UTILICORP UNITED INC
424B1, 1996-11-21
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
                                                Filed Pursuant to Rule 424(b)(1)
                                                      Registration No. 333-14869
PROSPECTUS
                                [UtiliCorp Logo]
 
                                5,250,000 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
 
                               "$1.00 PAR VALUE"
                                ----------------
 
    The  outstanding shares  of the Common  Stock of UtiliCorp  United Inc. (the
"Company" or "UtiliCorp") are, and the shares offered hereby will be, listed  on
the  New York,  Pacific and  Toronto Stock  Exchanges under  the symbol  UCU. On
November 20, 1996, the last reported sale  price of the Common Stock on the  New
York Stock Exchange was $27.625 per share.
                              -------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
    EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION  NOR HAS THE
       SECURITIES AND EXCHANGE  COMMISSION OR  ANY STATE  SECURITIES
            COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF
                THIS PROSPECTUS. ANY REPRESENTATION TO  THE
                           CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                             UNDERWRITING
                                                               DISCOUNTS
                                            PRICE TO        AND COMMISSIONS      PROCEEDS TO
                                             PUBLIC               (1)            COMPANY (2)
<S>                                     <C>                <C>                <C>
Per Share                                    $27.625             $.83              $26.795
Total (3)                                 $145,031,250        $4,357,500        $140,673,750
</TABLE>
 
(1) The Company has agreed to indemnify the several Underwriters against certain
    civil  liabilities, including liabilities under  the Securities Act of 1933,
    as amended. See "Underwriting".
(2) Before deduction of expenses payable by the Company estimated at $350,000.
(3) The Company has granted the Underwriters  a 30-day option to purchase up  to
    750,000  additional shares of  Common Stock on  the same terms  as set forth
    above to cover over-allotments, if any. If such option is exercised in full,
    the total  Price  to  Public, Underwriting  Discounts  and  Commissions  and
    Proceeds  to  Company  will be  $165,750,000,  $4,980,000  and $160,770,000,
    respectively. See "Underwriting".
                              -------------------
 
    The shares of  Common Stock are  being offered by  the several  Underwriters
named  herein,  subject to  prior sale,  when, as  and if  accepted by  them and
subject to certain conditions. It is  expected that certificates for the  shares
of  Common Stock offered hereby will be made available for delivery in New York,
New York on or about November 26, 1996.
                              -------------------
MERRILL LYNCH & CO.
       DEAN WITTER REYNOLDS INC.
               GOLDMAN, SACHS & CO.
                      J.P. MORGAN & CO.
<PAGE>
                                                        PAINEWEBBER INCORPORATED
                                  ------------
 
               The Date of this Prospectus is November 20, 1996.
<PAGE>
                                     [LOGO]
                              [SERVICE AREA MAPS]
A  PRESENTATION  OF  THREE  MAPS  IS  SHOWN  INDICATING  THE  COMPANY'S  SERVICE
TERRITORIES   FOR   ITS   UTILITY   OPERATIONS,   NON-UTILITY   OPERATIONS   AND
INTERNATIONAL, RESPECTIVELY.
 
THE  FIRST MAP  INDICATES AREAS OF  THE COMPANY'S ELECTRIC,  GAS AND COMBINATION
UTILITY OPERATIONS  IN MINNESOTA,  IOWA, NEBRASKA,  COLORADO, KANSAS,  MISSOURI,
MICHIGAN, WEST VIRGINIA AND BRITISH COLUMBIA, CANADA.
 
THE  SECOND MAP INDICATES THE AREAS AND LOCATIONS OF THE COMPANY'S GAS MARKETING
AREA (45 STATES, PART OF CANADA AND MEXICO), GAS PIPELINES (TEXAS AND OKLAHOMA),
GAS PROCESSING  PLANTS  (TEXAS  AND OKLAHOMA)  AND  INDEPENDENT  POWER  PROJECTS
(WASHINGTON, CALIFORNIA, MAINE, NEW YORK, PENNSYLVANIA, ALABAMA AND FLORIDA).
 
THE THIRD MAP INDICATES THE LOCATION OF THE COMPANY'S INVESTMENTS IN NEW ZEALAND
ELECTRIC  OPERATIONS,  AUSTRALIAN ELECTRIC  OPERATIONS AND  JAMAICAN INDEPENDENT
POWER PROJECT AND ITS UNITED KINGDOM GAS MARKETING AREA.
<PAGE>
                                     [LOGO]
 
                MERGERS, ACQUISITIONS AND INVESTMENTS SINCE 1984
 
<TABLE>
<CAPTION>
                                                                                              COST
                                                                      CUSTOMERS AS OF     (DOLLARS IN
                                          SERVICE        OWNERSHIP        9/30/96          MILLIONS)
                                      ----------------  ------------  ---------------  ------------------
<S>                                   <C>               <C>           <C>              <C>
ORIGINAL UTILITY OPERATIONS(A):
Missouri Public Service.............      Electric      100%                190,000            --
Missouri Public Service.............        Gas         100                  42,000            --
                                                                      ---------------
    TOTAL...........................                                        232,000
                                                                      ---------------
NORTH AMERICAN UTILITY MERGERS AND
  ACQUISITIONS:
Kansas Public Service...............        Gas         100%                 27,000        $      4.8
Peoples Natural Gas.................        Gas         100                 532,000             246.0(b)
Northern Minnesota Utilities........        Gas         100                  32,000              22.0
West Virginia Power.................      Electric      100                  26,000              21.0
West Kootenay Power.................      Electric      100                  82,000              62.0
Michigan Gas Utilities..............        Gas         100                 138,000              62.0
West Virginia gas system............        Gas         100                  23,000               3.0
WestPlains Energy...................      Electric      100                 141,000             209.2(c)
Missouri Intrastate Pipeline........      Pipeline      100                 --                   78.0
Kansas gas system...................        Gas         100                 (d)                  23.0
Nebraska gas system.................        Gas         100                 (d)                   78.0   (e)
                                                                      ---------------         --------
    TOTAL...........................                                       1,001,000   $         809.0
                                                                      ---------------         --------
INTERNATIONAL INVESTMENTS:
Power New Zealand Ltd...............      Electric      29.4%(f)             216,000   $         125.7
WEL Energy Group Ltd................      Electric      39.0(f)               65,000              42.1
United Energy Ltd...................      Electric      49.9                 533,000             257.9
                                                                      ---------------         --------
    TOTAL...........................                                         814,000   $         425.7
                                                                      ---------------         --------
NON-REGULATED ACQUISITIONS AND
  INVESTMENTS:
UtilCo Group investments............    Independent
                                       Power Projects   22-50%              --         $         209.5
Other...............................   Gas marketing
                                         and other      100                 --                   171.8
                                                                                              --------
    TOTAL...........................                                                   $         381.3
                                                                                              --------
          TOTAL.....................                                       2,047,000   $       1,616.0
                                                                      ---------------         --------
                                                                      ---------------         --------
</TABLE>
 
- ------------
 
(a)  UtiliCorp  was formed in  1985 from Missouri  Public Service Company, which
     was founded in 1917.
 
(b)  Not including the  Nebraska gas  system acquired  in February  1993 or  the
     Kansas  gas system acquired in September 1994.  Both now operate as part of
     Peoples Natural Gas.
 
(c)  The total value of the WestPlains Energy acquisition transaction was $349.8
     million, including the  $209.2 million cash  purchase price, assumption  of
     $26.0  million in  debt, and  the purchase  by a  third party  of ownership
     interest in a generating facility for $114.6 million. WestPlains Energy has
     use of that generating capacity through a 27-year operating lease.
 
(d)  Customers are included in Peoples Natural Gas above.
 
(e)  Excluding $21.0 million in working capital and liabilities assumed.
 
(f)  Interests are held through a 79% owned subsidiary of the Company.
<PAGE>
                             AVAILABLE INFORMATION
 
    UtiliCorp  is  subject to  the  information requirements  of  the Securities
Exchange Act  of 1934,  as  amended (the  "Exchange  Act"), and,  in  accordance
therewith,  files  reports,  proxy  statements and  other  information  with the
Securities and  Exchange  Commission  (the "Commission").  Such  reports,  proxy
statements and other information can be inspected and copied at public reference
facilities  of the Commission at Room  1024, 450 Fifth Street, N.W., Washington,
D.C. 20549;  and at  the Commission's  Regional Offices  located at  Room  1400,
Northwestern  Atrium  Center,  500  West Madison  Street,  Suite  1400, Chicago,
Illinois 60661; and 7 World Trade Center, Suite 1300, New York, New York  10048.
Copies  of  such material  can be  obtained  by mail  from the  Public Reference
Section of the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,  at
prescribed  rates. In addition, reports,  proxy statements and other information
concerning UtiliCorp  may be  inspected at  the offices  of the  New York  Stock
Exchange,  20  Broad Street,  New York,  New  York 10005  and the  Pacific Stock
Exchange, 301 Pine Street,  San Francisco, California  94104. Such material  may
also  be accessed electronically by  means of the Commission's  home page on the
Internet at
http://www.sec.gov.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following documents filed by the Company with the Commission pursuant to
the Exchange Act are incorporated in this Prospectus by reference:
 
       (a) The Company's Annual Report  on Form 10-K for  the fiscal year  ended
           December 31, 1995;
 
       (b) The  Company's  Quarterly  Report on  Form  10-Q, as  amended  by the
           Company's Quarterly  Report on  Form 10-Q/A,  for the  quarter  ended
    March 31, 1996;
 
       (c) The  Company's Quarterly Reports on Form  10-Q for the quarters ended
           June 30, 1996 and September 30, 1996;
 
       (d) The Company's Current Reports on Form 8-K dated January 19, 1996, May
           22, 1996, May 28, 1996 and September 30, 1996; and
 
       (e) The Company's  Current  Reports  on  Form  8-K,  as  amended  by  the
           Company's Current Reports on Form 8-K/A, dated April 1, 1996.
 
    All  documents filed by the Company pursuant  to Section 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of this offering shall be deemed to be incorporated by reference
in this  Prospectus and  to  be a  part  hereof from  the  date of  filing  such
documents.  Any statement contained  in a document incorporated  or deemed to be
incorporated by reference herein shall  be modified or superseded, for  purposes
of  this Prospectus, to the  extent that a statement  contained herein or in any
subsequently filed  document which  is deemed  to be  incorporated by  reference
herein  modifies  or supersedes  such statement.  Any  statement so  modified or
superseded shall  not  be  deemed,  except as  so  modified  or  superseded,  to
constitute a part of this Prospectus.
 
    The  Company hereby undertakes  to provide without charge  to each person to
whom a  copy of  this Prospectus  has been  delivered, on  the written  or  oral
request  of any such person, a  copy of any or all  of the documents referred to
above which have been  or may be incorporated  in this Prospectus by  reference,
other  than exhibits  to such  documents unless  such exhibits  are specifically
incorporated by reference into such documents. Such requests should be  directed
to Mr. Dale J. Wolf, Vice President, Finance, Treasurer and Corporate Secretary,
UtiliCorp  United  Inc.,  911  Main,  P.O.  Box  13287,  Kansas  City,  Missouri
64199-3287, telephone number (816) 421-6600.
 
