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                            FIRST SUPPLEMENTAL INDENTURE


                                        FROM


                        WISCONSIN PUBLIC SERVICE CORPORATION


                                         TO


                 FIRSTAR BANK MILWAUKEE, N.A., NATIONAL ASSOCIATION


                                      TRUSTEE

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


                            Dated as of December 1, 1998


                             SUPPLEMENTAL TO INDENTURE


                            Dated as of December 1, 1998


                               Senior Debt Securities


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          This FIRST SUPPLEMENTAL INDENTURE is made as of the 1st day of 
December, by and between WISCONSIN PUBLIC SERVICE CORPORATION, a corporation 
duly organized and existing under the laws of the State of Wisconsin (the 
"Company"), and FIRSTAR BANK MILWAUKEE, N.A., NATIONAL ASSOCIATION, a 
corporation duly organized and existing under the laws of the United States, 
as trustee (the "Trustee").

                               RECITALS OF THE COMPANY:

          WITNESSETH:  that

          The Company has heretofore executed and delivered its Indenture 
(hereinafter referred to as the "Indenture"), made as of December 1, 1998; and

          Section 3.1 of the Indenture provides that Securities may be issued 
from time to time in series pursuant to a supplemental indenture specifying 
the terms of each series of Securities; and

          The Company desires to establish a series of Securities to be 
designated "Senior Notes, 6.08% Series Due December 1, 2028" (the "Securities 
of the Series due 2028"); and

          Section 10.1 of the Indenture provides that the Company and the 
Trustee may enter into indentures supplemental thereto for the purposes, 
among others, of establishing the form or terms of Securities of any series 
and adding to the covenants of the Company; and

          The execution and delivery of this First Supplemental Indenture 
(herein, this "Supplemental Indenture") has been duly authorized by a Board 
Resolution;

          NOW, THEREFORE, this Supplemental Indenture

          WITNESSETH, that, in order to set forth the terms and conditions 
upon which Securities of the Series due 2028 are, and are to be, 
authenticated, issued and delivered, and in consideration of the sum of one 
dollar duly paid to it by the Trustee at the execution of this Supplemental 
Indenture, the receipt whereof is hereby acknowledged, the Company covenants 
and agrees with the Trustee for the equal and proportionate benefit of the 
respective Holders from time to time of such Securities as follows:

                                       1


                                     ARTICLE I
                         RELATION TO INDENTURE; DEFINITIONS

SECTION 1.1.

          This Supplemental Indenture constitutes an integral part of the 
Indenture.

SECTION 1.2.

          For all purposes of this Supplemental Indenture:

          (a)  Capitalized terms used but not otherwise defined herein shall 
have the respective meanings assigned to such terms in the Indenture;

          (b)  All references herein to Articles and Sections, unless 
otherwise specified, refer to the corresponding Articles and Sections of this 
Supplemental Indenture; and

          (c)  The terms "hereof," "herein," "hereby," "hereto," "hereunder," 
and "herewith" refer to this Supplemental Indenture.

                                    ARTICLE II
                                   THE SECURITIES

          There is hereby established a series of Securities pursuant to 
Section 3.01 of the Indenture as follows:

          (a)  The title of the Securities of the series hereby established 
is "Senior Notes, 6.08% Series Due December 1, 2028."

          (b)  The aggregate principal amount of the Securities of the Series 
due 2028 which may be authenticated and delivered under the Indenture (except 
for Securities authenticated and delivered upon registration of transfer of, 
or in exchange for, or in lieu of other Securities of such series pursuant to 
Sections 2.05, 3.04, 3.05, 3.06, 10.06 or 12.07) shall be limited to Fifty 
Million Dollars ($50,000,000).

          (c)  The Securities of the Series due 2028 are to be issued in 
permanent global form without coupons.  The beneficial owners of interests in 
such permanent Global Security or Securities may not exchange such interests 
for Securities of such series other than in the manner provided in Section 
2.05 of the Indenture.  The Depositary for the Securities of the Series due 
2028 shall be The Depositary Trust Company.

