WPS RESOURCES CORP
424B5, 1999-11-05
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
PROSPECTUS SUPPLEMENT                                      SUBJECT TO COMPLETION

(TO PROSPECTUS DATED OCTOBER 22, 1999)                          NOVEMBER 4, 1999
THE INFORMATION IN THIS PROSPECTUS SUPPLEMENT AND THE ATTACHED PROSPECTUS IS NOT
COMPLETE AND MAY BE CHANGED. THIS PROSPECTUS SUPPLEMENT AND THE ATTACHED
PROSPECTUS ARE NOT AN OFFER TO SELL THESE SECURITIES AND ARE NOT SOLICITING AN
OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER AND SALE IS NOT
PERMITTED.
<PAGE>

<TABLE>
<S>                                                  <C>
                                                                     Filed Pursuant to Rule 424(b)(5)
                                                                           Registration No. 333-88525

                    $150,000,000
             WPS RESOURCES CORPORATION                                                         [LOGO]
          % SENIOR NOTES DUE NOVEMBER 1, 20
</TABLE>

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

    We will pay interest on the Senior Notes Due November 1, 20 , at the rate of
  % per year on May 1 and November 1 of each year, beginning on May 1, 2000. We
will sell the notes only in denominations of $1,000 and integral multiples of
that amount. We may redeem the notes in whole or in part at any time at a
redemption price equal to the greater of (1) 100% of principal or (2) the sum of
the remaining scheduled payments of principal and interest on the notes
discounted to the redemption date on a semiannual basis (assuming a 360-day year
consisting of twelve 30-day months) at the "treasury yield" plus   %, plus in
each case accrued interest to the redemption date, as set forth in this
prospectus supplement, without premium. The notes constitute a series of our
senior debt securities and are unsecured and unsubordinated. The notes will be
effectively subordinated to creditors and preferred shareholders of our
subsidiaries with respect to the assets and earnings of our subsidiaries. See
"Description of the Debt Securities" in the accompanying prospectus.
                              -------------------

    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
 COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
  ACCURACY OF THIS PROSPECTUS SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                              -------------------

<TABLE>
<CAPTION>
                                                        PER NOTE                       TOTAL
                                                        --------                       -----
<S>                                           <C>                           <C>
Public Offering Price(1)....................               %                             $
Underwriting Commission(2)..................               %                             $
Proceeds to Company(1)(3)...................               %                             $
</TABLE>

- -------

(1) The initial public offering price does not include accrued interest.
    Interest, if any, on the notes will accrue from            , 1999, and must
    be paid by the purchaser if notes are delivered after            , 1999.

(2) We have agreed to indemnify the underwriters against certain liabilities,
    including liabilities under the Securities Act of 1933.

(3) Before deducting expenses payable by us estimated at $280,000.
                              -------------------

    The underwriters are severally offering the notes, subject to the prior
receipt and acceptance of the notes by the underwriters and their right to
reject any order in whole or in part. Delivery of the notes will be made in
book-entry form only through the facilities of The Depository Trust Company on
or about November  , 1999.
                              -------------------

A.G. EDWARDS & SONS, INC.

                ROBERT W. BAIRD & CO.
                               INCORPORATED

                                LEGG MASON WOOD WALKER    INCORPORATED

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

          THE DATE OF THIS PROSPECTUS SUPPLEMENT IS            , 1999.
<PAGE>
                                  THE COMPANY

    We operate as a holding company with both regulated and non-regulated
business units. We are organized under the laws of the State of Wisconsin. Our
principal wholly-owned subsidiary is Wisconsin Public Service Corporation, a
regulated electric and gas utility operating in northeastern Wisconsin and the
Upper Peninsula of Michigan. Our other major subsidiaries are Upper Peninsula
Power Company, a regulated electric company operating in the Upper Peninsula of
Michigan, and WPS Resources Capital Corporation, an intermediate holding company
for our unregulated subsidiaries. Our unregulated subsidiaries include WPS
Energy Services, Inc., a diversified energy company which sells electric energy,
natural gas and alternate fuel products, risk management consulting services and
project management, and WPS Power Development, Inc., which develops, acquires
and owns electric projects and provides services to the electric power
generation industry.

                                 RECENT EVENTS

    On November 1, 1999 our subsidiary WPS Power Development, Inc., through its
subsidiary, Sunbury Holdings, LLC, completed the purchase of the Sunbury
Generation Station, a four-unit coal fired power plant located in Shamokin Dam,
Pennsylvania, from PP&L Resources, Inc. The assets acquired in the $106 million
transaction include the coal-fired units with a demonstrated winter capacity of
389 megawatts, two 42-megawatt oil-fired combustion turbines, coal inventory and
the Lady Jane Collieries, a coal transshipment facility. Under the terms of a
three-year agreement, Sunbury Holdings, LLC, will sell a portion of the
electricity from the Sunbury plant to PP&L, Inc. The remainder will be sold
through a five-year contract with a wholesale marketer and on the wholesale
energy market through WPS Energy Services, Inc., our energy marketing
subsidiary.

                            DESCRIPTION OF THE NOTES

<TABLE>
<S>                                            <C>
Notes Offered................................  $150 million principal amount of   % Senior
                                               Notes due November 1, 20 .

Maturity.....................................  November 1, 20

Interest Rate................................  The notes will bear interest at the rate of
                                                 % per year.

Interest Payment Dates.......................  May 1 and November 1 (commencing May 1,
                                               2000).

Ranking......................................  The notes will be unsecured general
                                               obligations and will rank on a parity with
                                               our other senior unsecured indebtedness.

                                               Claims of creditors and any preferred
                                               shareholders of each of our subsidiaries
                                               generally will have priority with respect to
                                               the assets and earnings of the subsidiaries
                                               over the claims of our creditors. The notes
                                               therefore will be effectively subordinated to
                                               creditors, including holders of secured
                                               indebtedness, and preferred shareholders of
                                               our subsidiaries.

                                               Since we are a holding company, our ability
                                               to pay debt service on the notes is largely
                                               dependent upon the ability of our
                                               subsidiaries to pay dividends and make debt
                                               service payments to us. See "DESCRIPTION OF
                                               COMMON STOCK--
</TABLE>

                                      S-2
<PAGE>
<TABLE>
<S>                                            <C>
                                               Restrictions on Dividends Payable by
                                               Wisconsin Public Service Corporation" in the
                                               attached prospectus.

Certain Covenants............................  The notes will be issued under the senior
                                               indenture which contains covenants that,
                                               among other things, restrict our ability to
                                               transfer the voting common stock of our
                                               subsidiary, Wisconsin Public Service
                                               Corporation, or to encumber the common stock
                                               of any of our subsidiaries.

Use of Proceeds..............................  The proceeds from the notes will be applied
                                               to retire short-term indebtedness incurred by
                                               us to fund equity commitments to our
                                               subsidiaries including Wisconsin Public
                                               Service Corporation and finance acquisitions
                                               by our non-regulated subsidiaries.

Form and Denomination........................  We will sell the notes in denominations of
                                               $1,000 and integral multiples of that amount,
                                               and the notes will be initially represented
                                               by a global note registered in the name of a
                                               nominee of The Depository Trust Company.

Optional Redemption..........................  We may redeem the notes at our option, in
                                               whole at any time or in part from time to
                                               time, at a redemption price equal to the
                                               greater of (1) 100% of principal or (2) the
                                               sum of the present values of the remaining
                                               scheduled payments of principal and interest
                                               on the notes which we redeem, discounted to
                                               the date of redemption on a semiannual basis,
                                               assuming a 360-day year consisting of twelve
                                               30-day months, at the "treasury yield," as
                                               defined below, plus     ( %), plus in each
                                               case accrued interest to the date of
                                               redemption. The notes have no sinking fund
                                               provisions.

                                               "Treasury yield" means, with respect to any
                                               redemption date, the rate per year equal to
                                               the semiannual equivalent yield to maturity
                                               of the "comparable treasury issue," as
                                               defined below, assuming a price for the
                                               comparable treasury issue, expressed as a
                                               percentage of its principal amount equal to
                                               the "comparable treasury price," as defined
                                               below, for the redemption date.

                                               "Comparable treasury issue" means the United
                                               States Treasury security selected by an
                                               "independent investment banker," as defined
                                               below, as having a maturity comparable to the
                                               remaining term of the notes that the
                                               independent investment banker would utilize,
                                               at the time of selection and in accordance
                                               with customary financial practice, in pricing
                                               new issues of corporate debt securities of
                                               comparable maturity to the remaining term of
                                               the
</TABLE>

                                      S-3
<PAGE>
<TABLE>
<S>                                            <C>
                                               notes. "Independent investment banker" means
                                               one of the "reference treasury dealers," as
                                               defined below, appointed by the senior
                                               indenture trustee after consultation with us.