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK AT
A  LEVEL  ABOVE THAT  WHICH MIGHT  OTHERWISE  PREVAIL IN  THE OPEN  MARKET. SUCH
TRANSACTIONS MAY BE EFFECTED ON THE NEW YORK, PACIFIC OR TORONTO STOCK EXCHANGES
OR OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                                       2
<PAGE>
                               PROSPECTUS SUMMARY
 
    THIS  SUMMARY  IS  QUALIFIED IN  ITS  ENTIRETY  BY, AND  SHOULD  BE  READ IN
CONJUNCTION WITH, THE INFORMATION APPEARING ELSEWHERE IN THIS PROSPECTUS AND  IN
THE DOCUMENTS, FINANCIAL STATEMENTS AND OTHER INFORMATION INCORPORATED HEREIN BY
REFERENCE.
 
                                  THE OFFERING
 
<TABLE>
<S>                                           <C>
Company.....................................  UtiliCorp United Inc.
 
Securities Offered (1)......................  5,250,000 shares of Common Stock (par value
                                              $1 per share)
 
Approximate Number of Shares Outstanding
 After the Offering (1).....................  52,297,376 shares
 
Common Stock Price Range: January 1, 1996
 through November 20, 1996..................  $30 1/2 - $25 3/4
 
Listing.....................................  New York, Pacific and Toronto Stock
                                              Exchanges (Symbol: UCU)
 
Indicated Annual Dividend Rate..............  $1.76 per share, paid quarterly
 
Book Value Per Share at September 30,
 1996.......................................  $20.91
 
Use of Proceeds.............................  To reduce short-term indebtedness incurred
                                              for acquisitions, construction and debt
                                               retirements and for general corporate
                                               purposes
</TABLE>
 
- ------------
(1) Does not include an additional 750,000 shares subject to the Underwriters'
    over-allotment option. See Cover Page and "Underwriting".
 
                                       3
<PAGE>
                                  THE COMPANY
 
    UtiliCorp  is an international  energy and energy  services company based in
Kansas City, Missouri. The Company's  energy operations consist of electric  and
natural  gas utility operations, natural gas gathering, marketing and processing
and investments in independent power projects.  Since being formed in 1985  from
Missouri Public Service Company, UtiliCorp has grown principally through utility
mergers, acquisitions and investments totaling approximately $1.6 billion, which
includes  the investment of more than $300 million in non-regulated acquisitions
and investments. For the ten-year period ending December 31, 1995, the Company's
sales have  grown  from  approximately  $243.2  million  to  approximately  $2.8
billion,  an average annual growth  rate of 27.7%. Over  the same period, income
from operations  has grown  from approximately  $62.9 million  to  approximately
$225.1 million, an average annual growth rate of 13.6%.
 
    UtiliCorp  and its subsidiaries  and joint ventures  serve approximately 2.0
million electric  and  gas  utility  customers in  eight  states,  one  Canadian
province,  Australia  and New  Zealand.  The Company's  North  American electric
utility operations  serve  approximately 439,000  customers  in four  states  --
Missouri,  Kansas, Colorado, and  West Virginia -- and  the Canadian province of
British  Columbia.  The   Company's  domestic  gas   utility  operations   serve
approximately  800,000 customers in eight  states -- Missouri, Kansas, Colorado,
Iowa, Nebraska, Minnesota, Michigan and West Virginia. The Company's  Australian
electric  distribution joint  venture serves approximately  533,000 customers in
metropolitan Melbourne. The Company also  owns equity interests in two  electric
distribution  utilities in  New Zealand serving  approximately 280,000 customers
and sells  natural gas  to wholesale  and commercial  businesses in  the  United
Kingdom through subsidiaries and joint ventures.
 
    UtiliCorp's  strategy is to be a  multinational provider of energy solutions
to its  customers.  As part  of  this  strategy, UtiliCorp,  in  1995,  launched
EnergyOneSM,  the first  nationally branded  line of  products and  services for
electric and gas utility  customers. The Company  believes that the  EnergyOneSM
portfolio of value-added services and tailored energy solutions is a key part of
its   strategy.  In  addition,  the  Company  recently  realigned  its  domestic
operations into three business groups  to better serve its customers:  UtiliCorp
Energy  Delivery,  UtiliCorp Energy  Group and  UtiliCorp Energy  Solutions. The
Company's international operations are managed separately.
 
    Aquila Energy Corporation, a  wholly-owned subsidiary of UtiliCorp,  markets
natural  gas in 45 states  as well as parts of  Canada and Mexico. Aquila Energy
Corporation's 82%  owned subsidiary,  Aquila Gas  Pipeline Corporation,  has  an
interest  in 14  natural gas gathering  systems and four  natural gas processing
plants in Texas  and Oklahoma.  Through its  UtilCo Group  Inc. subsidiary,  the
Company  owns interests  in 17  independent power  projects in  seven states and
Jamaica.
 
    In 1995,  Aquila Power  Corporation was  formed as  a subsidiary  of  Aquila
Energy  Corporation to take advantage  of opportunities in wholesale electricity
marketing and brokering. On January 11, 1995, Aquila Energy Corporation received
approval from the Federal Energy Regulatory Commission to market electricity  to
wholesale customers such as utilities and municipalities.
 
    In  1995, the Company's North American electricity requirements were met 61%
by the  Company's own  generation facilities  and 39%  by purchased  power.  The
Company  owns  regulated  electric  generating  facilities  with  a  total 1,785
megawatts of capacity. The Company's electric power generation is fueled 69%  by
coal  fired facilities, 21% by hydroelectric  facilities, and 10% by natural gas
or oil  fired  facilities.  UtiliCorp  neither owns  nor  operates  any  nuclear
generating assets.
 
                                       4
<PAGE>
                         SUMMARY FINANCIAL INFORMATION
                 (DOLLARS IN MILLIONS EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                        TWELVE MONTHS ENDED
                                                        SEPTEMBER 30, 1996*        YEARS ENDED DECEMBER 31,
                                                      ------------------------  -------------------------------
INCOME STATEMENT DATA:                                PRO FORMA (1)   ACTUAL      1995       1994       1993
                                                      -------------  ---------  ---------  ---------  ---------
<S>                                                   <C>            <C>        <C>        <C>        <C>
  Sales (2).........................................   $   3,606.0   $ 3,606.0  $ 2,798.5  $ 2,398.1  $ 2,746.1
  Income from Operations (3)(4)(5)..................         181.6       181.6      225.1      228.0      144.0
  Net Income (6)(7).................................          90.8        85.3       79.8       94.4       86.4
  Earnings Available for Common Shares..............          88.7        83.2       77.7       91.4       79.5
  Primary Earnings Per Common Share.................          1.72        1.79       1.72       2.08       1.95
  Fully Diluted Earnings Per Common Share...........          1.71        1.79       1.71       2.06       1.92
  Cash Dividends Per Common Share...................          1.75        1.75       1.72       1.70       1.62
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                        AS OF SEPTEMBER 30, 1996*
                                                                                        -------------------------
                                                                                         AS ADJUSTED
BALANCE SHEET DATA:                                                                          (8)         ACTUAL
                                                                                        --------------  ---------
<S>                                                                                     <C>             <C>
  Total Assets........................................................................    $  4,045.8    $ 3,961.8
  Short-Term Debt (Including Current Maturities)......................................         199.7        356.0
  Long-Term Debt......................................................................       1,472.9      1,372.9
  Preference and Preferred Stock (9)..................................................         125.4        125.4
  Common Shareholders' Equity.........................................................       1,124.0        983.7
</TABLE>
 
- ---------------
*    Unaudited
 
(1)  The  pro forma  financial data  give effect to:  (a) the  sale of 5,250,000
     shares of  Common Stock  offered  pursuant to  the offering  (assuming  the
     Underwriters'   over-allotment  option  is  not   exercised)  and  (b)  the
     application of the  net proceeds as  described under "Use  of Proceeds  and
     Financing  Program" as  though they  had occurred  at the  beginning of the
     period indicated. The pro forma income statement impact for the issuance of
     $100 million of Senior Notes as described in "Recent Developments" has been
     excluded due to immateriality.
 
(2)  In 1995, the Company changed its method of accounting for domestic  natural
     gas  trading  operations  to  the  mark-to-market  method.  This  change in
     accounting increased sales and income from operations by $29.8 million, net
     income by $18.3 million ($.40 per fully diluted share) and total assets  by
     $201.9  million. This change in accounting  has been reflected from January
     1, 1995. The effect on prior periods was not material.
 
(3)  In 1993, Aquila Energy Corporation, a subsidiary of the Company, recorded a
     $69.8  million  pre-tax  restructuring  charge  ($45.0  million  after-tax)
     against  earnings ($1.02  per fully diluted  share) related to  a change in
     strategic direction.
 
(4)  In 1995, the Company recorded a $34.6 million pre-tax charge ($19.6 million
     after-tax, or $.43 per fully-diluted share) related to impaired assets.
 
(5)  In the  third  quarter of  1996,  the  Company expensed  $11.0  million  of
     deferred merger costs. See "Recent Developments".
 
(6)  In  1993,  Aquila  Energy  Corporation  sold  18%  of  Aquila  Gas Pipeline
     Corporation in an initial public  offering resulting in a non-taxable  gain
     of $47.8 million ($1.08 per fully diluted share).
 
(7)  In  1996, the  Company recorded an  $11.8 million after-tax  gain ($.25 per
     fully  diluted  share)  primarily  from  the  effects  of  a  sales   lease
     transaction at a UtilCo Group Inc. partnership.
 
(8)  The  as  adjusted  financial data  give  effect  to: (a)  the  sale  of the
     5,250,000 shares of Common Stock offered pursuant to the offering (assuming
     the  Underwriters'  over-allotment  option  is  not  exercised);  (b)   the
     application  of the  net proceeds as  described under "Use  of Proceeds and
     Financing Program"; (c) the pro forma balance sheet impact for the issuance
     of $100 million of Senior Notes as described in "Recent Developments";  and
     (d)  the  acquisition  of an  additional  25% ownership  interest  in Oasis
     Pipeline Company as described in "Recent Developments".
 
(9)  Includes $100 million of Company-obligated mandatorily redeemable preferred
     securities of a partnership, $25 million preference stock and approximately
     $400,000 preferred stock of a Company subsidiary.
 
                                       5
<PAGE>
                                  THE COMPANY
 
    UtiliCorp  is an international energy and energy services company consisting
of electric and natural gas utility operations, natural gas gathering, marketing
and processing  and investments  in independent  power projects.  The  Company's
activities are primarily managed through three business groups: UtiliCorp Energy
Delivery  ("UED"), consisting primarily of transmission and distribution utility
operations,  UtiliCorp  Energy  Group  ("UEG"),  consisting  of  gas  marketing,
processing,   gathering  and  electricity  marketing,  as  well  as  electricity
generation and  independent power  production,  and UtiliCorp  Energy  Solutions
("UES"),  consisting  of gas  marketing, appliance  service contracts  and other
energy related products and  services. UtiliCorp's international operations  are
managed  separately from  these business groups.  The Company  has its Executive
Offices at  911  Main,  Kansas  City, Missouri  64105,  telephone  number  (816)
421-6000.
 
