash equivalents is cash and overnight repurchase agreement accounts. As part of our cash management process, excess operating cash is invested in overnight repurchase agreements with our bank. Repurchase agreements are not deposits and are not insured by the U.S. Government, the FDIC or any other government agency and involve investment risk including possible loss of principal. We believe however, that the market risk arising from holding these financial instruments is minimal.


41



(6)    INCOME TAXES

Income tax expense (benefit) from continuing operations for the years ended December 31 werewas as follows (in thousands):

201320122011201520142013
Current$(163)$(10,319)$14,921
$14,910
$(6)$(163)
Deferred13,582
24,628
(2,931)7,690
16,518
13,582
Total income tax expense$13,419
$14,309
$11,990
$22,600
$16,512
$13,419


40



The temporary differences which gave rise to the net deferred tax liability, for the years ended December 31 were as follows (in thousands):
2013201220152014
Deferred tax assets:  
Employee benefits$4,567
$5,094
$4,683
$4,995
Net operating loss4,197
10,441
15
14,794
Regulatory liabilities6,398
13,433
9,908
10,824
Other2,193
2,381
16,171
2,864
Total deferred tax assets17,355
31,349
30,777
33,477
  
Deferred tax liabilities:  
Accelerated depreciation and other plant related differences(161,990)(154,989)(187,666)(184,478)
AFUDC(8,190)(5,499)(8,571)(8,365)
Regulatory assets(3,540)(5,767)(4,236)(3,910)
Employee benefits(3,467)(3,610)(3,003)(3,723)
Deferred costs(4,240)(2,608)(14,765)(11,324)
Other(1,067)(1,163)(1,497)(1,058)
Total deferred tax liabilities(182,494)(173,636)(219,738)(212,858)
  
Net deferred tax assets (liabilities)$(165,139)$(142,287)$(188,961)$(179,381)

The effective tax rate differs from the federal statutory rate for the years ended December 31, as follows:
201320122011201520142013
Federal statutory rate35.0 %35.0 %35.0 %35.0 %35.0 %35.0 %
Amortization of excess deferred and investment tax credits(0.3)(0.3)(0.4)(0.1)(0.3)(0.3)
Equity AFUDC
(0.1)(0.6)(0.6)(0.1)
Flow through adjustments *
(2.5)(3.5)(3.4)
Prior year deferred adjustment **

3.6

Flow through adjustments (a)
(0.9)(1.9)(2.5)
Tax credits(0.8)


(0.2)(0.8)
Other(0.6)(0.1)0.1

0.5
(0.6)
30.8 %34.6 %30.7 %33.4 %33.0 %30.8 %
_________________________
*(a)The flow-through adjustments relate primarily to an accounting method change for tax purposes that allows us to take a current tax deduction for repair costs that continue to be capitalized for book purposes. We recorded a deferred income tax liability in recognition of the temporary difference created between book and tax treatment and we flowed the tax benefit through to our customers in the form of lower rates as a result of a rate case settlement that occurred during 2010. A regulatory asset was established to reflect the recovery of future increases in taxes payable from customers as the temporary differences reverse. As a result of this regulatory treatment, we continue to record a tax benefit consistent with the flow through method.
**The adjustment was a non-recurring unfavorable true-up attributable to property related deferred income taxes. The removal of the impact of such an adjustment is more appropriately reflective of the effective rate on a recurring basis.


42



The following table reconciles the total amounts of unrecognized tax benefits, without interest, included in Other deferred credits and other liabilities on the accompanying Balance Sheet (in thousands):
2013201220152014
Unrecognized tax benefits at January 1$2,078
$3,595
$1,623
$2,443
Additions for prior year tax positions888
434
Reductions for prior year tax positions(155)(1,586)(247)(1,254)
Additions for current year tax positions520
69


Unrecognized tax benefits at December 31$2,443
$2,078
$2,264
$1,623


41



The reductions for prior year tax positions relate to the reversal through otherwise allowed tax depreciation. The total amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate is approximately $0.50.7 million.

It is our continuing practice to recognize interest and/or penalties related to income tax matters in income tax expense. During the years ended December 31, 20132015 and 2012,2014, the interest expense recognized was not material to our financial results.

In January 2016, the Company reached an agreement in principle with IRS Appeals with respect to research and development tax credits and deductions for tax years 2007 through 2009, and expect a reduction of approximately $0.4 million with respect to our liability for unrecognized tax benefits on or before December 31, 2016.

We file income tax returns in the United States federal jurisdictions as a member of the BHC consolidated group. We do not anticipate that total unrecognized tax benefits will significantly change due to settlement of any audits or the expiration of statutes of limitations prior to December 31, 2014.

At December 31, 20132015, we haveare no longer in a federal NOL carry forward of $14 million, expiring in 2031. Ultimate usage of this NOL depends upon our ability to generate future taxable income, which is expected to occur within the prescribed carryforward period.position.


(7)    COMPREHENSIVE INCOME

The components of the reclassification adjustments for the period, net of tax, included in Other Comprehensive Income were as follows (in thousands):
Derivatives Designated as Cash Flow HedgesAmounts Reclassified from AOCIDerivatives Designated as Cash Flow HedgesAmounts Reclassified from AOCI
 20132012 20152014
Gains and Losses on cash flow hedges    
Interest rate swapsInterest expense$64
$64
Interest rate swaps gain (loss)Interest expense$64
$64
Income taxIncome tax benefit (expense)(23)(23)Income tax benefit (expense)319
(364)
Total reclassification adjustments related to cash flow hedges, net of tax $41
$41
 $383
$(300)
    
Amortization of defined benefit plans:    
Actuarial gain (loss)Operations and maintenance$66
$
Operations and maintenance$94
$45
Income taxIncome tax benefit (expense)(23)
Income tax benefit (expense)(33)(16)
Total reclassification adjustments related to defined benefit plans, net of tax $43
$
 $61
$29

Derivatives designated as cash flow hedges relate to a treasury lock entered into in August 2002 to hedge $50 million of our First Mortgage Bonds due on August 15, 2032. The treasury lock cash settled on August 8, 2002, the bond pricing date, and resulted in a $1.8 million loss. The treasury lock is treated as a cash flow hedge and the resulting loss is carried in Accumulated Other Comprehensive Lossother comprehensive loss and is being amortized over the life of the related bonds.


