UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.  20549
FORM 10-Q
(Mark One)
xQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended June 30, 2018
2019or
¨TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission File Number: 001-3280
Public Service Company of Colorado
001-0328084-0296600
(Commission File Number)(I.R.S. Employer Identification No.)
(Exact name of registrant as specified in its charter)
(Registrant, State of Incorporation or Organization, Address of Principal Executive Officers and Telephone Number)
Public Service Company of Colorado
Colorado
1800 Larimer, Suite 1100
DenverColorado80202
303571-7511
Securities registered pursuant to Section 12(b) of the Act:
Title of each class 84-0296600
(State or other jurisdiction of incorporation or organization)Trading Symbol (I.R.S. Employer Identification No.)Name of each exchange on which registered
N/A 
1800 Larimer, Suite 1100N/A 
Denver, Colorado80202
(Address of principal executive offices)(Zip Code)N/A
(303) 571-7511
(Registrant’s telephone number, including area code)

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. xYes¨ No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 and 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). xYes¨ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company.  See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Large accelerated filer¨
 
Accelerated filer¨
Non-accelerated filerSmaller reporting company
   
Non-accelerated filer x
Smaller reporting company ¨
(Do not check if smaller reporting company)
Emerging growth company¨
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

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

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.
Class July 27, 2018August 1, 2019
Common Stock, $0.01 par value 100 shares


Public Service Company of Colorado meets the conditions set forth in General Instruction H (1) H(1)(a) and (b) of Form 10-Q and is therefore filing this Form 10-Q with the reduced disclosure format specified in General Instruction H (2)H(2) to such Form 10-Q.

     





TABLE OF CONTENTS

PART I — FINANCIAL INFORMATION
 
Item l —
Item 2 —
Item 4 —
   
PART II — OTHER INFORMATION
 
Item 1 —
Item 1A —
Item 6 —
   

  
Certifications Pursuant to Section 3021
Certifications Pursuant to Section 9061
Statement Pursuant to Private Litigation1

This Form 10-Q is filed by Public Service Company of Colorado a Colorado corporation (PSCo). PSCo is a wholly owned subsidiary of Xcel Energy Inc. Xcel Energy Inc. wholly owns the following subsidiaries: Northern States Power Company, a Minnesota corporation (NSP-Minnesota); Northern States Power Company, a Wisconsin corporation (NSP-Wisconsin); PSCo; and Southwestern Public Service Company, a New Mexico corporation (SPS). NSP-Minnesota, NSP-Wisconsin, PSCo and SPS are also referred to collectively as utility subsidiaries. Additional information on Xcel Energy Inc. and its subsidiaries (collectively, Xcel Energy) is available onin various filings with the SEC. This report should be read in its entirety.



ABBREVIATIONS AND INDUSTRY TERMS
Xcel Energy Inc.’s Subsidiaries and Affiliates (current and former)
NSP-MinnesotaNorthern States Power Company, a Minnesota corporation
NSP-WisconsinNorthern States Power Company, a Wisconsin corporation
PSCoPublic Service Company of Colorado
SPSSouthwestern Public Service Company
Utility subsidiariesNSP-Minnesota, NSP-Wisconsin, PSCo and SPS
WYCOWYCO Development, LLC
Xcel EnergyXcel Energy Inc. and subsidiaries
Federal and State Regulatory Agencies
CPUCColorado Public Utilities Commission
EPAUnited States Environmental Protection Agency
IRSInternal Revenue Service
SECSecurities and Exchange Commission
Electric, Purchased Gas and Resource Adjustment Clauses
TCATransmission cost adjustment
Other
ACEAffordable Clean Energy
AFUDCAllowance for funds used during construction
ASCFASB Accounting Standards Codification
ASUFASB Accounting Standards Update
C&ICommercial and Industrial
CACJAClean Air Clean Jobs Act
CCRCoal combustion residual
CCR RuleFinal rule (40 CFR 257.50 - 257.107) published by the EPA regulating the management, storage and disposal of CCRs as a nonhazardous waste
CIGColorado Interstate Gas Company, LLC
DRCDevelopment Recovery Company
ETREffective tax rate
FASBFinancial Accounting Standards Board
GAAPGenerally accepted accounting principles
IPPIndependent power producing entity
MGPManufactured gas plant
NOLNet operating loss
O&MOperating and maintenance
PPAPurchased power agreement
PTCProduction tax credit
ROEReturn on equity
ROURight-of-use
TCJA2017 federal tax reform enacted as Public Law No: 115-97, commonly referred to as the Tax Cuts and Jobs Act
Measurements
MWMegawatts
Forward-Looking Statements
Except for the historical statements contained in this report, the matters discussed herein are forward-looking statements that are subject to certain risks, uncertainties and Exchange Commission (SEC).assumptions. Such forward-looking statements, assumptions and other statements are intended to be identified in this document by the words “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “objective,” “outlook,” “plan,” “project,” “possible,” “potential,” “should,” “will,” “would” and similar expressions. Actual results may vary materially. Forward-looking statements speak only as of the date they are made, and we expressly disclaim any obligation to update any forward-looking information. The following factors, in addition to those discussed elsewhere in this Quarterly Report on Form 10-Q and in other securities filings (including PSCo’s Annual Report on Form 10-K for the fiscal year ended Dec. 31, 2018 and subsequent securities filings), could cause actual results to differ materially from management expectations as suggested by such forward-looking information: changes in environmental laws and regulations; climate change and other weather natural disaster and resource depletion, including compliance with any accompanying legislative and regulatory changes; ability to recover costs from customers; reductions in our credit ratings and the cost of maintaining certain contractual relationships; general economic conditions, including inflation rates, monetary fluctuations and their impact on capital expenditures and the ability of PSCo and its subsidiaries to obtain financing on favorable terms; availability or cost of capital; our customers’ and counterparties’ ability to pay their debts to us; assumptions and costs relating to funding our employee benefit plans and health care benefits; tax laws; operational safety; successful long-term operational planning; commodity risks associated with energy markets and production; rising energy prices; costs of potential regulatory penalties; effects of geopolitical events, including war and acts of terrorism; cyber security threats and data security breaches; fuel costs; and employee work force and third party contractor factors.


PART I — FINANCIAL INFORMATION

Item 1FINANCIAL STATEMENTS

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
(amounts in thousands)millions)
Three Months Ended June 30 Six Months Ended June 30Three Months Ended June 30 Six Months Ended June 30
2018 2017 2018 20172019 2018 2019 2018
Operating revenues              
Electric$716,195
 $729,920
 $1,414,469
 $1,441,308
$692.7
 $716.2
 $1,434.2
 $1,414.5
Natural gas186,661
 192,777
 550,647
 548,913
207.6
 186.7
 676.7
 550.6
Steam and other9,010
 8,219
 20,048
 21,229
9.7
 9.0
 22.1
 20.1
Total operating revenues911,866
 930,916
 1,985,164
 2,011,450
910.0
 911.9
 2,133.0
 1,985.2
              
Operating expenses 
  
     
  
    
Electric fuel and purchased power271,891
 279,522
 553,061
 568,349
240.7
 271.9
 544.9
 553.1
Cost of natural gas sold and transported58,559
 70,258
 249,824
 266,660
69.9
 58.6
 342.4
 249.8
Cost of sales — steam and other3,664
 3,507
 7,540
 7,893
3.9
 3.7
 8.4
 7.5
Operating and maintenance expenses188,991
 187,394
 372,066
 372,482
200.3
 189.0
 399.5
 372.1
Demand side management expenses33,202
 29,928
 65,954
 58,032
32.2
 33.2
 64.4
 65.9
Depreciation and amortization116,553
 117,513
 238,160
 232,507
148.1
 116.5
 295.0
 238.2
Taxes (other than income taxes)49,743
 49,470
 102,400
 99,268
52.2
 49.7
 105.9
 102.4
Total operating expenses722,603
 737,592
 1,589,005
 1,605,191
747.3
 722.6
 1,760.5
 1,589.0
              
Operating income189,263
 193,324
 396,159
 406,259
162.7
 189.3
 372.5
 396.2
              
Other income, net799
 1,319
 1,030
 4,523
Other (expense) income, net(0.3) 0.8
 0.6
 1.0
Allowance for funds used during construction — equity13,555
 6,341
 24,499
 10,949
5.0
 13.5
 9.1
 24.5
              
Interest charges and financing costs 
  
     
  
    
Interest charges — includes other financing costs of $1,601 and $1,543, $3,173, and $3,064 respectively51,221
 46,424
 101,142
 92,306
Interest charges — includes other financing costs of $1.6, $1.6, $3.2 and $3.2, respectively57.7
 51.2
 117.1
 101.2
Allowance for funds used during construction — debt(5,205) (2,438) (9,786) (4,344)(2.4) (5.2) (4.9) (9.8)
Total interest charges and financing costs46,016
 43,986
 91,356
 87,962
55.3
 46.0
 112.2
 91.4
              
Income before income taxes157,601
 156,998
 330,332
 333,769
112.1
 157.6
 270.0
 330.3
Income taxes35,305
 56,411
 74,314
 121,636
10.6
 35.3
 29.7
 74.3
Net income$122,296
 $100,587
 $256,018
 $212,133
$101.5
 $122.3
 $240.3
 $256.0
 
See Notes to Consolidated Financial Statements

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
(amounts in thousands)millions)
 Three Months Ended June 30 Six Months Ended June 30 Three Months Ended June 30 Six Months Ended June 30
 2018 2017 2018 2017 2019 2018 2019 2018
Net income $122,296
 $100,587
 $256,018
 $212,133
 $101.5
 $122.3
 $240.3
 $256.0
                
Other comprehensive income (loss)      
  
        
Pension and retiree medical benefits:        
Amortization of losses included in net periodic benefit cost, net of tax of $0, $1, $0, and $2, respectively 2
 1
 4
 2
Other comprehensive income      
  
                
Derivative instruments:      
  
      
  
Reclassification of losses to net income, net of tax of $99, $153, $197 and $305, respectively 303
 250
 603
 496
Reclassification of losses to net income, net of tax of $0.1, $0.1, $0.2 and $0.2, respectively 0.3
 0.3
 0.6
 0.6
                
Other comprehensive income 305
 251
 607
 498
 0.3
 0.3
 0.6
 0.6
Comprehensive income $122,601
 $100,838
 $256,625
 $212,631
 $101.8
 $122.6
 $240.9
 $256.6


See Notes to Consolidated Financial Statements



PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)
(amounts in thousands)millions)
Six Months Ended June 30Six Months Ended June 30
2018 20172019 2018
Operating activities      
Net income$256,018
 $212,133
$240.3
 $256.0
Adjustments to reconcile net income to cash provided by operating activities: 
  
 
  
Depreciation and amortization240,577
 234,143
297.4
 240.6
Demand side management program amortization
 672
Deferred income taxes25,579
 126,252
2.8
 25.6
Amortization of investment tax credits(1,399) (1,401)(1.3) (1.4)
Allowance for equity funds used during construction(24,499) (10,949)(9.1) (24.5)
Net realized and unrealized hedging and derivative transactions(1,917) 1,951
(2.2) (1.9)
Other1
 
Changes in operating assets and liabilities: 
  
 
  
Accounts receivable21,991
 24,042
63.2
 22.0
Accrued unbilled revenues66,497
 81,649
77.2
 66.5
Inventories44,769
 38,452
16.5
 44.8
Prepayments and other1,522
 (4,837)0.5
 1.5
Accounts payable(22,097) (51,894)(111.8) (22.1)
Net regulatory assets and liabilities30,405
 (2,499)80.0
 30.4
Other current liabilities(119,132) (67,418)(94.6) (119.1)
Pension and other employee benefit obligations(27,457) (16,543)(43.5) (27.5)
Change in other noncurrent assets3,880
 (717)
Change in other noncurrent liabilities(14,546) (228)
Other, net0.5
 (10.7)
Net cash provided by operating activities480,192
 562,808
515.9
 480.2
      
Investing activities 
  
 
  
Utility capital/construction expenditures(825,463) (609,369)(632.5) (801.0)
Allowance for equity funds used during construction24,499
 10,949
Investments in utility money pool arrangement(198,000) (777,000)(131.0) (198.0)
Repayments from utility money pool arrangement56,000
 625,000
131.0
 56.0
Other, net
 (657)
Net cash used in investing activities(942,964) (751,077)(632.5) (943.0)
      
Financing activities 
  
 
  
Repayments of short-term borrowings, net
 (129,000)(86.0) 
Borrowings under utility money pool arrangement526,000
 40,000
58.0
 526.0
Repayments under utility money pool arrangement(526,000) (40,000)(8.0) (526.0)
Proceeds from issuance of long-term debt692,697
 394,611
391.6
 692.7
Repayments of long-term debt(400.0) 
Capital contributions from parent216,508
 82,475
332.2
 216.5
Dividends paid to parent(171,546) (161,312)(190.4) (171.5)
Other(118) (110)
Other, net
 (0.1)
Net cash provided by financing activities737,541
 186,664
97.4
 737.6
      
Net change in cash and cash equivalents274,769
 (1,605)(19.2) 274.8
Cash and cash equivalents at beginning of period7,513
 5,926
33.4
 7.5
Cash and cash equivalents at end of period$282,282
 $4,321
$14.2
 $282.3
      
Supplemental disclosure of cash flow information: 
  
 
  
Cash paid for interest (net of amounts capitalized)$(88,912) $(84,452)$(107.4) $(88.9)
Cash paid for income taxes, net(96,448) (12,195)(28.7) (96.4)
Supplemental disclosure of non-cash investing transactions: 
  
Property, plant and equipment additions in accounts payable$131,823
 $103,774
Supplemental disclosure of non-cash investing and financing transactions: 
  
Accrued property, plant and equipment additions$113.1
 $131.8
Inventory transfers to property, plant and equipment15.4
 9.3
Operating lease right-of-use assets653.4
 
Allowance for equity funds used during construction9.1
 24.5


See Notes to Consolidated Financial Statements

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS (UNAUDITED)
(amounts in thousands,millions, except share and per share data)
June 30, 2018 Dec. 31, 2017June 30, 2019 Dec. 31, 2018
Assets      
Current assets      
Cash and cash equivalents$282,282
 $7,513
$14.2
 $33.4
Accounts receivable, net272,293
 294,403
252.6
 310.3
Accounts receivable from affiliates38,650
 14,719
21.2
 80.8
Investments in utility money pool arrangement162,000
 20,000
Accrued unbilled revenues229,304
 295,801
236.3
 313.5
Inventories169,720
 214,489
165.5
 197.4
Regulatory assets76,419
 77,337
68.4
 120.6
Derivative instruments5,340
 3,197
18.4
 42.6
Prepayments and other39,237
 35,720
26.4
 23.8
Total current assets1,275,245
 963,179
803.0
 1,122.4
      
Property, plant and equipment, net14,541,078
 14,025,751
15,335.7
 15,120.0
      
Other assets 
  
 
  
Regulatory assets980,811
 950,258
1,052.3
 1,010.7
Derivative instruments2,716
 1,009
2.5
 1.2
Operating lease right-of-use assets613.7
 
Other23,259
 27,429
175.1
 37.2
Total other assets1,006,786
 978,696
1,843.6
 1,049.1
Total assets$16,823,109
 $15,967,626
$17,982.3
 $17,291.5
      
Liabilities and Equity 
  
 
  
Current liabilities 
  
 
  
Current portion of long-term debt$705,869
 $305,577
$
 $406.2
Short-term debt221.0
 307.0
Borrowings under utility money pool arrangement50.0
 
Accounts payable433,822
 492,829
383.5
 503.4
Accounts payable to affiliates38,395
 58,749
43.6
 46.0
Regulatory liabilities95,053
 66,126
116.9
 67.3
Taxes accrued108,812
 222,517
118.5
 202.0
Accrued interest49,803
 48,552
46.4
 43.2
Dividends payable to parent100,338
 76,195
104.9
 91.5
Derivative instruments5,428
 7,348
9.7
 34.6
Other92,583
 92,333
182.5
 101.5
Total current liabilities1,630,103
 1,370,226
1,277.0
 1,802.7
      
Deferred credits and other liabilities 
  
 
  
Deferred income taxes1,678,207
 1,644,476
1,738.6
 1,719.3
Deferred investment tax credits26,459
 27,858
24.1
 25.3
Regulatory liabilities1,926,944
 1,933,488
2,023.4
 2,021.5
Asset retirement obligations355,028
 347,769
346.2
 338.7
Derivative instruments2,471
 3,468
0.6
 0.6
Customer advances170,659
 162,614
169.1
 168.1
Pension and employee benefit obligations260,012
 287,783
231.3
 275.3
Operating lease liabilities560.3
 