    UtiliCorp  and its subsidiaries  and joint ventures  serve approximately 2.0
million electric  and  gas  utility  customers in  eight  states,  one  Canadian
province,  Australia  and New  Zealand.  The Company's  North  American electric
utility operations  serve  approximately 439,000  customers  in four  states  --
Missouri,  Kansas, Colorado, and  West Virginia -- and  the Canadian province of
British  Columbia.  The   Company's  domestic  gas   utility  operations   serve
approximately  800,000 customers in eight  states -- Missouri, Kansas, Colorado,
Iowa, Nebraska, Minnesota, Michigan and West Virginia.
 
    In 1995, UtiliCorp launched EnergyOneSM,  the first nationally branded  line
of products and services for electric and gas utility customers. The EnergyOneSM
portfolio of value-added services and tailored energy solutions is a key part of
the Company's strategy to become a multinational provider of energy solutions to
its customers.
 
    Aquila   Energy  Corporation   ("Aquila"),  a   wholly-owned  subsidiary  of
UtiliCorp, markets natural  gas in  45 states  as well  as parts  of Canada  and
Mexico.  Aquila's 82% owned subsidiary, Aquila Gas Pipeline Corporation ("AGP"),
owns or has interests in 14 natural  gas gathering systems and four natural  gas
processing  plants  in  Texas  and  Oklahoma.  Through  its  UtilCo  Group  Inc.
subsidiary ("UtilCo"),  the  Company  owns interests  in  17  independent  power
projects  in seven states and Jamaica. UtiliCorp also markets natural gas in the
United Kingdom.
 
    In Australia, UtiliCorp owns a 49.9% interest in United Energy Ltd. ("United
Energy"), the first Australian electric  distribution company to be  privatized.
United  Energy serves approximately 533,000 customers in metropolitan Melbourne.
Utilicorp N.Z., Inc.  ("UNZ"), a  79% owned subsidiary  of the  Company, owns  a
29.4%  interest in Power New Zealand  Ltd. ("PNZ"), New Zealand's second largest
electric distribution utility, which  serves approximately 216,000 customers  in
the Auckland area. In addition, UNZ owns a 39% interest in WEL Energy Group Ltd.
("WEL"), a New Zealand electric distribution utility serving 65,000 customers in
the Waikato region.
 
    The Company is actively seeking expansion through the prudent acquisition of
utility  and  other  energy  related  properties,  including  electric  and  gas
operating utilities, electric  generating assets and  natural gas gathering  and
processing facilities.
 
UTILICORP ENERGY DELIVERY
 
    UtiliCorp Energy Delivery consists primarily of the Company's U.S. regulated
transmission  and distribution  operations, which  operate in  eight states. The
Company, through its UED operations, strives to be a competitively priced,  safe
and  reliable  provider of  electricity and  natural gas  to nearly  1.2 million
regulated customers.
 
GAS OPERATIONS
 
    The Company's  gas utilities  serve  800,000 natural  gas customers  in  805
communities,   and  have  experienced  annual  customer  growth  averaging  8.3%
(including acquisitions) since 1985.  Over the same  period, sales from  natural
gas  have grown an average of 26.8% per year and sales and transportation volume
has grown at an average  of 36.7% per year. UED  obtains most of its gas  supply
from  the  Company's  UEG  business  group.  The  recent  operating  results  of
UtiliCorp's gas operations  are included  as a separate  business segment,  "Gas
Operations", in the Company's consolidated financial statements.
 
                                       6
<PAGE>
ELECTRIC OPERATIONS
 
    The  Company's regulated electric utilities serve 439,000 electric customers
in 418 communities, and have experienced annual customer growth averaging  11.6%
(including  acquisitions) per  year since 1985.  Over the  same period, revenues
from electric sales have grown at an average rate of 12.0% per year and megawatt
hour ("MWH") sales have grown at an  average rate of 15.0% per year. The  recent
operating results of UtiliCorp's regulated electric operations are included as a
separate  business segment, "Electric Operations", in the Company's consolidated
financial statements.  The  aforementioned  data includes  West  Kootenay  Power
Limited   ("WKP"),  the   Company's  Canadian  subsidiary,   which  is  operated
independently of UED. See "The Company--International".
 
    The Company's sales by  jurisdiction for the  twelve months ended  September
30, 1996 are shown below:
 
ELECTRIC OPERATIONS
 
<TABLE>
<CAPTION>
State/Province                                                              Sales        %
- ------------------------------------------------------------------------  ---------  ---------
<S>                                                                       <C>        <C>
Missouri................................................................  $   285.4         48%
Kansas..................................................................      117.7         20
British Columbia........................................................       91.6         15
Colorado................................................................       78.2         13
West Virginia...........................................................       27.8          4
                                                                          ---------  ---------
    Total...............................................................  $   600.7        100%
                                                                          ---------  ---------
                                                                          ---------  ---------
</TABLE>
 
GAS OPERATIONS
 
<TABLE>
<CAPTION>
State                                                                       Sales        %
- ------------------------------------------------------------------------  ---------  ---------
<S>                                                                       <C>        <C>
Minnesota...............................................................  $   152.0         22%
Michigan................................................................      137.4         20
Nebraska................................................................      121.7         18
Iowa....................................................................      106.0         16
Kansas..................................................................       73.7         11
Missouri................................................................       43.8          6
West Virginia...........................................................       22.9          4
Colorado................................................................       22.0          3
                                                                          ---------  ---------
    Total...............................................................  $   679.5        100%
                                                                          ---------  ---------
                                                                          ---------  ---------
</TABLE>
 
UTILICORP ENERGY GROUP
 
    The  Company has  two wholly-owned  subsidiaries that  comprise most  of the
Company's energy-related businesses. These  subsidiaries were organized to  take
advantage of opportunities in the energy related marketplace. The first of these
subsidiaries,  Aquila,  is  a gas  and  electricity marketing,  and  gas supply,
gathering and processing company doing  business throughout most areas of  North
America.  The  second,  UtilCo,  invests  in  non-regulated  electric generating
assets. In addition,  UEG is  responsible for  the management  of the  Company's
regulated  generating  facilities. Aquila  is  included as  a  separate business
segment, "Energy Related  Businesses", in the  Company's consolidated  financial
statements.  UtilCo's operating  results are  primarily included  in "Equity and
Earnings  of  Investments  and  Partnerships"  in  the  Company's   consolidated
financial   statements.  The  operating  results  of  the  regulated  generating
facilities are included in the  separate business segment "Electric  Operations"
in the Company's consolidated financial statements.
 
AQUILA ENERGY CORPORATION
 
    Aquila  was established as a  separate subsidiary of the  Company in 1986 to
take advantage of the gas marketing and transportation opportunities created  by
deregulation  of  the natural  gas industry.  Aquila  has three  business units:
Aquila Energy Marketing Corporation, Aquila Gas Pipeline Corporation ("AGP") and
Aquila Power Corporation ("APC").
 
                                       7
<PAGE>
    Aquila has  a marketing,  supply and  transportation network  consisting  of
relationships  with more  than 1,000  gas producers  and 500  local distribution
companies and end-users throughout the United States, Mexico and Canada. Through
more than 350 transportation agreements, Aquila  has access to more than  17,500
gas  receiving and delivery  points on a  network of 33  pipelines. From 1991 to
1995, Aquila's  annual  gas marketing  volumes  increased from  1,003  to  1,427
million cubic feet per day.
 
    Aquila  Gas Pipeline Corporation  owns and operates  a 3,300-mile intrastate
gas transmission and gathering  network and four  processing plants, located  in
Texas  and Oklahoma, that extract and sell natural gas liquids. AGP also markets
natural gas. In October  1993, Aquila sold, in  an initial public offering,  5.4
million  shares of AGP common stock for approximately $74.6 million representing
about 18%  of the  outstanding stock  of AGP.  The Company  realized a  gain  of
approximately  $47.8 million in  connection with the offering.  On July 1, 1996,
and November 1, 1996  AGP (through AQP  Holdings LP, a  98% owned subsidiary  of
AGP)  completed the acquisition of 15% and 25%, respectively, of the outstanding
capital stock of  Oasis Pipeline  Company ("Oasis")  and related  transportation
rights  from Dow Hydrocarbons  and Resources Inc. ("DHRI")  for a total purchase
price of approximately $132 million. See "Recent Developments -- Oasis  Pipeline
Company."
 
    In  1995, APC  was formed  as a  subsidiary of  Aquila to  take advantage of
opportunities in  wholesale electricity  marketing and  brokering. APC  received
approval  from the Federal Energy Regulatory  Commission ("FERC") on January 11,
1995 to  market  electricity  to  wholesale  customers  such  as  utilities  and
municipalities.  Aquila  expects that  the  electricity marketing  industry will
expand  rapidly   as  electricity   futures  trading   is  developed   and   the
infrastructure  of this industry  segment is established.  For the quarter ended
September 30, 1996, APC's wholesale power sales totaled more than 1,938,000 MWH,
ranking it among the nation's 10 largest power marketers.
 
UTILCO GROUP INC.
 
    UtilCo, formed  in 1986,  participates  in the  ownership and  operation  of
facilities  in the independent and wholesale  power generation market. The goals
of UtilCo are to acquire  ownership positions in electric generation  facilities
and  to  earn rates  of return  appropriate for  the evolving  independent power
industry.  Consistent  with   the  Company's  strategy   to  minimize  risk   by
diversification,   UtilCo  has  invested  in  generation  facilities  which  are
geographically diverse, use  a variety  of fuels, and  use proven  technologies.
Additionally, each project is a producer of competitively priced wholesale power
in  its geographic region  and has a  long-term market for  its output. To date,
UtilCo has made investments in 17 projects located in seven states and  Jamaica,
with  a total net ownership of approximately  320 MW of generating capacity. All
of the projects are in commercial  operation, with the exception of the  Jamaica
project  which the Company expects  to enter commercial operation  by the end of
the year.
 
REGULATED GENERATING ASSETS
 
    UtiliCorp Energy Group also manages the Company's regulated electric  supply
businesses  in the  U.S. The  group principally  oversees the  operations of the
Company's regulated utility  generating plants located  in Colorado, Kansas  and
Missouri. Collectively, the generating plants located in these three states have
the  capacity to  generate 1,580 megawatts  ("MW") (net)  of electricity. During
1995, these  generating  facilities  produced  approximately  5,596,000  MWH  of
electricity,  equaling approximately 70% of all electricity sold domestically by
the Company. UtiliCorp purchased  the remaining 30% of  electricity sold by  the
Company  domestically. Of the electricity generated by the Company domestically,
87% was generated  from coal  fired facilities  and 13%  from oil  or gas  fired
facilities.
 