                                               "Comparable treasury price" means, with
                                               respect to any redemption date, (1) the
                                               average of the bid and asked prices for the
                                               comparable treasury issue, expressed in each
                                               case as a percentage of its principal amount,
                                               on the third business day preceding the
                                               redemption date, as set forth in the daily
                                               statistical release, or any successor
                                               release, published by the Federal Reserve
                                               Bank of New York and designated "Composite
                                               3:30 p.m. Quotations for U.S. Government
                                               Securities" or (2) if that release or any
                                               successor release is not published or does
                                               not contain those prices on that business
                                               day, (A) the average of the "reference
                                               treasury dealer quotations," as defined
                                               below, for the redemption date, after
                                               excluding the highest and lowest reference
                                               treasury dealer quotations for the redemption
                                               date, or (B) if the senior indenture trustee
                                               obtains fewer than four reference treasury
                                               dealer quotations, the average of all the
                                               quotations which the senior indenture trustee
                                               obtains. "Reference treasury dealer
                                               quotations" means, with respect to each
                                               reference treasury dealer and any redemption
                                               date, the average, as determined by us, of
                                               the bid and asked prices for the comparable
                                               treasury issue, expressed in each case as a
                                               percentage of its principal amount, quoted in
                                               writing to us by the reference treasury
                                               dealer at 5:00 p.m. on the third business day
                                               preceding the redemption date.

                                               "Reference treasury dealer" means any primary
                                               U.S. Government securities dealer in New York
                                               City selected by us.

                                               If we determine to redeem less than all of
                                               the notes, the senior indenture trustee shall
                                               select, in such manner as it shall deem fair
                                               and appropriate, the particular notes or
                                               portions of notes to be redeemed. The senior
                                               indenture trustee shall give notice of
                                               redemption by mail not less than 30 nor more
                                               than 45 days before the date fixed for
                                               redemption to the holders of notes to be
                                               redeemed (which, as long as the notes are in
                                               the book-entry only system, will be The
                                               Depository Trust Company ("DTC") or its
                                               nominee or a successor depositary. On and
                                               after the date fixed for redemption, unless
                                               we shall default in the payment of the
                                               redemption price and interest accrued on the
                                               notes to the date
</TABLE>

                                      S-4
<PAGE>
<TABLE>
<S>                                            <C>
                                               fixed for redemption), interest on the notes
                                               or the portions of the notes called for
                                               redemption shall cease to accrue.

                                               The senior indenture trustee will not mail
                                               any notice of redemption of the notes during
                                               the continuance of any event of default under
                                               the senior indenture, except that (1) when
                                               notice of redemption of any notes has been
                                               mailed, we shall redeem such notes but only
                                               if we have deposited before the occurrence of
                                               the event of default funds sufficient for
                                               that purpose with the senior indenture
                                               trustee or a paying agent for that purpose,
                                               and (2) the senior indenture trustee may mail
                                               notices of redemption of all outstanding
                                               notes during the continuance of an event of
                                               default under the Indenture.

                                               Unless we have deposited with the senior
                                               indenture trustee, at the time of mailing of
                                               any notice of redemption, an amount in cash
                                               sufficient to redeem all of the notes called
                                               for redemption, such notice will state that
                                               it is subject to the receipt of the
                                               redemption moneys by the senior indenture
                                               trustee before the redemption date, and such
                                               notice shall be of no effect unless such
                                               moneys are so received before such date.
</TABLE>

                                      S-5
<PAGE>
                         SUMMARY FINANCIAL INFORMATION
                             (DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                               NINE MONTHS ENDED
                                               YEAR ENDED DECEMBER 31,           SEPTEMBER 30,
                                               -----------------------         -----------------
                                             1996       1997        1998        1998       1999
                                             ----       ----        ----        ----       ----
                                                                                  (UNAUDITED)
<S>                                        <C>        <C>        <C>          <C>        <C>
CONSOLIDATED STATEMENT OF INCOME DATA
  Operating Revenues.....................  $916,449   $935,837   $1,063,736   $771,208   $802,391
  Operating Income.......................   112,652    108,161      100,044     82,740     89,045
  Net Income.............................    52,885     55,809       46,631     40,216     46,612
</TABLE>

<TABLE>
<CAPTION>
                                                                             AS        AS ADJUSTED
                                                              AMOUNT     ADJUSTED(A)   PERCENTAGE
                                                              ------     -----------   -----------
<S>                                                         <C>          <C>           <C>
CONSOLIDATED CAPITALIZATION AT SEPTEMBER 30, 1999
  Long-term Debt(b).......................................  $  340,784   $  490,784          40.9%
  Preferred Stock of Subsidiary (without mandatory
    redemption provisions)................................      51,195       51,195           4.3%
  Mandatorily Redeemable Trust Preferred Securities of
    Subsidiary Trust......................................      50,000       50,000           4.2%
  Capital Lease Obligations of Subsidiary.................      73,765       73,765           6.1%
  Common Stock Equity(b)..................................     533,931      533,931          44.5%
                                                            ----------   ----------    ----------
    Total Capitalization..................................  $1,049,675   $1,199,765         100.0%
                                                            ==========   ==========    ==========
</TABLE>

- -------

    (a)  Adjusted to reflect the issuance of $150,000,000 of the notes.

    (b) Long-term debt includes $323,175,000 principal amount of first mortgage
       bonds of our utility subsidiaries (less current portion and unamortized
       discount and premium) and $19,154,000 of other debt of our subsidiaries.
       Long-term debt is increased by $4,089,000 and common stock equity is
       reduced by the same amount to reflect Wisconsin Public Service
       Corporation's guaranty of bank loans to the Wisconsin Public Service
       Corporation ESOP (Employee Stock Ownership Plan).

               RATIOS OF EARNINGS TO FIXED CHARGES (UNAUDITED)(A)

<TABLE>
<CAPTION>
                                                                                                            NINE MONTHS
                                                                                                               ENDED
                                                                  YEAR ENDED DECEMBER 31,                  SEPTEMBER 30,
                                                                  -----------------------                  -------------
                                                      1994       1995       1996       1997       1998          1999
                                                      ----       ----       ----       ----       ----          ----
<S>                                                 <C>        <C>        <C>        <C>        <C>        <C>
Ratio of Earnings to Fixed Charges................   3.42       3.49       3.11       3.19       2.80        3.10
</TABLE>

- -------

    (a)  We have computed the ratio of earnings to fixed charges by dividing
       earnings, which include income before taxes and fixed charges, by fixed
       charges. This calculation excludes the effects of accounting changes
       which we have made over time. "Fixed charges" consist of (1) interest on
       debt and a portion of rentals determined to be representative of interest
       and (2) the preferred stock dividend requirements of our subsidiaries.
       The preferred stock dividend requirements of our subsidiaries were
       assumed to be equal to the pre-tax earnings that would be required to
       cover such dividend requirements based on our effective income tax rates
       for the respective periods.

                                      S-6
<PAGE>
               BOOK-ENTRY ISSUANCE--THE DEPOSITORY TRUST COMPANY

    DTC will act as securities depositary for the notes. The notes will
initially be issued only as fully-registered securities registered in the name
of Cede & Co. (DTC's partnership nominee). One or more fully-registered global
certificates representing the total aggregate principal amount of the notes will
be issued and will be deposited with the senior indenture trustee as custodian
for DTC.

    The laws of some jurisdictions require that certain purchasers of securities
take physical delivery of securities in definitive form. Such laws may impair
the ability to transfer beneficial interests in the notes as represented by a
global certificate.

    For additional information relating to DTC and the book-entry issuance
system, see "Description of the Debt Securities --Book-Entry Securities" in the
attached prospectus.

    DTC has advised us that its management is aware that some computer
applications, systems and the like for processing data that are dependent upon
calendar dates, including dates before, on, and after January 1, 2000, may
encounter "Year 2000 problems." DTC has informed the industry, including direct
and indirect participants and other members of the financial community, that it
has developed and is implementing a program so that its systems, as the same
relate to the timely payment of distributions, including principal and interest
payments, to security holders, book-entry deliveries, and settlement of trades
within DTC, continue to function appropriately. This program includes a
technical assessment and a remediation plan, each of which is complete.
Additionally, DTC's plan includes a testing phase, which is expected to be
completed within appropriate time frames.

    However, DTC's ability to perform its services properly also is dependent
upon other parties, including, but not limited to, issuers and their agents, as
well as third-party vendors from whom it licenses software and hardware, and
third-party vendors on whom it relies for information or the provision of
services, including telecommunication and electrical utility service providers,
among others. DTC has informed the industry that it is contacting and will
continue to contact third-party vendors from whom it acquires services (1) to
impress upon them the importance of these services being Year 2000 compliant,
and (2) to determine the extent of their efforts for Year 2000 remediation and,
as appropriate, testing of their services. In addition, DTC is in the process of
developing contingency plans as it deems appropriate.

                                  UNDERWRITING

    Subject to the terms and conditions set forth in the underwriting agreement,
we have agreed to sell to each of the underwriters named below, and each of the
underwriters has severally agreed to purchase, the principal amounts of the   %
Senior Notes Due November 1, 20 set forth opposite their names below:

<TABLE>
<CAPTION>
                                                               PRINCIPAL
                                                               AMOUNT OF
                        UNDERWRITER                           SENIOR NOTES
                        -----------                           ------------
<S>                                                           <C>
A.G. Edwards & Sons, Inc....................................  $
Robert W. Baird & Co. Incorporated..........................
Legg Mason Wood Walker, Incorporated........................
                                                              ------------
  Total.....................................................  $150,000,000
                                                              ============
</TABLE>

    Under the terms and conditions of the underwriting agreement, the
underwriters agree to take and pay for all the notes, if any are taken.