4243



Balances by classification included within Accumulated other comprehensive loss on the accompanying Balance Sheets were as follows (in thousands):
Derivatives Designated as Cash Flow HedgesInterest Rate SwapsEmployee Benefit PlansTotal
Interest Rate SwapsEmployee Benefit PlansTotal 
 
As of December 31, 2012$(760)$(660)$(1,420)
As of December 31, 2014$(1,018)$(801)$(1,819)
Other comprehensive income (loss)41
182
223
383
129
512
As of December 31, 2013$(719)$(478)$(1,197)
As of December 31, 2015$(635)$(672)$(1,307)
  
Derivatives Designated as Cash Flow Hedges 
Interest Rate SwapsEmployee Benefit PlansTotalInterest Rate SwapsEmployee Benefit PlansTotal
  
As of December 31, 2011$(801)$(489)$(1,290)
As of December 31, 2013$(719)$(478)$(1,197)
Other comprehensive income (loss)41
(171)(130)(299)(323)(622)
As of December 31, 2012$(760)$(660)$(1,420)
As of December 31, 2014$(1,018)$(801)$(1,819)


(8)    EMPLOYEE BENEFIT PLANS

Funded Status of Benefit Plans

The funded status of the postretirement benefit plan is required to be recognized in the statement of financial position. The funded status for the pension plan is measured as the difference between the projected benefit obligation and the fair value of plan assets. The funded status for all other benefit plans is measured as the difference between the accumulated benefit obligation and the fair value of plan assets. A liability is recorded for an amount by which the benefit obligation exceeds the fair value of plan assets or an asset is recorded for any amount by which the fair value of plan assets exceeds the benefit obligation. The measurement date of the plans is December 31, our year-end balance sheet date. As of December 31, 20132015, the unfunded status of our Defined Benefit Pension Plan was $3.8$11 million,, the unfunded status of our Supplemental Non-qualified Defined Benefit Plans was $3.1$3.4 million and the unfunded status of our Non-pension Defined Benefit Postretirement Healthcare Plans was $5.9 million.$6.2 million.

We apply accounting standards for regulated operations, and accordingly, the unrecognized net periodic benefit cost that would have been reclassified to Accumulated other comprehensive income (loss) was alternatively recorded as a regulatory asset or regulatory liability, net of tax.

Defined Benefit Pension Plan

We have a noncontributory defined benefit pension plan (“Pension Plan”) covering employees who meet certain eligibility requirements.eligible employees. The benefits are based on years of service and compensation levels duringfor the highest five consecutive years of the last ten years of service. Our funding policy is in accordance with the federal government’s funding requirements. The Pension Plan’s assets are held in trust and consist primarily of equity and fixed income investments.

The Pension Plan has been frozen to new employees and certain employees who did not meet age and service based criteria at the time the Plan was frozen. Plan benefits are based on years of service and calculations of average earnings during a specific time period prior to retirement. The Pension Plan has been closed to new employees and certain employees who did not meet age and service based criteria.

As of December 31, 2012, certainPension Plan investments were transferred toassets are held in a Master Trust that was established for the investment of assets of the Plan and other Employer-sponsored retirement plans. Each participating retirement plan has an undivided interest in the Master Trust.


43



On October 29, 2012, theThe BHC Board of Directors have approved a new Investment Policy.the Plans’ investment policy. The objective of the Investment Policyinvestment policy is to manage assets in such a way that will allow the eventual settlement of our obligations to the Pension Plans’ beneficiaries. To meet this objective, our pension plan assets are managed by an outside adviser using a portfolio strategy that will provide liquidity to meet the Plans’ benefit payment obligations and an asset allocation that will comprise a mix of return-seeking and liability-hedging assets. Our Pension Plan funding policy is in accordance with the federal government’s funding requirements.obligations. The Pension Plan’sPlans’ assets are held in trust and consist primarily of equity, fixed income and hedged investments. The expected long-term rate of return for investments was 7.25%6.75% and 7.25%6.75% for the 20132015 and 20122014 plan years, respectively. Our Pension Plan funding policy is in accordance with the federal government’s funding requirements.


44



Pension Plan Assets

The percentages of total plan asset fair value by investment category of our Pension Plan assets at December 31 were as follows:
2013201220152014
Equity securities26%51%26%27%
Real estate4%%5
5
Fixed income funds58%48%59
58
Cash and cash equivalents1%1%1
2
Hedge funds11%%9
8
Total100%100%100%100%

Supplemental Non-qualified Defined Benefit Retirement Plans

We have various supplemental retirement plans (“Supplemental Plans”) for key executives. The Supplemental Plans are non-qualified defined benefit plans. The Supplemental Plans are subject to various vesting schedules.

Supplemental Plan Assets

We do not fund our Supplemental Plans. We fundPlans on a cash basis as benefits are paid.

Non-pension Defined Benefit Postretirement Healthcare Plan

Employees who are participants in our Non-Pension Postretirement Healthcare Plan (“Healthcare Plan”) and who retire on or after attaining minimum age and years of service requirements are entitled to postretirement healthcare benefits. These benefits are subject to premiums, deductibles, co-payment provisions and other limitations. We may amend or change the Healthcare Plan periodically. We are not pre-funding our retiree medical plan. We have determined that the Healthcare Plan’s post-65 retiree prescription drug plans are actuarially equivalent and qualify for the Medicare Part D subsidy.

Plan Assets

We do not fund our Healthcare Plans. We fundPlans on a cash basis as benefits are paid.


44



Plan Contributions and Estimated Cash Flows

Contributions made to the Pension PlansCash contributions for pension plans are cash contributions made directly to the Pension Plan Trust accounts. Healthcare and Supplemental Plan contributions are made in the form of benefit payments. Contributions for the years ended December 31 were as follows (in thousands):
2013201220152014
Defined Benefit Plans  
Defined Benefit Pension Plan$2,299
$6,835
$
$1,696
Non-pension Defined Benefit Postretirement Healthcare Plan$578
$835
$267
$399
Supplemental Non-qualified Defined Benefit Plan$217
$256
$211
$217
  
Defined Contribution Plans  
Company Retirement Contribution$421
$404
$811
$638
Matching Contributions$1,301
$1,328
$1,423
$1,377

We doAlthough we are not intendrequired we expect to make a contributioncontribute approximately $1.6 million to our employee defined benefit pension planDefined Benefit Pension Plan in 2014.2016.


45



Fair Value Measurements

As required by accounting standards for fair value measurements, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect their placement within the fair value hierarchy levels. The following tables set forth, by level within the fair value hierarchy, the assets that were accounted for at fair value on a recurring basis as of December 31 (in thousands):
Defined Benefit Pension Plan2013
 Level 1Level 2Level 3Total Fair Value
AXA Equitable General Fixed Income$
$213
$
$213
Common Collective Trust - Cash and Cash Equivalents
252

252
Common collective trust - equity
14,833

14,833
Common collective trust - fixed income
32,742

32,742
Common collective trust - real estate
682
1,718
2,400
Hedge funds

5,965
5,965
Total investments measured at fair value$
$48,722
$7,683
$56,405
Defined Benefit Pension Plan2015
 Level 1Level 2Level 3Total Fair Value
Common Collective Trust - Cash and Cash Equivalents$
$498
$
$498
Common Collective Trust - Equity
14,198

14,198
Common Collective Trust - Fixed Income
32,615

32,615
Common Collective Trust - Real Estate
418
2,113
2,531
Hedge Funds

4,881
4,881
Total investments measured at fair value$
$47,729
$6,994
$54,723

Defined Benefit Pension Plan2012
 Level 1Level 2Level 3Total Fair Value
Cash and cash equivalents$535
$
$
$535
Common collective trust - equity
27,267