UTILICORP ENERGY SOLUTIONS
 
    UtiliCorp  Energy Solutions  was formed to  advance the  Company's effort to
become a leading retailer  of energy and energy  related products and  services.
The  Company  believes UES  is positioned  to  provide value-added  products and
services to  its customers.  UES  intends to  provide consumers  with  increased
energy efficiency, home security, appliance servicing and various other consumer
oriented products that should further strengthen and expand UtiliCorp's customer
relationship. In addition, the Company, through several
 
                                       8
<PAGE>
subsidiaries,  has developed alliances and entered into contracts which name UES
entities as the exclusive suppliers of gas in areas that allow competition.  The
operating  results for  the businesses  included in  UES are  not included  as a
separate business segment in the Company's consolidated financial statements.
 
ENERGYONESM
 
    In  May  1995,   UtiliCorp  officially  launched   the  EnergyOneSM   brand.
EnergyOneSM  is a  unifying name  for the products  and services  offered by the
Company. Prior  to  the  EnergyOneSM  brand launch,  the  Company  marketed  its
products  and services  using only the  local utility division  name or separate
subsidiary name.
 
    Most UtiliCorp  products  and  services now  carry  the  EnergyOneSM  brand.
EnergyOneSM  is  an  integral part  of  the  Company's strategy  to  bring brand
awareness and value-added services to the industry and thereby create a platform
for customer  growth outside  existing service  territories. A  sample of  these
value-added services is shown below:
 
<TABLE>
<CAPTION>
Product & Service Category                        Description                      Product & Service Name
- ------------------------------------  ------------------------------------  ------------------------------------
<S>                                   <C>                                   <C>
Supply Solutions                      Assessing customers' energy needs     - AdvisorOneSM Service
                                        and providing customized solutions  -Fuel and Power Management Services
Utility Solutions                     Helping customers design, finance,    - Hot SpotSM Service
                                        build and maintain generating       - Power Services
                                        facilities                          - Special Utility Services
                                                                            - Perfect PowerSM Services
Technology & Equipment Solutions      Designing, developing and installing  - ProfileOneSM Service
                                        emerging and proven technologies    -Productivity & Efficiency Services
                                        to lower customer energy costs      -Environmental Energy Services
</TABLE>
 
    In  addition to developing a new portfolio of products and services in 1995,
the Company invested in its  marketing infrastructure and sales organization  to
support  and sell EnergyOneSM  products and services.  The EnergyOneSM portfolio
includes: appliance and heating, ventilation and air-conditioning  installation,
inspection and repair; new appliance financing; and security packages that allow
consumers  to use  EnergyOneSM to monitor  their homes  for potential intruders,
carbon monoxide  poisoning,  gas  leaks and  service  interruptions.  Management
believes  EnergyOneSM positions the Company to be an industry leader in creating
and providing consumer  services to  make each  consumer's home  safer and  more
energy efficient.
 
    Since  the launch of the EnergyOneSM brand in 1995, the Company, through its
subsidiaries, has entered  into gas supply  contracts with commercial  customers
such  as  Ground Round  Restaurants, Applebee's  International, Apple  South and
Service Merchandise. UtiliCorp subsidiaries,  under the EnergyOneSM brand,  have
developed   alliances  with  The  Retailers  Bakery  Association,  The  National
Association  of   Housing   Cooperatives,  The   Asian-American   Hotel   Owners
Association,    The   Regional   Energy   Management   Coalition   (representing
approximately 100  Southern  California  school  districts)  and  others.  These
contracts  and  alliances allow  the  Company to  be  the exclusive  provider of
natural gas in areas which allow competition, as well as allowing the Company to
be the electricity provider of  choice as deregulation increases competition  in
the electric industry.
 
INTERNATIONAL
 
    The  Company's international operations are managed separately from UED, UEG
and UES and include  electric utility operations in  Australia, New Zealand  and
Canada,  as well as gas marketing in the United Kingdom. UtiliCorp believes that
its experience in  foreign utility operations  will enable the  Company to  more
effectively  manage  increased  competition  in its  domestic  gas  and electric
operations.
 
    In September, 1995, UtiliCorp  purchased a 49.9%  interest in United  Energy
for  approximately  $257.9 million.  United  Energy is  one  of the  three major
electric distribution utilities  serving the  metropolitan Melbourne,  Australia
area. United Energy's service territory includes 533,000 customers.
 
                                       9
<PAGE>
    During   1995,  UNZ  purchased  a  27.5%   ownership  interest  in  PNZ  for
approximately $107.1 million, which was subsequently increased to 29.4%  through
various  purchases in  1996. PNZ serves  216,000 customers in  the Auckland, New
Zealand metropolitan  area  and  is the  second  largest  electric  distribution
utility  in  New Zealand.  UNZ  also owns  a 39%  interest  in WEL,  an electric
distribution utility  serving 65,000  customers  in the  Waikato region  of  New
Zealand.
 
    UtiliCorp   operates  an  electric   utility  serving  approximately  82,000
customers in British Columbia, Canada  through WKP. WKP generates  approximately
50%  of  its  electricity  needs  from  hydroelectric  power  and  purchases the
remainder. WKP has some of the lowest  generation costs in North America due  to
the efficiency of hydroelectric power.
 
    The  Company has various natural gas  marketing operations that sell natural
gas  to  wholesale  and  industrial  customers  in  the  United  Kingdom.  These
operations  consist of United  Gas Limited and joint  ventures with two regional
electric companies.
 
COMPETITIVE POSITION
 
    UtiliCorp believes  that it  is  well-positioned to  take advantage  of  the
opportunities  presented by  an increasingly deregulated  and competitive market
for the generation and sale of electricity and by the convergence of the markets
for gas and electricity into a market for energy and energy services.  UtiliCorp
believes that its competitive advantages include:
 
    PRICE  POSITION.   The Company believes  that, overall, its  natural gas and
electricity is competitively priced within the geographic regions it serves.  In
the  year ended December 31, 1995, the Company's average billed bundled gas sale
per thousand cubic feet was $4.74 per residential customer, $4.13 per commercial
customer and $3.56 per industrial customer. In the year ended December 31, 1995,
the Company's average billed electric sales per kilowatt hour was 6.9 CENTS  per
residential  customer,  6.0  CENTS per  commercial  customer and  4.0  CENTS per
industrial customer.
 
    DIVERSE ELECTRIC  GENERATION FUEL  MIX.   Approximately 69%  of  UtiliCorp's
electric  generating  capacity  is coal-fired.  In  1995,  the fuel  mix  of the
remaining generation was 21% hydro (all located in Canada) and 10% gas and  oil.
The  Company  purchased  approximately  39% of  its  North  American electricity
requirements in 1995.  UtiliCorp neither  owns nor  operates nuclear  generating
facilities.
 
    DIVERSITY  OF OPERATIONS AND  CUSTOMERS SERVED.  In  the year ended December
31, 1995,  North  American  gas  and electric  sales  were  derived  from  eight
different  states  and one  Canadian  province, with  no  more than  27%  of the
combined gas and electric  sales from a single  jurisdiction. In the year  ended
December  31,  1995,  UtiliCorp's gas  and  electric utility  sales  were $616.8
million and $577.7 million, respectively. In  the year ended December 31,  1995,
sales  from  gas  operations  were  derived  from  residential,  commercial  and
industrial/other customers,  59%,  25%  and 16%,  respectively  and  sales  from
electric    operations   were   derived   from   residential,   commercial   and
industrial/other customers, 44%, 28% and 28%, respectively.
 
    GAS AND ELECTRICITY MARKETING CAPABILITY.  The Company believes that many of
the skills necessary to compete in the energy market of the future reside in the
marketing and brokering  of gas  and electricity.  Aquila is  a significant  and
profitable  gas marketer and in 1995 had  gas marketing volumes of 1,427 million
cubic feet per day. In 1995, Aquila formed an electricity marketing  subsidiary,
APC,  allowing  the  Company to  provide  both  natural gas  and  electric power
commodity services  to  its wholesale  customers  from an  integrated  wholesale
marketing perspective.
 
    INNOVATIVE  MANAGEMENT.   UtiliCorp  has  assembled a  management  team with
significant experience both inside and outside the traditional electric and  gas
utility industry, including telecommunications, airlines and consumer products.
 
STRATEGY
 
    The  domestic electric industry has become substantially more competitive as
federal and  state regulators  and  legislators continue  to take  steps  toward
deregulation.  With the passage of the Public Utility Regulatory Policies Act of
1978 and the National Energy Policy  Act of 1992, the electric utility  industry
has  already experienced a  significant increase in the  level of competition in
the market for the generation and
 
                                       10
<PAGE>
sale of electricity. In  addition, in 1996, the  FERC issued Order 888,  dealing
primarily with open access to transmission lines and recovery of stranded costs,
which  the Company  believes will further  increase competition  in the electric
industry.
 
    The competitive forces  affecting the domestic  electric industry have  also
affected  the domestic gas industry. In 1992,  FERC Order 636 shifted gas supply
responsibilities from  traditional  pipeline  company  sources  to  distribution
utilities and allowed customers to bypass a gas distribution utility's system by
directly  connecting  to  a  transportation  pipeline.  FERC  Order  636 allowed
customers to negotiate separately for their supplies of gas.
 
    To address future  competitive challenges, UtiliCorp  began, over two  years
ago, to review its competitive position and opportunities. The Company assembled
a  team  of  approximately  100  employees  to  assist  in  the  development  of
UtiliCorp's strategy to become a  multinational provider of energy solutions  to
its customers. Key elements of this strategy include:
 
    ALIGNMENT    OF    BUSINESSES    TO   ADDRESS    A    CHANGING   COMPETITIVE
ENVIRONMENT.  UtiliCorp realigned its businesses during 1995 into four  business
groups, UED, Power Services, Energy Resources and Marketing Services in order to
more  efficiently and effectively serve its markets and customers. Recently, the
Company combined Power Services and  Energy Resources into UEG and  transitioned
Marketing  Services into a system-wide  enterprise support function. The Company
has also realigned its non-regulated retail activities under UES.
 
    CONTINUED OPERATIONAL EXCELLENCE.  In  1995, the Company began  centralizing
business  support  functions previously  performed  separately by  the operating
divisions. More than 200 employees in support functions moved to Kansas City and
almost 2,000 employees  are doing  jobs today that  are significantly  different
than  a year  ago. Management  continues to  focus closely  on the  overall cost
position of the Company.
 
    UNIFYING ENERGYONESM  BRAND.   In 1995,  the Company  introduced a  unifying
brand  name, EnergyOneSM, under which it  is implementing its strategy to market
products and  services  to  consumers  nationwide.  EnergyOneSM  was  the  first
national  brand in  the electric and  gas industries. The  Company believes that
this strategy will improve the Company's already strong competitive position  in
an increasingly deregulated environment.
 
    PURSUIT  AND  EXPLOITATION  OF NEW  TECHNOLOGY.   UtiliCorp  is  seeking new
technologies to complement and enhance its portfolio of energy related  products
and  services. Examples include  the Company's partnership  with Novell, Inc. to
develop certain technologies and products to better manage energy consumption in
home and  business environments  and the  Company's recently  signed three  year
licensing  agreement with Adaptive Networks, Inc. that provides UtiliCorp access
to advanced powerline communications technologies.
 