          (d)  The Stated Maturity of the Securities of the Series due 2028 
is December 1, 2028.

          (e)  The Securities of the Series due 2028 shall bear interest at 
the rate of 6.08% per annum and such interest shall accrue from December 1, 
1998 (or from the most recent Interest Payment Date to which interest on the 
Securities of the Series due 2028 has 

                                       2


been paid or provided for).  The Interest Payment Dates for the Securities of 
the Series due 2028 shall be June 1 and December 1 in each year commencing 
June 1, 1999, and the Regular Record Date for the interest payable on any 
Interest Payment Date shall be the fifteenth day (whether or not a Business 
Day) preceding such Interest Payment Date.

          (f)  Principal of and interest on the Securities of the Series due 
2028 shall be payable in U.S. Dollars at the Corporate Trust Office of the 
Trustee.

          (g)  The Securities of the Series due 2028 are subject to 
redemption in whole at any time or in part from time to time at the option of 
the Company at a Redemption Price equal to the greater of (i) 100% of the 
principal amount of the Securities of the Series due 2028 to be redeemed or 
(ii) the sum of the present values of the remaining scheduled payments of 
principal and interest thereon discounted to the Redemption Date on a 
semi-annual basis (assuming a 360 day year of twelve 30-day months) at the 
treasury yield as hereinafter defined, plus two-tenths of one percent (.20%) 
plus in each case accrued interest to the Redemption Date.  Such Redemption 
Date shall be set forth in an Officers' Certificate delivered to the Trustee 
on or before the Redemption Date and upon which the Trustee may conclusively 
rely.

          For purposes of this paragraph (g):

          "Treasury Yield" means, with respect to any Redemption Date, the 
rate per annum equal to the semiannual equivalent yield to maturity of the 
Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue 
(expressed as a percentage of its principal amount) equal to the Comparable 
Treasury Price for such Redemption Date.

          "Comparable Treasury Issue" means the United States Treasury 
security selected by an Independent Investment Banker as having a maturity 
comparable to the remaining term of the Notes that would be utilized, 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 Notes.  "Independent Investment Banker" means Salomon 
Smith Barney Inc. or, if such firm is unwilling or unable to select the 
Comparable Treasury Issue, one of the remaining Reference Treasury Dealers 
appointed by the Trustee after consultation with the Company.

          "Comparable Treasury Price" means, with respect to any Redemption 
Date, (i) 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 such 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 (ii) if such release (or any successor 
release) is not published or does not contain such prices on such business 
day, (A) the average of the Reference Treasury Dealer Quotations for such 
Redemption Date, after excluding the highest and lowest such Reference 
Treasury Dealer Quotations for such Redemption Date, or (B) if the Trustee 
obtains fewer than four such Reference Treasury Dealer Quotations, the 
average of all such Quotations. "Reference Treasury Dealer Quotations" means, 
with respect to each 

                                       3


Reference Treasury Dealer and any Redemption Date, the average, as determined 
by the Company, 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 the Company by such Reference Treasury Dealer at 5:00 p.m. on the 
third business day preceding such Redemption Date.

          "Reference Treasury Dealer" means (i) each of Salomon Smith Barney 
Inc. ("Salomon") and any other primary U.S. Government securities dealer in 
New York City (a "Primary Treasury Dealer") designated by, and not affiliated 
with, Salomon, PROVIDED, HOWEVER, that if Salomon or any of its designees 
shall cease to be a Primary Treasury Dealer, the Company shall substitute 
therefor another Primary Treasury Dealer, and (ii) any other Primary Treasury 
Dealer selected by the Company.

          (h)  The Securities of the Series due 2028 shall not be subject to 
any sinking fund and shall not be redeemable at the option of the Holders 
thereof.

