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                            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))
    / /  Definitive Proxy Statement
    /X/  Definitive Additional Materials
    / /  Soliciting  Material  Pursuant  to  Section  240.14a-11(c)  or  Section
         240.14a-12

- --------------------------------------------------------------------------------
                          KANSAS CITY POWER & LIGHT COMPANY
                (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):

/ /  $125 per  Exchange Act  Rules 0-11(c)(1)(ii),  14a-6(i)(1), 14a-6(i)(2)  or
     Item 22(a)(2) of Schedule 14A.
/ /  $500  per  each party  to  the controversy  pursuant  to Exchange  Act Rule
     14a-6(i)(3).
/ /  Fee  computed  on   table  below   per  Exchange   Act  Rules   14a-6(i)(4)
     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:
        ------------------------------------------------------------------------
/x/  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:
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     4) Date Filed:
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                                  [KCPL LOGO]
 
                                                                  August 6, 1996
 
Dear Shareholder:
 
    On Friday, August 2, 1996, the United States District Court for the Western
District of Missouri ruled that under Missouri law, the KCPL/UtiliCorp merger is
subject to the affirmative vote of two-thirds of KCPL's outstanding shares. It
has been and, notwithstanding the District Court's decision, it remains KCPL's
position that the only KCPL shareholder vote required in connection with the
merger is the approval of the issuance of KCPL shares in the merger by a
majority of those shares voting at the Special Meeting of KCPL's shareholders.
 
    Quite frankly, we are both surprised and disappointed with the District
Court's ruling, which, if it remains in effect, would permit a relatively small
minority (including shares not even voted), to thwart the wishes of the holders
of a substantial majority of KCPL shares. Immediately following the Special
Meeting, KCPL intends to seek the District Court's authorization to file an
immediate appeal on an expedited basis to the United States Court of Appeals for
the Eighth Circuit. Additional information summarizing the status of this
litigation and certain other information is set forth in a short Proxy Statement
Supplement which accompanies this letter. In order to give you the opportunity
to consider these very recent developments, we are postponing the Special
Meeting of Shareholders until 10:00 a.m., Friday, August 16, 1996. The postponed
meeting will be held at the Westin Crown Center Hotel, One Pershing Road, Kansas
City, Missouri.
 
    Obviously, we would have strongly preferred to proceed with the Special
Meeting on Wednesday, August 7, as originally scheduled and bring this lengthy
process to a conclusion. We recognize that you have received many mailings and
telephone calls from both KCPL and Western Resources, and we apologize for any
inconvenience this may have caused you. Furthermore, we anticipate that Western
Resources will continue to contact you in order to seek your proxy and we urge
you not to sign any proxy furnished by Western Resources. We greatly appreciate
the support we have received from shareholders for the UtiliCorp merger, and we
ask you to show your continued support by voting FOR the KCPL/ UtiliCorp merger
on the enclosed WHITE proxy card. Please note that although the enclosed WHITE
proxy card continues to refer to the August 7, 1996 Special Meeting, as set
forth above and on the accompanying Notice of Postponed Special Meeting, the
Special Meeting will now be held on August 16, 1996.
 
    If you have any questions or need assistance in voting your shares, please
call KCPL Investor Relations at 800-245-5275 or our proxy solicitor, D.F. King &
Co., Inc., at 800-714-3312.
 
    Again, thank you for your continued patience and support.
 