    EMPLOYEE OWNERSHIP  AND  COMMITMENT.   Approximately  95% of  the  Company's
employees  own  stock  in  UtiliCorp.  UtiliCorp  management  and  employees own
approximately 12% of the Company's stock  and a significant component of  senior
management's  compensation  is  related  to  the  financial  performance  of the
Company. Management  believes that  employee-owners are  more likely  to  create
value  for customers and shareholders as a  result of their personal interest in
the success of the Company.
 
    MERGERS AND ACQUISITIONS.  Growth through mergers and acquisitions has  been
a  major part  of UtiliCorp's strategy  for more  than a decade.  With over $1.6
billion of investments, mergers or acquisitions completed, the Company  believes
it has become a more capable and diversified energy provider. Several years ago,
UtiliCorp expanded its growth strategy to include foreign markets, concentrating
on  opportunities in English-speaking countries  such as Australia, New Zealand,
the United Kingdom, and Canada.
 
                                       11
<PAGE>
CERTAIN FORWARD-LOOKING INFORMATION
 
    This  Prospectus contains certain forward-looking statements which are based
on various  assumptions. These  assumptions involve  judgments with  respect  to
various  factors, all of  which are difficult  to predict and  many of which are
beyond the control of the Company. Accordingly, while the Company believes  that
such assumptions are reasonable, there can be no assurance that such assumptions
will  approximate actual experience  and actual results  could differ materially
from those predicted. The following are  important factors that could cause  the
Company's  actual  results to  differ  materially from  present  expectations or
beliefs:  (a)  future  economic  conditions   in  the  regional,  national   and
international markets in which the Company competes; (b) weather conditions; (c)
financial  market conditions, including, but not limited to, changes in interest
rates; (d) changing competition, including, but not limited to, the deregulation
of the United States electric utility industry and the entry of new competitors;
(e) the ability to carry out marketing and sales plans; (f) the ability to enter
new markets successfully and capitalize on growth opportunities in non-regulated
businesses; and (g)  adverse changes  in applicable laws,  regulations or  rules
governing environmental, tax or accounting matters.
 
                              RECENT DEVELOPMENTS
 
TERMINATION OF MERGER AGREEMENT
 
    On September 17, 1996, Kansas City Power & Light Company ("KCPL") terminated
the  Amended and Restated  Agreement and Plan of  Merger (the "Agreement") among
KCPL, KC Merger Sub,  Inc., the Company  and KC United  Corp., which would  have
provided for the merger of the Company and KCPL.
 
    Since  KCPL's shareholders did  not approve the merger  between KCPL and the
Company, KCPL was required to pay  the Company $5 million. The Company  received
this  termination  payment  on  September  19,  1996.  In  connection  with  the
termination of the Agreement the Company recorded against third quarter earnings
a pre-tax charge of approximately $11.0 million ($6.8 million after-tax or  $.14
per fully diluted common share), net of the termination fee payment.
 
ISSUANCE OF SENIOR NOTES
 
    On  October 23,  1996, the Company  issued $100 million  of unsecured Senior
Notes ("Senior Notes"). The Senior Notes bear an interest rate of 6.7% and  will
mature  on October 15,  2006. The proceeds  of the issuance  were used to reduce
short-term debt incurred for acquisitions, construction and debt retirements and
for general corporate purposes.
 
OASIS PIPELINE COMPANY
 
    On July 1, 1996,  AGP (through AQP  Holdings LP, a  98% owned subsidiary  of
AGP) acquired 15% of the outstanding capital stock of Oasis Pipeline Company and
related  transportation rights  from DHRI  for approximately  $48 million. Oasis
consists of an  approximately 600-mile pipeline  system and is  in proximity  to
many  of  AQP's existing  gathering systems.  On November  1, 1996  AGP acquired
another  25%  of  Oasis'  common  stock  for  approximately  $84  million.   The
transportation  rights related to  the 40% capital  stock acquisitions currently
amount to  approximately 320  million  cubic feet  per  day of  firm  intrastate
transportation  from  the Waha  hub  (located in  west  Texas) to  the  Katy hub
(located in east Texas) and include  the opportunity to utilize excess  capacity
on  an  interruptible basis.  In  addition, AGP  and  DHRI have  entered  into a
long-term gas supply  agreement whereby AGP  will supply DHRI  with 100  million
British  thermal units per day  of gas supply in the  Katy, Texas area at market
rates.
 
SHAREHOLDER RIGHTS PLAN
 
    On November  6,  1996, the  Board  of Directors  of  the Company  adopted  a
Shareholder  Rights  Plan pursuant  to  which, subject  to  regulatory approval,
holders of Common Stock  outstanding on December 31,  1996 or issued  thereafter
will  receive one preference share purchase  right attributable to each share of
UtiliCorp United  Inc.  Common  Stock.  See  "Description  of  Common  Stock  --
Shareholder Rights Plan".
 
                                       12
<PAGE>
RECENT OPERATING RESULTS
 
    On  November 7, 1996 the Company announced  that for the third quarter ended
September 30, 1996, its earnings available for common shares were $13.6 million.
Earnings available for  common shares in  the third quarter  of 1995 were  $32.4
million.  Excluding each period's significant  non-recurring items, earnings for
the 1996 quarter compared  to the 1995 quarter  were $20.4 million versus  $18.2
million.
 
    The  third  quarter  1996 results  include  an $11.0  million  pre-tax ($6.8
million after-tax) charge against earnings  related to the Company's  terminated
merger  with KCPL. The after-tax effect  of this change reduced primary earnings
per common share  by $.15.  Results for the  1995 third  quarter were  increased
$15.9  million ($.36 per common share) to reflect an accounting change offset in
part by a $1.7 million ($.04 per  common share) decrease to reflect the sale  of
the Company's oil and gas production assets.
 
    Primary  earnings per common share for  the 1996 quarter were $.29, compared
to $.72 for the 1995 quarter. Excluding each period's significant  non-recurring
items, the 1996 quarter primary earnings per common share were $.44, compared to
$.40 for the 1995 quarter.
 
                     USE OF PROCEEDS AND FINANCING PROGRAM
 
    The  net proceeds  of this  offering will  be used  to reduce  the Company's
outstanding short-term  debt incurred  for acquisitions,  construction and  debt
retirements and for general corporate purposes.
 
    At  September 30,  1996, the  Company had  outstanding short-term borrowings
(excluding current maturities) of approximately  $340.9 million with a  weighted
average interest cost of 5.44%.
 
    The  Company's utility  construction expenditures  amounted to approximately
$109.4  million  for  the  year  ended  December  31,  1995.  Expenditures   for
non-regulated   generating  assets,  energy  related  businesses,  international
businesses and other purposes totalled approximately $730.0 million for the year
ended December 31, 1995.  Through September 30, 1996,  the Company had  expended
approximately   $82.5   million  for   utility   construction  in   addition  to
approximately $147.0 million for investments in energy related and international
businesses and other purposes. The  Company anticipates that cash provided  from
operating  activities will be sufficient to  meet total cash requirements during
the  1997-2000  forecast  period,   excluding  requirements  for   acquisitions,
non-regulated investments and debt retirements.
 
    As  discussed under  "The Company",  UtiliCorp is  actively seeking  to make
investments in and acquisitions of utility and other energy related  properties.
Such  acquisitions and  investments, if  made, may  require additional permanent
financings. The nature and amount of such financings will depend on, among other
things, market conditions at the time of the financings.
 
                                       13
<PAGE>
                     COMMON STOCK DIVIDENDS AND PRICE RANGE
 
    Cash  dividends on the Common Stock of  the Company and its predecessor have
been paid each year since 1939.
 
    The current policy of the Board of  Directors of the Company (the "Board  of
Directors")  is to pay cash dividends on  the Common Stock on a quarterly basis.
Future cash dividends  will necessarily be  dependent upon the  policies of  the
Board  of Directors  and the Company's  earnings, financial  condition and other
factors. See "Description  of Common  Stock" for certain  restrictions upon  the
payment of cash dividends.
 
    The  Company has a Dividend Reinvestment and Common Stock Purchase Plan (the
"Plan") pursuant to which shareholders  may automatically reinvest Common  Stock
cash  dividends  in shares  of the  Company's Common  Stock. The  Plan currently
provides for  reinvestment at  95% of  applicable market  prices. Investors  and
existing  shareholders may make optional cash  purchases of Common Stock at 100%
of applicable market prices in amounts up to $10,000 per month.
 
    The graph below  illustrates the  cash dividends  per common  share paid  to
shareholders since 1984.
 
                       UTILICORP UNITED DIVIDEND HISTORY
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
           UTILICORP UNITED
<S>        <C>
           Dividend History
1984                  $0.64
1985                  $0.77
1986                  $0.87
1987                  $0.93
1988                  $1.04
1989                  $1.42
1990                  $1.46
1991                  $1.54
1992                  $1.60
1993                  $1.62
1994                  $1.70
1995                  $1.72
1996                  $1.76
</TABLE>
 
- ------------
*   On November 6, 1996, the Company's Board of Directors declared a quarterly
    dividend of $.44 to be paid on December 12, 1996 to shareholders of record
    on November 27, 1996.
 
                                       14
<PAGE>
    UtiliCorp's  Common Stock  is listed  on the  New York,  Pacific and Toronto
Stock Exchanges and is traded under the symbol UCU. The reported price range  of
the  Common Stock  on the  composite tape  and dividends  paid are  shown in the
following table for the periods indicated.
 
<TABLE>
<CAPTION>
                                                                                               SALE PRICES
                                                              QUARTERLY CASH                -----------------
                                                                 DIVIDENDS              HIGH                   LOW
                                                              ---------------         -------                 ------
<S>                                                           <C>              <C>          <C>        <C>        <C>
1994:
  First Quarter.............................................     $     .42      $      31   7/8        $      28  3/4
  Second Quarter............................................           .42             31   1/2               27  3/4
  Third Quarter.............................................           .43             29   3/4               25  7/8
  Fourth Quarter............................................           .43             27   7/8               25  1/8
                                                                     -----
                                                                 $    1.70
                                                                     -----
                                                                     -----
1995:
  First Quarter.............................................     $     .43      $      29   1/2        $      26  3/8
  Second Quarter............................................           .43             29                     27  1/4
  Third Quarter.............................................           .43             28   1/2               26  5/8
  Fourth Quarter............................................           .43             29   5/8               27  1/2
                                                                     -----
                                                                 $    1.72
                                                                     -----
                                                                     -----
1996:
  First Quarter.............................................     $     .44      $      30   1/2        $      28  1/4
  Second Quarter............................................           .44             29   1/8               25  3/4
  Third Quarter.............................................           .44             29   1/8               26  1/2
  Fourth Quarter (through November 20, 1996)*...............           .44             28   1/4               27
                                                                     -----
                                                                 $    1.76
                                                                     -----
                                                                     -----
</TABLE>
 
- ------------
 
*   Reflects dividend payable on December 12, 1996 to shareholders of record  on
    November 27, 1996.
 