Other49,454
 58,923
152.5
 50.4
Total deferred credits and other liabilities4,469,234
 4,466,379
5,246.1
 4,599.2
      
Commitments and contingencies

 



 

Capitalization 
  
 
  
Long-term debt4,594,193
 4,302,698
4,846.1
 4,591.4
Common stock — 100 shares authorized at $0.01 par value; 100 shares
outstanding at June 30, 2018 and Dec. 31, 2017, respectively

 
Common stock — 100 shares authorized at $0.01 par value; 100 shares
outstanding at June 30, 2019 and Dec. 31, 2018, respectively

 
Additional paid in capital4,273,146
 4,032,826
4,618.3
 4,340.5
Retained earnings1,882,558
 1,822,229
2,019.7
 1,983.2
Accumulated other comprehensive loss(26,125) (26,732)(24.9) (25.5)
Total common stockholder’s equity6,129,579
 5,828,323
6,613.1
 6,298.2
Total liabilities and equity$16,823,109
 $15,967,626
$17,982.3
 $17,291.5


See Notes to Consolidated Financial Statements

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER’S EQUITY (UNAUDITED)
(amounts in millions, except share data)
 Common Stock Issued Retained Earnings Accumulated
Other
Comprehensive
Loss
 Total
Common
Stockholder’s
Equity
 Shares Par Value Additional Paid In Capital   
Three Months Ended June 30, 2019 and 2018          
Balance at March 31, 2018100
 $
 $4,032.8
 $1,860.6
 $(26.4) $5,867.0
Net income      122.3
   122.3
Other comprehensive income        0.3
 0.3
Dividends declared to parent      (100.3)   (100.3)
Contribution of capital by parent    240.3
     240.3
Balance at June 30, 2018100
 $
 $4,273.1
 $1,882.6
 $(26.1) $6,129.6
            
Balance at March 31, 2019100
 $
 $4,390.5
 $2,023.1
 $(25.2) $6,388.4
Net income      101.5
   101.5
Other comprehensive income        0.3
 0.3
Dividends declared to parent      (104.9)   (104.9)
Contribution of capital by parent    227.8
     227.8
Balance at June 30, 2019100
 $
 $4,618.3
 $2,019.7
 $(24.9) $6,613.1
            
See Notes to Consolidated Financial Statements

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER’S EQUITY (UNAUDITED)
(amounts in millions, except share data)

 Common Stock Issued Retained Earnings Accumulated
Other
Comprehensive
Loss
 Total
Common
Stockholder’s
Equity
 Shares Par Value Additional Paid In Capital   
Six Months Ended June 30, 2019 and 2018          
Balance at Dec. 31, 2017100
 $
 $4,032.8
 $1,822.2
 $(26.7) $5,828.3
Net income      256.0
   256.0
Other comprehensive income        0.6
 0.6
Dividends declared to parent      (195.6)   (195.6)
Contribution of capital by parent    240.3
     240.3
Balance at June 30, 2018100
 $
 $4,273.1
 $1,882.6
 $(26.1) $6,129.6
            
Balance at Dec. 31, 2018100
 $
 $4,340.5
 $1,983.2
 $(25.5) $6,298.2
Net income      240.3
   240.3
Other comprehensive income        0.6
 0.6
Dividends declared to parent      (203.8)   (203.8)
Contribution of capital by parent    277.8
     277.8
Balance at June 30, 2019100
 $
 $4,618.3
 $2,019.7
 $(24.9) $6,613.1
            
See Notes to Consolidated Financial Statements


PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES
Notes to Consolidated Financial Statements (UNAUDITED)

In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly, in accordance with accounting principles generally accepted in the United States of America (GAAP),GAAP, the financial position of PSCo and its subsidiaries as of June 30, 20182019 and Dec. 31, 2017;2018; the results of its operations, including the components of net income and comprehensive income, and changes in stockholders’ equity for the three and six months ended June 30, 20182019 and 2017;2018; and its cash flows for the six months ended June 30, 20182019 and 2017.2018. All adjustments are of a normal, recurring nature, except as otherwise disclosed. Management has also evaluated the impact of events occurring after June 30, 20182019 up to the date of issuance of these consolidated financial statements. These statements contain all necessary adjustments and disclosures resulting from that evaluation. The Dec. 31, 20172018 balance sheet information has been derived from the audited 20172018 consolidated financial statements included in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2017.2018. These notes to the consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP on an annual basis have been condensed or omitted pursuant to such rules and regulations. For further information, refer to the consolidated financial statements and notes thereto, included in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2017,2018, filed with the SEC on Feb. 23, 2018.22, 2019. Due to the seasonality of PSCo’s electric and natural gas sales, interim results are not necessarily an appropriate base from which to project annual results.

1.Summary of Significant Accounting Policies

The significant accounting policies set forth in Note 1 to the consolidated financial statements in the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2017,2018, appropriately represent, in all material respects, the current status of accounting policies and are incorporated herein by reference.

2.Accounting Pronouncements

Recently Issued

Leases Credit LossesIn February In 2016, the FASB issued Financial Accounting Standards Board (FASB) issued Leases,Instruments - Credit Losses, Topic 842 (Accounting Standards Update (ASU) No. 2016-02)326 (ASC Topic 326), which changes how entities account for lesseeslosses on receivables and certain other assets. The guidance requires balance sheetuse of a current expected credit loss model, which may result in earlier recognition of right-of-use assets and lease liabilities for most leases. This guidance will becredit losses than under previous accounting standards. ASC Topic 326 is effective for interim and annual reporting periods beginning on or after Dec. 15, 2018. PSCo has not yet fully determined the impacts2019, and will be applied on a modified-retrospective approach through a cumulative-effect adjustment to retained earnings as of implementation. However, adoption is expected to occur on Jan. 1, 2019 utilizing2020. PSCo is currently evaluating the practical expedients provided byimpact of adoption of the new standard and proposed in Targeted Improvements, Topic 842 (Proposed ASU 2018-200). On Jan. 1, 2019 agreements considered leases for the use of office space, equipment and natural gas storage assets, as well as certain purchased power agreements (PPAs) for fossil-fueled generating facilities are expected to be recognized on theits consolidated balance sheet.financial statements.

Recently Adopted

Revenue RecognitionLeases In May 2014,2016, the FASB issued Revenue from Contracts with Customers, Leases, Topic 606 (ASU No. 2014-09)842(ASC Topic 842), which provides a new frameworkaccounting and disclosure guidance for leasing activities, most significantly requiring that operating leases be recognized on the recognition of revenue.balance sheet. PSCo implementedadopted the guidance on a modified retrospective basis on Jan. 1, 2018. Results2019 utilizing the package of transition practical expedients provided by the new standard, including carrying forward prior conclusions on whether agreements existing before the adoption date contain leases and whether existing leases are operating or finance leases; ASC Topic 842 refers to capital leases as finance leases.
Specifically for land easement contracts, PSCo has elected the practical expedient provided by ASU No. 2018-01 Leases: Land Easement Practical Expedient for Transition to Topic 842, and as a result, only those easement contracts entered on or after Jan. 1, 2019 will be evaluated to determine if lease treatment is appropriate.
PSCo also utilized the transition practical expedient offered by ASU No. 2018-11 Leases: Targeted Improvements to implement the standard on a prospective basis. As a result, reporting periods in the consolidated financial statements beginning after Dec. 31, 2017 are presented in accordance withJan. 1, 2019 reflect the implementation of ASC Topic 606,842, while prior period results have not been adjusted andperiods continue to be reported in accordance with prior accounting guidance.Leases, Topic 840 (ASC Topic 840). Other than increased disclosures regarding revenues related to contracts with customers,first-time recognition of operating leases on its consolidated balance sheet, the implementation of ASC Topic 842 did not have a significant impact on PSCo’s consolidated financial statements. For related disclosures, see Note 13 to the consolidated financial statements.

Classification and MeasurementAdoption resulted in recognition of Financial Instruments — In January 2016, the FASB issued Recognition and Measurement of Financial Assets and Financial Liabilities, Subtopic 825-10 (ASU No. 2016-01), which eliminated the available-for-sale classification for marketable equity securities and also replaced the cost method of accounting for non-marketable equity securities with a model for recognizing impairments and observable price changes. Under the new standard, other than when the consolidation or equity method of accounting is utilized, changes in the fair value of equity securities are recognized in earnings. PSCo implemented the guidance on Jan. 1, 2018 and the implementation did not have a material impact on its consolidated financial statements.

Presentation of Net Periodic Benefit Cost —In March 2017, the FASB issued Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, Topic 715 (ASU No. 2017-07), which establishes that only the service cost element of pension cost may be presented as a componentapproximately $0.7 billion of operating income in the income statement. Also under the guidance, only the service cost component of pension cost is eligiblelease ROU assets and current/noncurrent operating lease liabilities. See Note 9 for capitalization. As a result of the application of accounting principles for rate regulated entities, a similar amount of pension cost, including non-service components, will be recognized consistent with the historical ratemaking treatment, and the impacts of adoption will be limited to changes in classification of non-service costs in the consolidated statement of income. PSCo implemented the new guidance on Jan. 1, 2018, and as a result, $1.0 million of pension costs were retrospectively reclassified from operating and maintenance expenses to other income, net on the consolidated income statement for the six months ended June 30, 2017. Under a practical expedient permitted by the standard, PSCo used benefit cost amounts disclosed for prior periods as the basis for retrospective application.

leasing disclosures.
3.Selected Balance Sheet Data
(Millions of Dollars) June 30, 2019 Dec. 31, 2018
Accounts receivable, net    
Accounts receivable $272.3
 $330.8
Less allowance for bad debts (19.7) (20.5)
  $252.6
 $310.3
(Thousands of Dollars) June 30, 2018 Dec. 31, 2017
Accounts receivable, net    
Accounts receivable $290,832
 $314,009
Less allowance for bad debts (18,539) (19,606)
  $272,293
 $294,403

(Millions of Dollars) June 30, 2019 Dec. 31, 2018
Inventories    
Materials and supplies $61.8
 $61.9
Fuel 71.7
 69.5
Natural gas 32.0
 66.0
  $165.5
 $197.4
(Thousands of Dollars) June 30, 2018 Dec. 31, 2017
Inventories    
Materials and supplies $70,940
 $68,940
Fuel 62,532
 73,893
Natural gas 36,248
 71,656
  $169,720
 $214,489

(Millions of Dollars) June 30, 2019 Dec. 31, 2018
Property, plant and equipment, net    
Electric plant $13,922.3
 $13,604.5
Natural gas plant 4,443.0
 4,387.6
Common and other property 1,052.3
 1,023.7
Plant to be retired (a)
 290.2
 321.9
Construction work in progress 638.9
 573.3
Total property, plant and equipment 20,346.7
 19,911.0
Less accumulated depreciation (5,011.0) (4,791.0)
  $15,335.7
 $15,120.0
(Thousands of Dollars) June 30, 2018 Dec. 31, 2017
Property, plant and equipment, net    
Electric plant $12,780,963
 $12,627,592
Natural gas plant 4,211,977
 4,102,075
Common and other property 1,040,638
 1,022,333
Plant to be retired (a)
 10,306
 10,949
Construction work in progress 1,444,140
 1,014,338
Total property, plant and equipment 19,488,024
 18,777,287
Less accumulated depreciation (4,946,946) (4,751,536)
  $14,541,078
 $14,025,751


(a) 
In 2018, the third quarterCPUC approved early retirement of 2017, PSCo early retired Valmont Unit 5PSCo’s Comanche Units 1 and converted Cherokee Unit 4 from a coal-fueled generating facility to natural gas.2 in approximately 2022 and 2025, respectively. PSCo also expects Craig Unit 1 to be retired early retired in approximately 2025. Amounts are presented net of accumulated depreciation.

4.Income Taxes

Except to the extent noted below, Note 7 to the consolidated financial statements included in PSCo’s Annual Report on Form 10-K for the year ended Dec. 31, 2017 appropriately represents, in all material respects, the current status of other income tax matters, and are incorporated herein by reference.


Total income tax expense from operations differs from the amount computed by applying the statutory federal income tax rate to income before income tax expense. The following reconciles such differences:
  Six Months Ended June 30
  2018 2017
Federal statutory rate 21.0 % 35.0 %
State tax, net of federal tax effect 3.7
 3.0
Increases (decreases) in tax from: 
 
Regulatory differences - ARAM (a)
 (3.2) (0.1)
Regulatory differences - ARAM deferral (b)
 3.0
 
Regulatory differences - other utility plant items (1.3) (0.9)
Tax credits, net of federal income tax expense (1.0) (0.7)
Other, net 0.3
 0.1
Effective income tax rate 22.5 % 36.4 %

(a)
The average rate assumption method (ARAM); a method to flow back excess deferred taxes to customers.
(b)
As we receive direction from our regulatory commissions regarding the return of excess deferred taxes (to our customers resulting from the Tax Cuts and Jobs Act
(TCJA)), the ARAM deferral may decrease during the year, which would result in a reduction to tax expense with a corresponding reduction to revenue.

Federal Audits PSCO is a member of the Xcel Energy affiliated group that files a consolidated federal income tax return. The statute of limitations applicable to Xcel Energy’s federal income tax returns expire as follows:
Tax Year(s)Expiration
2009 - 2011December 2018
2012 - 2014October 2019
2015September 2019
2016September 2020

In 2012, the Internal Revenue Service (IRS) commenced an examination of tax years 2010 and 2011, including the 2009 carryback claim. The IRS proposed an adjustment to the federal tax loss carryback claims and in 2015, the IRS forwarded the issue to the Office of Appeals (Appeals). In 2017 Xcel Energy and Appeals reached an agreement and the benefit related to the agreed upon portions was recognized. PSCo did not accrue any income tax benefit related to this adjustment. In the second quarter of 2018, the Joint Committee on Taxation completed its review and took no exception to the agreement. As a result, the remaining unrecognized tax benefit was released and recorded as a payable to the IRS.

In the third quarter of 2015, the IRS commenced an examination of tax years 2012 and 2013. In the third quarter of 2017, the IRS concluded the audit of tax years 2012 and 2013 and proposed an adjustment that would impact Xcel Energy’s net operating loss (NOL) and effective tax rate (ETR). After evaluating the proposed adjustment Xcel Energy filed a protest with the IRS. As of June 30, 2018, the case has been forwarded to Appeals and Xcel Energy has recognized its best estimate of income tax expense that will result from a final resolution of this issue; however, the outcome and timing of a resolution is unknown.

State Audits — PSCo is a member of the Xcel Energy affiliated group that files consolidated state income tax returns. As of June 30, 2018, PSCo’s earliest open tax year that is subject to examination by state taxing authorities under applicable statutes of limitations is 2009. There are currently no state income tax audits in progress.


Unrecognized Benefits The unrecognized tax benefit balance includes permanent tax positions, which if recognized would affect the annual ETR. In addition, the unrecognized tax benefit balance includes temporary tax positions for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. A change in the period of deductibility would not affect the ETR but would accelerate the payment of cash to the taxing authority to an earlier period.

A reconciliation of the amount of unrecognized tax benefit is as follows:
(Millions of Dollars) June 30, 2018 Dec. 31, 2017
Unrecognized tax benefit — Permanent tax positions $4.4
 $4.0
Unrecognized tax benefit — Temporary tax positions 5.0
 6.1
Total unrecognized tax benefit $9.4
 $10.1

The unrecognized tax benefit amounts were reduced by the tax benefits associated with NOL and tax credit carryforwards. The amounts of tax benefits associated with NOL and tax credit carryforwards are as follows:
(Millions of Dollars) June 30, 2018 Dec. 31, 2017
NOL and tax credit carryforwards $(4.7) $(4.0)

It is reasonably possible that PSCo’s amount of unrecognized tax benefits could significantly change in the next 12 months as the IRS Appeals progresses and the IRS and state audits resume. As the IRS Appeals progresses and the IRS audit resumes, it is reasonably possible that the amount of unrecognized tax benefit could decrease up to approximately $8 million.

The payable for interest related to unrecognized tax benefits is partially offset by the interest benefit associated with NOL and tax credit carryforwards. The payables for interest related to unrecognized tax benefits at June 30, 2018, and Dec. 31, 2017 were not material. No amounts were accrued for penalties related to unrecognized tax benefits as of June 30, 2018 or Dec. 31, 2017.

