SCHEDULE 14A INFORMATION
 
                  Proxy Statement Pursuant to Section 14(a) of
            the Securities Exchange Act of 1934 (Amendment No.    )
 
    Filed by the Registrant /X/
    Filed by a party other than the Registrant / /
 
    Check the appropriate box:
    / /  Preliminary Proxy Statement
    / /  Confidential, for Use of the Commission Only (as permitted by Rule
         14a-6(e)(2))
    /X/  Definitive Proxy Statement
    / /  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 
         240.14a-12
 
                          Black Hills Corporation
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)
 
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  No fee required

/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) 
     and 0-11

    (1) Title of each class of securities to which transaction applies:

        ------------------------------------------------------------------------
    (2) Aggregate number of securities to which transaction applies:

        ------------------------------------------------------------------------
    (3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
        filing fee is calculated and state how it was determined):

        ------------------------------------------------------------------------
    (4) Proposed maximum aggregate value of transaction:

        ------------------------------------------------------------------------
    (5) Total fee paid:

        ------------------------------------------------------------------------

/ / Fee paid previously with preliminary materials.

/ / Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.

    (1) Amount Previously Paid:

        ------------------------------------------------------------------------
    (2) Form, Schedule or Registration Statement No.:

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    (3) Filing Party:

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    (4) Date Filed:

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                                     [LOGO]
 
                                625 NINTH STREET
                         RAPID CITY, SOUTH DAKOTA 57701
 
                            ------------------------
 
                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
                            TO BE HELD MAY 19, 1998
 
                             ---------------------
 
To the Shareholders of
 Black Hills Corporation:
 
    NOTICE IS HEREBY GIVEN that the Annual Meeting of the holders of Common
Stock of BLACK HILLS CORPORATION (herein called the Company) will be held at the
Radisson Hotel, 445 Mt. Rushmore Road, Rapid City, South Dakota, on Tuesday, May
19, 1998, commencing at 9:30 A.M., for the following purposes:
 
    1.  To elect three Class III Directors to serve until the Annual Meeting of
       Shareholders in 2001;
 
    2.  To ratify the appointment of Arthur Andersen LLP to serve as independent
       auditors of the Company for the year 1998; and
 
    3.  To transact such other business as may properly come before the meeting
       or any adjournment thereof.
 
    Only shareholders of record at the close of business on March 20, 1998, are
entitled to notice of and to vote at the meeting or any adjournment thereof.
 
    All shareholders are cordially invited to attend the meeting. Please
complete, date, sign, and return the accompanying form of proxy. A return
envelope is enclosed which requires no postage if mailed in the United States.
We appreciate your giving this matter your prompt attention.
 
                                          By Order of the Board of Directors
                                          ROXANN R. BASHAM
                                          VICE PRESIDENT -- FINANCE
                                          AND CORPORATE SECRETARY/TREASURER
 
Dated:  March 30, 1998
 
                                       1

                                     [LOGO]
 
                                625 NINTH STREET
                         RAPID CITY, SOUTH DAKOTA 57701
 
                            ------------------------
 
                                PROXY STATEMENT
 
                             ---------------------
 
    A proxy in the accompanying form is solicited by the Board of Directors of
Black Hills Corporation, a South Dakota corporation (the Company), to be voted
at the Annual Meeting of Shareholders of the Company to be held Tuesday, May 19,
1998, and at any adjournment thereof.
 
    The enclosed form of proxy, when executed and returned, will be voted as set
forth therein. Any shareholder signing a proxy has the power to revoke the same
in writing, addressed to the Secretary of the Company, or in person at the
meeting at any time before the proxy is exercised.
 
    All shares represented by valid, unrevoked proxies will be voted at the
Annual Meeting. Shares voted as abstentions on any matter (or as "withhold
authority" as to Directors) will be counted as shares that are present and
entitled to vote for purposes of determining the presence of a quorum at the
meeting and as unvoted, although present and entitled to vote, for purposes of
determining the approval of each matter as to which the shareholder has
abstained. If a broker submits a proxy which indicates that the broker does not
have discretionary authority as to certain shares to vote on one or more
matters, those shares will be counted as shares that are present and entitled to
vote for purposes of determining the presence of a quorum at the meeting, but
will not be considered as present and entitled to vote with respect to such
matters.
 
    The Company will bear all costs of the solicitation. In addition to
solicitation by mail, officers and employees of the Company may solicit proxies
by telephone, telegraph, or in person. Kissel-Blake Inc. has been retained by
the Company to assist in the solicitation of proxies at an anticipated cost of
$2,500 plus out-of-pocket expenses. Also, the Company will, upon request,
reimburse brokers or other persons holding stock in their names or in the names
of their nominees for reasonable expenses in forwarding proxies and proxy
material to the beneficial owners of stock.
 
    This Proxy Statement and the accompanying form of proxy are to be first
mailed on March 30, 1998. The Company's Annual Report to Shareholders and Form
10-K for the year 1997 is being mailed to shareholders with this proxy
statement.
 
                      VOTING RIGHTS AND PRINCIPAL HOLDERS
 
    Only shareholders of record at the close of business on March 20, 1998, will
be entitled to vote at the meeting. The outstanding voting stock of the Company
as of such record date consisted of 21,711,598 shares of Common Stock.
 