    The underwriters propose to offer the notes in part directly to purchasers
at the initial public offering price set forth on the cover page of this
prospectus supplement and in part to certain securities dealers at that price
less a concession of   % of the principal amount of the notes. The underwriters
may allow, and such dealers may reallow, a concession not to exceed   % of the
principal amount of the notes to certain

                                      S-7
<PAGE>
brokers and dealers. After we release the notes for sale to the public, the
underwriters may from time to time vary the offering price and other selling
terms.

    The notes constitute a new issue of securities with no established trading
market. The underwriters have advised us that they intend to make a market in
the notes but the underwriters have not obligated themselves to do so and may
discontinue market making at any time without notice. We can give you no
assurance as to the liquidity of the trading market for the notes.

    The underwriters are permitted to engage in certain transactions that
maintain or affect the price of the notes. Such transactions may include
purchases to cover short positions created by the underwriters in connection
with the offering. If the underwriters create a short position in the notes in
connection with the offering by selling notes in an aggregate principal amount
that exceeds the amount set forth on the cover page of this prospectus
supplement, they may reduce that short position by purchasing notes in the open
market. In general, purchases of a security to reduce a short position could
cause the price of the security to be higher than it might be in the absence of
such purchases.

    Neither we nor the underwriters make any representation or prediction as to
the direction or magnitude of any effect that the transactions described above
may have on the price of the notes. In addition, neither we nor the underwriters
make any representation that the underwriters will engage in such transactions
or that, if they engage in such transactions, they will not discontinue such
transactions without notice.

    Certain of the underwriters and their affiliates have engaged and in the
future may engage in investment banking transactions with, and the provision of
services to, us and our subsidiaries in the ordinary course of business.

    We have agreed to indemnify the several underwriters against certain
liabilities, including liabilities under the Securities Act of 1933.

                                 LEGAL MATTERS

    Our counsel, Foley & Lardner, Milwaukee, Wisconsin will issue its opinion as
to the validity of the notes being issued. Schiff Hardin & Waite, Chicago,
Illinois will issue an opinion for the underwriters as to certain matters
relating to the offering of the notes.

                                      S-8
<PAGE>
PROSPECTUS

                           WPS RESOURCES CORPORATION
                             700 NORTH ADAMS STREET
                                 P.O. BOX 19001
                        GREEN BAY, WISCONSIN 54307-9001
                                 (920) 433-1727
                                  $400,000,000

                                DEBT SECURITIES
                 COMMON STOCK (WITH ASSOCIATED PURCHASE RIGHTS)

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

    WE WILL PROVIDE SPECIFIC TERMS OF THESE SECURITIES IN SUPPLEMENTS TO THIS
PROSPECTUS.

    YOU SHOULD READ THIS PROSPECTUS AND ANY SUPPLEMENT CAREFULLY BEFORE YOU
INVEST.

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

    THESE SECURITIES HAVE NOT BEEN APPROVED BY THE SECURITIES AND EXCHANGE
COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAVE THESE ORGANIZATIONS
DETERMINED THAT THIS PROSPECTUS IS ACCURATE OR COMPLETE. ANY REPRESENTATION TO
THE CONTRARY IS A CRIMINAL OFFENSE.

    THE DATE OF THIS PROSPECTUS IS OCTOBER 22, 1999.
<PAGE>
                                    SUMMARY

    This summary highlights selected information from this document and may not
contain all of the information that is important to you. To understand the terms
of our securities, you should carefully read this document with the attached
prospectus supplement. Together these documents will give the specific terms of
the securities we are offering. You should also read the documents we have
incorporated by reference into this prospectus for information on us and our
financial statements.

THE SECURITIES WE MAY OFFER

    This prospectus is part of a registration statement (No. 333-88525) that we
filed with the Securities and Exchange Commission utilizing a "shelf"
registration process. Under this shelf process, we may offer from time to time
up to $400,000,000 of the following securities: debt securities and common stock
with associated common stock purchase rights. This prospectus provides you with
a general description of the securities we may offer. Each time we offer
securities, we will provide you with a prospectus supplement that will describe
the specific amounts, prices and terms of the securities being offered. The
prospectus supplement may also add, update or change information contained in
this prospectus.

DEBT SECURITIES

    We may offer unsecured general obligations of our company, which may be
senior or subordinate. We will refer to the senior debt securities and the
subordinated debt securities together in this prospectus as the "debt
securities". The senior debt securities will have the same rank as all of our
other unsecured, unsubordinated debt. The subordinated debt securities will be
entitled to payment only after payment on our senior indebtedness. Senior
indebtedness includes all indebtedness for money borrowed by us, except our
currently outstanding junior subordinated deferrable interest debentures due
2038 and any indebtedness issued in the future that is stated to be not superior
to, or to have the same rank as, the subordinated debt securities.

    Claims of creditors and any preferred shareholders of each of our
subsidiaries generally will have priority with respect to the assets and
earnings of such subsidiaries over the claims of our creditors. The debt
securities therefore will be effectively subordinated to creditors, including
holders of secured indebtedness, and preferred shareholders of our subsidiaries.

    The senior debt securities will be issued under an indenture between us and
Firstar Bank, National Association. The subordinated debt securities will be
issued under an indenture between us and the trustee we name in a prospectus
supplement. We encourage you to read the indentures which are exhibits to the
registration statement and our recent periodic and current reports that we file
with the Securities and Exchange Commission.

GENERAL INDENTURE PROVISIONS THAT APPLY TO SENIOR AND SUBORDINATED DEBT
  SECURITIES

    Neither indenture limits the amount of debt that we may incur. In addition,
neither indenture provides holders with any protection should there be a
recapitalization or restructuring involving our company.

    The indentures allow us to merge or consolidate with another company, or to
sell all or most of our assets to another company. If these events occur, the
other company will be required to assume our responsibilities relating to the
debt securities, and we will be released from all liabilities and obligations.

    The indentures provide that holders of a majority of the outstanding
principal amount of any series of debt securities may vote to change our
obligations or your rights concerning that series. However, to change the amount
or timing of payments of principal or interest or other payments for a series of
debt securities, every holder in the series must consent.

                                       1
<PAGE>
    We may discharge our obligations under the indenture relating to the senior
or subordinated debt securities by depositing with the trustee sufficient funds
or government obligations to pay the senior or subordinated debt securities when
due.

    EVENTS OF DEFAULT. Each indenture provides that the following are events of
default:

    - If we do not pay interest for 30 days after its due date.

    - If we do not pay principal or premium when due.

    - If we continue to breach a covenant for 60 days after notice.

    - If we enter bankruptcy or become insolvent.

    If an event of default occurs with respect to any series of debt securities,
the trustee or holders of 25% of the outstanding principal amount of that series
may declare the principal amount of the series immediately payable. However,
holders of a majority of the principal amount may rescind this action. If the
event of default is due to our bankruptcy or insolvency, the outstanding
principal amount of all the debt securities will become immediately payable,
without any action on the part of the trustees or the holders of the debt
securities.

GENERAL INDENTURE PROVISIONS THAT APPLY ONLY TO SENIOR DEBT SECURITIES

    Our failure to pay when due, subject to any applicable grace period, any
principal of, or interest on, any indebtedness for borrowed money incurred or
guaranteed by us in the aggregate principal amount of at least $50,000,000
constitutes an event of default under the senior indenture.

    The senior indenture requires us, so long as any senior debt securities are
outstanding:

    - to own all of the outstanding shares of voting common stock of Wisconsin
      Public Service Corporation unless we transfer the shares pursuant to our
      merger or consolidation or sale of substantially all of our properties.

    - not to pledge or grant a security interest or permit any pledge, security
      interest or other lien upon any common stock of any of our subsidiaries
      owned directly or indirectly by us to secure indebtedness for money
      borrowed without securing the senior debt securities equally and notably
      with the other secured indebtedness except for:

       - pledges, security interests or encumbrances created to secure the
         purchase price of the common stock of the subsidiaries,

       - liens and security interests existing at the time of our acquisition of
         the shares or

       - any extension or renewal of any permitted pledge, security interest or
         encumbrance.

GENERAL INDENTURE PROVISIONS THAT APPLY ONLY TO SUBORDINATED DEBT SECURITIES

    The subordinated debt securities will be subordinated to all senior
indebtedness. In addition, as previously noted under "Debt Securities", claims
of the creditors and preferred shareholders of each of our subsidiaries
generally will have priority with respect to that subsidiary's assets and
earnings over the claims of our creditors, including holders of the subordinated
debt securities. The subordinated debt securities, therefore, will be
effectively subordinated to creditors and preferred shareholders of our
subsidiaries.

COMMON STOCK

    We may offer shares of our common stock, par value $1.00 per share. Holders
of our common stock are entitled to receive dividends when declared by the Board
of Directors. Each holder of our common stock is entitled to one vote per share.
The holders of our common stock have no preemptive rights or

                                       2
<PAGE>
cumulative voting rights. Our articles of incorporation do not presently
authorize our company to issue preferred stock or other stock having rights
prior to those of the holders of our common stock.