27,267
Common collective trust - fixed income
21,127

21,127
Structured products
4,536

4,536
Total investments measured at fair value$535
$52,930
$
$53,465
Defined Benefit Pension Plan2014
 Level 1Level 2Level 3Total Fair Value
Common Collective Trust - Cash and Cash Equivalents$
$899
$
$899
Common Collective Trust - Equity
16,107

16,107
Common Collective Trust - Fixed Income
34,474

34,474
Common Collective Trust - Real Estate
761
1,918
2,679
Hedge Funds

4,939
4,939
Total investments measured at fair value$
$52,241
$6,857
$59,098


45



Cash and Cash Equivalents: This category is comprised of the AXA Equitable General Fixed Income Fund wandand Common Collective Trusts - cash and cash equivalents. The AXA Equitable General Fixed Income Fund is a fund of diversified portfolios, primarily composed of fixed income instruments. Assets are invested in long-term holdings, such as commercial, agricultural and residential mortgages, publicly traded and privately place bonds and real estate as well as short-term bonds. Fair values of mortgage loans are measured by discounting future contractual cash flows to be received on the mortgage loans using interest rates at which loans with similar characteristics.characteristics have. The discount rate is derived from taking the appropriate U.S. Treasury rate with a like term. The fair value of public fixed maturity securities are generally based on prices obtained from independent valuation service providesproviders with reasonableness prices compared with directly observable market trades. The fair value of privately placed securities are determined using a discounted cash flow model. These models use observable inputs with a discount rate based upon the average of spread surveys collected from private market intermediaries and industry sector of the issuer.

Common Collective Trust: The PensionThese funds are valued based upon the redemption price of units held by the Plan, owns unitswhich is based on the current fair value of the Common Collective Trust funds that theycommon collective trust funds’ underlying assets. Unit values are utilizing in their portfolio. The value of each unit of any fund as of any valuation date shall be determined by calculating the totalfinancial institution sponsoring such funds by dividing the fund’s net assets at fair value by its units outstanding at the valuation dates. The Plan’s investments in common collective trust funds, with the exception of such fund’s assets asshares of the close of business on such valuation date, deducting its total liabilitiescommon collective trust-real estate are categorized as of such time and date, and then dividing the so-determined net asset value of such fund by the total number of units of such fund outstanding on the date of valuation.Level 2.

Common Collective Trust-RealTrust - Real Estate Fund: This fund is valued based on various factors of the underlying real estate properties, including market rent, market rent growth, occupancy levels, etc. As part of the trustee’s valuation process, properties are externally appraised generally on an annual basis. The appraisals are conducted by reputable independent appraisal firms and signed by appraisers that are members of the Appraisal Institute, with professional designation of Member, Appraisal Institute. All external appraisals are performed in accordance with the Uniform Standards of Professional Appraisal Practices. We receive monthly statements from the trustee, along with the annual schedule of investments, and rely on these reports for pricing the units of the fund. Certain of the funds’ assets contain participant withdrawal policy and, therefore, are categorized as Level 3. The funds without participant withdrawal limitations are categorized as Level 2.


46



Hedge Funds: Hedge funds represent investments in other investment funds that seek a return utilizing a number of diverse investment strategies. The strategies, when combined aim to reduce volatility and risk while attempting to deliver positive returns under all market conditions. Amounts are reported on a one-month lag. The fair value of hedge funds is determined using net asset value per share based on the fair value of the hedge fund’s underlying investments. Generally, shares may be redeemed at the end of each quarter after a lockup period of one-year, with a 65 day notice and isare limited to a percentage of total net asset value of the fund. The net asset values are based on the fair value of each fund’s underlying investments. There are no unfunded commitments related to these hedge funds.
Structured Products: Investments are created through The Plan’s investment in the process of financial engineering (thathedge fund is by combining underlying securities like equity, bonds, or indices with derivatives). The value of derivative securities, suchcategorized as options, forwards and swaps is determined by (respectively, derives from) the prices of the underlying securities.Level 3.

The following table sets forth a summary of changes in the fair value of the Defined Benefit Pension Plans’ Level 3 assets for the period ended December 31 (in thousands):
20132015
Balance, beginning of period$
$6,857
Transfers1,550
Purchase5,834
93
Unrealized gain (loss)317
63
Realized gain (loss)(3)
Settlements(15)(19)
Balance, end of period$7,683
$6,994


46



The following table presents the quantitative information about Level 3 fair value measurements (dollars in thousands):
Fair Value atValuationLevel 3Range (Weighted)Fair Value atValuationLevel 3Range (Weighted)
December 31, 2013TechniqueInputAverageDecember 31, 2015TechniqueInputAverage
Assets:    
Common Collective Trust - Real Estate (a)
$1,718
Market ApproachRedemption RestrictionN/A$2,113
Market ApproachRedemption RestrictionN/A
Hedge Funds (b)
$5,965
Market ApproachRedemption RestrictionN/A$4,881
Market ApproachRedemption RestrictionN/A
_____________
(a)The underlying net asset value in the Common Collective Trust - Real Estate fund is determined by appraisal of the properties held in the Trust. As part of the Trustee's valuation process, properties are externally appraised generally on an annual basis. The appraisals are conducted by reputable independent appraisal firms and signed by appraisers that are members of the Appraisal Institute, with the professional designation of Member, Appraisal Institute. All external appraisals are performed in accordance with the Uniform Standards of Professional Appraisal Practices. We receive monthly statements from the Trustee along with the annual schedule of investments and rely on these reports for pricing the units of the fund. The fund does contain a participant withdrawal policy.
(b)The fair value of Level 3the Hedge Funds is determined based on pricing provided or reviewed by third-party administrator to our investment managers. While the input amounts used by the pricing vendor in determining fair value are not provided, and therefore, unavailable for our review, the asset results are reviewed and monitored to ensure the fair values are reasonable and in line with market experience in similar asset classes. Additionally, the audited financial statements of the funds will beare reviewed at the timeannually as they are issued.


47



Plan Reconciliations

The following tables provide a reconciliation of the Employee Benefit Plan’s obligations and fair value of assets, components of the net periodic expense and elements of regulatory assets and liabilities and AOCI (in thousands):

Benefit Obligations
Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare PlanDefined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
201320122013201220132012201520142015201420152014
Change in benefit obligation:  
Projected benefit obligation at beginning of year$69,820
$65,557
$3,427
$2,292
$6,766
$8,207
$71,178
$60,223
$3,599
$3,131
$6,038
$5,850
Service cost852
765


216
214
797
704


233
222
Interest cost2,969
2,969
133
104
239
343
2,956
2,991
142
146
214
241
Actuarial loss (gain)(7,818)4,510
(212)1,287
(459)(1,748)(5,650)11,879
(104)540
27
115
Amendments (a)




(342)
Benefits paid(4,850)(2,850)(217)(256)(1,045)(835)(3,284)(4,452)(211)(218)(387)(488)
Asset transfer (to) from affiliate(750)(1,131)

(75)26
(38)(167)

(7)24
Plan curtailment reduction





Medicare Part D adjustment



82
71




(30)(15)
Plan participants’ contributions



468
488




120
89
 
Projected benefit obligation at end of year$60,223
$69,820
$3,131
$3,427
$5,850
$6,766
$65,959
$71,178
$3,426
$3,599
$6,208
$6,038
_______________
(a)Reflects Board of Directors approval of increase to Company’s contribution to RMSA account.