    Each outstanding share of Common Stock is entitled to one vote. Cumulative
voting is permitted in the election of directors. Each share is entitled to
three votes, one each for the election of three directors, and the three votes
may be cast for a single person or may be distributed among two or three
persons.
 
    The Company is not aware of any person or group who is the beneficial owner
of more than five percent of the Company's Common Stock.
 
                                       2

                                     ITEM I
                             ELECTION OF DIRECTORS
 
    In accordance with the Bylaws and Article Fifth of the Restated Articles of
Incorporation, the Company's directors are elected to three classes of staggered
terms consisting of three years each. At this Annual Meeting of Shareholders,
three directors will be elected to Class III of the Board of Directors to hold
office for a term of three years until the Annual Meeting of Shareholders in
2001 and until their respective successors shall be duly elected and qualified.
 
    Each of the nominees for director is presently a member of the Board of
Directors of the Company. The proxy attorneys will vote your stock for the
election of the three nominees for director listed below, unless otherwise
instructed. If, at the time of the meeting, any of such nominees shall be unable
to serve in the capacity for which they are nominated or for good cause will not
serve, an event which the Board of Directors does not anticipate, it is the
intention of the persons designated as Proxy Attorneys to vote, at their
discretion, for nominees to replace those who are unable to serve. The
affirmative vote of a majority of the common shares present and entitled to vote
with respect to the election of directors is required for the election of the
nominees to the Board of Directors.
 
    The following information, including principal occupation or employment for
the past five or more years, is furnished with respect to each of the following
persons who are nominated as Class III directors, each to serve for a term of
three years to expire in 2001.
 
    THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR THE ELECTION OF THE FOLLOWING
NOMINEES:
 


           DIRECTORS WHOSE TERMS EXPIRE AT 2001 ANNUAL MEETING -- CLASS III
 
                    NAME, AGE, PRINCIPAL OCCUPATION FOR                       DIRECTOR
                  LAST FIVE YEARS AND OTHER DIRECTORSHIPS                       SINCE
- ----------------------------------------------------------------------------  ---------
                                                                           
ADIL M. AMEER, 45                                                               1997
 President and Chief Executive Officer, Rapid City Regional Hospital,
 Rapid City, South Dakota
EVERETT E. HOYT, 58                                                             1991
 President and Chief Operating Officer of Black Hills Power and Light
 Company
THOMAS J. ZELLER, 50                                                            1997
 President, RE/SPEC Inc. (a consulting and engineering firm) since December
 1994; Vice President -- Finance and Treasurer, RE/SPEC Inc.
 1982 to 1994

 


            DIRECTORS WHOSE TERMS EXPIRE AT 1999 ANNUAL MEETING -- CLASS I
 
                    NAME, AGE, PRINCIPAL OCCUPATION FOR                       DIRECTOR
                  LAST FIVE YEARS AND OTHER DIRECTORSHIPS                       SINCE
- ----------------------------------------------------------------------------  ---------
                                                                           
GLENN C. BARBER, 64                                                             1984
 President and Chief Executive Officer, Glenn C. Barber & Associates
 Inc. (a general construction company)
 
BRUCE B. BRUNDAGE, 62                                                           1986
 President and Director, Brundage & Company (a firm specializing in
 corporate financing), Englewood, Colorado; Director, Vicorp Restaurants,
 Inc.,
 Denver, Colorado
 
KAY S. JORGENSEN, 47                                                            1992
 South Dakota Legislative Representative, Lawrence County, South
 Dakota; Owner, Jorgensen-Thompson Creative Broadcast Services, Spearfish,
 South Dakota

 
                                       3

 


              NOMINEES FOR ELECTION UNTIL 2000 ANNUAL MEETING -- CLASS II
 
                    NAME, AGE, PRINCIPAL OCCUPATION FOR                       DIRECTOR
                  LAST FIVE YEARS AND OTHER DIRECTORSHIPS                       SINCE
- ----------------------------------------------------------------------------  ---------
                                                                           
DANIEL P. LANDGUTH, 51                                                          1989
 Chairman, President, and Chief Executive Officer of the Company;
 Director, Rapid City Regional Hospital, Rapid City, South Dakota
 
JOHN R. HOWARD, 57                                                              1977
 President, Industrial Products, Inc. (an industrial parts distributor)
 
VACANT POSITION

 
SECURITY OWNERSHIP OF MANAGEMENT
 
    As of March 10, 1998, the following table sets forth the beneficial
ownership of Common Stock of the Company for each Director, each executive
officer named in the Summary Compensation table herein, and all Directors and
executive officers of the Company as a group.
 


                                                       NUMBER OF SHARES
                                                        AND NATURE OF
                                                     BENEFICIAL OWNERSHIP
NAME OF BENEFICIAL OWNER                                     (1)
- --------------------------------------------------  ----------------------
                                                 
Adil M. Ameer.....................................              697(2)(3)
Glenn C. Barber...................................           11,914(3)
Bruce B. Brundage.................................           10,439(3)(4)
Dale E. Clement...................................           20,464
Gary R. Fish......................................            8,346(5)(6)
John R. Howard....................................           20,787(3)
Everett E. Hoyt...................................           11,584(5)
Kay S. Jorgensen..................................            2,796(3)
Daniel P. Landguth................................           21,451(5)
Thomas M. Ohlmacher...............................            5,345(5)
Thomas J. Zeller..................................              772(3)(7)
All Directors and executive officers as a group...          134,378(5)

 
- ------------------------
 
(1) Represents outstanding Common Stock beneficially owned both directly and
    indirectly as of March 10, 1998. The Common Stock interest of each named
    person and all Directors and executive officers as a group represents less
    than one percent of the aggregate amount of Common Stock issued and
    outstanding. Except as indicated by footnote below, the beneficial owner
    possesses sole voting and investment powers with respect to the shares
    shown.
 