    Each share of our common stock will have an associated right to purchase one
share of our common stock at an exercise price of $85 per share. The rights are
not presently exercisable. Under certain circumstances, however, each right will
entitle the holder to purchase at the exercise price our common stock having a
market value of twice the exercise price. See "DESCRIPTION OF COMMON STOCK--
Pre-emptive Rights; Common Stock Purchase Rights" in this Prospectus.

RATIOS OF EARNINGS TO FIXED CHARGES

    The ratio of earnings to fixed charges for each of the periods indicated are
as follows:

<TABLE>
<CAPTION>
                                                                          YEAR ENDED DECEMBER 31,
                                                      ----------------------------------------------------------------
                                                        1998          1997          1996          1995          1994
                                                      --------      --------      --------      --------      --------
<S>                                                   <C>           <C>           <C>           <C>           <C>
Ratio of Earnings to Fixed Charges..............        2.80          3.19          3.11          3.49          3.42
</TABLE>

    We have computed the ratio of earnings to fixed charges by dividing
earnings, which include income before taxes and fixed charges, by fixed charges.
This calculation excludes the effects of accounting changes which have been made
over time. "Fixed charges" consist of (1) interest on debt and a portion of
rentals determined to be representative of interest and (2) the preferred stock
dividend requirements of our subsidiaries. The preferred stock dividend
requirements of our subsidiaries were assumed to be equal to the pre-tax
earnings that would be required to cover such dividend requirements based on our
effective income tax rates for the respective periods.

                      WHERE YOU CAN FIND MORE INFORMATION

    We file annual, quarterly and current reports, proxy statements and other
information with the Securities and Exchange Commission. You may read and copy
any document we file at the Commission's public reference room at 450 Fifth
Street, N.W., Washington, D.C., 20549. Please call the Commission at
1-800-SEC-O330 for further information on the public reference rooms. Our
Securities and Exchange Commission filings are also available to the public at
the Commission's web site at http://www.sec.gov.

    The Securities and Exchange Commission allows us to "incorporate by
reference" into this prospectus the information we file with it, which means
that we can disclose important information to you by referring you to those
documents. The information incorporated by reference is considered to be part of
this prospectus, and later information that we file with the Commission will
automatically update and supersede this information. We incorporate by reference
the documents listed below and any future filings made with the Securities and
Exchange Commission under Section 13(a), 13(c), 14 or 15(d) of the Securities
Exchange Act of 1934 until our offering is completed:

    i.  Annual Report on Form 10-K for the year ended December 31, 1998, as
       amended by Form 10-K/A filed June 8, 1999;

    ii.  Quarterly Reports on Form 1O-Q for the quarters ended March 31, 1999
       and June 30, 1999;

    iii. Current Report on Form 8-K/A, filed on March 1, 1999, and Current
       Report on Form 8-K filed on June 1, 1999; and

    iv.  Description of Common Stock contained in Registration Statement on Form
       8-B filed on June 1, 1994; and

    v.  Description of Common Stock Purchase Rights contained in Registration
       Statement on Form 8-A filed on December 13, 1996.

    You may request a copy of these filings, at no cost, by writing to or
telephoning us at the following address:

                                       3
<PAGE>
             WPS Resources Corporation
             Attn: Secretary
             700 North Adams Street
             P.O. Box 19001
             Green Bay, Wisconsin 54307-9001
             (920) 433-1727

    Our reports are also available on our website located at
http://www.wpsr.com.

    You should rely only on the information incorporated by reference or
provided in this prospectus or any prospectus supplement. We have not authorized
anyone else to provide you with different information. We are not making an
offer of these securities in any state where the offer is not permitted. You
should not assume that the information in this prospectus or any prospectus
supplement is accurate as of any date other than the date on the front of the
document.

                                  THE COMPANY

    We operate as a holding company with both regulated and non-regulated
business units. We are organized under the laws of the State of Wisconsin. Our
principal wholly-owned subsidiary is Wisconsin Public Service Corporation, a
regulated electric and gas utility operating in northeastern Wisconsin and the
Upper Peninsula of Michigan. Our other major subsidiaries are Upper Peninsula
Power Company, a regulated electric company operating in the Upper Peninsula of
Michigan; WPS Energy Services, Inc., a diversified energy company which sells
electric energy, natural gas and alternate fuel products, risk management
consulting services and project management; and WPS Power Development, Inc.,
which develops, acquires and owns electric projects and provides services to the
electric power generation industry.

                                USE OF PROCEEDS

    Unless otherwise specified in the applicable prospectus supplement, we will
use the net proceeds we receive from the sale of the securities offered by this
prospectus and the accompanying prospectus supplement for general corporate
purposes. General corporate purposes may include the repayment of debt and
investments in or extensions of credit to our subsidiaries. It is likely,
however, that most of the securities offered pursuant to this prospectus and the
accompanying prospectus supplement will be issued in connection with the
financing of possible acquisitions or business expansion. We may invest the net
proceeds temporarily or apply the net proceeds to repay short-term debt until we
use the net proceeds for one of these stated purposes.

                                       4
<PAGE>
                       DESCRIPTION OF THE DEBT SECURITIES

    The following description of the terms of the debt securities sets forth
general terms that may apply to the debt securities. The particular terms of any
series of debt securities will be described in the prospectus supplement
relating to those debt securities.

    The debt securities will be either our senior debt securities or our
subordinated debt securities. The senior debt securities will be issued under an
indenture dated as of October 1, 1999 between us and Firstar Bank, National
Association, Cincinnati, Ohio as trustee. This indenture is referred to as the
"senior indenture". The subordinated debt securities will be issued under an
indenture to be entered into between us and the trustee named in a prospectus
supplement. This indenture is referred to as the "subordinated indenture". This
prospectus refers to the senior indenture and the subordinated indenture
together as the "indentures".

    The following is a summary of the most important provisions of the
indentures. Copies of the entire indentures are exhibits to the registration
statement of which this prospectus is a part. Section references below are to
the section in the applicable indenture. The referenced sections of the
indentures are incorporated by reference.

GENERAL

    Neither indenture limits the amount of debt securities that we may issue.
Each indenture provides that debt securities may be issued up to the principal
amount authorized by us from time to time. The senior debt securities will be
unsecured and will have the same rank as all of our other unsecured and
unsubordinated debt. The subordinated debt securities will be unsecured and will
be subordinated and junior to all senior indebtedness.

    The debt securities may be issued in one or more separate series of senior
debt securities or subordinated debt securities. The prospectus supplement
relating to the particular series of debt securities being offered will specify
the particular amounts, prices and terms of those debt securities. These terms
may include:

    - the title of the debt securities;

    - any limit on the aggregate principal amount of the debt securities of the
      series;

    - the date on which the debt securities will mature;

    - the interest rate or rates, or the method of determining those rates;

    - the date from which interest will accrue or the method for determining
      such date;

    - the interest payment dates and the regular record dates;

    - the places where payments may be made;

    - any mandatory or optional redemption provisions;

    - any sinking fund or analogous provisions;

    - the portion of principal amount of the debt security payable upon
      acceleration of maturity if other than the full principal amount;

    - any additions to the events of default or covenants included in the
      indenture under which the debt securities are issued, as described in this
      prospectus;

    - if other than U.S. dollars, the currency or currencies, or units based on
      or related to currencies, in which payments on the debt securities will be
      payable;

    - whether the debt securities will be issued in the form of a global
      security;

    - any other specific terms of the debt securities.

                                       5
<PAGE>
The debt securities will be registered debt securities and, unless otherwise
specified in the prospectus supplement, will be payable in U.S. dollars in
denominations of $1,000 or an integral multiple of $1,000.

(Sections 2.01 and 3.01)

    Some of the debt securities may be issued as original issue discount debt
securities. Original issue discount securities bear no interest or bear interest
at below-market rates and will be sold at a discount below their stated
principal amount. The applicable prospectus supplement will also contain any
special tax, accounting or other information relating to original issue discount
securities or to other kinds of debt securities that may be offered, including
debt securities linked to an index or payable in currencies other than U.S.
dollars.

EXCHANGE, REGISTRATION AND TRANSFER

    Debt securities may be transferred or exchanged at the corporate trust
office of the security registrar or at any other office or agency maintained by
us for those purposes. Except as otherwise described in a prospectus supplement,
no service charge will be payable upon the transfer or exchange of debt
securities, except for any applicable tax or governmental charge. (Section 3.05)
The designated security registrar for the senior debt securities is Firstar
Bank, National Association, located at 425 Walnut Street, Sixth Floor,
Cincinnati, Ohio 45202. The security registrar for the subordinated debt
securities will be designated in a prospectus supplement.

    In the event of any redemption of any series of debt securities, we will not
be required to:

    1.  issue, register the transfer of, or exchange, debt securities of any
       series between the opening of business 15 business days before the date
       of the mailing of the notice of redemption of the debt securities of that
       series to be redeemed and the close of business on the date of mailing of
       the relevant notice of redemption; or

    2.  register the transfer of, or exchange, any debt security selected for
       redemption, in whole or in part, except the unredeemed portion of any
       debt security being redeemed in part.