    For  a recent closing sale price of the Common Stock, as reported on the New
York Stock Exchange, see the cover page hereof.
 
    On November 19, 1996, the Company had 41,211 common shareholders of record.
 
                                       15
<PAGE>
                                 CAPITALIZATION
 
    The  following table sets forth the  unaudited capitalization of the Company
as of September 30, 1996, and adjusted at that date to reflect: (a) the sale  of
the  5,250,000 shares of Common Stock offered pursuant to the offering (assuming
the Underwriters' over-allotment option is  not exercised), (b) the issuance  of
$100  million  Senior Notes  completed on  October 23,  1996 as  discussed under
"Recent Developments", (c) the acquisition of  a 25% interest in Oasis  Pipeline
on  November  1,  1996 as  described  under  "Recent Developments"  and  (d) the
application of  the  net  proceeds  as described  under  "Use  of  Proceeds  and
Financing Program."
 
<TABLE>
<CAPTION>
                                                                                  AS OF SEPTEMBER 30, 1996*
                                                                            --------------------------------------
                                                                                               AS ADJUSTED
                                                                                        --------------------------
                                                                                                          %
                                                                              ACTUAL     AMOUNT    CAPITALIZATION
                                                                            ----------  ---------  ---------------
                                                                                (IN MILLIONS)
<S>                                                                         <C>         <C>        <C>
First Mortgage Bonds......................................................  $     20.6  $    20.6
Pollution Control Bonds...................................................        12.3       12.3
Senior Notes..............................................................       912.5    1,012.5
Convertible Subordinated Debentures.......................................         7.5        7.5
Secured Debentures........................................................        68.7       68.7
Other Obligations (1).....................................................       351.3      351.3
                                                                            ----------  ---------
  Total Long-Term Debt....................................................  $  1,372.9  $ 1,472.9            54%
                                                                            ----------  ---------
Preference Stock, without par value, authorized 10,000,000 shares,
 outstanding:.............................................................
  Not mandatorily redeemable, 1,000,000 shares $2.05 Series...............        25.0       25.0             1%
                                                                            ----------  ---------
Preferred Stock of Subsidiary.............................................          .4         .4        --
                                                                            ----------  ---------
Company-Obligated Mandatorily Redeemable, Preferred Securities of a
 Partnership..............................................................       100.0      100.0             4%
                                                                            ----------  ---------
Common Shareholders' Equity
  Common Stock, par value $1 per share, authorized 100,000,000 shares,
   outstanding 47,047,376 and 52,297,376 shares...........................        47.0       52.3
  Class A Common Stock, par value $1 per share, authorized 20,000,000
   shares, none outstanding...............................................          --         --
  Premium on Capital Stock................................................       830.9      965.9
  Retained Earnings.......................................................       120.8      120.8
  Treasury Stock, at cost.................................................       (11.0)     (11.0)
  Translation Adjustment..................................................        (4.0)      (4.0)
                                                                            ----------  ---------
    Total Common Shareholders' Equity.....................................       983.7    1,124.0            41%
                                                                            ----------  ---------         -----
      Total Capitalization................................................  $  2,482.0  $ 2,722.3           100%
                                                                            ----------  ---------         -----
                                                                            ----------  ---------         -----
Short-Term Debt, Including Current Maturities.............................  $    356.0  $   199.7
                                                                            ----------  ---------
                                                                            ----------  ---------
</TABLE>
 
- ------------
*   Unaudited
 
(1) Includes $237.3 million of obligations denominated in Australian dollars and
    $73.4 million of obligations denominated in New Zealand dollars.
 
                                       16
<PAGE>
                         SELECTED FINANCIAL INFORMATION
                 (DOLLARS IN MILLIONS EXCEPT PER SHARE AMOUNTS)
 
    The  following  selected  financial  data of  UtiliCorp  should  be  read in
conjunction with  the financial  statements and  notes thereto  incorporated  by
reference into this Prospectus and in conjunction with the "Recent Developments"
section.
 
<TABLE>
<CAPTION>
                                                                        YEARS ENDED DECEMBER 31,
                                                          -----------------------------------------------------
                                                            1995       1994       1993       1992       1991
                                                          ---------  ---------  ---------  ---------  ---------
<S>                                                       <C>        <C>        <C>        <C>        <C>
INCOME STATEMENT DATA:
  Sales (1).............................................  $ 2,798.5  $ 2,398.1  $ 2,746.1  $ 2,339.0  $ 1,726.2
  Income from Operations (2)(3).........................      225.1      228.0      144.0      165.4      192.7
  Net Income (4)........................................       79.8       94.4       86.4       52.9       77.6
  Earnings Available for Common Shares..................       77.7       91.4       79.5       46.0       69.8
  Primary Earnings Per Common Share.....................       1.72       2.08       1.95       1.32       2.37
  Fully Diluted Earnings Per Common Share...............       1.71       2.06       1.92       1.31       2.27
  Cash Dividends Per Common Share.......................       1.72       1.70       1.62       1.60       1.54
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                           TWELVE MONTHS ENDED
                                                                                           SEPTEMBER 30, 1996*
                                                                                         ------------------------
                                                                                         PRO FORMA (5)   ACTUAL
                                                                                         -------------  ---------
<S>                                                                                      <C>            <C>
  Sales................................................................................    $ 3,606.0    $ 3,606.0
  Income from Operations (6)...........................................................        181.6        181.6
  Net Income (7).......................................................................         90.8         85.3
  Earnings Available for Common Shares.................................................         88.7         83.2
  Primary Earnings Per Common Share....................................................         1.72         1.79
  Fully Diluted Earnings Per Common Share..............................................         1.71         1.79
  Cash Dividends Per Common Share......................................................         1.75         1.75
</TABLE>
 
<TABLE>
<CAPTION>
                                 AS OF SEPTEMBER 30, 1996*
                                 -------------------------                    AS OF DECEMBER 31
                                  AS ADJUSTED               -----------------------------------------------------
                                      (8)         ACTUAL      1995       1994       1993       1992       1991
                                 --------------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                              <C>             <C>        <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
  Total Assets.................    $  4,045.8    $ 3,961.8  $ 3,885.9  $ 3,111.1  $ 2,850.5  $ 2,552.8  $ 2,387.3
  Short-Term Debt (Including
   Current Maturities).........         199.7        356.0      303.7      321.2       71.8      236.8      114.5
  Long-Term Debt...............       1,472.9      1,372.9    1,355.4      976.9    1,009.7      890.8      928.1
  Preference and Preferred
   Stock (9)...................         125.4        125.4      125.4       25.4       83.9       95.1       97.1
  Common Shareholders'
   Equity......................       1,124.0        983.7      946.3      906.8      851.7      661.1      660.7
  Book Value Per Common
   Share.......................    $    21.49    $   20.91  $   20.59  $   20.24  $   20.27  $   18.66  $   19.18
</TABLE>
 
- ------------------------
*   Unaudited
 
(1) In  1995, the Company changed its  method of accounting for domestic natural
    gas  trading  operations  to  the  mark-to-market  method.  This  change  in
    accounting  increased sales and income from operations by $29.8 million, net
    income by $18.3 million ($.40 per  fully diluted share) and total assets  by
    $201.9 million. This change in accounting has been reflected from January 1,
    1995. The effect on prior periods was not material.
 
(2) In 1993, Aquila recorded a $69.8 million pre-tax restructuring charge ($45.0
    million  after-tax) against earnings ($1.02 per fully diluted share) related
    to a change in strategic direction.
 
(3) In 1995, the Company recorded a $34.6 million pre-tax charge ($19.6  million
    after-tax, or $.43 per fully diluted share) related to impaired assets.
 
                                       17
<PAGE>
(4) In 1993, Aquila sold 18% of AGP in an initial public offering resulting in a
    non-taxable gain of $47.8 million ($1.08 per fully diluted share).
 
(5) The  pro forma  financial data  give effect  to: (a)  the sale  of 5,250,000
    shares of  Common  Stock offered  pursuant  to the  offering  (assuming  the
    Underwriters'   over-allotment  option   is  not  exercised)   and  (b)  the
    application of the  net proceeds  as described  under "Use  of Proceeds  and
    Financing  Program"  as though  they had  occurred at  the beginning  of the
    period indicated. The pro forma income statement impact for the issuance  of
    $100  million of Senior Notes as  described in the "Recent Developments" has
    been excluded due to immateriality.
 
(6) In the third quarter of 1996, the Company expensed $11.0 million of deferred
    merger costs. See "Recent Developments".
 
(7) In 1996, the  Company recorded  an $11.8  million after-tax  gain ($.25  per
    fully diluted share) primarily from the effects of a sales lease transaction
    at a UtilCo partnership.
 
(8) The as adjusted financial data give effect to: (a) the sale of the 5,250,000
    shares  of  Common  Stock offered  pursuant  to the  offering  (assuming the
    Underwriters' over-allotment option is  not exercised); (b) the  application
    of  the  net proceeds  as  described under  "Use  of Proceeds  and Financing
    Program"; (c) the pro  forma balance sheet impact  for the issuance of  $100
    million  of Senior Notes as described  in the "Recent Developments"; and (d)
    the acquisition of an  additional 25% ownership  interest in Oasis  Pipeline
    Company as described in "Recent Developments".
 
(9) Includes  $100 million of Company-obligated mandatorily redeemable preferred
    securities of a partnership, $25 million preference stock and  approximately
    $400,000 preferred stock of a Company subsidiary.
 
                                       18
<PAGE>
                          DESCRIPTION OF COMMON STOCK
 
    The  following  description of  the  terms of  the  Common Stock  sets forth
general terms and provisions of the Company's Common Stock and does not  purport
to  be complete and is subject to and  qualified in its entirety by reference to
the Certificate of Incorporation of the Company, as amended (the "Certificate of
Incorporation"), and the Company's Michigan Gas Utilities Indenture, dated as of
July 1, 1951, as  amended and supplemented (the  "MGU Indenture"), securing  the
first  mortgage bonds  issued by  Michigan Gas  Utilities Company  under the MGU
Indenture and  assumed by  the Company  in connection  with its  acquisition  of
Michigan Gas Utilities Company.
 
    The  total number of shares of capital stock which the Company has authority
to issue  is 130,000,000  shares,  consisting of  100,000,000 shares  of  Common
Stock,  par value $1  per share, 10,000,000 shares  of Preference Stock, without
par value, and 20,000,000 shares of Class A Common Stock, par value $1 per share
(the "Class A Common Stock").
 
DIVIDEND RIGHTS AND LIMITATIONS
 
    Subject to  the  limitations  referred  to below  and  to  the  preferential
dividend  rights of the Company's Preference Stock, dividends may be declared on
the Common Stock out of funds legally available therefor.
 