5.Rate Matters

Except to the extent noted below, the circumstances set forth in Note 11 to the consolidated financial statements included in PSCo’s Annual Report on Form 10-K for the year ended Dec. 31, 2017 and in Note 5 to the consolidated financial statements to PSCo’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018, appropriately represent, in all material respects, the current status of other rate matters, and are incorporated herein by reference.

Tax Reform Regulatory Proceedings

The specific impacts of the TCJA on customer rates are subject to regulatory approval. Each of the states in Xcel Energy’s service areas, including Colorado, have opened dockets to address the impacts of the TCJA.

Colorado Natural Gas — In February 2018, the administrative law judge (ALJ) approved PSCo and the Colorado Public Utilities Commission (CPUC) Staff’s TCJA settlement agreement which includes a $20 million reduction to provisional rates effective March 1, 2018. A final true-up would provide customers the full net benefit of the TCJA retroactive to January 2018.

Colorado Electric— In April 2018, PSCo, the CPUC Staff and the Office of Consumer Counsel (OCC) filed a TCJA settlement agreement that recommended a customer refund of $42 million in 2018, with the remainder of $59 million be used to accelerate the amortization of an existing prepaid pension asset.  In June 2018, the CPUC approved the customer refund of $42 million, effective June 1, 2018. The CPUC set the decision regarding the remainder of the $59 million for hearing before an ALJ. Revisions to the TCJA settlement will be addressed in a future electric rate case.


Pending Regulatory Proceedings — CPUC

Colorado 2017 Multi-Year Electric Rate Case — In October 2017, PSCo filed a multi-year request with the CPUC seeking to increase electric rates approximately $245 million over four years. The request was based on forecast test years (FTY), a 10.0 percent return on equity (ROE) and an equity ratio of 55.25 percent. Interim rates, subject to refund and interest, were to be effective on June 1, 2018.
Revenue Request (Millions of Dollars) 2018 2019 2020 2021 Total
Revenue request $74
 $75
 $60
 $36
 $245
Clean Air Clean Jobs Act (CACJA) rider conversion to base rates 90
 
 
 
 90
Transmission Cost Adjustment (TCA) rider conversion to base rates 43
 
 
 
 43
  Total $207
 $75
 $60
 $36
 $378
           
Expected year-end rate base (billions of dollars) $6.8
 $7.1
 $7.3
 $7.4
  
In March 2018, PSCo, CPUC Staff and OCC reached a settlement and filed a motion with the CPUC requesting changes to the procedural schedule and scope of the electric case, which included delaying the implementation of provisional rates from June 2018 to January 2019 and requiring PSCo to file updated test year information for 2019 through 2021 which included the impacts of TCJA. In April 2018, the CPUC denied the motion on procedural grounds and dismissed the electric rate case.

Colorado 2017 Multi-Year Natural Gas Rate Case — In June 2017, PSCo filed a multi-year request with the CPUC seeking to increase retail natural gas rates approximately $139 million over three years. The request, detailed below, was based on FTYs, a 10.0 percent ROE and an equity ratio of 55.25 percent.
Revenue Request (Millions of Dollars) 2018 2019 2020 Total
Revenue request $63
 $33
 $43
 $139
Pipeline System Integrity Adjustment (PSIA) rider conversion to base rates (a)
 
 94
 
 94
Total $63
 $127
 $43
 $233
         
Expected year-end rate base (billions of dollars) (b)
 $1.5
 $2.3
 $2.4
  
(a)
The roll-in of PSIA rider revenue into base rates will not have an impact on customer bills or revenue as these costs are already being recovered through the rider. The recovery of incremental PSIA related investments in 2019 and 2020 are included in the base rate request.
(b)
The additional rate base in 2019 predominantly reflects the roll-in of capital associated with the PSIA rider.

In February 2018, the administrative law judge (ALJ) approved a TCJA settlement agreement between PSCo and the CPUC Staff, which reduced provisional rates by $20 million, based on a preliminary TCJA estimate of $29 million. The settlement remains subject to CPUC approval. The impact of the TCJA will be trued-up later in 2018. Annualized provisional rates of approximately $43 million were effective March 1, 2018.

In May 2018, the ALJ issued an interim recommended decision which would result in a 2018 overall rate increase of approximately $46 million, prior to the impact of the TCJA. The estimated rate increase reflects a 2016 HTY with a 13-month average rate base of $1.6 billion, a ROE of 9.35 percent and an equity ratio of 54.2 percent.
On July 12, 2018, the CPUC deliberated and approved several of the ALJ’s recommendations including application of a 2016 HTY, with a 13-month average rate base, and an ROE of 9.35 percent.  The CPUC adjusted the equity ratio to 54.6 percent and provided no return on the prepaid pension and retiree medical asset.  With these adjustments the total rate increase, prior to TCJA impacts, would be $47 million.


The estimated impact of the CPUC’s decision is presented below:
(Millions of Dollars) Estimated Impact of the CPUC’s Decision
Filed 2018 revenue request based on a FTY $63
Impact of the change in test year 5
PSCo’s deficiency based on a 2016 HTY - year-end rate base 68
   
Adjustments:  
  ROE at 9.35 percent (9)
Equity ratio of 54.6 percent (2)
Change in amortization period for certain regulatory assets, including a debt return (6)
Loss of return on prepaid pension and retiree medical (4)
Change from 2016 year-end to average rate base (5)
Other, net 5
Total adjustments (21)
   
Total rate increase, prior to the TCJA impacts 
 $47
The CPUC is expected to issue its order on the natural gas rate case in the third quarter of 2018. The CPUC is expected to issue a final decision with the impacts of the TCJA, later in 2018.

Provisional rates, subject to refund, were implemented on Jan. 1, 2018. A current liability which represents PSCo’s best estimate of a refund obligation associated with provisional rates was recorded as of June 30, 2018.

PSIA Rider
In June 2018, PSCo filed for an extension to the PSIA rider through 2020. PSCo requested an expedited decision by Nov. 15, 2018. PSCo also requested authorization to roll-in recovery of costs in the current PSIA rider into base rates effective Jan. 1, 2019, if the CPUC rejects the proposed PSIA extension or fails to rule on the request by the end of 2018.

Additionally, PSCo reduced PSIA revenues by approximately $8 million for 2018 for the impact of the TCJA, effective May 1, 2018. PSIA revenues are subject to the CPUC approved PSIA rider true-up process.

6.Commitments and Contingencies

Except to the extent noted below and in Note 5 to the consolidated financial statements, the circumstances set forth in Notes 11 and 12 to the consolidated financial statements included in PSCo’s Annual Report on Form 10-K for the year ended Dec. 31, 2017 and in Notes 5 and 6 to PSCo’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018, appropriately represent, in all material respects, the current status of commitments and contingent liabilities and are incorporated herein by reference. The following include commitments, contingencies and unresolved contingencies that are material to PSCo’s financial position.

PPAs

PSCo purchases power from independent power producing entities that own natural gas fueled power plants for which PSCo is required to reimburse natural gas fuel costs, or to participate in tolling arrangements under which PSCo procures the natural gas required to produce the energy that it purchases. These specific PPAs create a variable interest in the associated independent power producing entity.

PSCo had approximately 1,571 Megawatts (MW) of capacity under long-term PPAs as of June 30, 2018 and Dec. 31, 2017, with entities that have been determined to be variable interest entities. PSCo has concluded that these entities are not required to be consolidated in its consolidated financial statements because it does not have the power to direct the activities that most significantly impact the entities’ economic performance. These agreements have various expiration dates through 2032.

Environmental Contingencies

Manufactured Gas Plant (MGP), Landfill or Disposal Sites — PSCo is currently involved in investigating and/or remediating several MGP, landfill or other disposal sites. PSCo has identified four sites where contamination is present and where investigation and/or remediation activities are currently underway. Other parties may have responsibility for some portion of the investigation and/or remediation activities. PSCo anticipates that these investigation or remediation activities will continue through at least 2018. PSCo accrued $2 million as of June 30, 2018 and an immaterial amount as of Dec. 31, 2017, for these sites. There may be insurance recovery and/or recovery from other potentially responsible parties that will offset any costs incurred. PSCo anticipates that any amounts spent will be fully recovered from customers.

Environmental Requirements

Air
Revisions to the National Ambient Air Quality Standard (NAAQS) for Ozone - In 2015, the EPA revised the NAAQS for ozone by lowering the eight-hour standard from 75 parts per billion (ppb) to 70 ppb. PSCo meets the 2015 ozone standard in all areas where its generating units operate, except for the Denver Metropolitan Area. PSCo’s retirement of its coal fired plants in the Denver non-attainment area helped Colorado’s plan to mitigate non-attainment. In June 2018, the EPA designated the parts of the Denver Metropolitan Area that currently do not attain the 2008 ozone standards as also not attaining the more stringent 2015 ozone standard. Colorado will continue to consider further reductions that are available in the non-attainment area as it develops plans to meet the ozone standards. The gas plants that operate in PSCo’s non-attainment area may be required to improve or add controls, implement further work practices and/or implement enhanced emissions monitoring as part of future Colorado state plans.

Legal Contingencies

PSCo is involved in various litigation matters that are being defended and handled in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for such losses that are probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss. For current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on PSCo’s financial statements. Unless otherwise required by GAAP, legal fees are expensed as incurred.

Employment, Tort and Commercial Litigation

Line Extension Disputes — In December 2015, Development Recovery Company (DRC) filed a lawsuit in the Denver District Court, stating PSCo failed to award proper allowances and refunds for line extensions to new developments pursuant to the terms of electric and gas service agreements entered into by PSCo and various developers. The dispute involved claims by over fifty developers. In February 2018, the Colorado Supreme Court denied DRC’s petition to appeal the Denver District Court’s dismissal of the lawsuit, effectively terminating this litigation. However, in January 2018, DRC filed a new lawsuit in Boulder County District Court, asserting a single claim that PSCo was required to file its line extension agreements with the CPUC but failed to do so. This claim is substantially similar to the arguments previously raised by DRC. PSCo filed a motion to dismiss this claim, which was granted in May 2018. DRC subsequently filed an appeal to the Colorado Court of Appeals. It is uncertain when a decision will be rendered regarding this appeal.
PSCo has concluded that a loss is remote with respect to this matter as the service agreements were developed to implement CPUC approved tariffs and PSCo has complied with the tariff provisions. Also, if a loss were sustained, PSCo believes it would be allowed to recover these costs through traditional regulatory mechanisms. The amount or range in dispute is presently unknown and no accrual has been recorded for this matter.


7.Borrowings and Other Financing Instruments

Short-Term Borrowings

PSCo meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under its credit facility and the money pool.
Money Pool — Xcel Energy Inc. and its utility subsidiaries have established a money pool arrangement that allows for short-term investments in and borrowings between the utility subsidiaries. Xcel Energy Inc. may make investments in the utility subsidiaries at market-based interest rates; however, the money pool arrangement does not allow the utility subsidiaries to make investments in Xcel Energy Inc. Money pool borrowings for PSCo were as follows:
(Amounts in Millions, Except Interest Rates) Three Months Ended June 30, 2019 Year Ended Dec. 31, 2018
Borrowing limit $250
 $250
Amount outstanding at period end 50
 
Average amount outstanding 3
 25
Maximum amount outstanding 50
 156
Weighted average interest rate, computed on a daily basis 2.41% 1.93%
Weighted average interest rate at period end 2.41
 N/A

(Amounts in Millions, Except Interest Rates) Three Months Ended June 30, 2018 Year Ended Dec. 31, 2017
Borrowing limit $250
 $250
Amount outstanding at period end 
 
Average amount outstanding 60
 
Maximum amount outstanding 156
 20
Weighted average interest rate, computed on a daily basis 1.84% 0.92%
Weighted average interest rate at period end N/A
 N/A

Commercial Paper PSCo meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under its credit facility and the money pool. Commercial paper outstanding for PSCo was as follows:
(Amounts in Millions, Except Interest Rates) Three Months Ended June 30, 2019 Year Ended Dec. 31, 2018
Borrowing limit $700
 $700
Amount outstanding at period end 221
 307
Average amount outstanding 244
 55
Maximum amount outstanding 432
 309
Weighted average interest rate, computed on a daily basis 2.65% 2.28%
Weighted average interest rate at period end 2.59
 2.95

(Amounts in Millions, Except Interest Rates) Three Months Ended June 30, 2018 Year Ended Dec. 31, 2017
Borrowing limit $700
 $700
Amount outstanding at period end 
 
Average amount outstanding 84
 54
Maximum amount outstanding 257
 268
Weighted average interest rate, computed on a daily basis 2.17% 1.08%
Weighted average interest rate at period end N/A
 N/A

Letters of Credit PSCo uses letters of credit, generally with terms of one year, to provide financial guarantees for certain operating obligations. At June 30, 2018 and Dec. 31, 2017, thereThere were $4$10 million and $3 million, respectively, of letters of credit outstanding under the credit facility.facility at June 30, 2019 and Dec. 31, 2018. The contract amounts of these letters of credit approximate their fair value and are subject to fees.

Credit Facility — In order to use its commercial paper program to fulfill short-term funding needs, PSCo must have a revolving credit facility in place at least equal to the amount of its commercial paper borrowing limit and cannot issue commercial paper in an aggregate amount exceeding available capacity under this credit facility. The credit facility provides short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.

At June 30, 2018,2019, PSCo had the following committed credit facility available (in millions of dollars):
Credit Facility (a)
Credit Facility (a)
 
Drawn (b)
 Available
Credit Facility (a)
 
Outstanding (b)
 Available
$700
 $4
 $696
700
 $231
 $469

(a)    This credit facility expires in June 2021.2024.
(b)    Includes outstanding commercial paper and letters of credit.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the credit facility. PSCo had no direct advances on the credit facility outstanding at June 30, 20182019 and Dec. 31, 2017.2018.

Long-Term Borrowings

During the six months ended June 30, 2019, PSCo issued $350$400 million of 3.70 percent4.05% first mortgage green bonds due JuneSep. 15, 2028 and $350 million of 4.10 percent first mortgage green bonds due June 15, 2048.2049.


8.5.Revenues
Revenue is classified by the type of goods/services rendered and market/customer type. PSCo’s operating revenues consists of the following:
  Three Months Ended June 30, 2019
(Millions of Dollars) Electric Natural Gas All Other Total
Major revenue types        
Revenue from contracts with customers:        
Residential $211.5
 $130.1
 $2.8
 $344.4
C&I 384.4
 49.4
 5.7
 439.5
Other 11.8
 
 
 11.8
Total retail 607.7
 179.5
 8.5
 795.7
Wholesale 29.1
 
 
 29.1
Transmission 11.6
 
 
 11.6
Other 6.5
 23.3
 
 29.8
Total revenue from contracts with customers 654.9
 202.8
 8.5
 866.2
Alternative revenue and other 37.8
 4.8
 1.2
 43.8
Total revenues $692.7
 $207.6
 $9.7
 $910.0
  Three Months Ended June 30, 2018
(Millions of Dollars) Electric Natural Gas All Other Total
Major revenue types        
Revenue from contracts with customers:        
Residential $222.7
 $104.0
 $2.6
 $329.3
C&I 383.7
 38.9
 5.3
 427.9
Other 11.4
 
 
 11.4
Total retail 617.8
 142.9
 7.9
 768.6
Wholesale 36.2
 
 
 36.2
Transmission 13.2
 
 
 13.2
Other 14.7
 18.8
 
 33.5
Total revenue from contracts with customers 681.9
 161.7
 7.9
 851.5
Alternative revenue and other 34.3
 25.0
 1.1
 60.4
Total revenues $716.2
 $186.7
 $9.0
 $911.9

  Six Months Ended June 30, 2019
(Millions of Dollars) Electric Natural Gas All Other Total
Major revenue types        
Revenue from contracts with customers:        
Residential $456.6
 $441.5
 $5.3
 $903.4
C&I 752.3
 169.7
 14.5
 936.5
Other 24.3
 
 
 24.3
Total retail 1,233.2
 611.2
 19.8
 1,864.2
Wholesale 86.4
 
 
 86.4
Transmission 25.0
 
 
 25.0
Other 18.1
 54.9
 
 73.0
Total revenue from contracts with customers 1,362.7
 666.1
 19.8
 2,048.6
Alternative revenue and other 71.5
 10.6
 2.3
 84.4
Total revenues $1,434.2
 $676.7
 $22.1
 $2,133.0
  Six Months Ended June 30, 2018
(Millions of Dollars) Electric Natural Gas All Other Total
Major revenue types        
Revenue from contracts with customers:        
Residential $450.3
 $331.8
 $5.2
 $787.3
C&I 727.0
 124.9
 12.5
 864.4
Other 23.6
 