                                          Very truly yours,
 
                                          /s/ Drue Jennings
 
                                          Drue Jennings
                                          Chairman of the Board,
                                            President and Chief
                                            Executive Officer

                       KANSAS CITY POWER & LIGHT COMPANY
                                  1201 Walnut
                          Kansas City, Missouri 64106
                            ------------------------
 
              NOTICE OF POSTPONED SPECIAL MEETING OF SHAREHOLDERS
                                August 16, 1996
                            ------------------------
 
    Notice is hereby given that a Postponed Special Meeting of Shareholders of
Kansas City Power & Light Company ("KCPL") will be held at the Westin Crown
Center Hotel, One Pershing Road, Kansas City, Missouri, on Friday, August 16,
1996, commencing at 10:00 a.m., local time (the "Meeting"). At the Meeting,
shareholders will be asked to consider and vote upon the following matters,
which are more fully described in the June 26, 1996 Joint Proxy
Statement/Prospectus (the "Joint Proxy Statement/ Prospectus") which was
previously distributed to shareholders, as supplemented by the accompanying
Proxy Statement Supplement:
 
    1.  A proposal to approve the issuance (the "Share Issuance") of up to a
       maximum of 54,000,000 shares of common stock, no par value, of KCPL
       ("KCPL Common Stock") pursuant to the Amended and Restated Agreement and
       Plan of Merger by and among KCPL, KC Merger Sub, Inc. ("Sub"), UtiliCorp
       United Inc. ("UCU") and KC United Corp., dated as of January 19, 1996, as
       amended and restated as of May 20, 1996 (as amended, the "Merger
       Agreement"), providing for (i) the merger of Sub with and into UCU, with
       UCU surviving (the "UCU Merger"), and (ii) immediately thereafter, the
       merger of UCU, as the corporation surviving the UCU Merger, with and into
       KCPL, with KCPL surviving (the "Consolidating Merger" and together with
       the UCU Merger, the "Mergers"). As part of the Consolidating Merger,
       KCPL, as the corporation surviving in the Consolidating Merger, will be
       renamed Maxim Energies, Inc. ("Maxim"). Pursuant to the Merger Agreement,
       each issued and outstanding share of common stock, $1.00 par value per
       share, of UCU ("UCU Common Stock") will be converted into one share of
       Maxim Common Stock in the UCU Merger. Each issued and outstanding share
       of KCPL Common Stock held by KCPL shareholders will remain outstanding
       after the Mergers (except that each such share shall be referred to as
       one share of Maxim Common Stock).
 
    2.  A proposal to approve the Maxim Stock Incentive Plan, a copy of which
       was provided as Annex D to the Joint Proxy Statement/Prospectus.
 
    3.  A proposal to approve the Maxim Management Incentive Compensation Plan
       (the "Maxim MIC Plan"), a copy of which was provided as Annex E to the
       Joint Proxy Statement/ Prospectus.
 
    Only shareholders of record at the close of business on June 26, 1996, will
be entitled to notice of and to vote at the Meeting or at any further
adjournment or postponement thereof. KCPL shareholders are not entitled to
dissenters' rights of appraisal.
 
    Approval of the Share Issuance is a condition to the consummation of the
Mergers. The consummation of the Mergers is also subject to the approval of the
holders of UCU Common Stock, certain required regulatory approvals and other
conditions. If approved by the shareholders, the Maxim Stock Incentive Plan and
the Maxim MIC Plan will be implemented only if the Mergers are consummated.

    YOUR BOARD OF DIRECTORS HAS, BY A UNANIMOUS VOTE, APPROVED THE MERGER
AGREEMENT, THE MERGERS AND THE TRANSACTIONS CONTEMPLATED THEREBY AND RECOMMENDS
THAT SHAREHOLDERS VOTE FOR APPROVAL OF THE SHARE ISSUANCE, FOR APPROVAL OF THE
MAXIM STOCK INCENTIVE PLAN AND FOR APPROVAL OF THE MAXIM MIC PLAN.
 
                                          By Order of the Board of Directors
 
                                          /s/ Jeanie Sell Latz
                                          Jeanie Sell Latz
                                          SECRETARY
Kansas City, Missouri
August 6, 1996
 
 YOUR VOTE IS IMPORTANT REGARDLESS OF THE NUMBER OF SHARES YOU OWN. WHETHER OR
 NOT YOU EXPECT TO ATTEND THE MEETING, PLEASE SIGN, DATE AND PROMPTLY RETURN THE
 ACCOMPANYING WHITE PROXY USING THE ENCLOSED, SELF-ADDRESSED ENVELOPE, WHICH
 REQUIRES NO POSTAGE IF MAILED IN THE UNITED STATES. IF FOR ANY REASON YOU
 SHOULD DESIRE TO REVOKE YOUR PROXY, YOU MAY DO SO AT ANY TIME BEFORE IT IS
 VOTED AT THE MEETING.
 