    Cash dividends  on  and  acquisition  of the  Company's  capital  stock  are
restricted  by provisions of the Company's  MGU Indenture, and by the Preference
Stock provisions of the Certificate of Incorporation. Under the most restrictive
of these provisions, contained in the MGU Indenture, the Company may not declare
or pay any  dividend (other than  a dividend  payable in shares  of its  capital
stock),  whether in cash, stock or otherwise, or make any other distribution, on
or with respect  to any class  of its  capital stock, or  purchase or  otherwise
acquire  any shares of  any class of  its capital stock  if, after giving effect
thereto, the sum of (i) the aggregate  amount of all dividends declared and  all
other distributions made (other than dividends declared or distributions made in
shares  of its  capital stock)  on shares  of its  capital stock,  of any class,
subsequent to December 31,  1984, plus (ii)  the excess, if  any, of the  amount
applied  to or set apart for the purchase  or other acquisition of any shares of
its capital stock,  of any  class, subsequent to  December 31,  1984, over  such
amounts  as shall have been received by the  Company as the net cash proceeds of
sales of shares of its capital stock,  of any class, subsequent to December  31,
1984,  would exceed the  sum of the net  income of the  Company since January 1,
1985, plus $50 million. In addition, the Company may not declare such  dividends
unless  it  maintains a  tangible net  worth of  at least  $250 million  and the
aggregate principal amount of its  outstanding indebtedness does not exceed  70%
of its capitalization. None of the Company's retained earnings was restricted as
to payment of cash dividends on its capital stock as of September 30, 1996.
 
VOTING RIGHTS
 
    The  holders of Common Stock are entitled to one vote for each share held of
record, and are entitled  under the Certificate  of Incorporation to  cumulative
voting  in the  election of  directors. The Board  of Directors  is divided into
three classes and each  year one class  is elected to  serve a three-year  term.
Such  classification increases  the number  of votes  necessary under cumulative
voting to elect a director.
 
    If dividends on the Preference Stock  (which are cumulative) are in  default
in an amount equal to one and one-half times an annual dividend or more, holders
of the Preference Stock, voting separately as a class, are entitled to elect two
directors until all dividend arrearages have been paid.
 
    The  consent  of the  holders  of either  a  majority or  two-thirds  of the
outstanding shares of Preference Stock (depending on the matter) is required  to
effect  such matters as the creation or authorization of any stock ranking prior
thereto or  on  a  parity  therewith,  the  creation  of  authorization  of  any
securities convertible into shares of stock ranking prior thereto or on a parity
therewith, or any increase in the total authorized amount of Preference Stock or
of any class of stock ranking prior thereto or on a parity therewith.
 
CHANGE IN CONTROL AND BUSINESS TRANSACTION PROVISIONS
 
    The  Certificate  of Incorporation  (i) provides  for the  classification of
directors, with three-year staggered terms, and a requirement of an  affirmative
vote    of   80%    of   the   outstanding    shares   of    Common   Stock   to
 
                                       19
<PAGE>
remove the entire Board of Directors;  (ii) requires an affirmative vote of  80%
of  the outstanding shares of Common Stock (or the approval of two-thirds of the
directors) to change  the provisions of  the Bylaws relating  to the  classified
Board  of  Directors; and  (iii) requires  the  affirmative vote  of 80%  of the
outstanding shares of Common Stock to approve certain Business Transactions  (as
defined  therein) with  a Related Person  (defined below), unless  approved by a
majority vote  of the  Continuing Directors  (as defined  therein) or  unless  a
certain  minimum price requirement is met.  Such provisions may have significant
effects on the ability of stockholders of the Company to change the  composition
of an incumbent Board of Directors or to benefit from certain transactions which
are opposed by an incumbent Board of Directors.
 
    The  term "Related Person" is defined in the Certificate of Incorporation to
include a security holder who owns 20% or more of the outstanding shares of  the
Common  Stock. The above provisions dealing with Business Transactions involving
the Company and a Related Person may discriminate against a security holder  who
becomes a Related Person by reason of ownership of such amount of Common Stock.
 
CLASS A COMMON STOCK
 
    The  Board of  Directors, without  further action  by the  stockholders, may
issue Class A  Common Stock from  time to time,  in one or  more series, and  by
resolution  may fix the voting powers (full or limited, or no voting powers) and
such designations, preferences  and relative, participating,  optional or  other
special  rights, and qualifications, limitations or  restrictions of the Class A
Common Stock of each such series,  including (a) the distinctive designation  of
each  series and the number of shares  that will constitute each series, (b) the
dividend rate, or manner of determination of the dividend, for such series,  (c)
the  price at which, and the terms and conditions upon which, the shares of such
series may be made redeemable, (d)  the purchase or sinking fund provisions,  if
any,  for  the  purchase  or  redemption  of  shares  of  such  series,  (e) the
preferential amount payable upon each share of  such series in the event of  the
liquidation, dissolution or winding up of the Company, (f) the voting rights, if
any,  of shares of such series, (g) the terms and conditions, if any, upon which
shares of such series may be converted into shares of other classes or series of
shares of the Company or other  securities, (h) the relative rights of  priority
of  each series of Class A Common Stock  as to dividends and assets, and (i) any
other special rights, or powers,  preferences and privileges, and  qualification
or limitation thereof.
 
    The Board of Directors may issue a series with rights more or less favorable
with respect to dividends, liquidation and voting than those held by the holders
of  the  Common  Stock.  The  Class  A Common  Stock  may  also  be  used  as an
anti-takeover device by the Company since the Class A Common Stock may be issued
with "super voting" rights and placed in the control of parties friendly to  the
current management, thus prolonging management's control of the Company. The New
York  Stock Exchange  has in effect  a rule  which restricts the  ability of the
Company to issue Class A Common Stock  with such super voting rights. There  are
no  shares of Class A Common Stock issued  or outstanding on the date hereof and
the Company has no present intention of issuing such shares.
 
SHAREHOLDER RIGHTS PLAN
 
    The Company has adopted, subject to obtaining certain regulatory  approvals,
a  Shareholder Rights Plan pursuant to which holders of Common Stock outstanding
on December 31, 1996 or issued thereafter have been granted one preference share
purchase right  (a "Right")  attributable to  each share  of Common  Stock.  The
following  description  of the  Rights is  not  intended to  be complete  and is
qualified in its  entirety by  reference to the  form of  Rights Agreement  (the
"Rights  Agreement") between the Company and  First Chicago Trust Company of New
York incorporated by reference  in this Prospectus.  Certain of the  capitalized
terms  used in  the following  description have  the meanings  set forth  in the
Rights Agreement.
 
    Each Right, when it becomes exercisable as described below, will entitle the
registered holder to purchase one one-thousandth (1/1000th) of a share of Series
A Participating Cumulative Preference  Stock of the Company,  no par value  (the
"Preference Stock"), at a purchase price of $115, subject to certain adjustments
and  other specified conditions. Initially, the  Rights will be evidenced by the
certificates of Common  Stock of  the Company, registered  in the  names of  the
holders thereof and will be transferred with and only with the Common Stock.
 
                                       20
<PAGE>
    The  Rights become exercisable  upon the occurrence  of a Distribution Date,
which is  defined in  the  Rights Agreement  as the  earlier  of (i)  the  tenth
business  day (or such later  date as the Board of  Directors of the Company may
from time  to  time fix  by  resolution) after  the  date on  which  any  Person
commences a tender or exchange offer which, if consummated, would result in such
Person's  acquiring beneficial  ownership of  more than  15% of  the outstanding
Common Stock (such  Person being  called an  "Acquiring Person"),  and (ii)  the
tenth  business day after the  first date of public  announcement by the Company
that a Person has become an Acquiring Person (the "Flip-in Date") or such  other
date  as the  Board of Directors  of the  Company may from  time to  time fix by
resolution adopted  prior to  the  Flip-in Date.  The definition  of  "Acquiring
Person"  excludes certain persons, including certain persons which inadvertently
acquire beneficial ownership of  more than 15% of  the outstanding Common  Stock
provided  that such  Person promptly agrees  to divest and  does promptly divest
sufficient shares  of  Common  Stock  to  reduce  such  Person's  percentage  of
beneficial ownership below 15%.
 
    In  the event  that a  Flip-in Date  occurs, each  Right (other  than Rights
beneficially owned  by  the  Acquiring  Person or  any  Affiliate  or  Associate
thereof,  which Rights shall become void) shall constitute the right to purchase
from the Company that number of shares of Common Stock of the Company having  an
aggregate  Market Price (as defined in the Rights Agreement), on the date of the
public announcement of an Acquiring Person's becoming such that gave rise to the
Flip-in Date, equal to twice the Purchase  Price for an amount in cash equal  to
the  then current  Purchase Price.  In addition, the  Board of  Directors of the
Company may, at its option,  at any time after a  Flip-in Date and prior to  the
time  an Acquiring Person becomes  the Beneficial Owner of  more than 50% of the
outstanding shares of  Common Stock, elect  to exchange all  (but not less  than
all)  the then outstanding  Rights (other than Rights  beneficially owned by the
Acquiring Person or any Affiliate or Associate thereof, which Rights have become
void) for shares of  Common Stock at  an exchange ratio of  one share of  Common
Stock  per  Right,  appropriately adjusted  to  reflect any  stock  split, stock
dividend or  similar  transaction occurring  after  the Distribution  Date  (the
"Exchange  Ratio"). Immediately upon such action  by the Board of Directors (the
"Exchange Time"), the right to exercise the Rights will terminate and each Right
(other than Rights beneficially owned by  the Acquiring Person or any  Affiliate
or  Associate thereof, which Rights have  become void) will thereafter represent
only the  right to  receive a  number of  shares of  Common Stock  equal to  the
Exchange Ratio.
 
    Whenever the Company shall become obligated under the preceding paragraph to
issue  shares of Common  Stock upon exercise  of or in  exchange for Rights, the
Company, at its option, may substitute therefor shares of Preference Stock, at a
ratio of one one-thousandth  of a share  of Preference Stock  for each share  of
Common Stock so issuable.
 
    In  the event  that the  Company is  acquired in  a merger  or other similar
business combination entered into  while the Acquiring Person  is in control  of
the  Board of Directors of the Company or 50% or more of the Company's assets or
assets representing 50% or more of  the Company's operating income or cash  flow
are  transferred to an Acquiring Person  or affiliate thereof, the Company shall
take such action  as necessary to  ensure that the  Rights will "flip-over"  and
entitle  each  holder of  a Right  to  purchase capital  stock of  the acquiring
corporation having  a market  value equal  to twice  the purchase  price of  the
Preference Stock otherwise purchaseable pursuant to a Right.
 
    At any time prior to the earlier of a Flip-in Date and the tenth anniversary
of  the Rights Agreement, the  Board of Directors of  the Company may redeem the
Rights in whole, but not in part, at  a price of $0.01 per Right. Under  certain
circumstances  the Rights Plan may be amended from  time to time by the Board of
Directors of the Company without approval of the Company's shareholders.
 