    (Section 3.05)

PAYMENT AND PAYING AGENT

    We will pay principal, interest and any premium on debt securities which are
not global securities at the office of the paying agent. We will make payment of
interest on the debt securities which are not global securities by check mailed
to the persons in whose names the debt securities are registered on days
specified in the indentures or the applicable prospectus supplement. We will
also make payments by wire transfer to a U.S. bank designated by a holder of
debt securities in an aggregate principal amount of at least $10,000,000, all of
which have the same interest payment dates, upon receipt of a written request
from the holder, on or before the record date for the payment, designating the
account to which the payment is to be made. (Section 2.05)

    If any amount payable on any debt security remains unclaimed at the end of
two years after the amount became due and payable, the paying agent will release
any unclaimed amounts to us, and the holder of the debt security will look only
to us for payment. (Section 10.07)

    The paying agent for the senior debt securities is First Bank, National
Association, located at 425 Walnut Street, Sixth Floor, Cincinnati, Ohio 45202.
The paying agent for the subordinated debt securities will be designated in the
applicable prospectus supplement.

BOOK-ENTRY SECURITIES

    We may initially issue the debt securities of any series in the form of one
or more global securities under a book-entry only system operated by a
securities depositary. Unless otherwise specified in the applicable prospectus
supplement, the Depository Trust Company ("DTC"), New York, New York, will act

                                       6
<PAGE>
as securities depositary for each series of debt securities that are issued as
fully-registered securities. The indenture trustee will register in the name of
CEDE & Co. (DTC's partnership nominee) those securities for which DTC is acting
as depositary. Individual purchases of book-entry interests in any of the debt
securities will be made in book-entry form. So long as CEDE & Co., as nominee of
DTC, is the securityholder, references in this prospectus to holders of the debt
securities or registered owners will mean CEDE & Co., rather than the owners of
beneficial ownership interests in the debt securities.

    DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law, a
member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Securities Exchange
Act of 1934. DTC holds securities that its direct participants deposit with DTC.
DTC also facilitates the settlement among DTC participants of securities
transactions such as transfers and pledges of deposited securities through
electronic computerized book-entry changes in accounts of DTC direct
participants, thereby eliminating the need for physical movement of securities
certificates. DTC direct participants include securities brokers and dealers,
banks, trust companies, clearing corporations and certain other organizations.
DTC is owned by a number of the DTC direct participants and by the New York
Stock Exchange, Inc., the American Stock Exchange, Inc., and the National
Association of Securities Dealers, Inc. Access to the DTC system is also
available to others, such as securities brokers and dealers, banks and trust
companies that clear through or maintain a custodial relationship with a DTC
direct participant, either directly or indirectly. The rules applicable to DTC
and its participants are on file with the Securities and Exchange Commission.

    Anyone desiring to purchase debt securities under the DTC system must make
these purchases by or through DTC direct participants which will receive a
credit for the debt securities on DTC's records. The direct and indirect
participants will in turn record the ownership interest of each actual purchaser
of the debt securities on the records of the direct or indirect participant. DTC
will not provide beneficial owners of the debt securities with written
confirmations of their purchases. Owners of book-entry interests should receive
from the direct or indirect participant written confirmations of their purchases
providing details of the beneficial owners transactions, as well as periodic
statements of their holdings. DTC direct and indirect participants are to effect
transfers of beneficial ownership interests by entries made on the books of the
DTC direct or indirect participants acting on behalf of the beneficial owners.
Owners of beneficial interests in the debt securities will not receive or be
entitled to receive certificates representing their ownership interests in the
debt securities, except as described below upon the discontinuance of the use of
the book-entry system.

    Principal and the redemption price of, and interest payments on the debt
securities held by or on behalf of DTC as depositary will be made to Cede & Co.,
as nominee of DTC. DTC's practice is to credit the accounts of DTC direct
participants upon DTC's receipt from the issuer or trustee of funds and
corresponding detail information on a payment date in accordance with their
respective holdings shown on the records of DTC. Payments by DTC direct and
indirect participants to owners of beneficial ownership interests in the debt
securities will be governed by standing instructions and customary practices, as
is the case with securities held for the accounts of customers in bearer form or
registered in "street name," and will be the responsibility of such DTC direct
or indirect participant and not of DTC, the indenture trustee or us, subject to
any statutory or regulatory requirements as may be in effect from time to time.
DTC is responsible for disbursing such payments to the appropriate DTC direct
participants, and those DTC direct participants, and any indirect participants,
are in turn responsible for disbursing the payment to the owners of beneficial
ownership interests.

    To facilitate subsequent transfers, the indenture trustee will register all
debt securities which DTC direct participants deposit with DTC in the name of
DTC's partnership nominee, Cede & Co. The deposit of debt securities with DTC
and their registration in the name of Cede & Co. effect no change in beneficial
ownership. DTC has no knowledge of the actual beneficial owners of the debt
securities; DTC's records reflect only the identity of the DTC direct
participants to whose accounts the debt securities are

                                       7
<PAGE>
credited, which may or may not be the beneficial owners. The participants will
remain responsible for keeping account of their holdings on behalf of their
customers.

    Conveyance of notices and other communications by DTC to DTC direct
participants, by direct participants to indirect participants, and by direct
participants and indirect participants to beneficial owners of debt securities
will be governed by arrangements among them, subject to any statutory or
regulatory requirements as may be in effect from time to time.

    The indenture trustees will send redemption notices to DTC. If we are
redeeming less than all of the debt securities within an issue, DTC's practice
is to determine by lot the amount of the interest of each direct participant in
such issue to be redeemed.

    Neither DTC nor Cede & Co. will consent or vote with respect to the debt
securities. Under its usual procedures, DTC will mail an omnibus proxy to us as
soon as possible after the record date. The omnibus proxy assigns Cede & Co.'s
consenting or voting rights to those DTC direct participants to whose accounts
the debt securities are credited on the record date (identified in a listing
attached to the omnibus proxy).

    DTC may discontinue providing its services as debt securities depositary
with respect to the debt securities at any time by giving reasonable notice to
us or the indenture trustee. Under these circumstances, in the event that a
successor securities depositary is not obtained, debt security certificates are
required to be printed and delivered.

    We may decide to discontinue use of the system of book-entry transfers
through DTC (or a successor securities depositary). In that event, we will cause
debt security certificates to be printed and delivered.

    The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that we believe to be reliable, but neither we,
the indenture trustees nor any underwriter takes any responsibility for the
accuracy of the description of DTC's business organization and procedures.

    NEITHER WE NOR THE TRUSTEES UNDER THE INDENTURES WILL HAVE ANY
RESPONSIBILITY OR OBLIGATION TO ANY DTC DIRECT OR INDIRECT PARTICIPANT OR ANY
OWNER OF A BOOK-ENTRY INTEREST OR ANY OTHER PERSON NOT SHOWN ON THE REGISTRATION
BOOKS OF THE TRUSTEES AS BEING A HOLDER OF THE DEBT SECURITIES WITH RESPECT TO:
(1) ANY DEBT SECURITIES; (2) THE ACCURACY OF ANY RECORDS MAINTAINED BY DTC OR
ANY DTC DIRECT OR INDIRECT PARTICIPANT; (3) THE PAYMENT BY DTC OR ANY DTC DIRECT
OR INDIRECT PARTICIPANT OF ANY AMOUNT DUE TO ANY OWNER OF A BOOK-ENTRY INTEREST
IN RESPECT OF THE PRINCIPAL OR REDEMPTION PRICE OF OR INTEREST ON THE DEBT
SECURITIES; (4) THE DELIVERY BY DTC OR ANY DTC DIRECT OR INDIRECT PARTICIPANT OF
ANY NOTICE TO ANY OWNER OF A BOOK-ENTRY INTEREST WHICH IS REQUIRED OR PERMITTED
UNDER THE TERMS OF THE INDENTURES TO BE GIVEN TO HOLDERS OF THE DEBT SECURITIES;
(5) THE SELECTION OF THE OWNERS OF A BOOK-ENTRY INTEREST TO RECEIVE PAYMENT IN
THE EVENT OF ANY PARTIAL REDEMPTION OF ANY SENIOR DEBT SECURITIES; OR (6) ANY
CONSENT GIVEN OR OTHER ACTION TAKEN BY DTC OR ITS NOMINEE AS HOLDER OF THE DEBT
SECURITIES.

LIMITATION ON MERGER, CONSOLIDATION AND CERTAIN SALES OF ASSETS

    We may, without the consent of the holders of the debt securities, merge
into or consolidate with any other corporation, or convey or transfer all or
substantially all of our properties and assets to another person provided that:

    1.  the successor is a corporation;

    2.  the successor expressly assumes on the same terms and conditions all the
       obligations under the debt securities and the indentures;

    3.  immediately after giving effect to the transaction, there is no default
       under the applicable indenture; and

    4.  We deliver to the trustees a certificate and an opinion of counsel
       stating that the transaction complies with the indentures. (Sections 8.01
       and 8.02)

                                       8
<PAGE>
    The remaining or acquiring corporation will take over all of our rights and
obligations under the indentures. (Section 8.03)

SATISFACTION AND DISCHARGE; DEFEASANCE

    We may be discharged from our obligations on the debt securities of any
series that have matured or will mature or be redeemed within one year if we
deposit with the trustee enough cash to pay all the principal, interest and any
premium due to the stated maturity date or redemption date of the debt
securities. (Section 4.01)

    Each indenture contains a provision that permits either (1) our discharge
from all of our obligations (subject to limited exceptions) with respect to any
series of debt securities then outstanding or (2) our release from our
obligations under covenants respecting any series of debt securities and from
the consequences of an event of default resulting from the breach of those
covenants.