 0.1
 23.7
Total retail 1,200.9
 456.7
 17.8
 1,675.4
Wholesale 84.1
 
 
 84.1
Transmission 25.4
 
 
 25.4
Other 33.5
 43.8
 
 77.3
Total revenue from contracts with customers 1,343.9
 500.5
 17.8
 1,862.2
Alternative revenue and other 70.6
 50.1
 2.3
 123.0
Total revenues $1,414.5
 $550.6
 $20.1
 $1,985.2

6.Income Taxes
Except to the extent noted below, Note 8 to the consolidated financial statements included in PSCo’s Annual Report on Form 10-K for the year ended Dec. 31, 2018 represents, in all material respects, the current status of other income tax matters, and are incorporated herein by reference.
The following table reconciles the difference between the statutory rate and the ETR:
  Six Months Ended June 30
  2019 2018
Federal statutory rate 21.0 % 21.0 %
State tax (net of federal tax effect) 3.7
 3.7
Increases (decreases) in tax from: 
 
Wind PTCs (9.4) 
Plant regulatory differences (a)
 (3.4) (1.5)
Other tax credits and allowances (net) (1.0) (1.0)
Other (net) 0.1
 0.3
Effective income tax rate 11.0 % 22.5 %

(a)
Regulatory differences for income tax primarily relate to the flow back of excess deferred taxes to customers through the average rate assumption method and the impact of AFUDC - Equity. Year-to-date variations primarily relates to the deferral of the flow back of excess deferred taxes in 2018, as a result of pending regulatory decisions. Treatment of most tax reform items was established prior to the first quarter of 2019, resulting in a reduction in deferred amounts. Income tax benefits associated with the flow back of excess deferred credits are offset by corresponding revenue reductions and additional prepaid pension asset amortization.
Federal Audits PSCO is a member of the Xcel Energy affiliated group that files a consolidated federal income tax return. Statute of limitations applicable to Xcel Energy’s federal income tax returns expire as follows:
Tax Year(s)Expiration
2009 - 2013June 2020
2014 - 2016September 2020
2017September 2021

In 2015, the IRS commenced an examination of tax years 2012 and 2013. In 2017, the IRS concluded the audit of tax years 2012 and 2013 and proposed an adjustment that would impact Xcel Energy’s NOL and ETR. Xcel Energy filed a protest with the IRS. As of June 30, 2019, the case has been forwarded to Office of Appeals and Xcel Energy has recognized its best estimate of income tax expense that will result from a final resolution of this issue; however, the outcome and timing of a resolution is unknown.
In 2018, the IRS began an audit of tax years 2014 - 2016. As of June 30, 2019 no adjustments have been proposed.
State Audits — PSCo is a member of the Xcel Energy affiliated group that files consolidated state income tax returns. As of June 30, 2019, PSCo’s earliest open tax year that is subject to examination by state taxing authorities under applicable statutes of limitations is 2009. There are currently no state income tax audits in progress.
Unrecognized Benefits — Unrecognized tax benefit balance includes permanent tax positions, which if recognized would affect the annual ETR. In addition, the unrecognized tax benefit balance includes temporary tax positions for which the ultimate deductibility is highly certain, but for which there is uncertainty about the timing of such deductibility. A change in the period of deductibility would not affect the ETR but would accelerate the payment to the taxing authority to an earlier period.
Unrecognized tax benefits - permanent vs temporary:
(Millions of Dollars) June 30, 2019 Dec. 31, 2018
Unrecognized tax benefit — Permanent tax positions $6.0
 $5.4
Unrecognized tax benefit — Temporary tax positions 4.7
 4.9
Total unrecognized tax benefit $10.7
 $10.3


Unrecognized tax benefits were reduced by tax benefits associated with NOL and tax credit carryforwards:
(Millions of Dollars) June 30, 2019 Dec. 31, 2018
NOL and tax credit carryforwards $(6.1) $(5.6)

Net deferred tax liability associated with the unrecognized tax benefit amounts and related NOLs and tax credits carryforwards were $2.6 million and $2.0 million for June 30, 2019 and Dec. 31, 2018, respectively.
As the IRS Appeals and federal audit progress, it is reasonably possible that the amount of unrecognized tax benefit could decrease up to approximately $8.7 million in the next 12 months.
Payables for interest related to unrecognized tax benefits were not material and no amounts were accrued for penalties related to unrecognized tax benefits as of June 30, 2019 or Dec. 31, 2018.
7.Fair Value of Financial Assets and Liabilities

Fair Value Measurements

The accounting guidance for fair value measurements and disclosures provides a single definition of fair value, hierarchical framework for measuring assets and liabilities and requires certain disclosuresdisclosure about assets and liabilities measured at fair value. A hierarchical framework for disclosing the observability of the inputs utilized in measuring assets and liabilities at fair value is established by this guidance. The three levels in the hierarchy are as follows:

Level 1 Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. The types of assets and liabilities included in Level 1 are highly liquid and actively traded instruments with quoted prices.

Level 2 Pricing inputs are other than quoted prices in active markets, but are either directly or indirectly observable as of the reporting date. The types of assets and liabilities included in Level 2 are typically either comparable to actively traded securities or contracts, or priced with models using highly observable inputs.

Level 3 Significant inputs to pricing have little or no observability as of the reporting date. The types of assets and liabilities included in Level 3 are those valued with models requiring significant management judgment or estimation.

Specific valuation methods include the following:include:

Cash equivalents — The fair values of cash equivalents are generally based on cost plus accrued interest; money market funds are measured using quoted net asset value.

Interest rate derivatives— The fair values of interest rate derivatives are based on broker quotes that utilize current market interest rate forecasts.

Commodity derivatives— The methods used to measure the fair value of commodity derivative forwards and options generally utilize observable forward prices and volatilities, as well as observable pricing adjustments for specific delivery locations, and are generally assigned a Level 2 classification. When contractual settlements relate to delivery locations for which pricing is relatively unobservable, or extend to periods beyond those readily observable on active exchanges or quoted by brokers, the significance of the use of less observable forecasts of long-term forward prices and volatilitiesinputs on a valuation is evaluated, and may result in Level 3 classification.

Derivative Instruments Fair Value Measurements

PSCo enters into derivative instruments, including forward contracts, futures, swaps and options, for trading purposes and to manage risk in connection with changes in interest rates, utility commodity prices and vehicle fuel prices.

Interest Rate Derivatives PSCo enters into various instruments that effectively fix the interest payments on certain floating rate debt obligations or effectively fix the yield or price on a specified benchmark interest rate for an anticipated debt issuance for a specific period. These derivative instruments are generally designated as cash flow hedges for accounting purposes.

At June 30, 2018,2019, accumulated other comprehensive lossesloss related to interest rate derivatives included $1.2 million of net losses expected to be reclassified into earnings during the next 12 months as the related hedged interest rate transactions impact earnings, including forecasted amounts for unsettled hedges, as applicable.

Wholesale and Commodity Trading Risk PSCo conducts various wholesale and commodity trading activities, including the purchase and sale of electric capacity, energy, energy-related instruments and natural gas relatedgas-related instruments, including derivatives. PSCo’s risk management policy allows managementPSCo is allowed to conduct these activities within guidelines and limitations as approved by its risk management committee, which is made upcomprised of management personnel not directly involved in the activities governed by this policy.

Commodity Derivatives PSCo enters into derivative instruments to manage variability of future cash flows from changes in commodity prices in its electric and natural gas operations, as well as for trading purposes. This could include the purchase or sale of energy or energy-related products, natural gas to generate electric energy, natural gas for resale, and vehicle fuel.


PSCo entersmay enter into derivative instruments that mitigate commodity price risk on behalf of electric and natural gas customers but may not be designated as qualifying hedging transactions. Changes in the fair value of non-trading commodity derivative instruments are recorded inas other comprehensive income or deferred as a regulatory asset or liability. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms.
As of June 30, 2019, PSCo had no income related to the ineffectiveness ofcommodity contracts designated as cash flow hedges for the three and six months ended June 30, 2018 and 2017.hedges.

Additionally, PSCo also enters into commodity derivative instruments for trading purposes not directly related to commodity price risks associated with serving its electric and natural gas customers. Changes in the fair value of these commodity derivatives are recorded in electric operating revenues, net of amounts credited to customers under margin-sharing mechanisms.

The following table details the grossGross notional amounts of commodity forwards and options at June 30, 2018 and Dec. 31, 2017:options:
(Amounts in Thousands) (a)(b)
 June 30, 2018 Dec. 31, 2017
(Amounts in Millions) (a)(b)
 June 30, 2019 Dec. 31, 2018
Megawatt hours of electricity 20,813
 22,260
 16.3
 24.4
Million British thermal units of natural gas 18,798
 13,410
 51.3
 48.4
(a) 
Amounts are not reflective of net positions in the underlying commodities.
(b) 
Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.

Consideration of Credit Risk and Concentrations — PSCo continuously monitors the creditworthiness of the counterparties to its interest rate derivatives and commodity derivative contracts prior to settlement, and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. The following tables detail the impact of derivative activity duringcredit risk was immaterial to the three months ended June 30, 2018fair value of unsettled commodity derivatives presented in the consolidated balance sheets. PSCo’s most significant concentrations of credit risk with particular entities or industries are contracts with counterparties to its wholesale, trading and 2017 on accumulated other comprehensive loss, regulatory assets and liabilities, and income:
non-trading commodity activities.
  Three Months Ended June 30, 2018 
  
Pre-Tax Fair Value
Losses Recognized
During the Period in:
 
Pre-Tax Losses
Reclassified into Income
During the Period from:
   
(Thousands of Dollars) 
Accumulated
Other
Comprehensive
Loss
 
Regulatory
(Assets) and
Liabilities
 
Accumulated
Other
Comprehensive
Loss
 
Regulatory
Assets and
(Liabilities)
 
Pre-Tax Gains
Recognized
During the Period
in Income
 
Derivatives designated as cash flow hedges           
Interest rate $
 $
 $402
(a) 
$
 $
 
Total $
 $
 $402
 $
 $
 
Other derivative instruments           
Commodity trading $
 $
 $
 $
 $200
(b) 
Natural gas commodity 
 (249) 
 
 
(c) 
Total $
 $(249) $
 $
 $200
 
  Six Months Ended June 30, 2018 
  
Pre-Tax Fair Value
Losses Recognized
During the Period in:
 
Pre-Tax Losses
Reclassified into Income
During the Period from:
 
Pre-Tax (Gains) Losses
Recognized
During the Period
in Income
 
(Thousands of Dollars) 
Accumulated
Other
Comprehensive
Loss
 
Regulatory
(Assets) and
Liabilities
 
Accumulated
Other
Comprehensive
Loss
 
Regulatory
Assets and
(Liabilities)
  
Derivatives designated as cash flow hedges           
Interest rate $
 $
 $800
(a) 
$
 $
 
Total $
 $
 $800
 $
 $
 
Other derivative instruments  
         
Commodity trading $
 $
 $
 $
 $724
(b) 
Natural gas commodity 
 (420) 
 2,749
(c) 
(1,581)
(c) 
Total $
 $(420) $
 $2,749
 $(857) 

At June 30, 2019, six of PSCo’s 10 most significant counterparties for these activities, comprising $33.0 million or 49% of this credit exposure, had investment grade credit ratings from S&P Global Ratings, Moody’s Investor Services or Fitch Ratings. Three of the 10 most significant counterparties, comprising $7.7 million or 11% of this credit exposure, were not rated by these external agencies, but based on PSCo’s internal analysis, had credit quality consistent with investment grade. One of these significant counterparties, comprising $8.4 million or 12% of this credit exposure, had credit quality less than investment grade, based on external analysis. Seven of these significant counterparties are municipal or cooperative electric entities, or other utilities.
Impact of derivative activity:
  Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:
(Millions of Dollars) Accumulated Other
Comprehensive Loss
 Regulatory(Assets) and Liabilities
Three Months Ended June 30, 2019    
Other derivative instruments    
Natural gas commodity $
 $(1.5)
Total $
 $(1.5)
     
Six Months Ended June 30, 2019    
Other derivative instruments    
Natural gas commodity $
 $(1.5)
Total $
 $(1.5)
     
Three Months Ended June 30, 2018    
Other derivative instruments    
Natural gas commodity $
 $(0.2)
Total $
 $(0.2)
     
Six Months Ended June 30, 2018    
Other derivative instruments    
Natural gas commodity $
 $(0.4)
Total $
 $(0.4)
  Three Months Ended June 30, 2017 
  
Pre-Tax Fair Value
Losses Recognized
During the Period in:
 
Pre-Tax Losses
Reclassified into Income
During the Period from:
   
(Thousands of Dollars) 
Accumulated
Other
Comprehensive
Loss
 
Regulatory
(Assets) and
Liabilities
 
Accumulated
Other
Comprehensive
Loss
 
Regulatory
Assets and
(Liabilities)
 
Pre-Tax Losses
Recognized
During the Period
in Income
 
Derivatives designated as cash flow hedges           
Interest rate $
 $
 $403
(a) 
$
 $
 
Total $
 $
 $403
 $
 $
 
Other derivative instruments           
Commodity trading $
 $
 $
 $
 $(192)
(b) 
Natural gas commodity 
 (1,621) 
 
 
(c) 
Total $
 $(1,621) $
 $
 $(192) 
 Pre-Tax (Gains) Losses
Reclassified into Income
During the Period from:
 
Pre-Tax Gains
(Losses) Recognized
During the Period in Income
 
(Millions of Dollars)Accumulated
Other
Comprehensive Loss
 Regulatory
Assets and (Liabilities)
  
Three Months Ended June 30, 2019      
Derivatives designated as cash flow hedges      
Interest rate$0.4
(a) 
$
 $
 
Total$0.4
 $
 $
 
Other derivative instruments      
Commodity trading$
 $
 $3.3
(b) 
Total$
 $
 $3.3
 
       
Six Months Ended June 30, 2019      
Derivatives designated as cash flow hedges      
Interest rate$0.8
(a) 
$
 $
 
Total$0.8
 $
 $
 
Other derivative instruments      
Commodity trading$
 $
 $4.7
(b) 
Natural gas commodity
 (1.3)
(c) 
(2.0)
(c) 
Total$
 $(1.3) $2.7
 
       
Three Months Ended June 30, 2018      
Derivatives designated as cash flow hedges      
Interest rate$0.4
(a) 
$
 $
 
Total$0.4
 $
 $
 
Other derivative instruments      
Commodity trading$
 $
 $0.2
(b) 
Total$
 $
 $0.2
 
       
Six Months Ended June 30, 2018      
Derivatives designated as cash flow hedges      
Interest rate$0.8
(a) 
$
 $
 
Total$0.8
 $
 $
 
Other derivative instruments      
Commodity trading$
 $
 $0.7
(b) 
Natural gas commodity
 2.7
(c) 
(1.6)
(c) 
Total$
 $2.7
 $(0.9) 
  Six Months Ended June 30, 2017 
  
Pre-Tax Fair Value
Losses Recognized
During the Period in:
 
Pre-Tax Losses
Reclassified into Income
During the Period from:
   
(Thousands of Dollars) 
Accumulated
Other
Comprehensive
Loss
 
Regulatory
(Assets) and
Liabilities
 
Accumulated
Other
Comprehensive
Loss
 
Regulatory
Assets and
(Liabilities)
 
Pre-Tax Gains (Losses)
Recognized
During the Period
in Income
 
Derivatives designated as cash flow hedges           
Interest rate $
 $
 $801
(a) 
$
 $
 
Total $
 $
 $801
 $
 $
 
Other derivative instruments           
Commodity trading $
 $
 $
 $
 $187
(b) 
Natural gas commodity 
 (7,008) 
 282
(c) 
(2,990)
(c) 
Total $
 $(7,008) $
 $282
 $(2,803) 


(a) 
Amounts are recorded to interest charges.
(b) 
Amounts are recorded to interest charges. Amounts are recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue as appropriate.
(c) 
CertainAmounts for both the three and six months ended June 30, 2019 included no settlement gain or losses on derivatives are utilizedentered to mitigate natural gas price risk for electric generation and are recorded to electric fuel and purchased power, subject to cost-recovery mechanisms and reclassified to a regulatory asset, as appropriate. Amounts for the three and six months ended June 30, 2018 included no such settlement gains or losses and $1.2 million of such settlement losses, respectively. AmountsRemaining derivative settlement losses for the three and six months ended June 30, 2017 included no settlement gains or losses2019 and $0.9 million of settlement gains, respectively. The remaining derivative settlement gains and losses for the six months ended June 30, 2018 and 2017 relate to natural gas operations and are recorded to cost of natural gas sold and transported. These gains and losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset or liability, as appropriate.