47



A reconciliation of the fair value of Plan assets (as of the December 31 measurement date) is as follows (in thousands):
Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare PlanDefined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
201320122013201220132012201520142015201420152014
Beginning market value of plan assets$53,465
$45,017
$
$
$
$
$59,098
$56,405
$
$
$
$
Investment income6,070
5,240




(1,057)5,462




Benefits paid(4,850)(2,850)



(3,284)(4,452)(211)
(387)
Participant contributions



120

Employer contributions2,299
6,835





1,696
211

267

Asset transfer to affiliate(579)(777)



(34)(13)



Ending market value of plan assets$56,405
$53,465
$
$
$
$
$54,723
$59,098
$
$
$
$

Amounts recognized in the Balance Sheets at December 31 consist of (in thousands):
 Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Plan
 201320122013201220132012
Regulatory asset (liability)$13,735
$26,683
$
$
$2,781
$(2,174)
Current (liability)$
$
$(216)$(216)$(491)$(438)
Non-current (liability)$(3,818)$(16,356)$(2,915)$(3,211)$(5,372)$(6,321)

Accumulated Benefit Obligation (dollars in thousands)
 Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
 201320122013201220132012
Accumulated benefit obligation$55,283
$63,417
$3,131
$3,427
$5,850
$6,766

Components of Net Periodic Expense (dollars in thousands)
 Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
 201320122011201320122011201320122011
Service cost$852
$765
$798
$
$
$
$216
$214
$210
Interest cost2,969
2,969
3,092
133
104
114
239
343
365
Expected return on assets(3,764)(3,139)(3,619)





Amortization of prior service cost (credits)43
57
62



(278)(278)(314)
Amortization of transition obligation2,609








Recognized net actuarial loss (gain)
2,599
1,486
66
55
48
9
139
163
Curtailment expense








Net periodic expense$2,709
$3,251
$1,819
$199
$159
$162
$186
$418
$424
 Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Plan
 201520142015201420152014
Regulatory asset (liability)$19,816
$22,717
$
$
$(1,946)$2,306
Current liability$
$
$(216)$(217)$(619)$(519)
Non-current liability$(11,236)$(12,080)$(3,210)$(3,382)$(5,587)$(5,519)


48



Accumulated Benefit Obligation (in thousands)
 Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
 201520142015201420152014
Accumulated benefit obligation$62,240
$65,699
$3,426
$3,599
$6,208
$6,038

Components of Net Periodic Expense (in thousands)
 Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
 201520142013201520142013201520142013
Service cost$797
$704
$852
$
$
$
$233
$222
$216
Interest cost2,956
2,991
2,969
142
146
133
214
241
239
Expected return on assets(3,935)(3,702)(3,764)





Amortization of prior service cost (credits)43
43
43



(336)(335)(278)
Amortization of transition obligation

2,609






Recognized net actuarial loss (gain)2,196
940

93
45
66


9
Net periodic expense$2,057
$976
$2,709
$235
$191
$199
$111
$128
$186

Accumulated Other Comprehensive Income (Loss)

Amounts included in AOCI, after-tax, that have not yet been recognized as components of net periodic benefit cost at December 31 were as follows (in thousands):
Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare PlanDefined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
201320122013201220132012201520142015201420152014
Net loss$
$
$(479)$(660)$
$
$
$
$673
$(801)$
$
Prior service cost











 
Total accumulated other comprehensive income (loss)$
$
$(479)$(660)$
$
$
$
$673
$(801)$
$

The amounts in AOCI, regulatory assets or regulatory liabilities, after-tax, expected to be recognized as a component of net periodic benefit cost during calendar year 20142016 wereare as follows (in thousands):
 Defined Benefits Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
Net loss$611
$29
$
Prior service cost28

(206)
Total net periodic benefit cost expected to be recognized during calendar year 2014$639
$29
$(206)
 Defined Benefits Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
Net gain (loss)$1,297
$53
$
Prior service cost28

(218)
Total net periodic benefit cost expected to be recognized during calendar year 2016$1,325
$53
$(218)


49



Assumptions
Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare PlanDefined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
201320122011201320122011201320122011201520142013201520142013201520142013
Weighted-average assumptions used to determine benefit obligations:  
Discount rate5.10%4.35%4.65%4.68%4.25%4.70%4.45%3.65%4.35%4.63%4.25%5.10%4.29%3.98%4.68%4.03%3.70%4.45%
Rate of increase in compensation levels3.86%3.91%3.67%N/A
N/A
N/A
N/A
N/A
N/A
3.57%3.86%3.86%N/A
N/A
N/A
N/A
N/A
N/A
  
Weighted-average assumptions used to determine net periodic benefit cost for plan year:  
Discount rate4.35%4.65%5.50%3.88%4.70%5.00%3.65%4.35%5.00%4.25%5.10%4.35%3.98%4.68%3.88%3.70%4.45%3.65%
Expected long-term rate of return on assets*7.25%7.25%7.75%N/A
N/A
N/A
N/A
N/A
N/A
Expected long-term rate of return on assets (a)
6.75%6.75%7.25%N/A
N/A
N/A
N/A
N/A
N/A
Rate of increase in compensation levels3.91%3.67%3.70%N/A
N/A
N/A
N/A
N/A
N/A
3.86%3.86%3.91%N/A
N/A
N/A
N/A
N/A
N/A
_____________________________
*(a)
The expected rate of return on plan assets is 6.75% for the calculation of the 20142016 net periodic pension cost.


49



The healthcare benefit obligation was determined at December 31 as follows:
2013201220152014
Healthcare trend rate pre-65  
Trend for next year7.50%7.75%6.35%7.50%
Ultimate trend rate4.50%4.50%4.50%4.50%
Year Ultimate Trend Reached2027
2027
2024
2027
  
Healthcare trend rate post-65  
Trend for next year6.25%6.50%5.20%6.25%
Ultimate trend rate4.50%4.50%4.50%4.50%
Year Ultimate Trend Reached2026
2026
2023
2024

We do not pre-fund our post-retirement benefit plan. The table below shows the estimated impacts of an increase or decrease to our healthcare trend rate for our Retiree Health Care Plan (dollars in(in thousands):
Change in Assumed Trend RateService and Interest CostsAccumulated Periodic Postretirement Benefit ObligationService and Interest CostsAccumulated Periodic Postretirement Benefit Obligation
1% increase$9
$179
$10
$221
1% decrease$(9)$(165)$(1)$(205)


50




Beginning in 2016, the company will change the method used to estimate the service and interest cost components of the net periodic pension, supplemental non-qualified defined benefit and other postretirement benefit costs. The new method uses the spot yield curve approach to estimate the service and interest costs by applying the specific spot rates along the yield curve used to determine the benefit obligations to relevant projected cash outflows. Previously, those costs were determined using a single weighted-average discount rate. The change does not affect the measurement of the total benefit obligations as the change in service and interest costs offsets the actuarial gains and losses recorded in other comprehensive income. The new method provides a more precise measure of interest and service costs by improving the correlation between the projected benefit cash flows and the discrete spot yield curve rates. The company will account for this change as a change in estimate prospectively beginning in the first quarter of 2016. See "Pension and Postretirement Benefit Obligations" within our Critical Accounting Policies in Item 7 on Form 10-K for additional details.