    After the first date of public announcement by the Company that there is  an
Acquiring  Person and  prior to  the time that  an Acquiring  Person becomes the
beneficial owner of more than 50% of the outstanding shares of Common Stock, the
Board of Directors of the Company may  elect to exchange each Right (other  than
Rights  owned by the Acquiring Person) for shares of Common Stock of the Company
at an exchange ratio of one share of Common Stock per Right.
 
    The  Rights  have  certain  anti-takeover  effects.  The  Rights  may  cause
substantial  dilution to a person or group  that attempts to acquire the Company
without   Board   approval.   The   Rights   will   not   interfere   with   any
 
                                       21
<PAGE>
merger or other business combination with a third party approved by the Board of
Directors of the Company since the Board of Directors may, at its option, at any
time  prior to  a Flip-in Date,  redeem all  but not less  than all  of the then
outstanding Rights as described above.
 
MISCELLANEOUS
 
    The outstanding Common Stock of the Company is, and the Common Stock offered
pursuant to  the offering  when issued  and paid  for will  be, fully  paid  and
non-assessable.  Holders of Common  Stock do not have  any preemptive rights. On
liquidation, after  payment of  the liquidation  preferences of  the  Preference
Stock,  the holders of the Common Stock  will be entitled to receive all amounts
remaining for distribution to stockholders.
 
    The Co-Transfer Agents for the Common Stock are First Chicago Trust  Company
of  New York, New York, New York, UMB  Bank, N.A., Kansas City, Missouri and The
R-M Trust Company, Toronto, Ontario, Canada. The Registrar for the Common  Stock
is First Chicago Trust Company of New York, New York, New York.
 
    The  outstanding shares of  the Common Stock  are, and the  shares of Common
Stock offered pursuant to the offering will be, listed on the New York,  Pacific
and Toronto Stock Exchanges.
 
                                       22
<PAGE>
                                  UNDERWRITING
 
    Under   the  terms  and  conditions   of  the  Underwriting  Agreement,  the
underwriters (the "Underwriters") named below,  for whom Merrill Lynch,  Pierce,
Fenner  & Smith Incorporated,  Dean Witter Reynolds Inc.,  Goldman, Sachs & Co.,
J.P.  Morgan  Securities  Inc.,  and  PaineWebber  Incorporated  are  acting  as
representatives  (the "Representatives"), have severally  agreed to purchase and
the Company has agreed to sell to each Underwriter, shares of Common Stock which
equal the  number of  shares set  forth opposite  the name  of such  Underwriter
below:
 
<TABLE>
<CAPTION>
             NAME                                                                      NUMBER OF SHARES
- -------------------------------------------------------------------------------------  -----------------
<S>                                                                                    <C>
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated...............................................................         620,000
Dean Witter Reynolds Inc.............................................................         620,000
Goldman, Sachs & Co..................................................................         620,000
J.P. Morgan Securities Inc...........................................................         620,000
PaineWebber Incorporated.............................................................         620,000
Bear, Stearns & Co. Inc..............................................................         100,000
Donaldson, Lufkin & Jenrette Securities Corporation..................................         100,000
A.G. Edwards & Sons, Inc.............................................................         100,000
Morgan Stanley & Co. Incorporated....................................................         100,000
Oppenheimer & Co., Inc...............................................................         100,000
Prudential Securities Incorporated...................................................         100,000
Smith Barney Inc.....................................................................         100,000
Advest, Inc..........................................................................          50,000
Arneson, Kercheville, Ehrenberg & Associates, Inc....................................          50,000
Robert W. Baird & Co. Incorporated...................................................          50,000
George K. Baum & Company.............................................................          50,000
J.C. Bradford & Co...................................................................          50,000
Dain Bosworth Incorporated...........................................................          50,000
Dominick & Dominick, Incorporated....................................................          50,000
EVEREN Securities, Inc...............................................................          50,000
Fahnestock & Co. Inc.................................................................          50,000
First of Michigan Corporation........................................................          50,000
Hanifen, Imhoff Inc..................................................................          50,000
Huntleigh Securities Corporation.....................................................          50,000
Hudson Knight Securities, Inc........................................................          50,000
Janney Montgomery Scott Inc..........................................................          50,000
Edward D. Jones & Co., L.P...........................................................          50,000
Kirkpatrick, Pettis, Smith, Polian Inc...............................................          50,000
Ladenburg, Thalmann & Co. Inc........................................................          50,000
Legg Mason Wood Walker, Incorporated.................................................          50,000
McDonald & Company Securities, Inc...................................................          50,000
Nesbitt Burns Securities Inc.........................................................          50,000
The Ohio Company.....................................................................          50,000
Petrie Parkman & Co., Inc............................................................          50,000
Piper Jaffray Inc....................................................................          50,000
Principal Financial Securities, Inc..................................................          50,000
The Robinson-Humphrey Company, Inc...................................................          50,000
Roney & Co., LLC.....................................................................          50,000
Smith, Moore & Co....................................................................          50,000
Stifel, Nicolaus & Company, Incorporated.............................................          50,000
Wheat, First Securities, Inc.........................................................          50,000
                                                                                       -----------------
          Total......................................................................       5,250,000
                                                                                       -----------------
                                                                                       -----------------
</TABLE>
 
                                       23
<PAGE>
    The  Company has been  advised by the  Representatives that the Underwriters
propose to offer part of the shares  to the public at the public offering  price
set  forth on the cover page hereof and part to certain dealers at a price which
represents a  concession  not in  excess  of $.50  per  share below  the  public
offering  price. The  Underwriters may  allow, and  such dealers  may reallow, a
concession not in excess of $.10 per  share to certain other underwriters or  to
certain other brokers or dealers. The nature of the Underwriters' obligations is
such  that they are  committed to take and  pay for all of  the shares of Common
Stock offered  hereby  if any  are  taken, provided  that,  under  circumstances
involving  a default  of any of  the Underwriters,  less than all  of the Common
Stock offered hereby may be purchased.
 
    The Company has granted an option to the Underwriters, exercisable within 30
days after the date of the Underwriting Agreement to purchase up to a maximum of
750,000 additional shares of Common Stock at  the same price per share that  the
Company  will  receive  for  shares being  purchased  by  the  Underwriters. The
Underwriters may  purchase such  shares only  to cover  over-allotments made  in
connection  with the sale of the 5,250,000  shares shown in the foregoing table.
If the Underwriters purchase any of the additional shares of Common Stock  which
are  subject  to the  over-allotment option,  each of  the Underwriters  will be
committed, subject to  certain conditions,  to purchase  approximately the  same
percentage  thereof which the number of shares to be purchased by it as shown in
the foregoing table bears to 5,250,000.
 
    The Company and the Underwriters have agreed to indemnify each other against
certain liabilities, including liabilities under the Securities Act of 1933,  as
amended.
 
    The Company has agreed that, for a period of 120 days after the date of this
Prospectus,   it  will   not,  without   the  prior   written  consent   of  the
Representatives, offer for  sale, sell  or otherwise  dispose of  any shares  of
Common  Stock, or sell or grant options,  rights or warrants with respect to any
shares of Common  Stock or other  securities convertible into  shares of  Common
Stock  (other  than shares  of  Common Stock  and  options issuable  pursuant to
Company  employee  and  director  plans   and  Company  dividend  and   interest
reinvestment and stock purchase plans).
 
    Certain  of the Underwriters  and their affiliates have,  from time to time,
provided and  may  in  the  future provide  commercial  and  investment  banking
services to the Company and its affiliates.
 
                                 LEGAL OPINIONS
 
    The  legality of the shares offered pursuant  to the offering will be passed
upon for the  Company by Blackwell  Sanders Matheny Weary  & Lombardi L.C.,  Two
Pershing  Square, 2300  Main Street,  Kansas City,  Missouri 64108,  and for the
Underwriters by Milbank, Tweed,  Hadley & McCloy, 1  Chase Manhattan Plaza,  New
York, New York 10005. Milbank, Tweed, Hadley & McCloy from time to time provides
legal services to the Company.
 
                                    EXPERTS
 
    The   consolidated  financial  statements  and  schedules  included  in  the
Company's Annual Report on Form 10-K for the years ended December 31, 1995, 1994
and 1993, which  are incorporated  by reference  in this  Prospectus, have  been
audited  by Arthur Andersen LLP, independent public accountants, as indicated in
their reports with respect thereto, and are incorporated herein in reliance upon
the authority of said firm as experts in giving said reports.
 
    The financial statements  of United  Energy included in  the Company's  Form
8-K/A,  dated April 1, 1996, for  the period 11 May 1994  to 30 June 1995, which
are incorporated by reference  in this Prospectus, have  been audited by  Arthur
Andersen,  independent  public accountants,  as indicated  in their  report with
respect thereto, and are incorporated herein  in reliance upon the authority  of
said firm as experts in giving said reports.
 
                                       24
<PAGE>
                                     [LOGO]
<PAGE>
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    NO  PERSON IS AUTHORIZED IN CONNECTION WITH ANY OFFERING MADE HEREBY TO GIVE
ANY INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED IN THIS  PROSPECTUS,
AND,  IF GIVEN OR  MADE, SUCH INFORMATION  OR REPRESENTATION MUST  NOT BE RELIED
UPON AS  HAVING  BEEN  AUTHORIZED  BY  THE  COMPANY  OR  ANY  UNDERWRITER.  THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY  ANY SECURITY OTHER THAN THE SHARES OF COMMON STOCK OFFERED HEREBY, NOR DOES
IT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO BUY ANY OF  THE
SECURITIES  OFFERED HEREBY  TO ANY  PERSON IN  ANY JURISDICTION  IN WHICH  IT IS
UNLAWFUL TO  MAKE SUCH  AN OFFER  OR SOLICITATION  TO SUCH  PERSON. NEITHER  THE
DELIVERY  OF  THIS  PROSPECTUS  NOR  ANY SALE  MADE  HEREUNDER  SHALL  UNDER ANY
CIRCUMSTANCES CREATE ANY  IMPLICATION THAT THE  INFORMATION CONTAINED HEREIN  IS
CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE HEREOF.
 
                              -------------------
 
                               TABLE OF CONTENTS
                                   PROSPECTUS
 
<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Available Information..........................           2
Incorporation of Certain Documents by
 Reference.....................................           2
Prospectus Summary.............................           3
The Company....................................           6
Recent Developments............................          12
Use of Proceeds and Financing Program..........          13
Common Stock Dividends and Price Range.........          14
Capitalization.................................          16
Selected Financial Information.................          17
Description of Common Stock....................          19
Underwriting...................................          23
Legal Opinions.................................          24
Experts........................................          24
</TABLE>
 
                                5,250,000 SHARES
 
                                     [LOGO]
 
                                [UtiliCorp Logo]
 
                                  COMMON STOCK
 
                               "$1.00 PAR VALUE"
 
                                 --------------
 
                                   PROSPECTUS
 
                                 -------------
 
                              MERRILL LYNCH & CO.
                           DEAN WITTER REYNOLDS INC.
                              GOLDMAN, SACHS & CO.
                               J.P. MORGAN & CO.
                            PAINEWEBBER INCORPORATED
 
                               NOVEMBER 20, 1996
 
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