PSCo had no derivative instruments designated as fair value hedges during the three and six months ended June 30, 20182019 and 2017. Therefore, no gains or losses from fair value hedges or related hedged transactions were recognized for these periods.2018.

Consideration of Credit Risk and Concentrations — PSCo continuously monitors the creditworthiness of the counterparties to its interest rate derivatives and commodity derivative contracts prior to settlement, and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. Given this assessment, as well as an assessment of the impact of PSCo’s own credit risk when determining the fair value of derivative liabilities, the impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented in the consolidated balance sheets.

PSCo employs additional credit risk control mechanisms when appropriate, such as letters of credit, parental guarantees, standardized master netting agreements and termination provisions that allow for offsetting of positive and negative exposures. Credit exposure is monitored and, when necessary, the activity with a specific counterparty is limited until credit enhancement is provided.


PSCo’s most significant concentrations of credit risk with particular entities or industries are contracts with counterparties to its wholesale, trading and non-trading commodity activities. At June 30, 2018, four of PSCo’s 10 most significant counterparties for these activities, comprising $27.6 million or 47 percent of this credit exposure, had investment grade credit ratings from Standard & Poor’s, Moody’s or Fitch Ratings. Five of the 10 most significant counterparties, comprising $12.2 million or 21 percent of this credit exposure, were not rated by these external agencies, but based on PSCo’s internal analysis, had credit quality consistent with investment grade. The one remaining significant counterparty, comprising $5.2 million or 9 percent of this credit exposure, had credit quality less than investment grade, based on ratings from external analysis. Nine of these significant counterparties are municipal or cooperative electric entities, or other utilities.

Credit Related Contingent FeaturesContract provisions for derivative instruments that PSCo enters into, including those accounted for as normal purchase-normal sale contracts and therefore not reflected on the consolidated balance sheet,sheets, may require the posting of collateral or settlement of the contracts for various reasons, including if PSCo’s credit ratings are downgraded below its investment grade credit rating by any of the major credit rating agencies, or for cross-default contractual provisions that could result in the settlement of such contracts if there was a failure under other financing arrangements related to payment terms or other covenants. At June 30, 20182019 and Dec. 31, 2017,2018, there were no derivative instruments in a material liability position with such underlying contract provisions.provisions with no offsetting positions or posted collateral.

Certain derivative instruments are also subject to contract provisions that contain adequate assurance clauses. These provisions allow counterparties to seek performance assurance, including cash collateral, in the event that PSCo’s ability to fulfill its contractual obligations is reasonably expected to be impaired. PSCo had no collateral posted related to adequate assurance clauses in derivative contracts as of June 30, 20182019 and Dec. 31, 2017.2018.

Recurring Fair Value MeasurementsThe following table presents, for each of the fair value hierarchy levels, PSCo’s assets and liabilities measured at fair value on a recurring basis at June 30, 2018:basis:

  June 30, 2019 Dec. 31, 2018
  Fair Value Fair Value
Total
 
Netting (a)
   Fair Value Fair Value
Total
 
Netting (a)
  
(Millions of Dollars) Level 1 Level 2 Level 3   Total Level 1 Level 2 Level 3   Total
Current derivative assets                        
Other derivative instruments:                        
Commodity trading $5.4
 $33.3
 $0.2
 $38.9
 $(20.9) $18.0
 $2.3
 $65.0
 $0.1
 $67.4
 $(28.2) $39.2
Natural gas commodity 
 0.4
 
 0.4
 
 0.4
 
 3.4
 
 3.4
 
 3.4
Total current derivative assets $5.4
 $33.7
 $0.2
 $39.3
 $(20.9) 18.4
 $2.3
 $68.4
 $0.1
 $70.8
 $(28.2) 42.6
PPAs (b)
           
           
Current derivative instruments           $18.4
           $42.6
Noncurrent derivative assets                        
Other derivative instruments:                        
Commodity trading $0.2
 $4.6
 $
 $4.8
 $(2.3) $2.5
 $
 $1.6
 $
 $1.6
 $(0.4) $1.2
Total noncurrent derivative assets $0.2
 $4.6
 $
 $4.8
 $(2.3) 2.5
 $
 $1.6
 $
 $1.6
 $(0.4) 1.2
PPAs (b)
           
           
Noncurrent derivative instruments           $2.5
           $1.2
  June 30, 2018
  Fair Value 
Fair Value
Total
 
Counterparty
Netting (b)
  
(Thousands of Dollars) Level 1 Level 2 Level 3   Total
Current derivative assets            
Other derivative instruments:            
Commodity trading $332
 $12,812
 $118
 $13,262
 $(9,729) $3,533
Natural gas commodity 
 919
 
 919
 
 919
Total current derivative assets $332
 $13,731
 $118
 $14,181
 $(9,729) 4,452
PPAs (a)
           888
Current derivative instruments           $5,340
Noncurrent derivative assets            
Other derivative instruments:            
Commodity trading $1
 $2,715
 $
 $2,716
 $
 $2,716
Total noncurrent derivative assets $1
 $2,715
 $
 $2,716
 $
 2,716
PPAs (a)
           
Noncurrent derivative instruments           $2,716


 June 30, 2018 June 30, 2019 Dec. 31, 2018
 Fair Value 
Fair Value
Total
 
Counterparty
Netting (b)
   Fair Value Fair Value
Total
 
Netting (a)
   Fair Value Fair Value
Total
 
Netting (a)
  
(Thousands of Dollars) Level 1 Level 2 Level 3 Total
(Millions of Dollars) Level 1 Level 2 Level 3 Fair Value
Total
 
Netting (a)
 Total Level 1 Level 2 Level 3 Fair Value
Total
 
Netting (a)
 Total
Current derivative liabilities                            
Other derivative instruments:                                    
Commodity trading $333
 $12,409
 $
 $12,742
 $(12,474) $268
 $5.5
 $31.4
 $
 $36.9
 $(27.3) $9.6
 $2.4
 $64.2
 $
 $66.6
 $(34.7) $31.9
Total current derivative liabilities $333
 $12,409
 $
 $12,742
 $(12,474) 268
 $5.5
 $31.4
 $
 $36.9
 $(27.3) 9.6
 $2.4
 $64.2
 $
 $66.6
 $(34.7) 31.9
PPAs (a)
           5,160
PPAs (b)
           0.1
           2.7
Current derivative instruments           $5,428
           $9.7
           $34.6
Noncurrent derivative liabilities                                    
Other derivative instruments:                                    
Commodity trading $
 $2,382
 $
 $2,382
 $
 $2,382
 $0.2
 $2.7
 $
 $2.9
 $(2.3) $0.6
 $
 $1.1
 $
 $1.1
 $(0.5) $0.6
Total noncurrent derivative liabilities $
 $2,382
 $
 $2,382
 $
 2,382
 $0.2
 $2.7
 $
 $2.9
 $(2.3) 0.6
 $
 $1.1
 $
 $1.1
 $(0.5) 0.6
PPAs (a)
           89
PPAs (b)
           
           
Noncurrent derivative instruments           $2,471
           $0.6
           $0.6
(a) 
During 2006, PSCo qualified these contracts under the normal purchase exception. Based onthis qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts is being amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.
(b)
PSCo nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2019 and Dec. 31, 2018. At both June 30, 2019 and Dec. 31, 2018, derivative assets and liabilities include no obligations to return cash collateralcollateral. At June 30, 2019 and Dec. 31, 2018, derivative assets and liabilities include the rights to reclaim cash collateral of $2.7 million.$6.4 million and $6.5 million, respectively. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

The following table presents, for each of the fair value hierarchy levels, PSCo’s assets and liabilities measured at fair value on a recurring basis at Dec. 31, 2017:
  Dec. 31, 2017
  Fair Value 
Fair Value
Total
 
Counterparty
Netting (b)
  
(Thousands of Dollars) Level 1 Level 2 Level 3   Total
Current derivative assets            
Other derivative instruments:            
Commodity trading $528
 $4,488
 $12
 $5,028
 $(3,554) $1,474
Natural gas commodity 
 18
 
 18
 (10) 8
Total current derivative assets $528
 $4,506
 $12
 $5,046
 $(3,564) 1,482
PPAs (a)
           1,715
Current derivative instruments           $3,197
Noncurrent derivative assets            
Other derivative instruments:    
    
  
  
Commodity trading $
 $1,541
 $
 $1,541
 $(563) $978
Total noncurrent derivative assets $
 $1,541
 $
 $1,541
 $(563) 978
PPAs (a)
           31
Noncurrent derivative instruments           $1,009



  Dec. 31, 2017
  Fair Value 
Fair Value
Total
 
Counterparty
Netting (b)
  
(Thousands of Dollars) Level 1 Level 2 Level 3   Total
Current derivative liabilities            
Other derivative instruments:            
Commodity trading $446
 $4,285
 $6
 $4,737
 $(3,431) $1,306
Natural gas commodity 
 1,016
 
 1,016
 (10) 1,006
Total current derivative liabilities $446
 $5,301
 $6
 $5,753
 $(3,441) 2,312
PPAs (a)
           5,036
Current derivative instruments           $7,348
Noncurrent derivative liabilities            
Commodity trading $
 $1,362
 $
 $1,362
 $(563) $799
Total noncurrent derivative liabilities $
 $1,362
 $
 $1,362
 $(563) 799
PPAs (a)
           $2,669
Noncurrent derivative instruments           $3,468

(a)(b) 
During 2006, PSCo qualified these contracts under the normal purchase exception. Based onthis qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts is beingwill be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.
(b)
PSCo nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at Dec. 31, 2017. At Dec. 31, 2017, derivative assets and liabilities include no obligations to return cash collateral or rights to reclaim cash collateral. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

There were $0.1$0.3 million and $1.0 million of gains recognized in earnings for Level 3 commodity trading derivatives in the three and six months ended June 30, 2018.2019, respectively. There were immaterial$0.1 million of gains and losses recognized in earnings for Level 3 commodity trading derivatives in both the three and six months ended June 30, 2017.

2018.
PSCo recognizes transfers between fair value hierarchy levels as of the beginning of each period. There were no transfers of amounts between levels for derivative instruments for the three and six months ended June 30, 20182019 and 2017.2018.

Fair Value of Long-Term Debt

As of June 30, 2018 and Dec. 31, 2017, otherOther financial instruments for which the carrying amount did not equal fair value were as follows:value:
  June 30, 2019 Dec. 31, 2018
(Millions of Dollars) 
Carrying
Amount
 Fair Value 
Carrying
Amount
 Fair Value
Long-term debt, including current portion $4,846.1
 $5,333.3
 $4,997.6
 $5,123.2

  June 30, 2018 Dec. 31, 2017
(Thousands of Dollars) 
Carrying
Amount
 Fair Value 
Carrying
Amount
 Fair Value
Long-term debt, including current portion $5,300,062
 $5,464,543
 $4,608,275
 $5,024,840

The fairFair value of PSCo’s long-term debt is estimated based on recent trades and observable spreads from benchmark interest rates for similar securities. The fairFair value estimates are based on information available to management as of June 30, 20182019 and Dec. 31, 2017,2018, and given the observability of the inputs, to these estimates, the fair values presented for long-term debt have beenwere assigned aas Level 2.

8.Benefit Plans and Other Postretirement Benefits
Components of Net Periodic Benefit Cost (Credit)
  Three Months Ended June 30
  2019 2018 2019 2018
(Millions of Dollars) Pension Benefits Postretirement Health
Care Benefits
Service cost $6.4
 $7.3
 $0.1
 $0.2
Interest cost (a)
 12.9
 11.8
 3.9
 3.8
Expected return on plan assets (a)
 (17.1) (17.1) (4.7) (5.7)
Amortization of prior service credit (a)
 (0.8) (0.9) (1.3) (1.6)
Amortization of net loss (a)
 6.3
 7.8
 0.7
 1.0
Net periodic benefit cost (credit) 7.7
 8.9
 (1.3) (2.3)
Credits not recognized due to the effects of regulation 1.8
 0.9
 0.2
 
Net benefit cost (credit) recognized for financial reporting $9.5
 $9.8
 $(1.1) $(2.3)
  Six Months Ended June 30
  2019 2018 2019 2018
(Millions of Dollars) Pension Benefits Postretirement Health
Care Benefits
Service cost $12.8
 $14.6
 $0.2
 $0.3
Interest cost (a)
 25.8
 23.6
 7.8
 7.5
Expected return on plan assets (a)
 (34.2) (34.3) (9.4) (11.3)
Amortization of prior service credit (a)
 (1.7) (1.7) (2.7) (3.1)
Amortization of net loss (a)
 12.7
 15.6
 1.5
 2.0
Net periodic benefit cost (credit) 15.4
 17.8
 (2.6) (4.6)
Credits not recognized due to the effects of regulation 3.6
 2.4
 0.5
 
Net benefit cost (credit) recognized for financial reporting $19.0
 $20.2
 $(2.1) $(4.6)

(a)
The components of net periodic cost other than the service cost component are included in the line item “other income, net” in the consolidated statement of income or capitalized on the consolidated balance sheet as a regulatory asset.
In January 2019, contributions of $150 million were made across four of Xcel Energy’s pension plans, of which $43 million was attributable to PSCo. On July 1, 2019, Xcel Energy made a $4 million contribution to the Xcel Energy Inc. Non-Bargaining Pension Plan (South), of which $3 million was attributable to PSCo, and does not expect any additional pension contributions during 2019.
9.Other Income, NetCommitments and Contingencies
Legal Contingencies
PSCo is involved in various litigation matters in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for losses probable of being incurred and subject to reasonable estimation.
Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to, when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss. For current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, would have a material effect on PSCo’s financial statements. Unless otherwise required by GAAP, legal fees are expensed as incurred.
Gas Trading Litigation e prime is a wholly owned subsidiary of Xcel Energy. e prime was in the business of natural gas trading and marketing but has not engaged in natural gas trading or marketing activities since 2003.  Multiple lawsuits seeking monetary damages were commenced against e prime and its affiliates, including Xcel Energy, between 2003 and 2009 alleging fraud and anticompetitive activities in conspiring to restrain the trade of natural gas and manipulate natural gas prices. Cases were all consolidated in the U.S. District Court in Nevada.
Two cases remain active which include an MDL matter consisting of a Colorado purported class (Breckenridge) and a Wisconsin purported class (Arandell Corp.).
Breckenridge/Colorado - The MDL panel remanded Breckenridge back to the U.S. District Court in Colorado and assigned to a judge.