The following benefit payments, which reflect future service, are expected to be paid (in thousands):

Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare PlanDefined Benefit Pension PlanSupplemental Non-qualified Defined Benefit Retirement PlansNon-pension Defined Benefit Postretirement Healthcare Plan
2014$3,177
$217
$491
2015$3,227
$214
$432
2016$3,270
$184
$410
$3,492
$216
$619
2017$3,367
$213
$418
$3,594
$248
$618
2018$3,483
$210
$473
$3,677
$246
$613
2019-2023$20,002
$1,271
$2,483
2019$3,814
$243
$607
2020$3,911
$240
$621
2021-2025$21,108
$1,583
$2,841

Defined Contribution Plan

The Parent sponsors a 401(k) retirement savings plan in which our employees may participate. Participants may elect to invest up to 50% of their eligible compensation on a pre-tax or after-tax basis, up to a maximum amount established by the Internal Revenue Service. The plan provides for company matching contributions and company retirement contributions. Employer contributions vest at 20% per year and are fully vested when the participant has 5 years of service.


(9)    RELATED-PARTY TRANSACTIONS

Non-Cash Dividend to Parent

We haveIn 2015, we recorded a non-cash dividend to our Parent for approximately $8.0$28.5 million and $44 million in 2013 and 2012 and decreased the utility money pool note receivable, net for approximately $8.0 million and $44 million, in 2013 and 2012 respectively.$28.5 million. No amounts were recorded for 2014.

50



Receivables and Payables

We have accounts receivable and accounts payable balances related to transactions with other BHC subsidiaries. These balances as of December 31 were as follows (in thousands):
2013201220152014
Receivable - affiliates$4,934
$5,027
$5,747
$5,350
Accounts payable - affiliates$21,082
$21,896
$30,032
$19,242

Money Pool Notes Receivable and Notes Payable

We have a Utility Money Pool Agreement (the Agreement) with BHC, Cheyenne Light and Black Hills Energy.Utility Holdings. Under the agreement, we may borrow from BHC however the Agreement restricts us from loaning funds to BHC or to any of BHCs’ non-utility subsidiaries. The Agreement does not restrict us from making dividends to BHC. Borrowings under the agreement bear interest at the weighted average daily cost of our parent company’s credit facility borrowings as defined under the Agreement, or if there are no external funds outstanding on that date, then the rate will be the daily one month LIBOR rate plus 1.0%.

The cost of borrowing under the Utility Money Pool was 1.60%1.45% at December 31, 20132015.

We had the following balances with the Utility Money Pool as of December 31 (in thousands):
 20132012
Notes receivable (payable), net$17,292
$31,645
 20152014
Notes receivable (payable), net$76,813
$68,626

Net interest income (expense) relating to the Utility Money Pool for the years ended December 31, was as follows (in thousands):
 201320122011
Net interest income (expense)$505
$617
$1,414
 201520142013
Net interest income (expense)$1,153
$304
$505

Other Balances and Transactions

We have the following Power Purchase and Transmission Services Agreements with affiliated entities:

An agreement, expiring September 3, 2028, with Cheyenne Light entered into a PPA withto acquire 15 MW of the facility output from Happy Jack. Under a separate inter-company agreement expiring on September 3, 2028, Cheyenne Light has agreed to sell up to 15 MW of the facility output from Happy Jack to us.

An agreement, expiring September 30, 2029, with Cheyenne Light entered into a PPA withto acquire 20 MW of the facility output from Silver Sage. Under a separate inter-company agreement expiring on September 30, 2029, Cheyenne Light has agreed to sell 20 MW of energy from Silver Sage to us.

A Generation Dispatch Agreement with Cheyenne Light that requires us to purchase all of Cheyenne Light’s excess energy.


51Related-party Gas Transportation Service Agreement


On October 1, 2014, we entered into a gas transportation service agreement with Cheyenne Light in connection with gas supply for Cheyenne Prairie. The agreement is for a term of 40 years, in which we pay a monthly service and facility fee for firm and interruptible gas transportation.

We had the following related party transactions for the years ended December 31 included in the corresponding captions in the accompanying Statements of Income:
201320122011201520142013
(in thousands)(in thousands)
Revenues:  
Energy sold to Cheyenne Light$1,338
$2,372
$957
$1,857
$1,894
$1,338
Rent from electric properties$3,627
$2,661
$7,523
$4,772
$4,102
$3,627
  
Purchases:  
Purchase of coal from WRDC$18,542
$20,690
$21,319
$16,401
$16,861
$18,542
Purchase of excess energy from Cheyenne Light$3,640
$3,139
$4,127
$898
$3,033
$3,640
Purchase of renewable wind energy from Cheyenne Light - Happy Jack$1,886
$1,988
$1,955
$1,578
$1,959
$1,886
Purchase of renewable wind energy from Cheyenne Light - Silver Sage$3,207
$3,269
$3,281
$2,739
$3,200
$3,207
Corporate support services from Parent, Black Hills Service Company and Black Hills Utility Holdings$30,738
$24,163
$18,567
$26,655
$32,332
$30,738



51



(10)    SUPPLEMENTAL CASH FLOW INFORMATION

Years ended December 31,201320122011201520142013
(in thousands)(in thousands)
Non-cash investing and financing activities -  
Property, plant and equipment acquired with accrued liabilities$13,590
$3,969
$1,882
$3,870
$4,234
$13,590
Non-cash decrease to money pool note receivable, net$(8,000)$(43,984)$
$(28,501)$
$(8,000)
Non-cash dividend to Parent company$8,000
$43,984
$
$28,501
$
$8,000
  
Supplemental disclosure of cash flow information:  
Cash (paid) refunded during the period for -  
Interest (net of amounts capitalized)$(19,174)$(17,099)$(16,294)$(21,913)$(19,573)$(19,174)
Income taxes$219
$7,176
$(15,347)$
$
$219


(11)    COMMITMENTS AND CONTINGENCIES

Power Purchase and Transmission Services Agreements

We have the following power purchase and transmission agreements, not including related party agreements, as of December 31, 20132015 (see Note 9 for information on related party agreements):

A PPA with PacifiCorp expiring on December 31, 2023, which provides for the purchase by us of 50 MW of electric capacity and energy.energy from PacifiCorp’s system. The price paid for the capacity and energy is based on the operating costs of one of PacifiCorp’s coal-fired electric generating plants;

A firm point-to-point transmission access agreement to deliver up to 50 MW of power on PacifiCorp’s transmission system to wholesale customers in the western region through December 31, 2023; and

An agreement with Thunder Creek for gas transport capacity, expiring in October 31, 2019.