(2) Includes 150 shares owned jointly with Mr. Ameer's spouse as to which he
    shares voting and investment authority.
 
(3) Includes Common Stock allocated to the Directors' accounts in the Directors'
    Stock Based Compensation Plan of which the Trustee has sole voting and
    investment authority as follows: Mr. Ameer 211 shares, Mr. Barber 5,017
    shares, Mr. Brundage 5,017 shares, Mr. Howard 3,923 shares, Ms. Jorgensen
    1,182 shares, and Mr. Zeller 211 shares.
 
(4) Includes 5,400 shares owned by Brundage & Co. Pension Plan and Trust of
    which Mr. Brundage is the Trustee with sole voting and investment authority.
 
(5) Includes Common Stock held by the Trustee of the Company's Retirement
    Savings Plan (401K) of which the Trustee has sole voting and investment
    authority as follows: Mr. Fish 1,436 shares,
 
                                       4

    Mr. Hoyt 6,937 shares, Mr. Landguth 5,050 shares, Mr. Ohlmacher 1,338 shares
    and all Directors and executive officers as a group 19,846 shares.
 
(6) Includes 3,310 shares owned jointly with Mr. Fish's spouse to which he
    shares voting and investment authority.
 
(7) Includes 225 shares owned jointly with Mr. Zeller's spouse as to which he
    shares voting and investment authority.
 
    Based solely upon a review of Company records and copies of reports on Form
3, 4 and 5 furnished to the Company, the Company believes that during 1997 all
persons subject to the reporting requirements of Section 16(a) of the Securities
Exchange Act of 1934, as amended, filed the required reports on a timely basis.
 
THE BOARD AND COMMITTEES
 
    The Executive Committee is comprised of Adil M. Ameer, Glenn C. Barber, John
R. Howard, Daniel P. Landguth, and Thomas J. Zeller with Mr. Landguth serving as
Chairperson. The Committee exercises the authority of the Board of Directors in
the interval between meetings of the Board, recommends to the Board of Directors
persons to be elected as officers, and recommends persons to be appointed to
Board Committees. The Executive Committee held three meetings during 1997.
 
    The Compensation Committee is comprised of Adil M. Ameer, Glenn C. Barber,
Bruce B. Brundage, John R. Howard, Kay S. Jorgensen, and Thomas J. Zeller with
Ms. Jorgensen serving as Chairperson. The Committee performs functions required
by the Board of Directors in the administration of all federal and state
statutes relating to employment and compensation, recommends to the Board of
Directors compensation for officers, and considers and approves the Company's
compensation program including benefits, stock option plans and stock ownership
plans. The Compensation Committee held four meetings in 1997.
 
    The Audit Committee is comprised of Glenn C. Barber, Bruce B. Brundage, Kay
S. Jorgensen, and Thomas J. Zeller, with Mr. Barber serving as Chairperson. The
Committee annually recommends to the Board of Directors an independent
accounting firm to be appointed by the Board for ratification by the
shareholders, reviews the scope and results of the annual audit including
reports and recommendations of the firm, reviews the Company's internal audit
function, and periodically confers with the internal audit group, management of
the Company, and its independent accountants. The Audit Committee held two
meetings in 1997.
 
    The Nominating Committee is comprised of Adil M. Ameer, Bruce B. Brundage,
John R. Howard, Kay S. Jorgensen, and Daniel P. Landguth, with Mr. Howard
serving as Chairperson. The Committee recommends to the Board of Directors
persons to be nominated as directors or to be elected to fill vacancies on the
Board. The Bylaws require that an outside director serve as Chairperson of the
Committee. The Nominating Committee held one meeting in 1997.
 
    Pursuant to the Company's Bylaws, nominations from shareholders for Board
membership will be considered by the Nominating Committee. Shareholders who wish
to submit names for future consideration for Board membership should do so in
writing prior to November 30, 1998, addressed to Nominating Committee, c/o
Corporate Secretary, Black Hills Corporation, P.O. Box 1400, Rapid City, South
Dakota 57709.
 
    Members of the Committees referred to herein are designated by the Board of
Directors upon recommendation of the Executive Committee each year at a meeting
held following the Annual Meeting of Shareholders.
 
                                       5

    The Board of Directors held nine meetings during 1997. Each director
attended no less than 75 percent of the aggregate of the total number of Board
meetings and Committee meetings on which the director served.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    The Compensation Committee is solely comprised of the following outside
directors, Adil M. Ameer, Glenn C. Barber, Bruce B. Brundage, John R. Howard,
Kay S. Jorgensen, and Thomas J. Zeller.
 