          (i)  The Securities of the Series due 2028 shall initially be 
issued in whole in the form of one or more Global Securities.  If individual 
securities of the Series due 2028 are issued under the conditions specified 
in Section 2.05 of the Indenture, individual certificates will be issued in 
denominations of $1,000 or any integral multiple thereof.

          (j)  The Related Series of Collateral Bonds being delivered to the 
Trustee in connection with the issuance of the Securities of the Series due 
2028 is the Company's First Mortgage Bonds, Collateral Series A.

          Such Securities shall be initially authenticated and delivered from 
time to time upon delivery to the Trustee of the documents required by 
Section 3.1 of the Indenture, the form of Securities for the Securities of 
the Series due 2028 substantially in the form of Security attached hereto as 
Appendix I, which is incorporated herein by reference.
                                       
                                  ARTICLE III
                         TRANSFER OF COLLATERAL BONDS

          The Company hereby issues, delivers and transfers to the Trustee in 
connection with the issuance of the Securities of the Series due 2028 Fifty 
Million Dollars ($50,000,000) aggregate principal amount of a related issue 
of Collateral Bonds of the Company designated "First Mortgage Bonds, 
Collateral Series A" (each, a "Related Issue," as to the series of Securities 
it secures, and, the "Collateral Bonds"), which has been fully registered in 
the name of the Trustee in such capacity, to be held in trust for the benefit 
of the Holders from time to time of the Related Issue of Securities and, if 
such transfer does not constitute a sale of the Collateral Bonds to the 
Trustee, the Company hereby grants a perfected security interest in the 
Collateral Bonds for the benefit of such Holders, in each case as security 
for any and all obligations of the Company under the Indenture, this 
Supplemental Indenture and the Related Issue of Securities, including but not 
limited to (1) the full and prompt payment of the interest on, principal of, 
and premium, if any, on such Related Issue of Securities when and as the same 
shall become due and payable in accordance with the terms and provisions of 
the 


                                       4


Indenture and this Supplemental Indenture and such Related Issue of 
Securities, either at the Stated Maturity thereof, upon acceleration of the 
maturity thereof or upon redemption, and (2) the full and prompt payment of 
any interest on such Related Issue of Securities when and as the same shall 
become due and payable in accordance with the terms and provisions of the 
Indenture and this Supplemental Indenture and such Related Issue of 
Securities.  The Trustee shall enforce all of its rights under the First 
Mortgage Indenture as a holder of each Related Issue of Collateral Bonds 
transferred to it as provided in this Article III for the benefit of the 
Holders of the respective Related Issue of Securities and the proceeds of the 
enforcement of such rights shall be applied by the Trustee to satisfy the 
Company's obligations under the Indenture, this Supplemental Indenture, and 
such Related Issue of Securities.

          The Company shall make payments of the principal of, and premium or 
interest on each of the Collateral Bonds to the Trustee, which payments shall 
be applied by the Trustee to satisfaction of all obligations then due on the 
respective Related Issue of Securities.

          The Collateral Bonds shall not be sold or transferred by the 
Trustee until the earlier of the Release Date or the prior retirement of the 
Related Issue of Securities through redemption, repurchase or otherwise.  
Without limiting the generality of the foregoing, in no event shall the 
Collateral Bonds be sold or become the absolute property of any person in 
violation of the applicable provisions of Section 182.04(2) of the Wisconsin 
Statutes or any successor statutory provision.  The "Release Date" shall be 
the date that all First Mortgage Bonds of the Company issued and outstanding 
under the First Mortgage Indenture, other than the Collateral Bonds, have 
been retired (at, before or after the maturity thereof) through payment, 
redemption or otherwise, provided that no Default or Event of Default has 
occurred and, at such time, is continuing under the Indenture.

          A copy of the forms of Collateral Bond is attached hereto as 
Appendix II and its terms are hereby incorporated by reference herein.