52



Costs incurred under these agreements were as follows for the years ended December 31 (in thousands):

ContractContract Type201320122011Contract Type201520142013
PacifiCorpElectric capacity and energy$13,026
$13,224
$12,515
Electric capacity and energy$13,990
$13,943
$13,026
PacifiCorpTransmission access$1,384
$1,215
$1,215
Transmission access$1,213
$1,227
$1,384
Thunder CreekGas transport capacity$633
$633
$633
Gas transport capacity$633
$633
$633

Future Contractual Obligations

The following is a schedule of future minimum payments required under the power purchase, transmission services, facility and vehicle leases, and gas supply agreements (in thousands):

2014$12,451
2015$12,443
2016$12,443
$12,827
2017$12,443
$12,824
2018$6,133
$6,513
2019$6,408
2020$5,880
Thereafter$28,764
$17,641


52



Long-Term Power Sales Agreements

We have the following power sales agreements as of December 31, 20132015:

DuringAn agreement with MDU to supply up to a maximum of 25 MW on a cost reimbursement basis during periods of reduced production at Wygen III in which MDU owns a portion of the capacity, or during periods when Wygen III is off-line, MDU will be provided with 25 MW from our other generation facilities or from system purchases with reimbursement of costs by MDU;
III;

A capacity and energy agreement with MDU through December 31, 2023 to supply up to a maximum of 50 MW;
During
An agreement with the City of Gillette to supply its first 23 MW on a cost reimbursement basis during periods of reduced production at Wygen III in which the City of Gillette owns a portion of the capacity, or during periods when Wygen III is off-line, we will provide the City of Gillette with its first 23 MW from our other generating facilities or from system purchases with reimbursement of costs by the City of Gillette.III. Under this agreement, Black Hills Powerwe will also provide the City of Gillette their operating component of spinning reserves;

An agreement under which we supplyA unit-contingent energy and capacity tosales agreement with MEAN expiring on May 31, 2023. This contract is unit-contingent based on up to 10 MW from our Neil Simpson II and up to 10 MW from our Wygen III based on the availability of these plants. The energy and capacity purchase requirements decrease over the term of the agreement; and

A PPA with MEAN, expiring May 31, 2023. This contract is unit-contingent on April 1, 2015. Under this contract, MEAN purchases 5up to 10 MW of unit-contingent energy and capacity from Neil Simpson II and 5up to 10 MW of unit-contingent capacity from Wygen III.
III based on the availability of these plants. The capacity purchase requirements decrease over the term of the agreement.

Oil Creek Fire
On June 29, 2012, a forest and grassland fire occurred in the western Black Hills of Wyoming. A fire investigator concluded that the fire was caused by the failure of a transmission structure owned, operated and maintained by us. On April 16, 2013, thirty-five private partieslandowners filed suit in the United States District Court for the District of Wyoming asserting claims for damages against us based upon allegationsthat the fire was caused by Black Hills Power’s negligent maintenance of negligence, negligence per se, common law nuisance, and trespass. Although not currently included in the lawsuit, we also received written damage claims from an additional landowner and from the State of Wyoming. Altogether the claims seeka transmission line. The Company denied these claims. These landowners sought recovery for fire suppression, reclamation and rehabilitation costs, damage to fencing and other personal property, alleged injury to timber, grass or hay, livestock and related operations, and diminished value of real estate, for a current total amountestate. The State of $15 million. In addition toWyoming intervened in the lawsuit, asserting claims for fire suppression costs, and similar damage claims related to state-owned lands. As of December 31, 2015, we believed that a loss associated with settlement of pending claims was probable. Accordingly, we had recorded a loss contingency liability related to these compensatory damages, the lawsuit seeksclaims and a receivable for costs we believed were reimbursable and probable of recovery of punitive damages. Our investigationunder our insurance coverage. In consideration of the causerisk and origin of the fire is ongoing. We have denied and will vigorously defend all claims arising out of the fire, pending the completion of our investigation. Given the uncertainty of litigation, however,the Company subsequently concluded a loss relatedsettlement of all claims, with all parties to the fire,litigation. On January 4, 2016, the court entered its order dismissing the litigation and related claims, is reasonably possible. We cannot reasonably estimate the amount of a potential loss because our investigation is ongoing, and because damage claims are currently incomplete or undocumented. Further claims may be presented by these and other parties. We cannot predict the outcome of our investigation, the viability of alleged claims or the outcomewith prejudice. The resolution of the litigation. Based upon information currently available, however, management doesState and private claims did not expect the claims, if determined adversely to us, to have a material adverse effect upon our consolidated financial condition, results of operations or cash flows.

53




Legal Proceedings

WeIn the normal course of business, we are subject to various lawsuits, actions, proceedings, claims and other matters asserted under laws and regulations. We believe the amounts provided in the consolidated financial statements to satisfy alleged liabilities are adequate in light of the probable and estimable contingencies. However, there can be no assurance that the actual amounts required to satisfy alleged liabilities from various legal proceedings, claims and litigation which ariseother matters discussed, and to comply with applicable laws and regulations will not exceed the amounts reflected in the ordinary course of operations. In the opinion of management, the amount of liability, if any, with respect to these actions would not materially affect ourconsolidated financial position, results of operations or cash flows.statements.

In the normal course of business, we enter into agreements that include indemnification in favor of third parties, such as information technology agreements, purchase and sale agreements and lease contracts. We have also agreed to indemnify our directors, officers and employees in accordance with our articles of incorporation, as amended. Certain agreements do not contain any limits on our liability and therefore, it is not possible to estimate our potential liability under these indemnifications. In certain cases, we have recourse against third parties with respect to these indemnities. Further, we maintain insurance policies that may provide coverage against certain claims under these indemnities.


53



Environmental Matters

We are subject to costs resulting from a number of federal, state and local laws and regulations which affect future planning and existing operations. They can result in increased capital expenditures, operating and other costs as a result of compliance, remediation and monitoring obligations. Due to the environmental issues discussed below, we may be required to modify, curtail, replace or cease operating certain facilities or operations to comply with statutes, regulations and other requirements of regulatory bodies.

Air

Our generation facilities are subject to federal, state and local laws and regulations relating to the protection of air quality. These laws and regulations cover, among other pollutants, carbon monoxide, SO2, NOx, mercury particulate matter and GHG. Power generating facilities burning fossil fuels emit each of the foregoing pollutants and, therefore, are subject to substantial regulation and enforcement oversight by various governmental agencies.

Title IV of the Clean Air Act applies to several of our generation facilities, including the Neil Simpson II, Neil Simpson CT, II, Lange CT, Wygen III and Wyodak plants. Title IV of the Clean Air Act created an SO2 allowance trading program as part of the federal acid rain program. Without purchasing additional allowances, we currently hold sufficient allowances to satisfy Title IV at all such plants through 2042.2045.