    To exercise either of these two options, we must deposit in trust with the
trustee enough money to pay in full the principal, interest and premium on the
series of debt securities. This amount may be made in cash and/or U.S.
government obligations. (Sections 13.02 and 13.03) As a condition to exercising
either of the above options, we must deliver to the trustee a ruling directed to
the trustee from the Internal Revenue Service or an opinion of counsel based on
an Internal Revenue Service Ruling or a change in applicable federal income tax
law since the date of the indenture, in each case to the effect that the holders
of the debt securities will not recognize income, gain or loss for Federal
income tax purposes as a result of the action and will be subject to Federal
income tax on the same amount, in the same manner and at the same times as would
have been the case if the action had not taken place. (Section 13.04)

    If we exercise either of these options, the holders of the debt securities
of the series affected will be entitled to receive, solely from the trust fund,
payments of principal, interest and premium on the debt securities and will not
be entitled to any of the other benefits of the indenture, except for limited
provisions including our obligations respecting registration of transfer and
exchange of debt securities, replacement of lost, stolen or mutilated debt
securities, maintenance of paying agencies and holding moneys for payment in
trust. (Sections 13.02 and 13.03)

EVENTS OF DEFAULT, NOTICE AND WAIVER

    Each indenture defines an event of default with respect to any series of
debt securities as one or more of the following events:

    - our failure to pay interest on any debt security for 30 days after it is
      due;

    - our failure to pay the principal or any premium on any debt securities
      when due;

    - our failure to perform any other covenant in the debt securities of the
      series or in the applicable indenture with respect to debt securities of
      that series for 60 days after being given notice of the failure; and

    - our entering into bankruptcy or becoming insolvent.

    In addition, our failure to pay when due, subject to any applicable grace
period, any principal of, or interest on, any indebtedness for borrowed money
incurred or guaranteed by us in the aggregate principal amount of at least
$50,000,000 constitutes an event of default under the senior indenture. An event
of default for one series of debt securities is not necessarily an event of
default for any other series of debt securities. (Section 5.01)

    Each indenture requires the trustee to give the holders of a series of debt
securities notice of a default with respect to that series within 30 days unless
the default is cured or waived. However, the trustee may withhold this notice if
it determines in good faith that it is in the interest of those holders. The
trustee may not, however, withhold this notice in the case of a payment default.
(Section 6.02)

                                       9
<PAGE>
    Other than the duty to act with the required standard of care during an
event of default, a trustee is not obligated to exercise any of its rights or
powers under the indenture at the request or direction of any of the holders of
debt securities, unless the holders have offered to the trustee reasonable
indemnification. (Section 6.03) Generally, the holders of a majority in
principal amount of outstanding debt securities of any series may direct the
time, method and place of conducting any proceeding for any remedy available to
the trustee, or exercising any trust or other power conferred on the trustee.
(Section 5.12)

    If an event of default with respect to series of debt securities (other than
due to events of bankruptcy, insolvency or reorganization) occurs, the trustee
or the holders of at least 25% in aggregate principal amount of the outstanding
debt securities of that series, by notice in writing to us and to the trustee,
may declare the unpaid principal of and accrued interest on all the debt
securities of that series to be due and payable immediately and, upon any such
declaration, the debt securities of that series will become immediately due and
payable.

    If an event of default occurs due to bankruptcy, insolvency or
reorganization, all unpaid principal of and accrued interest on the outstanding
debt securities of any series will become immediately due and payable without
any declaration or other act on the part of the trustee or any holder of any
debt security of that series. (Section 5.02)

    The holders of not less than a majority of the principal amount of the
outstanding debt securities of any series may rescind a declaration of
acceleration and its consequences with respect to the debt securities of this
series if:

    - all existing events of default, other than the nonpayment of principal of
      and interest on the debt securities of that series that have become due
      solely as a result of such declaration of acceleration, have been cured or
      waived;

    - to the extent lawful, interest on overdue interest and on overdue
      principal that has become due otherwise than by reason of such
      acceleration has been paid;

    - the rescission would not conflict with any judgment or decree of a court
      of competent jurisdiction; and

    - all amounts due to the trustee under the indenture have been paid.

(Section 5.02)

    Each indenture requires us to file annually with the trustee a certificate
of our principal executive, financial or accounting officer as to the knowledge
of the officer of our compliance with all conditions and covenants under the
indenture. (Section 7.04)

MODIFICATION OF THE INDENTURES

    Together with the trustee, we may modify the indentures without the consent
of the holders for limited purposes, including adding covenants or events of
default, establishing forms or terms of debt securities, curing ambiguities and
making certain other changes which do not adversely affect the holders in any
material respect. (Section 9.01)

    Together with the trustee, we may make modifications and amendments to each
indenture with the consent of the holders of a majority in principal amount of
the outstanding debt securities of all affected series. However, without the
consent of each affected holder, no modification may:

    - change the stated maturity or interest payment date of any debt security;

    - reduce the principal, premium (if any) or rate of interest on any debt
      security;

    - change any place of payment or the currency in which any debt security is
      payable;

    - impair the right to enforce any payment after the stated maturity,
      payment, or redemption date;

                                       10
<PAGE>
    - reduce the percentage of holders of outstanding debt securities of any
      series required to consent to any modification, amendment or waiver under
      the indenture;

    - change the redemption provisions of the indenture in a manner adverse to a
      holder; or

    - change the provisions of the indenture which relate to its modification or
      amendment. (Section 9.02)

GOVERNING LAW

    The indentures and the debt securities will be governed by, and construed
under, the laws of the State of Wisconsin.

CONCERNING THE TRUSTEES

    We may from time to time maintain lines of credit, and have other customary
banking relationships, with the trustee under the senior indenture or the
trustee under the subordinated indenture.

SENIOR DEBT SECURITIES

    The senior debt securities will be unsecured and will rank equally with all
of our other unsecured and non-subordinated debt.

    Claims of creditors and any preferred shareholders of each of our
subsidiaries generally will have priority with respect to the assets and
earnings of such subsidiaries over the claims of our creditors. The senior debt
securities therefore will be effectively subordinated to creditors, including
holders of secured indebtedness, and preferred shareholders of our subsidiaries.

    Our failure to pay when due, subject to any applicable grace period, any
principal of, or interest on, any indebtedness for borrowed money incurred or
guaranteed by us in the aggregate principal amount of at least $50,000,000
constitutes an event of default under the senior indenture.

    We agree in the senior indenture that so long as any senior debt securities
are outstanding, we will own, directly or indirectly, all of the shares of
voting common stock of Wisconsin Public Service Corporation now or hereafter
issued and outstanding, unless we transfer or sell these shares in a transaction
which complies with the provisions of the senior indenture relating to our
merger, consolidation or sale of substantially all of our properties. See
"Limitation on Merger, Consolidation and Certain Sales of Assets" in this
Prospectus. (Section 10.08)

    We agree in the senior indenture that so long as any senior debt securities
are outstanding, we will not pledge or grant a security interest in, or permit
any pledge, security interest or other lien upon, any common stock of any of our
subsidiaries owned directly or indirectly by us to secure any indebtedness for
money borrowed, without making effective provision to secure the senior debt
securities equally and ratably with the other indebtedness and any other
indebtedness similarly entitled to be equally and ratably secured. This
restriction will not apply, however, to (l) the creation or existence of any
pledge, security interest, or encumbrance upon any of the common stock of our
subsidiaries (A) created at the time of our acquisition of the common stock or
within one year after our acquisition of the common stock to secure all or a
portion of the purchase price for the common stock or (B) existing on the common
stock at the time of our acquisition of it, or (2) any extension, renewal or
refunding of any pledge, security interest, or encumbrance described in clause
(1). (Section 10.09)

SUBORDINATED DEBT SECURITIES

    The subordinated debt securities will be unsecured. The subordinated debt
securities will be subordinate in right of payment to all senior indebtedness.
(Section 14.01 of Subordinated Indenture) In addition, claims of our
subsidiaries' creditors and preferred shareholders generally will have priority
with respect to the assets and earnings of the subsidiaries over the claims of
our creditors, including holders of the subordinated debt securities, even
though those obligations may not constitute senior indebtedness.

                                       11
<PAGE>
The subordinated debt securities, therefore, will be effectively subordinated to
creditors, including trade creditors, and preferred shareholders of our
subsidiaries.