    Mr. Ameer is a director of Black Hills Corporation and serves as a member of
its Compensation Committee. Mr. Landguth, Chairman, President and Chief
Executive Officer of the Company, is also a director of Rapid City Regional
Hospital, a non-profit organization of which Mr. Ameer is President and Chief
Executive Officer. Mr. Landguth is serving a six year term on the Rapid City
Regional Hospital Board of which two years are remaining. Mr. Ameer and Mr.
Landguth do not participate in any compensation decisions involving each other.
 
DIRECTORS' FEES
 
    Directors who are not officers of the Company receive an annual fee of
$12,000 plus a fee of $600 for each board meeting and committee meeting attended
providing such committee meetings are substantive in nature and content.
 
    In addition, each Outside Director receives Common Stock Equivalents equal
to $3,500 per year divided by the market price of the Company's Common Stock.
The Common Stock Equivalents are payable in stock or cash at retirement or can
be deferred at the election of the Director.
 
    During 1997, the Company terminated the Directors' Retirement Plan and
converted the Outside Directors' vested benefits into Company Common Stock
Equivalents.
 
    The Board of Directors are required to beneficially own 100 shares of Common
Stock when they are initially elected a Director and to apply at least 50
percent of his or her retainer toward the purchase of additional shares until
the Director has accumulated at least 2,000 shares of Common Stock.
 
EXECUTIVE COMPENSATION
 
    COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION
 
    The Compensation Committee of the Board of Directors is responsible for
developing and making recommendations to the Board on executive compensation.
The components of the Company's executive compensation program consists of a
base salary, short-term incentive compensation comprised of two components (an
incentive gainsharing bonus and results compensation) and long-term incentive
compensation in the form of stock options. The mix of base salary, incentive
gainsharing bonus, results compensation, and stock options reflects the
Company's goals of attracting and retaining highly qualified and motivated
managers, recognizing and rewarding outstanding performance, fostering a
cohesive management team, and having a portion of compensation contingent upon
the performance of the Company and linked to the mutual interest of the
Company's shareholders.
 
    The Committee makes annual recommendations to the Board concerning the base
salary, incentive gainsharing bonus, and results compensation for the Chief
Executive Officer and each of the other executive officers of the Company.
Recognizing a market based compensation structure, the Committee strives to
ensure that competitive salary ranges and base salaries are being maintained.
The Committee also grants stock options to key employees and determines the
amount, terms and conditions of each of the awards.
 
                                       6

    The Committee retains the services of the internationally known firm, Hewitt
Associates, to review and evaluate the Company's compensation program as
compared with companies within its own industry including data from the Edison
Electric Institute, the trade association of investor-owned electric utilities,
and with companies of comparable size and capitalization.
 
    The Company's position is to establish a market salary level for each salary
range that is at or near the median (50th percentile) of the range of salaries
of comparable companies surveyed. A performance matrix system is used in
determining the percentage of salary increase taking into account the
performance rating for the individual officer and the relationship of the
officer's current salary to market. An outstanding performance rating is given
when there is extraordinary and exceptional accomplishment, results are far in
excess of requirements, and demanding objectives are attained. A superior
performance rating indicates results are well above the expected level and the
individual was successful in accomplishing challenging objectives. Competent
performance ratings are given when all position requirements are met, the
individual consistently performs the job in a satisfactory manner, and realistic
objectives are obtained.
 
    In April 1997, the Compensation Committee granted the Chief Executive
Officer a superior rating for meeting the goals and objectives of the strategic
plan which include a target return on equity, earnings growth and common stock
performance. Consolidated earnings per share increased 18 percent in 1996 from
$1.40 compared to $1.19 in 1995. The Company's 1996 consolidated return on
equity was 15.7 percent, dividends increased 3 percent and total shareholder
return was 19.8 percent. The Compensation Committee approved a 9.6 percent base
salary increase in the amount of $20,451 for the Chief Executive Officer. The
increase to the base salary brought the Chief Executive Officer's base salary to
market as determined by wage surveys.
 
    The Company currently maintains a variety of employee benefit plans and
programs in which its executive officers may participate, including the
gainsharing program, the results compensation program, the retirement savings
(401k) plan, the pension plan, and the Pension Equalization Plan. With the
exception of the Pension Equalization Plan (PEP), these benefit plans and
programs are generally available to all employees within the Company.
 
    The Executive Gainsharing Program is one of three sections of a Company wide
gainsharing program. The goals of the Executive Gainsharing Program support the
interests of the customer and shareholder. This is accomplished through
increased cost containment and operating efficiencies which in the end result in
reduced costs and increased earnings. The program for 1997 consisted of a safety
goal, a reduction in budgeted operating expenses, and an individual performance
related goal. In 1997 all three goals were met resulting in a 3 percent
gainshare award in 1998 based on 1997's program.
 
    The Results Compensation Program was designed to recognize and reward the
contribution that group performance makes to corporate success. All regular
full-time and regular part-time employees are eligible to participate in the
program. Employees represented by Local 1250, IBEW elected not to participate in
the Results Compensation Program. The program has a corporate goal that is based
upon the percentage of consolidated earnings per share which exceeds targeted
amounts. The maximum bonus which can be paid is 8 percent. The maximum bonus was
earned in 1997 and paid in 1998.
 
    It is the objective of the Company to pay its executives a fair salary,
based on the comparable pay of similar types of companies in relation to
achieving corporate, business unit, and individual performance objectives.
 