The EPA issued the Industrial and Commercial Boiler Regulations for Area Sources of Hazardous Air Pollutants, with updates which impose emission limits, fuel requirements and monitoring requirements. The rule hashad a compliance deadline of March 21, 2014. In anticipation of this rule, we suspended operations at the Osage plant on October 1, 2010 and as a result of this rule, we suspended operations at the Ben French facility on August 31, 2012 with plans to retire Osage,2012. We permanently retired Ben French, Osage and Neil Simpson I on or before March 21, 2014. While theThe net book value of these plants was allowed regulatory accounting treatment and is estimated to be insignificant atrecorded as a Regulatory Asset on the time of retirement, we would reasonably expect any remaining value to be recovered through future rates.accompanying Balance Sheets.

Solid Waste Disposal

Various materials used at our facilities are subject to disposal regulations. Our Osage plant, at which operations have been suspended, haspermanently retired on March 21, 2014, had an on-site ash impoundment that iswas near capacity. An application to close the impoundment was approved by the State of Wyoming on April 13, 2012. Site closure work was completed in 2013 and postwith the state providing closure certification in 2014. Post closure monitoring activities will continue for 30 years.

In September 2013, Osage also received a permit to close the small industrial rubble landfill. Site work was completed and postwith the state providing closure certification in 2014. Post closure monitoring will continue for 30 years.



54




(12)    QUARTERLY HISTORICAL DATA (Unaudited)

We operate on a calendar year basis. The following table sets forth selected unaudited historical operating results data for each quarter (in thousands):
First
Quarter
Second
Quarter
Third
Quarter
Fourth
Quarter
First
Quarter
Second
Quarter
Third
Quarter
Fourth
Quarter
2013 
2015 
Operating revenues$59,817
$60,832
$67,268
$66,110
$70,283
$68,038
$72,111
$67,432
Operating income$12,503
$14,293
$18,704
$16,844
$21,490
$21,143
$23,456
$21,825
Net income$5,582
$6,652
$9,298
$8,641
$10,403
$10,547
$12,287
$11,937
  
2012 
2014 
Operating revenues$62,270
$58,372
$61,134
$61,533
$71,267
$60,741
$67,729
$68,751
Operating income$12,742
$13,859
$15,361
$15,619
$17,546
$13,782
$19,007
$18,779
Net income$6,053
$6,727
$8,147
$6,159
$8,643
$6,230
$9,916
$8,773


54



ITEM 9.CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE

None.


ITEM 9A.    CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our Chief Executive Officer and Chief Financial Officer evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934 (Exchange Act)) as of December 31, 20132015. Based on their evaluation, they have concluded that our disclosure controls and procedures are effective.

Changes in Internal Control over Financial Reporting

Management’s Report on Internal Control over Financial Reporting is presented on Page 2425 of this Annual Report on Form 10-K.

During our fourth fiscal quarter, there have been no changes in our internal controls over financial reporting that have materially affected or are reasonably likely to materially affect our internal controls over financial reporting.

55



ITEM 9B.    OTHER INFORMATION

None.


ITEM 14.    PRINCIPAL ACCOUNTING FEES AND SERVICES

The following table sets forth the aggregate fees for services provided to us for the fiscal years ended December 31 by our independent registered public accounting firm, Deloitte & Touche LLP (in thousands):
Deloitte & Touche LLP2013201220152014
Audit Fees$345
$128
$360
$337
Tax Fees4
94
16
7
Audit-related fees



Total$349
$222
$376
$344

Audit Fees. Fees for professional services rendered for the audits of our financial statements, review of the interim financial statements included in quarterly reports and services that generally only the independent auditor can reasonably provide, such as comfort letters, statutory audits, consents and assistance with and review of documents filed with the Securities and Exchange Commission.

Tax Fees. Fees for services related to tax compliance, and tax planning and advice including tax assistance with tax audits. These services include assistance regarding federal and state tax compliance and advice, review of tax returns, and federal and state tax planning.

Audit-Related Fees. Fees for assurance and related services that are reasonably related to the performance of the audit or review of our financial statements and are not reported under “Audit Fees.” These services may include internal control reviews; attest services that are not required by statute or regulation; employee benefit plan audits; due diligence, consultations and audits related to mergers and acquisitions; and consultations concerning financial accounting and reporting standards.

The services performed by Deloitte & Touche LLP were pre-approved in accordance with the Black Hills Corporation Audit Committee’s pre-approval policy whereby the Audit Committee pre-approves all audit and permissible non-audit services provided by the independent registered public accountants. The Audit Committee annually reviews the services expected to be provided by the independent auditors and establishes pre-approval fee levels for each category of services to be provided, including audit, audit-related, tax and other services. Any service that is not included in the approved list of services must be separately pre-approved by the Audit Committee.


5655




ITEM 15.EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a)1.Financial Statements
   
  Financial statements required by Item 15 are listed in the index included in Item 8 of Part II.
   
 2.Schedules

Schedule II - Valuation and Qualifying Accounts for the years ended December 31, 20132015, 20122014 and 2011
2013

  All other schedules have been omitted because of the absence of the conditions under which they are required or because the required information is included elsewhere in the financial statements incorporated by reference in this Form 10-K.


SCHEDULE II
BLACK HILLS POWER, INC.
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DECEMBER 31,
BLACK HILLS POWER, INC.
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DECEMBER 31,
BLACK HILLS POWER, INC.
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DECEMBER 31,
DescriptionBalance at beginning of yearAdditions charged to costs and expensesDeductions charged to costs and expensesBalance at end of yearBalance at beginning of yearAdditions charged to costs and expensesDeductions charged to costs and expensesBalance at end of year
(in thousands)(in thousands)
Allowance for doubtful accounts:  
2015$261
$602
$(656)$207
2014$220
$699
$(658)$261
2013$102
$754
$(636)$220
$102
$754
$(636)$220
2012$143
$503
$(544)$102
2011$230
$551
$(638)$143


5756




3.Exhibits
Exhibit NumberDescription
  
3.1*Restated Articles of Incorporation of the Registrant (filed as an exhibit to the Registrant’s Form 8-K dated June 7, 1994 (No. 1-7978)).
  
3.2*Articles of Amendment to the Articles of Incorporation of the Registrant, as filed with the Secretary of State of the State of South Dakota on December 22, 2000 (filed as an exhibit to the Registrant’s Form 10-K for 2000).
  
3.3*Bylaws of the Registrant (filed as an exhibit to the Registrant’s Registration Statement on Form S-8 dated July 13, 1999).
  
4.1*Restated and Amended Indenture of Mortgage and Deed of Trust of Black Hills Corporation (now called Black Hills Power, Inc.) dated as of September 1, 1999 (filed as Exhibit 4.19 to the Registrant’s Post-Effective Amendment No. 1 to the Registrant’s Registration Statement on Form S-3 (No. 333-150669-01)). First Supplemental Indenture, dated as of August 13, 2002, between Black Hills Power, Inc. and The Bank of New York Mellon (as successor to J.P. Morgan Chase Bank), as Trustee (filed as Exhibit 4.20 to the Registrant’s Post-Effective Amendment No. 1 to the Registrant’s Registration Statement on Form S-3 (No. 333-150669-01)). Second Supplemental Indenture, dated as of October 27, 2009, between Black Hills Power, Inc. and The Bank of New York Mellon (filed as Exhibit 4.21 to the Registration Statement on Form S-3 (No. 333-150669-01)). Third Supplemental Indenture, dated as of October 1, 2014, between Black Hills Power, Inc., and The Bank of New York Mellon (filed as Exhibit 10.1 to the Registrant’s Form 8-K filed on October 2, 2014).
  