    The subordinated indenture defines "senior indebtedness" to mean the
principal of, premium, if any, and interest on:

    - all of our indebtedness for money borrowed;

    - indebtedness evidenced by securities, debentures, bonds or other similar
      instruments issued by us;

    - all of our capital lease obligations;

    - all of our obligations issued or assumed as the deferred purchase price of
      property, all of our conditional sales contracts and all of our
      obligations under any title retention agreements (but excluding trade
      accounts payable arising in the ordinary course of business);

    - all of our obligations for reimbursement on any letter of credit, banker's
      acceptance, security purchase facility or similar credit transaction;

    - all obligations of the types previously described of other persons for the
      payment of which we are responsible or liable as obligor, guarantor or
      otherwise; and

    - all obligations of the types previously described of other persons secured
      by any lien on any of our property, whether or not such obligation is
      assumed by us.

    However, the term "senior indebtedness" will not include:

    - our 7.00% Junior Subordinated Deferrable Interest Debentures due 2038;

    - any indebtedness which is by its terms subordinated, to or pari passu
      with, the subordinated debt securities; or

    - any of our obligations to any of our affiliates.

    There is no limitation under either indenture on our ability to issue
additional senior indebtedness. The senior debt securities constitute senior
indebtedness under the subordinated indenture. The subordinated debt securities
will rank equally with our other subordinated indebtedness.

    Under the subordinated indenture, no payment may be made on the subordinated
debt securities, including any redemption or sinking fund payment if:

    - any of our senior indebtedness has not been paid when due and any
      applicable grace period has ended and the default has not been cured or
      waived or ceased to exist, or

    - the maturity of any senior indebtedness has been and remains accelerated
      as a result of a default.

    In the event that we pay or distribute our assets to creditors upon any
dissolution, winding-up, liquidation or reorganization of us, whether voluntary
or involuntary, the holders of senior indebtedness will be entitled to receive
payment in full of the senior indebtedness before the holders of subordinated
debt securities are entitled to receive or retain any payment. Until the senior
indebtedness is paid in full, any payment or distribution to which holders of
subordinated debt securities would be entitled but for the subordination
provisions of the subordinated indenture will be made to holders of the senior
indebtedness. (Section 14.03 of Subordinated Indenture) If a distribution is
made to holders of subordinated debt securities that, due to the subordination
provisions, should not have been made to them, those holders of subordinated
debt securities are required to pay it over to the holders of the senior
indebtedness or their representatives or trustees, as their interests may
appear. (Section 14.03 of Subordinated Indenture)

    As a result of the subordination provisions contained in the subordinated
indenture, in the event of our insolvency, our creditors who are holders of
senior indebtedness may recover more, ratably, than the holders of subordinated
debt securities.

                                       12
<PAGE>
                          DESCRIPTION OF COMMON STOCK

    We are authorized to issue up to 100,000,000 shares of capital stock
consisting of one class only, designated as "common stock" with a par value of
$1.00 per share. As of September 30, 1999, 26,780,348 shares of our common stock
were issued and outstanding.

    The outstanding shares of our common stock are, and any additional shares
which we may offer will be, listed on the New York Stock Exchange under the
symbol "WPS."

DIVIDEND AND LIQUIDATION RIGHTS

    All shares of our common stock will participate equally with respect to
dividends and rank equally upon liquidation, subject to the rights of holders of
any prior ranking stock which our shareholders may authorize in the future. In
the event of our liquidation, dissolution or winding up, the owners of our
common stock are entitled to receive pro rata the assets and funds remaining
after satisfaction of all of our creditors and payment of all amounts to which
owners of prior ranking stock, if any, then outstanding may be entitled.

VOTING RIGHTS

    Except as otherwise described in the immediately following paragraphs and
under "Certain Statutory and Other Provisions" below, every holder of our common
stock has one vote for each share.

    Our shareholders do not have cumulative voting rights. As a result, the
holders of shares entitled to exercise more than 50% of the voting power of
shares entitled to vote, represented at a meeting at which a majority of the
shares entitled to vote is represented, are entitled to elect all of the
directors to be elected at the meeting. Under our articles of incorporation and
by-laws, our board of directors is divided into three classes. One class is
elected each year for a three-year term.

PROVISIONS OF OUR ARTICLES OF INCORPORATION WITH POSSIBLE ANTI-TAKEOVER EFFECTS

    In addition to the provisions of our articles of incorporation and by-laws
dividing our board of directors into three classes, certain other provisions of
our articles of incorporation may have the effect of delaying, deferring or
preventing a change in control of our company.

    Article 5 of our articles of incorporation provides that, subject to the
exception discussed below, a director may be removed only for cause by the
affirmative vote of shareholders possessing a majority of the voting power of
the then outstanding shares of voting stock. As defined in article 5, "cause"
exists only if the director whose removal is proposed has been convicted of a
felony by a court of competent jurisdiction and such conviction is no longer
subject to direct appeal or such director has been adjudged to be liable for
negligence or misconduct in the performance of his duty to us in a matter which
has a materially adverse effect on our business, and such adjudication is no
longer subject to direct appeal. Article 5 also provides for the removal of a
director by the shareholders without cause when such removal is recommended by
the "requisite vote" of the directors and approved by the affirmative vote of
shareholders possessing a majority of the voting power of the then outstanding
shares of voting stock. Our articles of incorporation define the term "requisite
vote" as the affirmative vote of at least two-thirds of the directors then in
office plus one director. Unless "cause" is established or removal is
recommended by the requisite vote of the directors, a director may not be
removed from office even if shareholders possessing a majority of the voting
power favor such action. Additionally, pursuant to article 5, vacancies on our
board of directors, including those resulting from the removal of a director,
may be filled for the unexpired portion of the director's term by the majority
vote of the remaining members of the board.

    Article 5 of our articles of incorporation provides that those sections of
Article III of our by-laws which set forth the general powers, number,
qualifications and classification of directors may be amended or repealed only
by the affirmative vote of shareholders possessing at least 75% of the voting
power of the then outstanding shares of our common stock generally possessing
voting rights in the election of directors, or by the requisite vote of the
directors. Article 5 of our articles provides that article 5 may itself be

                                       13
<PAGE>
amended or repealed only by the affirmative vote of shareholders possessing at
least 75% of the voting power of the then outstanding shares of our common stock
generally possessing voting rights in the election of directors.

STATUTORY PROVISIONS WITH POSSIBLE ANTI-TAKEOVER EFFECTS

    Section 180.1150 of the Wisconsin Business Corporation Law provides that the
voting power of shares of an "issuing public corporation," which includes our
company, which are held by any person holding in excess of 20% of the voting
power in the election of directors of the issuing public corporation's shares
shall be limited to 10% of the full voting power of such excess shares. This
statutory voting restriction will not apply to shares acquired directly from us,
to shares acquired in a transaction incident to which our shareholders vote to
restore the full voting power of such shares, either before or after the
acquisition of the shares, and under certain other circumstances.

    Except as may otherwise be provided by law, the required affirmative vote of
shareholders of a Wisconsin corporation for certain significant corporate
actions, including a merger or share exchange with another corporation, sale of
all or substantially all of the corporate property and assets, or voluntary
liquidation, is a majority of all the votes entitled to be cast on the
transaction by each voting group of outstanding shares entitled to vote on the
transaction. Sections 180.1130 through 180.1134 of the Wisconsin Business
Corporation Law provide generally that, in addition to the vote otherwise
required by law or the articles of incorporation of an "issuing public
corporation," business combinations not meeting adequacy-of-price standards
specified in the statute must be approved by (a) the holders of at least 80% of
the votes entitled to be cast and (b) two-thirds of the votes entitled to be
cast by the corporation's outstanding voting shares owned by persons other than
a "significant shareholder" who is a party to the transaction or an affiliate or
associate of such significant shareholder. Section 180.1130 defines "business
combination" to include, subject to certain exceptions, a merger or share
exchange of the issuing public corporation or any of its subsidiaries with, or
the sale or other disposition of substantially all assets of the issuing public
corporation to, any significant shareholder or affiliate thereof. The statute
defines "significant shareholder" generally to mean a person that is the
beneficial owner of 10% or more of the voting power of the outstanding voting
shares of the issuing public corporation.

    Sections 180.1140 through 180.1145 of the Wisconsin Business Corporation Law
provides that a "resident domestic corporation," which includes our company, may
not engage in a "business combination" with an "interested stockholder" within
three years after the date on which the interested stockholder acquired his or
her 10% or greater interest, unless the corporation's board of directors
approved the business combination, or the acquisition of the 10% or greater
interest, before the stock acquisition date. The statute defines "interested
stockholder" as a person beneficially owning 10% or more the aggregate voting
power of the stock of such corporation. If the interested stockholder fails to
obtain such approval by the board of directors, then even after the three-year
period, the interested stockholder may complete a business combination with the
corporation only with the approval of the holders of a majority of the voting
stock not beneficially owned by the interested stockholder, unless the
combination satisfies certain adequacy-of-price standards intended to provide a
fair price for shares held by non-interested shareholders.

    Section 196.795 of the Wisconsin statutes states that no person may hold or
acquire directly or indirectly more than 10% of the outstanding voting
securities of a public utility holding company with the unconditional power to
vote such securities unless the Public Service Commission of Wisconsin
determines, after investigation and an opportunity for hearing, that such
holding or acquisition is in the best interests of utility customers, investors
and the public. Section 196.795 of the Wisconsin statutes applies to our
company.