                             COMPENSATION COMMITTEE
 
Kay S. Jorgensen, Chairperson          Adil M. Ameer           Glenn C. Barber
Bruce B. Brundage                      John R. Howard          Thomas J. Zeller
 
                                       7

    The following table is furnished for the fiscal year ended December 31,
1997, with respect to the Chief Executive Officer of the Company and the four
other most highly compensated executive officers for 1997.
 
                           SUMMARY COMPENSATION TABLE
 


                                                                                              LONG-TERM COMPENSATION
                                                                       ANNUAL COMPENSATION    ----------------------
                                                                      ----------------------  SECURITIES UNDERLYING
NAME AND PRINCIPAL POSITION                                  YEAR       SALARY     BONUS (1)    OPTIONS GRANTED(2)
- ---------------------------------------------------------  ---------  -----------  ---------  ----------------------
                                                                                  
Daniel P. Landguth ......................................       1997  $   222,675  $  26,399            18,000
  Chairman, President, and Chief Executive Officer of the       1996      208,127     17,320            21,600
  Company and subsidiaries                                      1995      197,516      6,397            --
Everett E. Hoyt .........................................       1997  $   147,600  $  15,930             7,500
  President and Chief Operating Officer of Black Hills          1996      137,540     11,705             9,000
  Power and Light Company                                       1995      132,845      6,962            --
Dale E. Clement (3) .....................................       1997  $   137,818  $  16,384            --
  Senior Vice President -- Finance of the Company and           1996      133,164     11,124             9,000
  subsidiaries                                                  1995      129,910      4,173            --
Gary R. Fish ............................................       1997  $   105,012  $  12,349            10,500
  Vice President -- Development of the Company and              1996       86,871      7,253             9,000
  subsidiaries                                                  1995       83,405      2,676            --
Thomas M. Ohlmacher .....................................       1997  $   101,452  $  11,997             7,500
  Vice President -- Power Supply of the Company and             1996       89,561      7,614             9,000
  WYGEN, Inc. (a subsidiary)                                    1995       84,927      4,438            --

 
- ------------------------
 
(1) Bonus amounts include amounts earned under the Results Compensation Program
    and the Executive Gainshare Program, cash bonus programs for Company
    employees based on the attainment of predetermined profitability measures.
 
(2) Reflect the 3-for-2 stock split on March 10, 1998.
 
(3) Mr. Clement retired December 31, 1997.
 
            BLACK HILLS CORPORATION STOCK OPTION GRANTS IN 1997 (1)
 


                                                       NUMBER OF
                                                      SECURITIES     PERCENT OF                              GRANT
                                                      UNDERLYING    TOTAL OPTIONS                            DATE
                                                        OPTIONS      GRANTED TO     EXERCISE   EXPIRATION   PRESENT
NAME                                                    GRANTED       EMPLOYEES       PRICE      PRICE     VALUE (2)
- ----------------------------------------------------  -----------  ---------------  ---------  ----------  ---------
                                                                                            
Daniel P. Landguth..................................      18,000           16.2%    $   19.37    07/21/07  $  28,560
Everett E. Hoyt.....................................       7,500            6.7%    $   19.37    07/21/07  $  11,900
Gary R. Fish........................................      10,500            9.5%    $   19.37    07/21/07  $  16,660
Thomas M. Ohlmacher.................................       7,500            6.7%    $   19.37    07/21/07  $  11,900

 
- ------------------------
 
(1) Options vest annually in installments of 33 percent per year beginning on
    the first anniversary of the date of grant. All options become fully vested
    if a change in control occurs. The exercise price and the number of options
    have been adjusted to reflect the 3-for-2 stock split on March 10, 1998.
 
(2) The Black-Scholes option pricing model was used in determining the present
    value of the options granted. The assumptions utilized in the Black-Scholes
    model are as follows: 15.72 percent for expected volatility; 6.27 percent
    for risk free rate of return; 4.9 percent for dividend yield and 10 years
    for the time of exercise.
 
                                       8

           STOCK OPTION EXERCISES IN 1997 AND YEAR-END OPTION VALUES
 


                                   NUMBER OF SECURITIES            VALUE OF UNEXERCISED
                               UNDERLYING UNEXERCISED OPTION           IN-THE-MONEY
                                        AT 12/31/97                 OPTIONS AT 12/31/97
NAME                           EXERCISABLE/UNEXERCISABLE (1)   EXERCISABLE/UNEXERCISABLE (2)
- -----------------------------  -----------------------------  -------------------------------
                                                        
Daniel P. Landguth...........         7,200/32,400                       $49,200/$133,650
Everett E. Hoyt..............         3,000/13,500                       $20,500/$55,687
Dale E. Clement..............         3,000/-0-                          $20,500/-0-
Gary R. Fish.................         3,000/16,500                       $20,500/$68,062
Thomas M. Ohlmacher..........         3,000/13,500                       $20,500/$55,687

 
- ------------------------
 
(1) The number of options have been adjusted to reflect the 3-for-2 stock split
    on March 10, 1998.
 
(2) Value of unexercisable options is the market value of the shares at year end
    minus the exercise price.
 
RETIREMENT PLANS
 
    The Company has a defined benefit retirement plan (Pension Plan) for its
employees. The Pension Plan provides benefits at retirement based on length of
employment service and average monthly pay in the five consecutive calendar
years of highest earnings out of the last ten years. Employees do not contribute
to the Pension Plan. The amount of annual contribution by the employers to the
Pension Plan is based on an actuarial determination. Accrued benefits become 100
percent vested after an employee completes five years of service.
 