10.1*Restated and Amended Coal Supply Agreement for NS II dated February 12, 1993 (filed as Exhibit 10.1 to the Registrant’s Post-Effective Amendment No. 1 to the Registrant’s Registration Statement on Form S-3 (No. 333-150669-01)).
  
10.2*Second Restated and Amended Power Sales Agreement dated September 29, 1997, between PacifiCorp and Black Hills Power, Inc. (filed as Exhibit 10.2 to the Registrant’s Post-Effective Amendment No. 1 to the Registrant’s Registration Statement on Form S-3 (No. 333-150669-01)).
10.3*Bond Purchase Agreement dated as of June 30, 2014 by and among Black Hills Power, Inc., New York Life Insurance Company, New York Life Insurance and Annuity Corporation, Teachers Insurance and Annuity Association of America, John Hancock Life Insurance Company (U.S.A.), John Hancock Life & Health Insurance Company, John Hancock Life Insurance Company of New York and United of Omaha Life Insurance Company (filed as Exhibit 10.1 to the Registrant’s Form 8-K filed on July 2, 2014).
  
31.1Certification of Chief Executive Officer pursuant to Rule13a-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
  
31.2Certification of Chief Financial Officer pursuant to Rule13a-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
  
32.1Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
  
32.2Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
  
101Financials for XBRL Format
_________________________
*Previously filed as part of the filing indicated and incorporated by reference herein.

(a)See (a) 3. Exhibits above.
(b)See (a) 2. Schedules above.

SUPPLEMENTAL INFORMATION TO BE FURNISHED WITH REPORTS FILED PURSUANT TO SECTION 15(d) OF THE ACT BY REGISTRANTS WHICH HAVE NOT REGISTERED SECURITIES PURSUANT TO SECTION 12 OF THE ACT.

The Registrant is not required to send an Annual Report or Proxy to its sole security holder and parent company, Black Hills Corporation.

5857



SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
  BLACK HILLS POWER, INC.
   
  By/s/ DAVID R. EMERY
  David R. Emery, Chairman and
Chief Executive Officer
   
Dated:February 27, 201426, 2016 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

/s/ DAVID R. EMERYDirector andFebruary 27, 201426, 2016
David R. Emery, Chairman andPrincipal Executive Officer 
Chief Executive Officer  
   
/s/ ANTHONY S. CLEBERGRICHARD W. KINZLEYDirector andFebruary 26, 2016
Richard W. Kinzley, Senior Vice PresidentPrincipal Financial andFebruary 27, 2014
Anthony S. Cleberg, Executive Vice PresidentAccounting Officer 
and Chief Financial OfficerAccounting Officer 
   
/s/ JACK W. EUGSTERLINDEN R. EVANSDirectorFebruary 27, 201426, 2016
Jack W. Eugster
/s/ MICHAEL H. MADISONDirectorFebruary 27, 2014
Michael H. MadisonLinden R. Evans  
   
/s/ STEVEN R. MILLSJ. HELMERSDirectorFebruary 27, 201426, 2016
Stephen R. Mills
/s/ STEPHEN D. NEWLINDirectorFebruary 27, 2014
Stephen D. Newlin
/s/ GARY L. PECHOTADirectorFebruary 27, 2014
Gary L. Pechota
/s/ REBECCA B. ROBERTSDirectorFebruary 27, 2014
Rebecca B. Roberts
/s/ WARREN L. ROBINSONDirectorFebruary 27, 2014
Warren L. Robinson
/s/ JOHN B. VERINGDirectorFebruary 27, 2014
John B. Vering
/s/ THOMASSteven J. ZELLERDirectorFebruary 27, 2014
Thomas J. ZellerHelmers  

5958



INDEX TO EXHIBITS

Exhibit NumberDescription
  
3.1*Restated Articles of Incorporation of the Registrant (filed as an exhibit to the Registrant’s Form 8-K dated June 7, 1994 (No. 1-7978)).
  
3.2*Articles of Amendment to the Articles of Incorporation of the Registrant, as filed with the Secretary of State of the State of South Dakota on December 22, 2000 (filed as an exhibit to the Registrant’s Form 10-K for 2000).
  
3.3*Bylaws of the Registrant (filed as an exhibit to the Registrant’s Registration Statement on Form S-8 dated July 13, 1999).
  
4.1*Restated and Amended Indenture of Mortgage and Deed of Trust of Black Hills Corporation (now called Black Hills Power, Inc.) dated as of September 1, 1999 (filed as Exhibit 4.19 to the Registrant’s Post-Effective Amendment No. 1 to the Registrant’s Registration Statement on Form S-3 (No. 333-150669-01)). First Supplemental Indenture, dated as of August 13, 2002, between Black Hills Power, Inc. and The Bank of New York Mellon (as successor to J.P. Morgan Chase Bank), as Trustee (filed as Exhibit 4.20 to the Registrant’s Post-Effective Amendment No. 1 to the Registrant’s Registration Statement on Form S-3 (No. 333-150669-01)). Second Supplemental Indenture, dated as of October 27, 2009, between Black Hills Power, Inc. and The Bank of New York Mellon (filed as Exhibit 4.21 to the Registration Statement on Form S-3 (No. 333-150669-01)). Third Supplemental Indenture, dated as of October 1, 2014, between Black Hills Power, Inc., and The Bank of New York Mellon (filed as Exhibit 10.1 to the Registrant’s Form 8-K filed on October 2, 2014).
  
10.1*Restated and Amended Coal Supply Agreement for NS II dated February 12, 1993 (filed as Exhibit 10.1 to the Registrant’s Post-Effective Amendment No. 1 to the Registrant’s Registration Statement on Form S-3 (No. 333-150669-01)).
  
10.2*Second Restated and Amended Power Sales Agreement dated September 29, 1997, between PacifiCorp and Black Hills Power, Inc. (filed as Exhibit 10.2 to the Registrant’s Post-Effective Amendment No. 1 to the Registrant’s Registration Statement on Form S-3 (No. 333-150669-01)).
10.3*Bond Purchase Agreement dated as of June 30, 2014 by and among Black Hills Power, Inc., New York Life Insurance Company, New York Life Insurance and Annuity Corporation, Teachers Insurance and Annuity Association of America, John Hancock Life Insurance Company (U.S.A.), John Hancock Life & Health Insurance Company, John Hancock Life Insurance Company of New York and United of Omaha Life Insurance Company (filed as Exhibit 10.1 to the Registrant’s Form 8-K filed on July 2, 2014).
  
31.1Certification of Chief Executive Officer pursuant to Rule13a-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
  
31.2Certification of Chief Financial Officer pursuant to Rule13a-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
  
32.1Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
  
32.2Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
  
101Financial Statements for XBRL Format
_________________________
*Previously filed as part of the filing indicated and incorporated by reference herein.


6059