    The sections of the Wisconsin law described in the preceding paragraphs and
certain provisions of our articles and by-laws, could have the effect, among
others, of discouraging takeover proposals for our company or impeding a
business combination between us and one of our major shareholders.

                                       14
<PAGE>
PREEMPTIVE RIGHTS; COMMON STOCK PURCHASE RIGHTS

    No holder of our common stock has any preemptive or subscription rights to
acquire shares of our common stock except for the common stock purchase rights
attached to each share of our common stock.

    On December 12, 1996, our board of directors approved the issuance to
shareholders as of December 16, 1996, of a dividend of one right for each
outstanding share of our common stock. A right will also attach to each share of
our common stock which we may offer pursuant to this prospectus and a prospectus
supplement. These rights are not presently exercisable, but ten days after a
person or group acquires 15% or more of our common stock or ten business days
(subject to extension) after a person or group announces a tender offer to
acquire at least 15% of our common stock, the rights will become exercisable.
These rights will entitle each holder of our common stock to purchase one share
of our authorized but unissued common stock for each right. The exercise price
of each right is $85. Upon the acquisition by any person or group of 15% or more
of our common stock, each right, other than rights held by an acquiring party,
will entitle the holder to purchase, at the exercise price, shares of our common
stock having a market value of two times the exercise price. The agreement
setting forth the terms of the rights excludes from its effect the inadvertent
acquisition of 15% or more of our common stock, provided there is prompt
divestment to less than 15%. We may redeem the rights or may, under certain
circumstances, exchange the rights for shares of our common stock, all as
provided and subject to the limitations set forth in the agreement setting forth
the terms of the rights; otherwise, such rights expire on December 11, 2006.

    The rights have anti-takeover effects. The rights will cause substantial
dilution to a person who attempts to acquire control of our company without the
prior approval of our board of directors. The rights will not affect a
transaction approved by our board of directors, because our board has the power
to redeem the rights in connection with a transaction that it approves.

CONVERSION RIGHTS, REDEMPTION PROVISIONS AND SINKING FUND PROVISIONS

    Our common stock is not convertible, is not redeemable and has no sinking
fund.

LIABILITY TO FURTHER CALLS OR TO ASSESSMENT

    The shares of our common stock which we may offer pursuant to this
prospectus and a prospectus supplement will, upon payment of the purchase price,
be fully-paid and non-assessable by us, except for certain statutory personal
liability which may be imposed upon shareholders under Section
180.0622(2)(b) of the Wisconsin Business Corporation Law. The substantially
identical predecessor to that statute has been judicially interpreted to mean
that shareholders of a Wisconsin corporation are subject to personal liability,
up to an amount equal to the consideration for which their shares were issued
(instead of the aggregate par value in the case of shares with par value, as the
statute states), for all debts owing to employees of the corporation for
services performed for the corporation, but not exceeding six months service in
any one case.

RESTRICTIONS ON DIVIDENDS PAYABLE BY WISCONSIN PUBLIC SERVICE CORPORATION

    We are a holding company, and our ability to pay dividends is largely
dependent upon the ability of our subsidiaries to pay dividends to us. The
Public Service Commission of Wisconsin has by order restricted our principal
subsidiary Wisconsin Public Service Corporation to paying normal dividends on
its common stock of no more than 109% of the previous year's common stock
dividend. The Public Service Commission of Wisconsin also requires Wisconsin
Public Service Corporation to maintain a capital structure (i.e., the
percentages by which each of common stock, preferred stock and debt constitute
the total capital invested in a utility) which has a common equity range of 50%
to 54%. Each of these limitations may be modified by a future order of the
Public Service Commission of Wisconsin. Our right to receive dividends on the
common stock of Wisconsin Public Service Corporation is also subject to the
prior rights of that corporation's preferred shareholders and to provisions in
that corporation's articles of incorporation which limit the amount of common
stock dividends which that corporation may pay if its common stock and common
stock surplus accounts constitute less than 25% of its total capitalization.

                                       15
<PAGE>
                              PLAN OF DISTRIBUTION

    We may sell the securities:

    - through underwriters,

    - through agents, or

    - directly to a limited number of institutional purchasers or to a single
      purchaser.

    The prospectus supplement will set forth the terms of the offering of the
securities, including the following:

    - the name or names of any underwriters;

    - the purchase price and the proceeds we will receive from the sale;

    - any underwriting discounts and other items constituting underwriters'
      compensation;

    - any initial public offering price and any discounts or concessions allowed
      or reallowed or paid to dealers; and

    - any securities exchanges on which the securities of the series may be
      listed.

    If underwriters are used in the sale, the securities will be acquired by the
underwriters for their own account and may be resold from time to time in one or
more transactions, including negotiated transactions, at a fixed public offering
price or at varying prices determined at the time of sale. The securities may be
either offered to the public through underwriting syndicates represented by
managing underwriters or by underwriters without a syndicate. The obligations of
the underwriters to purchase securities will be subject to conditions precedent
and the underwriters will be obligated to purchase all the securities of a
series if any are purchased. Any initial public offering price and any discounts
or concessions allowed or reallowed or paid to dealers may be changed from time
to time.

    We may sell Securities directly or through agents designated by us from time
to time. The applicable prospectus supplement will name any agent involved in
the offer or sale of the securities, and will set forth any commissions payable
by us to that agent. Unless otherwise indicated in the prospectus supplement,
any agent will be acting on a best efforts basis for the period of its
appointment.

    We may authorize agents or underwriters to solicit offers by certain types
of institutions to purchase securities from us at the public offering price set
forth in the prospectus supplement pursuant to delayed delivery contracts. These
contracts will provide for payment and delivery on a specified date in the
future. The conditions to these contracts and the commissions payable for
solicitation of such contracts will be set forth in the applicable prospectus
supplement.

    Agents and underwriters may be entitled to indemnification by us against
civil liabilities arising out of this prospectus, including liabilities under
the Securities Act of 1933, or to contribution with respect to payments which
the agents or underwriters may be required to make relating to those
liabilities. Agents and underwriters may be customers of, engage in transactions
with, or perform services for, us in the ordinary course of business.

    Each series of debt securities will be a new issue of securities with no
established trading market. Any underwriter may make a market in the securities,
but will not be obligated to do so and may discontinue any market making at any
time without notice. No assurance can be given as to the liquidity of the
trading market for any securities.

                                       16
<PAGE>
                                 LEGAL OPINIONS

    Foley & Lardner, 777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202, our
counsel, will pass upon the validity of the securities offered pursuant to this
prospectus and the prospectus supplements.

                                    EXPERTS

    The audited financial statements and schedules incorporated in this
prospectus by reference to our Annual Report on Form 10-K for the year ended
December 31, 1998 have been audited by Arthur Andersen LLP, independent public
accountants, as indicated in their reports with respect thereto and are included
in this prospectus upon the authority of said firm as experts in giving such
reports.

                                       17
<PAGE>
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    YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS SUPPLEMENT AND THE ATTACHED PROSPECTUS. WE HAVE NOT
AUTHORIZED ANYONE TO PROVIDE YOU WITH DIFFERENT INFORMATION, AND IF YOU RECEIVE
ANY UNAUTHORIZED INFORMATION YOU SHOULD NOT RELY ON IT. WE ARE NOT MAKING AN
OFFER OF THESE SECURITIES IN ANY PLACE WHERE THE OFFER IS NOT PERMITTED. YOU
SHOULD NOT ASSUME THAT THE INFORMATION CONTAINED OR INCORPORATED BY REFERENCE IN
THIS PROSPECTUS SUPPLEMENT OR THE ATTACHED PROSPECTUS IS ACCURATE AS OF ANY DATE
OTHER THAN THE DATE ON THE FRONT OF THE APPLICABLE DOCUMENT. IF INFORMATION IN
THIS PROSPECTUS SUPPLEMENT IS INCONSISTENT WITH THE PROSPECTUS, THIS PROSPECTUS
SUPPLEMENT WILL APPLY AND WILL SUPERSEDE THAT INFORMATION IN THE PROSPECTUS.

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

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                            PAGE
                                          --------
<S>                                       <C>
              PROSPECTUS SUPPLEMENT
The Company.............................    S-2
Recent Events...........................    S-2
Description Of The Notes................    S-2
Summary Financial Information...........    S-6
Book-Entry Issuance--The Depository
  Trust Company.........................    S-7
Underwriting............................    S-7
Legal Matters...........................    S-8

                    PROSPECTUS
Summary.................................      1
Where You Can Find More Information.....      3
The Company.............................      4
Use Of Proceeds.........................      4
Description Of The Debt Securities......      5
Description Of Common Stock.............     13
Plan of Distribution....................     16
Legal Opinions..........................     17
Experts.................................     17
</TABLE>

                                  $150,000,000

                           WPS RESOURCES CORPORATION

                        % SENIOR NOTES DUE NOVEMBER 1, 20

                                     [LOGO]

                           A.G. EDWARDS & SONS, INC.

                             ROBERT W. BAIRD & CO.
                                  INCORPORATED

                             LEGG MASON WOOD WALKER
                                  INCORPORATED

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