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                       KANSAS CITY POWER & LIGHT COMPANY
                                  1201 WALNUT
                          KANSAS CITY, MISSOURI 64106
                                 (816) 556-2200
                            ------------------------
 
                           PROXY STATEMENT SUPPLEMENT
                              Dated August 6, 1996
                            ------------------------
 
    This Proxy Statement Supplement is furnished by the Board of Directors of
Kansas City Power & Light Company ("KCPL") in connection with KCPL's Postponed
Special Meeting of Shareholders (the "Postponed Special Meeting") scheduled to
be held on August 16, 1996 and at any further adjournment or postponement
thereof. It amends and supplements, and should be read in conjunction with, the
Joint Proxy Statement/Prospectus of KCPL and UtiliCorp United Inc.
("UtiliCorp"), dated June 26, 1996 (the "Joint Proxy Statement/Prospectus").
 
 THE BOARD OF DIRECTORS OF KCPL URGES YOU TO VOTE FOR THE PROPOSED MERGER WITH
 UTILICORP. YOUR VOTE IS IMPORTANT. PLEASE SIGN, DATE AND MAIL THE ENCLOSED
 WHITE PROXY CARD TODAY.
 
                              RECENT DEVELOPMENTS
 
    Set forth below is a description of certain very recent significant
developments.
 
Certain Litigation
 
    As previously disclosed, on May 20, 1996, KCPL commenced litigation
captioned KANSAS CITY POWER & LIGHT CO. V. WESTERN RESOURCES, INC., ET AL., C.A.
No. 96-0552-CV-W-5 in the United States District Court for the Western District
of Missouri, Western Division (the "District Court"), against Western Resources,
Inc. ("Western Resources") and Robert L. Rives ("Rives"). In this litigation,
KCPL sought a declaratory judgment that the Amended and Restated Agreement and
Plan of Merger by and among KCPL, KC Merger Sub Inc., UtiliCorp and KC United
Corp., dated as of January 19, 1996, as amended and restated as of May 20, 1996
(the "Merger Agreement"), and the transactions contemplated thereby
(collectively, the "Merger") were adopted and may be completed in accordance
with Missouri law and are not void, voidable, subject to injunction or
rescission based upon any claim that KCPL's directors, officers or agents acted
illegally or inequitably in adopting the Merger Agreement. On May 24, 1996, Jack
R. Manson ("Manson"), a shareholder of KCPL, filed a motion to intervene in the
above action as a representative of a class consisting of similarly situated
KCPL shareholders. On June 7, 1996, this motion to intervene was granted. Manson
filed counterclaims against KCPL and each of its directors alleging that KCPL
and its directors breached fiduciary duties of care, loyalty and disclosure in
responding to Western Resources' acquisition overtures, including their adoption
of the Merger Agreement; that their actions in adopting the Merger Agreement
were illegal and ULTRA VIRES; that the adoption of the Merger Agreement
illegally deprived KCPL shareholders of voting and appraisal rights under
Missouri law; and that the adoption of the Merger Agreement was a
disproportionate response to Western Resources' acquisition offer.
 
    On June 7, 1996, Western Resources and Rives answered the complaint in the
above action and asserted two counterclaims against KCPL, alleging that the
Merger Agreement is illegal under Missouri law because it does not require
approval of two-thirds of all outstanding KCPL shares and does not provide
dissenters' rights to KCPL shareholders, and that the directors of KCPL breached
their fiduciary duties by adopting the Merger Agreement.
 