    The Company also has a Pension Equalization Plan (the PEP), a nonqualified
(benefits are not tax deductible until paid) supplemental plan, which is
designed to provide the higher paid executive employee a retirement benefit
which, when added to social security benefits and the pension to be received
from the Pension Plan, will approximate retirement benefits being paid by other
employers to its employees with like executive positions. The employee's pension
from the qualified pension plan is limited under the current law to not exceed
$130,000 annually and the compensation taken into account in determining
contributions and benefits cannot exceed $160,000. The amounts of deferred
compensation paid under nonqualified plans such as the PEP are not subject to
the limits. A participant under the PEP does not qualify for benefits until the
benefits become vested under a vesting schedule--20 percent after three years of
employment under the plan increasing up to 100 percent vesting after eight years
of employment under the plan. No credit for past service is granted under the
PEP. The annual benefit is 25 percent of the employee's average earnings (if
salary was less than two times the Social Security Wage Base) or 30 percent (if
salary was more than two times the Social Security Wage Base) times the vesting
percentage. Average earnings are normally an employee's average earnings for the
five highest consecutive full years of employment during the ten full years of
employment immediately preceding the year of calculation. The annual PEP benefit
is paid on a monthly basis for 15 years to each participating employee and if
deceased to the employee's designated beneficiary or estate, commencing at the
earliest of death or when the employee is both retired and 62 years of age or
more.
 
    In the event that at the time of a Participant's retirement from the Company
the Participant's salary level exceeds the qualified pension plan annual
compensation limitation of $160,000, then the Participant shall receive an
additional benefit which is measured by the difference between the monthly
benefit which would have been provided to the participant under the Company's
Pension Plan as if there were no annual compensation limitation and the monthly
benefit to be provided to the Participant under the Pension Plan.
 
    Participants in the PEP are designated by the Board of Directors upon
recommendation of the Chief Executive Officer. Selection is based on key
employees as determined by management and
 
                                       9

consideration of performance rather than salary based only. The minimum salary
component applied in the selection process is the maximum annual Social Security
taxable wage base which is presently at $68,400.
 
RETIREMENT BENEFITS
 
    The following table illustrates estimated annual benefits payable under the
Pension Plan and the PEP to employees who retire at the normal retirement date.
 


                                                       YEARS OF SERVICE
                                     -----------------------------------------------------
ANNUAL PAY                           15 YEARS   20 YEARS   25 YEARS   30 YEARS   35 YEARS
- -----------------------------------  ---------  ---------  ---------  ---------  ---------
                                                                  
$110,000...........................  $  52,142  $  60,356  $  68,570  $  76,784  $  84,997
 125,000...........................     59,492     68,906     78,320     87,734     97,147
 150,000...........................     79,242     90,656    102,070    113,484    124,897
 175,000...........................     92,742    106,156    119,570    132,984    146,397
 200,000...........................    106,242    121,656    137,070    152,484    167,897
 225,000...........................    119,742    137,156    154,570    171,984    189,397
 250,000...........................    133,242    152,656    172,070    191,484    210,897

 
    The years of credited service under the Pension Plan for the executive
officers shown in the preceding summary compensation table are as follows:
Daniel P. Landguth, 28 years; Dale E. Clement, 32 years; Everett E. Hoyt, 23
years; Gary R. Fish, 11 years; Thomas M. Ohlmacher, 23 years. Mr. Clement's and
Mr. Hoyt's benefits will be reduced for service from prior employment.
 
    The benefits in the foregoing table were calculated as a straight life
annuity. Amounts shown are exclusive of Social Security benefits and include
benefits from both the Pension Plan and from the PEP assuming a 100 percent
vested interest in the PEP.
 
EMPLOYEES' STOCK PURCHASE PLAN
 
    Employees of the Company and its subsidiaries are eligible to participate in
the Employees' Stock Purchase Plan, as approved by the shareholders at the 1987
Annual Meeting under which offerings of the Company's Common Stock, at the
discretion of the Board, are made to employees at a price equal to 90 percent of
the closing sale price on the New York Stock Exchange on the date of the
offering. Employees may purchase up to 400 shares per offering. An offering was
extended to employees in 1997 at a price of $17.44 per share (post-split price).
Shares are held in nominee name until subscriptions are paid for in full.
 
RETIREMENT SAVINGS PLAN
 
    The Company has a Retirement Savings Plan under Section 401(k) of the
Internal Revenue Code of 1954, as amended, which permits employees of the
Company and its subsidiaries, including officers, to elect to invest up to 15
percent of their eligible earnings on a pre-tax basis into an investment fund
subject to limitations imposed by the Internal Revenue Code. The Company makes
no contributions to the Plan.
 
    Distribution from the fund will be made to employees at termination of
employment, retirement, death, or in case of hardship. No amounts were paid or
distributed pursuant to the Retirement Savings Plan to the individuals named
herein nor to the officers as a group.
 
    The Trustee for the Retirement Savings Plan (401(k) Plan) has voting power
with respect to shares held in the name of the Trustee of the Plan.
 