                                       
                                   ARTICLE IV
                                 MISCELLANEOUS

SECTION 4.1.

          The Trustee has accepted the amendment of the Indenture effected by 
this Supplemental Indenture and agrees to execute the trust created by the 
Indenture as hereby amended, but only upon the terms and conditions set forth 
in the Indenture, including the terms and provisions defining and limiting 
the liabilities and responsibilities of the Trustee, and without limiting the 
generality of the foregoing, the Trustee shall not be responsible in any 
manner whatsoever for or with respect of any of the recitals or statements 
contained herein, all of which recitals or statements are made solely by the 
Company, or for or with respect to (a) the validity or sufficiency of this 
Supplemental Indenture or any of the terms or provisions hereof, (b) the 
proper authorization hereof by the Company by corporate action or otherwise, 
and (c) the due execution hereof by the Company.

                                       5


SECTION 4.2.

          This Supplemental Indenture shall be construed in connection with 
and as a part of the Indenture.

SECTION 4.3.

          (a)  If any provision of this Supplemental Indenture conflicts with 
another provision of the Indenture required to be included in indentures 
qualified under the Trust Indenture Act of 1939, as amended (as enacted prior 
to the date of this Supplemental Indenture), by any of the provisions of 
Sections 310 to 317, inclusive, of said act, such required provision shall 
control.

          (b)  In case any one or more of the provisions contained in this 
Supplemental Indenture or in the Securities issued hereunder should be 
invalid, illegal, or unenforceable in any respect, the validity, legality and 
enforceability of the remaining provisions contained herein and therein shall 
not in any way be affected, impaired, prejudiced or disturbed thereby.

SECTION 4.4.

          Whenever in this Supplemental Indenture either of the parties 
hereto is named or referred to, such name or reference shall be deemed to 
include the successors or assigns of such party, and all the covenants and 
agreements contained in this Supplemental Indenture by or on behalf of the 
Company or by or on behalf of the Trustee shall bind and inure to the benefit 
of the respective successors and assigns of such parties, whether so 
expressed or not.

SECTION 4.5.

          (a)  This Supplemental Indenture may be simultaneously executed in 
several counterparts, and all such counterparts executed and delivered, each 
as an original, shall constitute but one and the same instrument.

          (b)  The descriptive headings of the several Articles of this 
Supplemental Indenture were formulated, used and inserted in this 
Supplemental Indenture for convenience only and shall not be deemed to affect 
the meaning or construction of any of the provisions hereof.

                                       6


          IN WITNESS WHEREOF, WISCONSIN PUBLIC SERVICE CORPORATION has caused 
this Supplemental Indenture to be executed by its Chairman, Chief Executive 
Officer, President, Vice Chairman or a Vice President, or any other officer 
selected by the Board of Directors, and its corporate seal to be hereunto 
affixed, duly attested by its Secretary or an Assistant Secretary, and 
FIRSTAR BANK MILWAUKEE, N.A., NATIONAL ASSOCIATION, as Trustee as aforesaid, 
has caused this Supplemental Indenture to be executed by one of its 
authorized signatories, as of December 1, 1998.

                              WISCONSIN PUBLIC SERVICE
                                CORPORATION


                              By:

                                     /s/ Daniel P Bittner
                              Name:     Daniel P. Bittner
                              Title:    Senior Vice President-Finance

ATTEST:

/s/ Francis J. Kicsar
Secretary

                              FIRSTAR BANK MILWAUKEE, N.A.,
                                 NATIONAL ASSOCIATION


                              By: /s/ Amy E. Nolde
                              Name:     Amy E. Nolde
                              Title:    Assistant Vice President

ATTEST:

/s/ Yvonne Siira
Name:     Yvonne Siira
Title:    Assistant Secretary

                                       7


                                                                     APPENDIX I

CUSIP:
No.
                                                                 $__________


          THIS SECURITY IS A GLOBAL SECURITY REGISTERED IN THE NAME OF THE 
DEPOSITARY (REFERRED TO HEREIN) OR A NOMINEE THEREOF AND UNLESS AND UNTIL IT 
IS EXCHANGED IN WHOLE OR IN PART FOR THE INDIVIDUAL SECURITIES REPRESENTED 
HEREBY, THIS GLOBAL SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE 
DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY 
TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY 
OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR 
DEPOSITARY.*

          UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED 
REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY, A NEW YORK CORPORATION (55 
WATER STREET, NEW YORK, NEW YORK), TO THE TRUSTEE FOR REGISTRATION OF 
TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN 
THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED 
REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY AND ANY PAYMENT IS MADE TO 
CEDE & CO., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE 
BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE 
& CO., HAS AN INTEREST HEREIN.*





* To be included so long as Security is a Global Security.

                                       8

                                       
                     WISCONSIN PUBLIC SERVICE CORPORATION
                Senior Note, 6.08% Series Due December 1, 2028

          WISCONSIN PUBLIC SERVICE CORPORATION, a corporation duly organized 
and existing under the laws of Wisconsin (herein called the "Company," which 
term includes any successor corporation under the Indenture hereinafter 
referred to), for value received, hereby promises to pay to Cede & Co., or 
registered assigns, the principal sum of Fifty Million Dollars on December 1, 
2028 and to pay interest thereon from December 1, 1998 or from the most 
recent Interest Payment Date to which interest has been paid or duly provided 
for, semi-annually on June 1 and December 1 in each year, commencing June 1, 
1999, at the rate of 6.08% per annum, until the principal hereof is paid or 
made available for payment and (to the extent that the payment of such 
interest shall be legally enforceable) at the rate of 6.08% per annum on any 
overdue principal and premium and on any overdue installment of interest.  
The interest so payable, and punctually paid or duly provided for, on any 
Interest Payment Date will, as provided in such Indenture, be paid to the 
Person in whose name this Security (or one or more Predecessor Securities) is 
registered at the close of business on the Regular Record Date for such 
interest, which shall be the close of business on the fifteenth calendar day 
next preceding such Interest Payment Date (whether or not such day is a 
Business Day).  Any such interest not so punctually paid or duly provided for 
will forthwith cease to be payable to the Holder on such Regular Record Date 
and may either be paid to the Person in whose name this Security (or one or 
more Predecessor Securities) is registered at the close of business on a 
Special Record Date for the payment of such Defaulted Interest to be fixed by 
the Trustee, notice whereof shall be given to Holders of Securities of this 
series not less than 10 days prior to such Special Record Date, or be paid at 
any time in any other lawful manner not inconsistent with the requirements of 
any securities exchange on which the Securities of this series may be listed, 
and upon such notice as may be required by such exchange, all as more fully 
provided in said Indenture.

          Payment of the principal of (and premium, if any) and any such 
interest on this Security will be made at the office or agency of the Trustee 
maintained for that purpose, in Milwaukee, Wisconsin, in Dollars, provided, 
however, that at the option of the Company payment of interest may be made by 
wire transfer of immediately available funds into the account specified by 
the Depositary so long as this note is in the form of Global Security and 
otherwise by check mailed to the address of the Person entitled thereto as 
such address shall appear in the Security Register.

          Prior to the Release Date (as hereinafter defined), the Securities 
will be secured by First Mortgage Bonds, Collateral Series A (the "Collateral 
Bonds"), issued and delivered by the Company to the Trustee for the benefit 
of the Holders of the Securities (as defined herein), issued under the First 
Mortgage and Deed of Trust dated January 1, 1941, from the Company to First 
Wisconsin Trust Company (subsequently succeeded by Firstar Bank Milwaukee, 
N.A., National Association), Milwaukee, Wisconsin, as supplemented and 
amended by the supplemental indentures thereto (the "First Mortgage 
Indenture").  Reference is made to the First Mortgage Indenture and the 
Indenture for a description of the rights of the Trustee as 

                                       9


holder of the Collateral Bonds, the property mortgaged and pledged under the 
First Mortgage Indenture, the rights of the Company and of the Mortgage 
Trustee in respect thereof, the duties and immunities of the applicable 
Mortgage Trustee, the terms and conditions upon which the Collateral Bonds 
are held by the Trustee for the benefit of the Holders of Securities, and the 
circumstances under which additional First Mortgage Bonds may be issued.