    On July 25 and 26, 1996, the District Court heard evidence and argument on
the issues of the legality of the Merger Agreement and its adoption. On August
2, 1996, the District Court issued an order directed to the legality of the
Merger Agreement. While the District Court ruled that each of the transactions
contemplated by the Merger Agreement were legally valid and authorized under
Missouri law, it held that because the result of the transactions would be a
merger of KCPL and UtiliCorp, the Missouri statute requiring approval of a
merger by two-thirds of the outstanding shares of the merging

corporation's stock is applicable to the Merger Agreement. The District Court
also noted that its holding did not in any way attempt to evaluate the merger
proposals before the KCPL shareholders and that the value of either transaction
was irrelevant to its interpretation of Missouri's laws.
 
    KCPL believes that the District Court's conclusion that Missouri law
requires that the Merger be approved by two-thirds of KCPL's outstanding shares
is erroneous, and continues to believe that the only KCPL shareholder vote
required in connection with the Merger is the approval of the issuance of KCPL
shares pursuant to the Merger Agreement (the "Share Issuance") by the
affirmative vote of the holders of a majority of KCPL shares voting at a meeting
at which a quorum is present, as required by the rules of the New York Stock
Exchange. The District Court indicated at a hearing held on August 5, 1996 that
it would consider entering an order that would permit immediate appeal of its
August 2, 1996 ruling to the United States Court of Appeals for the Eighth
Circuit (the "Court of Appeals"), after the Postponed Special Meeting is held.
Assuming a majority of the KCPL shares voting at the Postponed Special Meeting
approve the Share Issuance, KCPL intends to seek immediate leave of the District
Court to pursue an immediate, expedited appeal to the Court of Appeals.
 
    There can be no assurance that an appeal will proceed or as to the timing or
the outcome thereof. If, however, the District Court's August 2, 1996 order
remains in effect, the Merger will not be deemed approved under Missouri law
unless the holders of two-thirds of all KCPL shares outstanding vote in favor of
the Share Issuance at the Postponed Special Meeting. If the Share Issuance is
approved by the holders of two-thirds of all outstanding KCPL shares, such
approval shall be deemed to constitute approval of the Merger under Missouri
law. In that circumstance, KCPL would expect that it would not pursue an appeal.
 
    If a majority of the shares voting at the Postponed Special Meeting approve
the Share Issuance and the District Court permits KCPL's appeal of the District
Court's August 2, 1996 ruling to the Court of Appeals, there may be an extended
period of time before the Court of Appeals renders a decision. In the event,
however, that KCPL's position is upheld on appeal, the vote at the Postponed
Special Meeting will be valid and binding and constitute effective shareholder
approval of the Share Issuance. In such case, all KCPL shareholder action
required in connection with the Merger will have been taken.
 
    The Joint Proxy Statement/Prospectus is modified as set forth herein.
 
                  YOUR VOTE IS IMPORTANT -- PLEASE VOTE TODAY
 
    To protect the value of your KCPL shares, we strongly urge you to vote "FOR"
the KCPL/ UtiliCorp merger today by signing, dating and returning the enclosed
WHITE proxy card in the accompanying postage-paid return envelope. A failure to
approve the KCPL/UtiliCorp merger would deprive you of its many benefits, with
no assurance that a transaction with Western Resources would ever occur. Even if
you have sold your shares since the June 26, 1996 record date, as the holder of
record you are still entitled to exercise your right to vote and we urge you to
do so.
 
    Please note that although the enclosed WHITE proxy card continues to refer
to the August 7, 1996 Special Meeting, as set forth above and on the
accompanying Notice of Postponed Special Meeting of Shareholders, the Postponed
Special Meeting will now be held at 10:00 a.m., local time, on August 16, 1996
at the Westin Crown Center Hotel, One Pershing Road, Kansas City, Missouri.
 
                                          By Order of the Board of Directors
 
                                          /s/ Jeanie Sell Latz
                                          Jeanie Sell Latz
                                          Secretary
Dated: August 6, 1996
 
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