                                       10

SEVERANCE AGREEMENTS
 
    The Company has entered into change of control severance agreements
("Severance Agreements") with each of its executive officers ("Executive") and
certain key employees. The Severance Agreements provide for certain payments and
other benefits to be payable upon a Change in Control and a subsequent
termination of employment, either involuntary or for a Good Reason.
 
    A Change in Control is defined as: (i) an acquisition of 30 percent or more
of the common stock of the Company (except for certain defined acquisitions,
such as acquisition by employee benefit plans, the Company itself, or any
subsidiary); or (ii) members of the Incumbent Board at the time the agreements
were executed cease to constitute at least two-thirds of the members of the
Board, with an Incumbent Board being defined at those individuals consisting of
the Board on the date the Agreement was executed and any other directors elected
subsequently whose election was approved by the Incumbent Board; or (iii)
approval by the shareholders of the Company of a merger, consolidation, or
reorganization; liquidation or dissolution; or agreement for sale or other
disposition of all or substantially all of the assets of the Company (with
exceptions for transactions which do not involve an effective change in control
of voting securities or Board membership, and transfers to subsidiaries or sale
of subsidiaries); and (iv) all regulatory approvals required to effect a Change
in Control have been obtained.
 
    A Good Reason for termination which would trigger payment of benefits is
defined to include (i) a change in the Executive's status, title, position or
responsibilities, (ii) a reduction in the Executive's annual compensation or any
failure to pay the Executive any compensation or benefits to which he or she is
entitled within 7 days of the date due, (iii) any material breach by the Company
of any provisions of the Severance Agreement, (iv) requiring the Executive to be
based outside a 50-mile radius from Rapid City, South Dakota; or (v) failure of
the Company to obtain an agreement from any successor company to assume and
agree to perform the Severance Agreement. The Severance Agreement with the Chief
Executive Officer ("CEO") also contains an optional Window Period, defined as a
30-day period of time beginning on the one-year anniversary after the Change in
Control, during which time the CEO may terminate for any reason and receive the
payments and benefits.
 
    Upon a Change in Control, the Executive will have an employment contract for
a three-year period (but not beyond age 65), denominated the "Employment Term."
During the Employment Term, the Executive shall receive annual compensation at
least equal to the highest rate in effect at any time during the one-year period
preceding the Change in Control and shall also receive employment welfare
benefits, pension benefits, and supplemental retirement benefits on a basis no
less favorable than those received prior to the Change in Control.
 
    If the Executive's employment with the Company is terminated during the
Employment Term, involuntarily or for a Good Reason (or by the CEO for any
reason during a Window Period), then the Executive is entitled to the following
benefits: (i) severance pay equal to 2.99 times Executive's five-year average
taxable compensation; provided that the foregoing payment is subject to
proportionate reduction based upon when termination takes place during the
Employment Term and based upon a ratio of Executive's Employment Term to 36
months; and (ii) continuation of employee welfare benefits for the remainder of
the Employment Term (with an offset for similar benefits received) along with
additional credited service under the Pension Equalization Plan and Pension Plan
equal to the remainder of the Employment Term.
 
    The Severance Agreement contains a "cap" provision which reduces any amounts
payable to an amount which would prevent any payments from being nondeductible
under the Internal Revenue Code. The Severance Agreements provide for
reimbursement of legal fees and expenses of the Executive incurred after the
Change in Control by the Executive in seeking to obtain or enforce any benefits
provided by the Severance Agreement. The Executive is not required to mitigate
the amount of any payment or benefit by seeking other employment or otherwise,
and the payments or benefits are not reduced whether or not the Executive
obtains other employment and/or benefits (except for employee welfare benefits).
 
                                       11

STOCK PERFORMANCE GRAPH
 
    The graph below compares the cumulative shareholder return on the Company's
Common Shares for the last five fiscal years with the cumulative total return of
the S&P 500 Index and the Edison Electric Institute Electric Index, (EEI
Electric Index) over the same period (assuming the investment of $100 on
December 31, 1992, and the reinvestment of all dividends).
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 


          COMPARISON OF FIVE YEAR CUMULATIVE TOTAL RETURN
                                                                                         
AMONG BLACK HILLS CORPORATION, THE S&P 500 INDEX
AND THE EEI 100 INDEX OF INVESTOR-OWNED ELECTRICS INDEX
                                                                          BLACK HILLS                  EEI 100 INDEX OF INVESTOR-
                                                                          CORPORATION    S&P 500                  OWNED ELECTRICS
1993                                                                              $87       $110                             $111
1994                                                                               87        112                               98
1995                                                                              107        153                              129
1996                                                                              129        189                              130
1997                                                                              170        252                              166

 
                                    ITEM II
                      APPOINTMENT OF INDEPENDENT AUDITORS
 
    The firm of Arthur Andersen LLP, independent public accountants, conducted
the audit of the Company and its subsidiaries for 1997. Representatives of
Arthur Andersen LLP will be present at the Annual Meeting and will have the
opportunity to make a statement, if they desire to do so, and to respond to
appropriate questions.
 
    Audit services performed by Arthur Andersen LLP during 1997 included audits
of the financial statements of the Company and its subsidiaries and analysis of
interim financial information.
 
    The Board of Directors, on recommendation of the Audit Committee and subject
to ratification by shareholders, has appointed Arthur Andersen LLP to perform an
audit of the consolidated financial statements of the Company and its
subsidiaries for the year 1998 and to render their opinion thereon.
 
           THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR RATIFICATION
             OF THE APPOINTMENT OF ARTHUR ANDERSEN LLP TO SERVE AS
                INDEPENDENT PUBLIC ACCOUNTANTS FOR THE YEAR 1998
 
                                       12

                 SHAREHOLDER PROPOSALS FOR 1999 ANNUAL MEETING
 
    Shareholder proposals intended to be presented at the 1999 Annual Meeting of
Shareholders must be received by the Secretary of the Company in writing at its
home offices at 625 Ninth Street, P.O. Box 1400, Rapid City, South Dakota 57709,
prior to November 30, 1998. Any proposal submitted must be in compliance with
Rule 14a-8 of Regulation 14A of the Securities and Exchange Commission.
 
                                    ITEM III
                         TRANSACTION OF OTHER BUSINESS
 
    The Board of Directors does not intend to present any business for action by
the shareholders at the meeting except the matters referred to in this Proxy
Statement. If any other matters should be properly presented at the meeting, it
is the intention of the persons named in the accompanying form of proxy to vote
thereon in accordance with the recommendations of the Board of Directors.
 
    If a shareholder participates in the Company's Dividend Reinvestment and
Stock Purchase Plan, the proxy to vote shares of record will serve as
instructions to vote shares held in custody for the shareholder. Accordingly, as
Transfer Agent for shares of the Company's Common Stock, Norwest Bank Minnesota,
N.A. will cause shares held in the name of its nominee for the account of a
shareholder participating in the Plan to be voted in the same way as that
shareholder votes shares registered in their name. If shareholders do not vote
the shares registered in their name, shares held for their account in the Plan
will not be voted.
 
    Please complete and sign the accompanying form of proxy whether or not you
expect to be present at the meeting and promptly return it in the enclosed
postage paid envelope.
 
                                          By Order of the Board of Directors
                                          ROXANN R. BASHAM
                                          VICE PRESIDENT -- FINANCE AND
                                          CORPORATE SECRETARY/TREASURER
 
Dated:  March 30, 1998
 
                                       13

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The information required by Item 13, Financial and Other Information, of
Regulation 14-A is provided in the Company's Annual Report to Shareholders and
Form 10-K for the year ended December 31, 1997, which is incorporated by
reference into this Proxy Statement.
 
    The Company's 1997 Annual Report to Shareholders and Form 10-K is being
mailed to Shareholders with this Proxy Statement.
 
                    PLEASE COMPLETE, SIGN AND RETURN PROMPTLY
                   THE ENCLOSED PROXY SO THAT YOUR STOCK MAY
                BE REPRESENTED AND VOTED AT THE ANNUAL MEETING.
 
                                       14

                            BLACK HILLS CORPORATION
      PROXY FOR ANNUAL MEETING OF SHAREHOLDERS, MAY 19, 1998 AT 9:30 A.M.
 
      The undersigned hereby appoints Daniel P. Landguth, Roxann R. Basham and
John K. Nooney, and any one or more of them, proxy attorneys, with full
substitution and revocation in each, to vote all shares of Common Stock of the
undersigned at the Annual Meeting of Shareholders of Black Hills Corporation to
be held on Tuesday, May 19, 1998 at 9:30 A.M., or at any adjournment thereof, as
follows:
 
1.  Election of Class III Directors
 
    Adil M. Ameer, Everett E. Hoyt, Thomas    / / FOR    / / WITHHELD AUTHORITY
    J. Zeller
 
    (To withhold authority to vote for any individual nominee, write the
    nominee's name in the space provided below. To cumulate votes so indicate.)
 
2.  Ratify the appointment of Arthur          / / FOR  / / AGAINST  / / ABSTAIN
    Andersen LLP to serve as the Company's
    independent auditors in 1998
 
If any other business is brought before the Meeting or any adjournment(s)
thereof, this Proxy will be voted in the discretion of the Appointed Proxies.
 
THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR ELECTING EACH OF THE DIRECTORS AND
 FOR RATIFYING THE APPOINTMENT OF ARTHUR ANDERSEN LLP TO SERVE AS THE COMPANY'S
                         INDEPENDENT AUDITORS IN 1998.

THIS PROXY, SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS, WILL BE VOTED AS
DIRECTED. IF NO DIRECTION TO THE CONTRARY IS INDICATED IT WILL BE VOTED IN
ACCORDANCE WITH THE BOARD OF DIRECTORS' RECOMMENDATIONS.
 
Black Hills Corporation, as Administrator under the Company's Dividend
Reinvestment and Stock Purchase Plan, is instructed to execute a proxy with
identical instructions, for any shares held for my benefit.
                                             Dated: ____________________________
                                             ___________________________________
                                                         (Signature)
                                             ___________________________________
                                                         (Signature)
 
                                             Please sign exactly as name(s)
                                             appear to the left. When signing in
                                             fiduciary or representative
                                             capacity, please add your full
                                             title. If shares are registered in
                                             more than one name, all holders
                                             must sign. If the signature is for
                                             a corporation, the handwritten
                                             signature and title of an
                                             authorized officer are required,
                                             together with the full corporate
                                             name.
 
                                               PLEASE COMPLETE, DATE, SIGN AND
                                               MAIL THIS PROXY IN THE ENCLOSED
                                                   POSTAGE PAID ENVELOPE.