Other income, net consisted
Arandell Corp. - In February 2019, Xcel Energy filed a no opposition motion to have the case remanded back to the U.S. District Court in Wisconsin. The motion was granted and the case has been remanded back to the District Court.
Xcel Energy has concluded that a loss is remote for both remaining lawsuits.
Employment, Tort and Commercial Litigation
Line Extension Disputes — In December 2015, the DRC filed a lawsuit seeking monetary damages in the Denver District Court, stating PSCo failed to award proper allowances and refunds for line extensions to new developments pursuant to the terms of electric and gas service agreements. The dispute involves claims by over fifty developers. In February 2018, the Colorado Supreme Court denied DRC’s petition to appeal the Denver District Court’s dismissal of the following:lawsuit, effectively terminating this litigation. However, in January 2018, DRC filed a new lawsuit in Boulder County District Court, asserting a single claim that PSCo was required to file its line extension agreements with the CPUC but failed to do so.
This claim is similar to the arguments previously raised by DRC. PSCo filed a motion to dismiss this claim, which was granted in May 2018. DRC subsequently filed an appeal to the Colorado Court of Appeals. Briefs have been filed and it is uncertain when a decision will be rendered.
PSCo has concluded that a loss is remote with respect to both of these matters as the service agreements were developed to implement CPUC approved tariffs and PSCo has complied with the tariff provisions. If a loss were sustained, PSCo believes it would be allowed to recover costs through traditional regulatory mechanisms. Amount or range in dispute is presently unknown and no accrual has been recorded for this matter.
Environmental
MGP, Landfill or Disposal Sites — PSCo is cooperating with the City of Denver on an environmental investigation of the Rice Yards Site in the Central Platte Valley of Denver, Colorado, which had various historic industrial uses by multiple parties, including railroad, maintenance shop, scrap metal yard, and MGP operations. In the 1990’s, environmental remediation activities took place at the site under state oversight to accommodate the development of an amusement park and parking lots. The area is being redeveloped into residential and commercial mixed uses, and PSCo is in discussions with the current property owner regarding legal claims related to the Rice Yards Site.
In addition, PSCo is currently investigating or remediating two other MGP, landfill or other disposal sites across its service territories.
PSCo has recognized its best estimate of costs/liabilities that will result from final resolution of these issues, however, the outcome and timing is unknown.  In addition, there may be insurance recovery and/or recovery from other potentially responsible parties, offsetting a portion of the costs incurred.
Environmental Requirements — Water and Waste
Coal Ash RegulationPSCo’s operations are subject to federal and state laws that impose requirements for handling, storage, treatment and disposal of solid waste.
Under the CCR Rule, utilities are required to complete groundwater sampling around their CCR landfills and surface impoundments. By the end of 2019, only six of PSCo’s regulated ash units are expected to be in operation. PSCo is conducting groundwater sampling, and where appropriate, initiating the assessment of corrective measures and evaluating whether corrective action is required at any CCR landfills or surface impoundments.
Until PSCo completes its assessment, it is uncertain what impact, if any, there will be on the operations, financial condition or cash flows.
Leases
PSCo evaluates contracts that may contain leases, including PPAs and arrangements for the use of office space and other facilities, vehicles and equipment. Under ASC Topic 842, adopted by PSCo on Jan. 1, 2019, a contract contains a lease if it conveys the exclusive right to control the use of a specific asset. A contract determined to contain a lease is evaluated further to determine if the arrangement is a finance lease.
ROU assets represent PSCo's rights to use leased assets. Starting in 2019, the present value of future operating lease payments are recognized in other current liabilities and noncurrent operating lease liabilities. These amounts, adjusted for any prepayments or incentives, are recognized as operating lease ROU assets.
Most of PSCo’s leases do not contain a readily determinable discount rate. Therefore, the present value of future lease payments is calculated using the estimated incremental borrowing rate (weighted-average of 4.1%). PSCo has elected to utilize the practical expedient under which non-lease components, such as asset maintenance costs included in payments, are not deducted from minimum lease payments for the purposes of lease accounting and disclosure.
Leases with an initial term of 12 months or less are classified as short-term leases and are not recognized on the consolidated balance sheet.
Operating lease ROU assets:
(Millions of Dollars) June 30, 2019
PPAs $585.1
Other 68.3
Gross operating lease ROU assets 653.4
Accumulated amortization (39.7)
Net operating lease ROU assets $613.7

In 2019, ROU assets for finance leases are included in other noncurrent assets, and the present value of future finance lease payments is included in other current liabilities and other noncurrent liabilities. Prior to 2019, finance leases were included in property, plant and equipment, the current portion of long-term debt and long-term debt.
PSCo’s most significant finance lease activities are related to WYCO.WYCO is a joint venture with CIG to develop and lease natural gas pipeline, storage and compression facilities. Xcel Energy Inc. has a 50% ownership interest in WYCO. WYCO leases its facilities to CIG, and CIG operates the facilities, providing natural gas storage and transportation services to PSCo under separate service agreements.
PSCo accounts for its Totem natural gas storage service and Front Range pipeline arrangements with CIG and WYCO, respectively, as finance leases.
Finance lease ROU assets:
(Millions of Dollars) June 30, 2019
Gas storage facilities $200.5
Gas pipeline 20.7
Gross finance lease ROU assets 221.2
Accumulated amortization (79.2)
Net finance lease ROU assets $142.0


Components of lease expense:
  Three Months Ended June 30 Six Months Ended June 30
(Thousands of Dollars) 2018 2017 2018 2017
Interest income $508
 $609
 $372
 $984
Other nonoperating income 483
 1,326
 956
 4,747
Insurance policy expense (73) (103) (150) (182)
Benefits non-service cost (119) (513) (148) (1,026)
Other income, net $799
 $1,319
 $1,030
 $4,523
(Millions of Dollars) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019
Operating leases    
PPA capacity payments $24.7
 $49.0
Other operating leases (a)
 3.6
 7.2
Total operating lease expense (b)
 $28.3
 $56.2
     
Finance leases    
Amortization of ROU assets $1.5
 $3.0
Interest expense on lease liability 4.7
 9.5
Total finance lease expense $6.2
 $12.5
(a)
Includes short-term lease expense of $0.3 million for three months ended June 30, 2019 and $0.7 million for six months ended June 30, 2019.
(b)
PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.
Future commitments under operating and finance leases as of June 30, 2019:


(Millions of Dollars) 
PPA (a) (b)
Operating
Leases
 
Other Operating
Leases
 
Total
Operating
Leases
 Finance Leases
2019 $47.8
 $6.5
 $54.3
 $12.4
2020 95.9
 13.2
 109.1
 24.8
2021 96.4
 12.1
 108.5
 23.6
2022 82.6
 11.2
 93.8
 20.5
2023 70.0
 10.9
 80.9
 20.3
Thereafter 288.6
 29.2
 317.8
 420.4
Total minimum obligation 681.3
 83.1
 764.4
 522.0
Interest component of obligation (106.4) (13.8) (120.2) (380.0)
Present value of minimum obligation $574.9
 $69.3
 644.2
 142.0
Less current portion     (83.9) (6.5)
Noncurrent operating and finance lease liabilities     $560.3
 $135.5
         
Weighted-average remaining lease term in years     8.3
 39.0
(a)
Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.
(b)
PPA operating leases contractually expire at various dates through 2032.
Future commitments under operating and finance leases as of Dec. 31, 2018:
(Millions of Dollars) 
PPA (a) (b)
Operating
Leases
 
Other Operating
Leases
 
Total
Operating
Leases
 Finance Leases
2019 $95.5
 $10.8
 $106.3
 $24.9
2020 95.9
 10.7
 106.6
 24.8
2021 96.4
 9.5
 105.9
 23.6
2022 82.6
 8.4
 91.0
 20.5
2023 70.0
 8.1
 78.1
 20.3
Thereafter 288.6
 53.4
 342.0
 420.4
Total minimum obligation 

 

 

 534.5
Interest component of obligation       (389.5)
Present value of minimum obligation     $145.0
(a)
Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.
(b)
PPA operating leases contractually expire at various dates through 2032.
Variable Interest Entities
Under certain PPAs, PSCo purchases power from IPPs and is required to reimburse the IPPs for fuel costs, or to participate in tolling arrangements under which PSCo procures the natural gas required to produce the energy that it purchases. These specific PPAs create a variable interest in the associated IPP.
PSCo had approximately 1,442 MW and 1,571 MW of capacity under long-term PPAs as of June 30, 2019 and Dec. 31, 2018, respectively, with entities that have been determined to be VIEs. PSCo concluded that these entities are not required to be consolidated in its financial statements because it does not have the power to direct the activities that significantly impact the entities’ economic performance. These agreements have various expiration dates through 2032.
10.Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive loss, net of tax, for the three and six months ended June 30, 2019 and 2018:
  Three Months Ended June 30, 2019 Three Months Ended June 30, 2018
(Millions of Dollars) 
Gains and Losses
on Cash Flow Hedges
 
Defined Benefit Pension and
Postretirement Items
 Total 
Gains and Losses
on Cash Flow Hedges
 
Defined Benefit Pension and
Postretirement Items
 Total
Accumulated other comprehensive loss at April 1 $(25.0) $(0.2) $(25.2) $(26.1) $(0.3) $(26.4)
Losses reclassified from net accumulated other comprehensive loss:            
Interest rate derivatives (net of taxes of $0.1, $0, $0.1 and $0, respectively) (a)
 0.3
 
 0.3
 0.3
 
 0.3
Net current period other comprehensive income 0.3
 
 0.3
 0.3
 
 0.3
Accumulated other comprehensive loss at June 30 $(24.7) $(0.2) $(24.9) $(25.8) $(0.3) $(26.1)


  Six Months Ended June 30, 2019 Six Months Ended June 30, 2018
(Millions of Dollars) 
Gains and Losses
on Cash Flow Hedges
 
Defined Benefit Pension and
Postretirement Items
 Total 
Gains and Losses
on Cash Flow Hedges
 
Defined Benefit Pension and
Postretirement Items
 Total
Accumulated other comprehensive loss at Jan. 1 $(25.3) $(0.2) $(25.5) $(26.4) $(0.3) $(26.7)
Losses reclassified from net accumulated other comprehensive loss:            
Interest rate derivatives (net of taxes of $0.1, $0, $0.2 and $0, respectively) (a)
 0.6
 
 0.6
 0.6
 
 0.6
Net current period other comprehensive income 0.6
 
 0.6
 0.6
 
 0.6
Accumulated other comprehensive loss at June 30 $(24.7) $(0.2) $(24.9) $(25.8) $(0.3) $(26.1)

(a)
Included in interest charges.
11.Segment Information

Operating results from the regulated electric utility and regulated natural gas utility are each separately and regularly reviewed by PSCo’s chief operating decision maker. PSCo evaluates performance based on profit or loss generated from the product or service provided. These segments are managed separately because the revenue streams are dependent upon regulated rate recovery, which is separately determined for each segment.

PSCo has the following reportable segments: regulated electric utility, regulated natural gas utility and all other.

PSCo’s regulated electric utility segment generates, transmits and distributes electricity primarily in portions of Colorado. In addition, this segment includes sales for resale and provides wholesale transmission service to various entities in the United States. Regulated electric utility also includes PSCo’s commodity trading operations.
PSCo’s regulated natural gas utility segment transports, stores and distributes natural gas primarily in portions of Colorado.
Revenues from operating segments not included above are below the necessary quantitative thresholds and are therefore included in the all other category. Those primarily include steam revenue, appliance repair services and nonutility real estate activities.

Regulated Electric - The regulated electric utility segment generates electricity which is transmitted and distributed in Colorado. This segment includes sales for resale and provides wholesale transmission service to various entities in the United States. Regulated electric utility also includes PSCo’s wholesale commodity and trading operations.
Regulated Natural Gas - The regulated natural gas utility segment transports, stores and distributes natural gas in portions of Colorado.
All Other - Revenues from operating segments not included above are below the necessary quantitative thresholds are included in the all other category. Those primarily include steam revenue, appliance repair services and nonutility real estate activities.
Asset and capital expenditure information is not provided for PSCo’s reportable segments because as an integrated electric and natural gas utility, PSCo operates significant assets that are not dedicated to a specific business segment, and reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis.

To report income from operations for regulated electric and regulated natural gas utility segments, the majority of costs are directly assigned to each segment. However, someCertain costs, such as common depreciation, common operating and maintenance (O&M)O&M expenses and interest expense are allocated based on cost causation allocators. Aallocators across each segment. In addition, a general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.
(Thousands of Dollars) Regulated Electric Regulated Natural Gas All Other Reconciling Eliminations Consolidated Total
Three Months Ended June 30, 2018          
Operating revenues (a)(b)
 $716,195
 $186,661
 $9,010
 $
 $911,866
Intersegment revenues 76
 79
 
 (155) 
Total revenues $716,271
 $186,740
 $9,010
 $(155) $911,866
Net income (loss) $101,956
 $20,963
 $(623) $
 $122,296
(Thousands of Dollars) Regulated Electric Regulated Natural Gas All Other Reconciling Eliminations Consolidated Total
Three Months Ended June 30, 2017          
Operating revenues (a)(b)
 $729,920
 $192,777
 $8,219
 $
 $930,916
Intersegment revenues 67
 40
 
 (107) 
Total revenues $729,987
 $192,817
 $8,219
 $(107) $930,916
Net income $87,403
 $12,835
 $349
 $
 $100,587
(a)    Operating revenues include $0 million of affiliate electric revenue for the three months ended June 30, 2018 and 2017.
(b)    Operating revenues include $1 million of other affiliate revenue for the three months ended June 30, 2018 and 2017.
(Thousands of Dollars) Regulated
Electric
 Regulated
Natural Gas
 All
Other
 Reconciling
Eliminations
 Consolidated
Total
Six Months Ended June 30, 2018          
Operating revenues from external customers $1,414,469
 $550,647
 $20,048
 $
 $1,985,164
Intersegment revenues 188
 143
 
 (331) 
Total revenues $1,414,657
 $550,790
 $20,048
 $(331) $1,985,164
Net income (loss) $181,507
 $74,675
 $(164) $
 $256,018

(Thousands of Dollars) Regulated
Electric
 Regulated
Natural Gas
 All
Other
 Reconciling
Eliminations
 Consolidated
Total
Six Months Ended June 30, 2017    
      
Operating revenues from external customers $1,441,308
 $548,913
 $21,229
 $
 $2,011,450
Intersegment revenues 159
 96
 
 (255) 
Total revenues $1,441,467
 $549,009
 $21,229
 $(255) $2,011,450
Net income $163,547
 $47,318
 $1,268
 $
 $212,133
(a)    Operating revenues include $0 million and $1 million of affiliate electric revenue for the six months ended June 30, 2018 and 2017.
(b)    Operating revenues include $2 million of other affiliate revenue for the six months ended June 30, 2018 and 2017.

11.Benefit Plans and Other Postretirement Benefits

Components of Net Periodic Benefit Cost (Credit)
  Three Months Ended June 30
  2018 2017 2018 2017
(Thousands of Dollars) Pension Benefits 
Postretirement Health
Care Benefits
Service cost $7,271
 $6,820
 $152
 $192
Interest cost (a)
 11,814
 12,640
 3,748
 4,191
Expected return on plan assets (a)
 (17,130) (17,134) (5,674) (5,476)
Amortization of prior service credit (a)
 (845) (803) (1,544) (1,562)
Amortization of net loss (a)
 7,815
 7,089
 1,021
 961
Net periodic benefit cost (credit) 8,925
 8,612
 (2,297) (1,694)
Credits not recognized due to the effects of regulation 895
 426
 
 
Net benefit cost (credit) recognized for financial reporting $9,820
 $9,038
 $(2,297) $(1,694)

  Six Months Ended June 30
  2018 2017 2018 2017
(Thousands of Dollars) Pension Benefits Postretirement Health
Care Benefits
Service cost $14,542
 $13,640
 $304
 $384
Interest cost (a)
 23,628
 25,280
 7,497
 8,382
Expected return on plan assets (a)
 (34,260) (34,268) (11,349) (10,952)
Amortization of prior service credit (a)
 (1,690) (1,606) (3,089) (3,124)
Amortization of net loss (a)
 15,630
 14,178
 2,042
 1,922
Net periodic benefit cost (credit) 17,850
 17,224
 (4,595) (3,388)
Credits not recognized due to the effects of regulation 2,370
 1,162
 
 
Net benefit cost (credit) recognized for financial reporting $20,220
 $18,386
 $(4,595) $(3,388)

(a)
The components of net periodic cost other than the service cost component are included in the line item “other income, net” in the income statement or capitalized on the balance sheet as a regulatory asset.

In January 2018, contributions of $150 million were made across four of Xcel Energy’s pension plans, of which $22.0 million was attributable to PSCo. Xcel Energy does not expect additional pension contributions during 2018.


12.Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive loss, net of tax,PSCo’s segment information for the three and six months ended June 30, 2018 and 2017 were as follows:30:
  Three Months Ended June 30, 2018
(Thousands of Dollars) Gains and Losses on Cash Flow Hedges Defined Benefit and Postretirement Items Total
Accumulated other comprehensive loss at April 1 $(26,165) $(265) $(26,430)
Losses reclassified from net accumulated other comprehensive loss 303
 2
 305
Net current period other comprehensive income 303
 2
 305
Accumulated other comprehensive loss at June 30 $(25,862) $(263) $(26,125)
  Three Months Ended June 30, 2017
(Thousands of Dollars) Gains and Losses on Cash Flow Hedges Defined Benefit and Postretirement Items Total
Accumulated other comprehensive loss at April 1 $(22,534) $(219) $(22,753)
Losses reclassified from net accumulated other comprehensive loss 250
 1
 251
Net current period other comprehensive income 250
 1
 251
Accumulated other comprehensive loss at June 30 $(22,284) $(218) $(22,502)
  Six Months Ended June 30, 2018
(Thousands of Dollars) Gains and Losses on Cash Flow Hedges Defined Benefit and Postretirement Items Total
Accumulated other comprehensive loss at Jan. 1 $(26,465) $(267) $(26,732)
Losses reclassified from net accumulated other comprehensive loss 603
 4
 607
Net current period other comprehensive income 603
 4
 607
Accumulated other comprehensive loss at June 30 $(25,862) $(263) $(26,125)
  Six Months Ended June 30, 2017
(Thousands of Dollars) Gains and Losses on Cash Flow Hedges Defined Benefit and Postretirement Items Total
Accumulated other comprehensive loss at Jan. 1 $(22,780) $(220) $(23,000)
Losses reclassified from net accumulated other comprehensive loss 496
 2
 498
Net current period other comprehensive income 496
 2
 498
Accumulated other comprehensive loss at June 30 $(22,284) $(218) $(22,502)


Reclassifications from accumulated other comprehensive loss for the three and six months ended June 30, 2018 and 2017 were as follows:
      
  Amounts Reclassified from Accumulated Other
Comprehensive Loss
 
(Thousands of Dollars) Three Months Ended June 30, 2018 Three Months Ended June 30, 2017 
Losses on cash flow hedges:  
   
Interest rate derivatives $402
(a) 
$403
(a) 
Total, pre-tax 402
 403
 
Tax benefit (99) (153) 
Total, net of tax 303
 250
 
Defined benefit pension and postretirement losses:     
Amortization of net loss 2
(b) 
2
(b) 
Total, pre-tax 2
 2
 
Tax benefit 
 (1) 
Total, net of tax 2
 1
 
Total amounts reclassified, net of tax $305
 $251
 
      
  
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars) Six Months Ended June 30, 2018 Six Months Ended June 30, 2017 
Losses on cash flow hedges:     
Interest rate derivatives $800
(a) 
$801
(a) 
Total, pre-tax 800
 801
 
Tax benefit (197) (305) 
Total, net of tax $603
 $496
 
Defined benefit pension and postretirement losses:     
Amortization of net loss $4
(b) 
$4
(b) 
Total, pre-tax 4
 4
 
Tax benefit 
 (2) 
Total, net of tax 4
 2
 
Total amounts reclassified, net of tax $607
 $498
 
  Three Months Ended June 30
(Millions of Dollars) 2019 2018
Regulated Electric    
Operating revenues $692.7
 $716.2
Intersegment revenues 0.1
 0.1
Total revenue 692.8
 716.3
Net income 84.8
 101.9
Regulated Natural Gas    
Operating revenues $207.6
 $186.7
Intersegment revenues 
 0.1
Total revenue 207.6
 186.8
Net income 17.6
 21.0
All Other    
Operating revenues (a)
 $9.7
 $9.0
Net loss (0.9) (0.6)
Consolidated Total    
Operating revenues (a)
 $910.1
 $912.1
Reconciling eliminations (0.1) (0.2)
Total revenue $910.0
 $911.9
Net income 101.5
 122.3
(a) 
Included in interest charges.Operating revenues include $1.1 million of other affiliate revenue for the three months ended June 30, 2019 and 2018.

  Six Months Ended June 30
(Millions of Dollars) 2019 2018
Regulated Electric    
Operating revenues $1,434.2
 $1,414.5
Intersegment revenues 0.2
 0.2
Total revenue 1,434.4
 1,414.7
Net income 167.2
 181.5
Regulated Natural Gas    
Operating revenues $676.7
 $550.6
Intersegment revenues 0.1
 0.1
Total revenue 676.8
 550.7
Net income 76.8
 74.7
All Other    
Operating revenues (a)
 $22.1
 $20.1
Net loss (3.7) (0.2)
Consolidated Total    
Operating revenues (a)
 $2,133.3
 $1,985.5
Reconciling eliminations (0.3) (0.3)
Total revenue $2,133.0
 $1,985.2
Net income 240.3
 256.0

(b)(a) 
Included inOperating revenues include $2.2 million of other affiliate revenue for the computation of net periodic pensionsix months ended June 30, 2019 and postretirement benefit costs. See Note 11 to the consolidated financial statements for details regarding these benefit plans.2018.

13.Revenues

PSCo principally generates revenue from the generation, transmission, distribution and sale of electricity and the transportation, distribution and sale of natural gas to wholesale and retail customers. Performance obligations related to the sale of energy are satisfied as energy is delivered to customers. PSCo recognizes revenue in an amount that corresponds directly to the price of the energy delivered to the customer. The measurement of energy sales to customers is generally based on the reading of their meters, which occurs on a systematic basis throughout the month. At the end of each month, amounts of energy delivered to customers since the date of the last meter reading are estimated, and the corresponding unbilled revenue is recognized. Contract terms are generally short-term in nature, and as such PSCo does not recognize a separate financing component of its collections from customers. PSCo presents its revenues net of any excise or other fiduciary-type taxes or fees.

PSCo has various rate-adjustment mechanisms in place that provide for the recovery of natural gas, electric fuel and purchased energy costs. These cost-adjustment tariffs may increase or decrease the level of revenue collected from customers and are revised periodically for differences between the total amount collected under the clauses and the costs incurred. When applicable, under governing regulatory commission rate orders, fuel cost over-recoveries (the excess of fuel revenue billed to customers over fuel costs incurred) are deferred as regulatory liabilities and under-recoveries (the excess of fuel costs incurred over fuel revenues billed to customers) are deferred as regulatory assets.


Certain rate rider mechanisms qualify as alternative revenue programs under GAAP. These mechanisms arise from costs imposed upon the utility by action of a regulator or legislative body related to an environmental, public safety or other mandate. When certain criteria are met (including collection within 24 months), revenue is recognized equal to the revenue requirement, which may include return on rate base items and incentives. The mechanisms are revised periodically for differences between the total amount collected and the revenue recognized, which may increase or decrease the level of revenue collected from customers. Alternative revenue is recorded on a gross basis and is disclosed separate from revenue from contracts with customers in the period earned.

In the following tables, revenue is classified by the type of goods/services rendered and market/customer type. The tables also reconcile revenue to the reportable segments.
  Three Months Ended June 30, 2018
(Thousands of Dollars) Electric Natural Gas All Other Total
Major revenue types        
Revenue from contracts with customers:        
Residential $222,687
 $104,000
 $2,560
 $329,247
Commercial and industrial (C&I) 383,707
 38,904
 5,326
 427,937
Other 11,455
 
 
 11,455
Total retail 617,849
 142,904
 7,886
 768,639
Wholesale 36,148
 
 
 36,148
Transmission 13,159
 
 
 13,159
Other 14,696
 18,845
 
 33,541
Total revenue from contracts with customers 681,852
 161,749
 7,886
 851,487
Alternative revenue and other 34,343
 24,912
 1,124
 60,379
Total revenues $716,195
 $186,661
 $9,010
 $911,866

  Three Months Ended June 30, 2017
(Thousands of Dollars) Electric Natural Gas All Other Total
Major revenue types        
Revenue from contracts with customers:        
Residential $225,921
 $117,393
 $2,639
 $345,953
C&I 392,280
 45,032
 4,457
 441,769
Other 11,711
 
 
 11,711
Total retail 629,912
 162,425
 7,096
 799,433
Wholesale 41,579
 
 
 41,579
Transmission 13,180
 
 
 13,180
Other 16,837
 20,040
 
 36,877
Total revenue from contracts with customers 701,508
 182,465
 7,096
 891,069
Alternative revenue and other 28,412
 10,312
 1,123
 39,847
Total revenues $729,920
 $192,777
 $8,219
 $930,916
  Six Months Ended June 30, 2018
(Thousands of Dollars) Electric Natural Gas All Other Total
Major revenue types        
Revenue from contracts with customers:        
Residential $450,336
 $331,746
 $5,256
 $787,338
C&I 726,933
 124,932
 12,485
 864,350
Other 23,631
 
 60
 23,691
Total retail 1,200,900
 456,678
 17,801
 1,675,379
Wholesale 84,038
 
 
 84,038
Transmission 25,411
 
 
 25,411
Other 33,527
 43,774
 
 77,301
Total revenue from contracts with customers 1,343,876
 500,452
 17,801
 1,862,129
Alternative revenue and other 70,593
 50,195
 2,247
 123,035
Total revenues $1,414,469
 $550,647
 $20,048
 $1,985,164

  Six Months Ended June 30, 2017
(Thousands of Dollars) Electric Natural Gas All Other Total
Major revenue types        
Revenue from contracts with customers:        
Residential $460,355
 $343,303
 $5,203
 $808,861
C&I 751,977
 131,274
 13,717
 896,968
Other 24,386
 
 63
 24,449
Total retail 1,236,718
 474,577
 18,983
 1,730,278
Wholesale 85,155
 
 
 85,155
Transmission 27,819
 
 
 27,819
Other 33,532
 42,650
 
 76,182
Total revenue from contracts with customers 1,383,224
 517,227
 18,983
 1,919,434
Alternative revenue and other 58,084
 31,686
 2,246
 92,016
Total revenues $1,441,308
 $548,913
 $21,229
 $2,011,450

Item 2 — MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Discussion of financial condition and liquidity for PSCo is omitted per conditions set forth in general instructions H (1) H(1)(a) and (b) of Form 10-Q for wholly owned subsidiaries. It is replaced with management’s narrative analysis of the results of operations set forth in general instructions H (2) H(2)(a) of Form 10-Q for wholly owned subsidiaries (reduced disclosure format).

Financial Review

The following discussion and analysis by management focuses on those factors that had a material effect on PSCo’s financial condition, results of operations and cash flows during the periods presented, or are expected to have a material impact in the future. It should be read in conjunction with the accompanying unaudited consolidated financial statements and related notes to the consolidated financial statements. Due to the seasonality of PSCo’s electric and natural gas sales, such interim results are not necessarily an appropriate base from which to project annual results.


Forward-Looking Statements

Except for the historical statements contained in this report, the matters discussed herein, are forward-looking statements that are subject to certain risks, uncertainties and assumptions. Such forward-looking statements including the TCJA’s impact to PSCo and its customers, as well as assumptions and other statements identified in this document by the words “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “objective,” “outlook,” “plan,” “project,” “possible,” “potential,” “should,” “will,” “would” and similar expressions. Actual results may vary materially. Forward-looking statements speak only as of the date they are made, and we expressly disclaim any obligation to update any forward-looking information. The following factors, in addition to those discussed elsewhere in this Quarterly Report on Form 10-Q and in other securities filings (including PSCo’s Annual Report on Form 10-K for the fiscal year ended Dec. 31, 2017 and subsequent securities filings), could cause actual results to differ materially from management expectations as suggested by such forward-looking information: general economic conditions, including inflation rates, monetary fluctuations and their impact on capital expenditures and the ability of PSCo and its subsidiaries to obtain financing on favorable terms; business conditions in the energy industry; including the risk of a slow down in the U.S. economy or delay in growth, recovery, trade, fiscal, taxation and environmental policies in areas where PSCo has a financial interest; customer business conditions; actions of credit rating agencies; competitive factors including the extent and timing of the entry of additional competition in the markets served by PSCo and its subsidiaries; unusual weather; effects of geopolitical events, including war and acts of terrorism; cyber security threats and data security breaches; state, federal and foreign legislative and regulatory initiatives that affect cost and investment recovery, have an impact on rates or have an impact on asset operation or ownership or impose environmental compliance conditions; structures that affect the speed and degree to which competition enters the electric and natural gas markets; costs and other effects of legal and administrative proceedings, settlements, investigations and claims; financial or regulatory accounting policies imposed by regulatory bodies; outcomes of regulatory proceedings; availability or cost of capital; and employee work force factors.

Non-GAAP Financial Measures

The following discussion includes financial information prepared in accordance with GAAP, as well as certain non-GAAP financial measures such as electric margin, and natural gas margin.margin and ongoing earnings. 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 adjusted from the most directly comparable measuremeasures calculated and presented in accordance with GAAP. PSCo’s management uses non-GAAP measures internally for financial planning and analysis, for reporting of results, to the Board of Directorsin determining performance-based compensation and when communicating its earnings outlook to analysts and investors. Non-GAAP financial measures are intended to supplement investors’ understanding of our operating performance and should not be considered alternatives for financial measures presented in accordance with GAAP. These measures are discussed in more detail below and may not be comparable to other companies’ similarly titled non-GAAP financial measures.

Electric and Natural Gas Margins
Electric margin is presented as electric revenues less electric fuel and purchased power expenses and naturalexpenses. Natural gas margin is presented as natural gas revenues less the cost of natural gas sold and transported. Expenses incurred for electric fuel and purchased power and the cost of natural gas sold and transported are generally recovered through various regulatory recovery mechanisms, and asmechanisms. As a result, changes in these expenses are generally offset in operating revenues.
Management believes electric and natural gas margins provide the most meaningful basis for evaluating our operations because they exclude the revenue impact of fluctuations in these expenses. These margins can be reconciled to operating income, a GAAP measure, by including steam and other operating revenues, cost of sales - steam and other,sales-other, O&M expenses, conservation and demand side management (DSM) expenses, depreciation and amortization and taxes (other than income taxes).

Results of Operations

PSCo’s net income was approximately $256$240.3 million for the second quarter of 2018,2019, compared with approximately $212$256.0 million for the same period of 2017.2018. The increasedecrease in year-to-date earnings was driven by higher electricO&M and natural gas margins due to the impact of an interim rate increase, subject to refund, and favorable weather and increased allowance for funds used during construction (AFUDC) primarily related to the Rush Creek wind project. These items weredepreciation partially offset by the timing of gas rates in 2018 and higher interest charges and depreciation expense.


gas sales.
Electric Revenues and Margin

Electric revenues and fuel and purchased power expenses are impacted by fluctuations in the price of natural gas and coal used in the generation of electricity. However, these price fluctuations have minimal impact on electric margin due to fuel recovery mechanisms that recover fuel expenses. The following table details theIn addition, electric customers receive a credit for PTCs that are generated in a particular period.
Electric revenues and margin:
 Six Months Ended June 30 Six Months Ended June 30
(Millions of Dollars) 2018 2017 2019 2018
Electric revenues before impact of the TCJA $1,460
 $1,441
Electric revenues $1,434.2
 $1,414.5
Electric fuel and purchased power (553) (568) (544.9) (553.1)
Electric margin before impact of the TCJA $907
 $873
Impact of the TCJA (offset as a reduction in income tax expense) (46) 
Electric margin $861
 $873
 $889.3
 $861.4

The following tables summarize the components of the changesChanges in electric revenues and electric margin for the six months ended June 30:

Electric Revenuesmargin:
(Millions of Dollars) 2018 vs. 2017
Fuel and purchased power cost recovery $(8)
Estimated impact of weather 8
DSM program revenues (offset by expenses) 7
Trading 5
DSM incentive 2
Non-fuel riders 2
Firm wholesale 2
Other, net 1
Total increase in electric revenues before impact of the TCJA $19
Impact of the TCJA (offset as a reduction in income tax expense) (46)
Total decrease in electric revenues $(27)

Electric Margin
(Millions of Dollars) 2018 vs. 2017
Estimated impact of weather $8
DSM program revenues (offset by expenses) 7
Trading 3
DSM incentive 2
Fuel handling and procurement 2
Non-fuel riders 2
Firm wholesale 2
Other, net 8
Total increase in electric margin before impact of the TCJA $34
Impact of the TCJA (offset as a reduction in income tax expense) (46)
Total decrease in electric margin $(12)


(Millions of Dollars) Three Months Ended June 30, 2019 vs. 2018
Non-fuel riders $32.5
Finance leases (offset in interest expense and amortization) 10.9
Timing of tax reform regulatory decisions (offset in income tax and amortization) 6.0
Estimated impact of weather (11.0)
Wholesale transmission revenue (net) (2.5)
Other, net (8.0)
Total increase in electric margin $27.9
Natural Gas Revenues and Margin

Total natural gas expense varies with changing sales and the cost of natural gas. However, fluctuations in the cost of natural gas hashave minimal impact on natural gas margin due to natural gas cost recovery mechanisms. The following table details natural
Natural gas revenues and margin:
  Six Months Ended June 30
(Millions of Dollars) 2019 2018
Natural gas revenues $676.7
 $550.6
Cost of natural gas sold and transported (342.4) (249.8)
Natural gas margin $334.3
 $300.8
  Six Months Ended June 30
(Millions of Dollars) 2018 2017
Natural gas revenues before impact of the TCJA $566
 $549
Cost of natural gas sold and transported (250) (267)
Natural gas margin before impact of the TCJA $316
 $282
Impact of the TCJA (offset as a reduction in income tax expense) (15) 
Natural gas margin $301
 $282

The following tables summarize the components of the changes
Changes in natural gas revenues and natural gas margin for the six months ended June 30:

Natural Gas Revenuesmargin:
(Millions of Dollars) 2018 vs. 2017
Retail rate increase (interim, subject to refund) $20
Infrastructure and integrity riders 8
Estimated impact of weather 4
Purchased natural gas adjustment clause recovery (16)
Other, net 1
Total increase in natural gas revenues before impact of the TCJA $17
Impact of the TCJA (offset as a reduction in income tax expense) (15)
Total increase in natural gas revenues $2

Natural Gas Margin
(Millions of Dollars) 2018 vs. 2017 Three Months Ended June 30, 2019 vs. 2018
Retail rate increase (interim, subject to refund) $20
Retail rate increase $11.9
Estimated impact of weather 8.7
Infrastructure and integrity riders 8
 5.2
Estimated impact of weather 4
Transport sales 3.7
Retail sales growth (excluding weather impact) 3.5
Other, net 2
 0.5
Total increase in natural gas margin before impact of the TCJA $34
Impact of the TCJA (offset as a reduction in income tax expense) (15)
Total increase in natural gas margin $19
 $33.5
Non-Fuel Operating Expenses and Other Items
O&M Expenses— O&M expenses increased $27.4 million, or 7.4%, for 2019 year-to-date. Increase was primarily driven by distribution, plant generation and natural gas operations costs. Distribution costs were higher due to storms, meters and vegetation management. Plant generation costs increased due to the Rush Creek wind project being placed in-service and the timing of planned maintenance and overhauls. Natural gas operation expenses increased due to pipeline maintenance.
Depreciation and Amortization Depreciation and amortization expense increased $56.8 million, or 23.8%, for 2019 year-to-date. Increase was primarily driven by the Rush Creek wind project being placed in-service (recovered in riders), additional amortization of a prepaid pension asset in Colorado related to tax reform settlements (offset in income taxes) and other capital investments.
AFUDC, Equity and Debt AFUDC decreased $20.3 million for 2019 year-to-date. Decrease was primarily due to the Rush Creek wind project being placed in-service in 2018.
Interest ChargesInterest charges increased $15.9 million, or 15.7%, for 2019 year-to-date. Increase was related to higher debt levels to fund capital investments, changes in short-term interest rates and implementation of lease accounting standard (offset in electric margin).
Income Taxes — Income tax expense decreased $44.6 million for the second quarter of 2019 compared with 2018. Decrease was primarily driven by wind PTCs, lower pretax earnings and an increase in plant-related regulatory differences. Wind PTCs flow back to customers (recorded as a reduction to revenue) and do not have a material impact on net income. ETR was 11.0% for the first six months of 2019 compared with 22.5% for the same period of 2018, largely due to the adjustments above. See Note 6 to the consolidated financial statements.
Regulation
FERC and State Regulation The FERC has jurisdiction over rates for electric transmission service in interstate commerce and electricity sold at wholesale, hydro facility licensing, natural gas transportation, asset transactions and mergers, accounting practices and certain other activities of PSCo, including enforcement of North American Electric Reliability Corporation mandatory electric reliability standards. State and local agencies have jurisdiction over many of PSCo’s activities, including regulation of retail rates and environmental matters.
Xcel Energy, which includes PSCo, attempts to mitigate the risk of regulatory penalties through formal training on prohibited practices and a compliance function that reviews interaction with the markets under FERC and Commodity Futures Trading Commission jurisdictions. Public campaigns are conducted to raise awareness of the public safety issues of interacting with our electric systems. While programs to comply with regulatory requirements are in place, there is no guarantee the compliance programs or other measures will be sufficient to ensure against violations. Decisions by these regulators can significantly impact PSCo’s results of operations.
Colorado 2019 Electric Rate Case — In May 2019, PSCo filed a request with the CPUC seeking a net rate increase of $158.3 million, or 5.7%. The filing also requests the transfer of $249.4 million of rider revenue to base rates, which will not impact overall customer bills as the revenue is currently being recovered through various riders. The request is based on a ROE of 10.35%, an equity ratio of 56.46%, a historic test year ended Dec. 31, 2018 (adjusted for 2019 capital investment) and incorporates the full impact of tax reform. PSCo has requested rates effective Jan. 1, 2020.
Revenue Request (Millions of Dollars) 2020
Changes since 2014 rate case:  
Plant-related growth 2013-2018 $85.3
O&M savings, sales growth and other cost reductions (89.1)
Forecasted 2019 capital additions 48.9
Advanced Grid Intelligence and Security grid modernization 39.1
Updated cost of capital 31.7
Previously approved depreciation rates 28.1
Incremental wildfire mitigation 14.3
Net increase to revenue 158.3
Previously authorized costs:  
CACJA, TCA and Rush Creek (a)
 249.4
Total base revenue request $407.7
   
Expected year-end rate base (b)
 $8,221.1
(a)
Roll-in of CACJA, TCA and Rush Creek Wind Project (excluding PTCs) amounts into base rates will not impact total revenue as costs are currently recovered from customers through riders or the fuel clause.
(b)
Base rate request does not include the impact of the proposed Colorado Energy Plan.
The procedural schedule is as follows:
Answer testimony — Sept. 6, 2019
Rebuttal testimony — Oct. 8, 2019
Evidentiary hearing — Nov. 4-13, 2019
Statement of position — Nov. 22, 2019

Other Pending and Recently Concluded Regulatory Proceedings
Mechanism Utility Service
Amount Requested
(in millions)
Filing
Date
ApprovalAdditional Information
CPUC
Rate CaseSteam$7
May
2019
PendingIn May 2019, PSCo filed an unopposed Settlement Agreement with CPUC Staff and the City of Denver. The settlement reflects a ROE of 9.67% for AFUDC purposes, an equity ratio of 56.04% and utilization of tax reform benefits. Final rates would be effective in October 2020, with an initial step increase in October 2019. In July 2019, the Administrative Law Judge recommended that the settlement agreement be approved without modification. Settlement is pending a CPUC decision.
Rate Case AppealNatural GasN/AApril 2019PendingIn April 2019, PSCo filed an appeal seeking judicial review of the CPUC’s prior ruling regarding PSCo’s last natural gas rate case (approved in December 2018). Appeal requests review of the following: denial of a return on the prepaid pension and retiree medical assets; the use of a capital structure that is not based on the actual historical test year level; and the use of an average rate base methodology rather than a year-end rate base methodology. The District Court of Denver County has adopted a briefing schedule that will conclude in October 2019. Timeline on a final ruling is unknown at this point.
DSM Program Expenses DSM program expenses increased $8 million, or 13.7 percent, for 2018 year-to-date. The increase was due to higher recovery rates for electric and natural gas sales. DSM expenses are generally recovered concurrently through riders and base rates. Timing of recovery may not correspond to the period in which costs were incurred.

Depreciation and Amortization Depreciation and amortization expense increased $6 million, or 2.4 percent, for 2018 year-to-date. The increase was primarily driven by capital expenditures due to planned system investments.

AFUDC, Equity and Debt AFUDC increased $19 million for 2018 year-to-date.  The increase was primarily due to the Rush Creek wind project.

Interest ChargesInterest charges increased $9 million, or 9.6 percent, for 2018 year-to-date. The increase was primarily due to higher debt levels to fund capital investments, partially offset by refinancings at lower interest rates.


Income Taxes — Income tax expense decreased $47 million for the first six months of 2018 compared with the same period in 2017. The decrease was primarily driven by a lower federal tax rate due to the TCJA. The ETR was 22.5 percent for the first six months of 2018 compared with 36.4 percent for the same period of 2017. The lower ETR in 2018 is primarily due to the lower federal tax rate. See Note 4 to the consolidated financial statements.

Public Utility Regulation

Except to the extent noted below and in Note 5 to the consolidated financial statements,Regulation above, the circumstances set forth in Public Utility Regulation included in Item 1 of PSCo’s Annual Report on Form 10-K for the year ended Dec. 31, 20172018 and Public Utility Regulation included in Item 2 of PSCo’sPSCo's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018,2019, appropriately represent, in all material respects, the current status of public utility regulation and are incorporated herein by reference.

Colorado Energy Plan (CEP) In 2016, PSCo filed its 2016 Electric Resource Plan (ERP) which included the estimated need for additional generation resources through spring of 2024. In 2017, PSCo filed an updated capacity need with the CPUC of 450 MW in 2023.

In 2017, PSCo and various other stakeholders filed a stipulation agreement proposing the CEP, an alternative plan that increases PSCo’s potential capacity need up to 1,110 MW due to the proposed retirement of two coal units.

Environmental Matters
In June 2018, PSCo filed its 120-day update report2019, the EPA issued the final ACE rule to replace the Obama-era Clean Power Plan. The final ACE rule may require implementation of heat rate improvement projects at some of our coal-fired power plants. It is not known what the costs associated with the CPUC which includes multiple portfolios and recommends a preferred CEP portfolio. PSCo's investment underfinal rule might be until state plans are developed to implement the preferred CEP portfoliofinal regulation. PSCo believes, based on prior state commission practice, the cost of these initiatives or replacement generation would be approximately $1 billion, including investment in transmission to support the significant increase in renewable generation in the state. The preferred CEP portfolio includes the following additions as well as the retirement of the two coal-fired generation units:
Total CapacityPSCo's Ownership
Wind generation1,100 MW500 MW
Solar generation700 MW
Battery storage275 MW
Natural gas generation380 MW380 MW

On July 13, 2018, the Independent Evaluator (IE) for the ERP filed their report on the process, modeling and evaluation of the various offers receivedrecoverable through the RFP process.  Generally, the IE report was favorable to the process employed and the outcomes included in the modeling.  Certain recommendations for future ERP processes were provided with a primary focus regarding enhanced modeling of new resource types such as battery storage.
On July 23, 2018, various stakeholders commented on the 120-day update report for the ERP and the CEP. Many community, advocate and developer interests supported the CEP, while certain stakeholders opposed the CEP and the associated early coal plant retirements. The CPUC staff indicated that PSCo’s preferred CEP plan is a valid option, but expressed concerns on the saving assumptions, complexity of modeling and the utilization of production tax credits.

A CPUC decision is anticipated in September 2018.

Public Utility Regulatory Policies Act (PURPA) Enforcement Complaint against CPUC — Sustainable Power Group, LLC (sPower) has proposed to construct over 1,500 MW of solar and wind generation in Colorado and is seeking to require PSCo to contract for these resources under PURPA. In March 2017, sPower filed a complaint for declaratory and injunctive relief in the United States District Court for the District of Colorado (District Court) requesting that the court find a December 2016 CPUC ruling that a qualifying facility must be a successful bidder in a PSCo resource acquisition bidding process violated PURPA and FERC rules. In June 2018, the court denied a motion by the CPUC to dismiss. The case remains pending further action from the court.


Open Access Transmission Tariff (OATT) Reform — In May 2018, the FERC denied a request by PSCo to amend its OATT to allow large generating interconnection agreements to be suspended by the generator only due to a force majeure event, rather than allowing suspension for up to 36 months for any reason.  PSCo requested the changes to facilitate more efficient processing of generator interconnection requests.  PSCo has initiated a process to achieve broader generator interconnection queue reform and anticipates requesting additional OATT changes later in 2018.  In April, 2018, the FERC had issued a final rule requiring generator interconnection OATT queue reforms in addition (but generally complimentary) to reforms PSCo already requested. PSCo currently has more than 22,000 MW of new generator projects in its interconnection queue.  The broader interconnection queue reforms are intended to allow generators to proceed to interconnection on a “first ready, first served” basis, similar to the processes already use in MISO.

Boulder, Colorado Municipalization — In 2011, City of Boulder, Colorado (Boulder) voters passed a ballot measure authorizing the formation of an electric municipal utility, subject to certain conditions. Since that time, there have been various legal proceedings in multiple venues with jurisdiction over Boulder’s plan. In 2014, the Boulder City Council passed an ordinance to establish an electric utility. PSCo challenged the formation of this utility as premature and the Colorado Court of Appeals ruled in PSCo’s favor, vacating a lower court decision. In June 2018, the Colorado Supreme Court rejected Boulder’s request to dismiss the case and ruled that the case be remanded for hearing at the Boulder District Court (District Court).

Boulder has filed multiple separation applications with the CPUC, which have been challenged by PSCo and other intervenors. In September 2017, the CPUC issued a written decision, agreeing with several key aspects of PSCo’s position. The CPUC approved the designation of some electrical distribution assets for transfer, subject to Boulder completing certain filings. In July 2018, the CPUC approved Boulder and PSCo’s joint request to extend the time by which these filings would be due until Aug. 24, 2018. Boulder does not have authorization from the CPUC to initiate a condemnation proceeding at this time.

Summary of Recent Federal Regulatory Developments

FERC

The FERC has jurisdiction over rates for electric transmission service in interstate commerce and electricity sold at wholesale, hydro facility licensing, natural gas transportation, asset transactions and mergers, accounting practices and certain other activities of PSCo, including enforcement of North American Electric Reliability Corporation mandatory electric reliability standards. State and local agencies have jurisdiction over many of PSCo’s activities, including regulation of retail rates and environmental matters. See additional discussion in the summary of recent federal regulatory developments and public utility regulation sections of the PSCo Annual Report on Form 10-K for the year ended Dec. 31, 2017 and Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018. In addition to the matters discussed below, see Note 5 to the consolidated financial statements for a discussion of other regulatory matters.

Xcel Energy, which includes PSCo, attempts to mitigate the risk of regulatory penalties through formal training on prohibited practices and a compliance function that reviews interaction with the markets under FERC and Commodity Futures Trading Commission jurisdictions. Public campaigns are conducted to raise awareness of the public safety issues of interacting with our electric systems. While programs to comply with regulatory requirements are in place, there is no guarantee the compliance programs or other measures will be sufficient to ensure against violations.

rates.
Item 4 — CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

PSCo maintains a set of disclosure controls and procedures designed to ensure that information required to be disclosed in reports that it files or submits under the Securities Exchange Act of 1934 is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms. In addition, the disclosure controls and procedures ensure that information required to be disclosed is accumulated and communicated to management, including the chief executive officer (CEO) and chief financial officer (CFO), allowing timely decisions regarding required disclosure. As of June 30, 2018,2019, based on an evaluation carried out under the supervision and with the participation of PSCo’s management, including the CEO and CFO, of the effectiveness of its disclosure controls and the procedures, the CEO and CFO have concluded that PSCo’s disclosure controls and procedures were effective.

Internal Control Over Financial Reporting

No changes in PSCo’s internal control over financial reporting occurred during the most recent fiscal quarter that materially affected, or are reasonably likely to materially affect, PSCo’s internal control over financial reporting.

Part II — OTHER INFORMATION

Item 1LEGAL PROCEEDINGSLegal Proceedings

PSCoPSCO is involved in various litigation matters that are being defended and handled in the ordinary course of business. The assessmentAssessment of whether a loss is probable or is a reasonable possibility, and whether thea loss or a range of loss is estimable, often involves a series of complex judgments aboutregarding future events. Management maintains accruals for such losses that are probable of being incurred and subject to reasonable estimation. Management is sometimesmay be unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss.

Additional Information

See Note 69 to the consolidated financial statements for further discussion of legal claims and environmental proceedings. See Part I Item 2 and Note 5 to the consolidated financial statements for a discussion of proceedings involving utility rates and other regulatory matters.

further information.
Item 1A — RISK FACTORS

PSCo’s risk factors are documented in Item 1A of Part I of its Annual Report on Form 10-K for the year ended Dec. 31, 2017,2018, which is incorporated herein by reference. There have been no material changes from the risk factors previously disclosed in the Form 10-K.10-K.

Item 6 EXHIBITS
*Indicates incorporation by reference
* Indicates incorporation by reference
+ Executive Compensation Arrangements and Benefit Plans Covering Executive Officers and Directors
Exhibit NumberDescriptionReport or Registration StatementSEC File or Registration NumberExhibit Reference
PSCo Form 10-Q for the quarter ended Sept. 30, 2017 (file no. 001-03280)).001-032803.01
PSCo Form 10-Q/A10-K for the quarteryear ended Sept. 30, 2013 (file no. 001-03280)).Dec. 31, 2018001-032803.02
Xcel Energy Inc. Form 8-K fileddated June 21, 2018 (file no. 001-03280)).7, 2019
001-03034


99.03

101The following materials from PSCo’s Quarterly Report on Form 10-Q for the quarter ended June 30, 20182019 are formatted in XBRL (eXtensible Business Reporting Language):  (i) the Consolidated Statements of Income, (ii) the Consolidated Statements of Comprehensive Income (iii) the Consolidated Statements of Cash Flows, (iv) the Consolidated Balance Sheets, (v) Notes to Consolidated Financial Statements, and (vi) document and entity information.



SIGNATURES


Pursuant to the requirements 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.


  Public Service Company of Colorado
   
July 27, 2018Aug. 1, 2019By:/s/ JEFFREY S. SAVAGE
  Jeffrey S. Savage
  Senior Vice President, Controller
  (Principal Accounting Officer)
   
  /s/ ROBERT C. FRENZEL
  Robert C. Frenzel
  Executive Vice President, Chief Financial Officer and Director
  (Principal Financial Officer)




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