          FROM AND AFTER SUCH TIME AS ALL FIRST MORTGAGE BONDS (OTHER THAN 
COLLATERAL BONDS) ISSUED UNDER THE FIRST MORTGAGE INDENTURE HAVE BEEN RETIRED 
THROUGH PAYMENT, REDEMPTION OR OTHERWISE (INCLUDING THOSE FIRST MORTGAGE 
BONDS THE PAYMENT FOR WHICH HAS BEEN PROVIDED FOR IN ACCORDANCE WITH THE 
FIRST MORTGAGE INDENTURE) AT, BEFORE OR AFTER THE MATURITY THEREOF AND 
PROVIDED THAT NO DEFAULT OR EVENT OF DEFAULT UNDER THE INDENTURE HAS OCCURRED 
AND IS CONTINUING (THE "RELEASE DATE"), THE COLLATERAL BONDS SHALL CEASE TO 
SECURE THE SECURITIES IN ANY MANNER, AND, AT THE OPTION OF THE COMPANY, THE 
SECURITIES EITHER (a) WILL BECOME UNSECURED GENERAL OBLIGATIONS OF THE 
COMPANY OR (b) WILL BE SECURED BY FIRST MORTGAGE BONDS ISSUED UNDER AN 
INDENTURE OTHER THAN THE FIRST MORTGAGE INDENTURE.  IN CERTAIN CIRCUMSTANCES 
PRIOR TO THE RELEASE DATE AS PROVIDED IN THE INDENTURE, THE COMPANY IS 
PERMITTED TO REDUCE THE AGGREGATE PRINCIPAL AMOUNT OF AN ISSUE OF COLLATERAL 
BONDS HELD BY THE TRUSTEE, BUT IN NO EVENT PRIOR TO THE RELEASE DATE TO AN 
AMOUNT LESS THAN THE AGGREGATE PRINCIPAL AMOUNT OUTSTANDING OF THE RELATED 
ISSUE OF SECURITIES INITIALLY ISSUED CONTEMPORANEOUSLY WITH SUCH COLLATERAL 
BONDS.

          Reference is hereby made to the further provisions of this Security 
set forth on the reverse hereof, which further provisions shall for all 
purposes have the same effect as if set forth at this place.

          Unless the certificate of authentication hereon has been executed 
by the Trustee referred to on the reverse hereof by manual signature, this 
Security shall not be entitled to any benefit under the Indenture or be valid 
or obligatory for any purpose.

          IN WITNESS WHEREOF, the Company has caused this instrument to be 
duly executed under its corporate seal.


                              WISCONSIN PUBLIC SERVICE CORPORATION

                                   By
                                      --------------------------------

Attest:
                                               [SEAL]
- ------------------------

                                       10


                  Form of Trustee's Certificate of Authentication.

Dated:  _______________

          This is one of the Securities of the series designated therein 
referred to in the within-mentioned Indenture.

                                                                     As Trustee


                                          By
                                        ---------------------------------------
                                                           Authorized Signatory

                                       
                          FORM OF REVERSE OF SECURITY.

          This Security is one of a duly authorized issue of securities of 
the Company (herein called the "Securities"), issued and to be issued in one 
or more series under an Indenture, dated as of December 1, 1998 (herein 
called the "Indenture"), between the Company and Firstar Bank Milwaukee, 
N.A., National Association, as Trustee (herein called the "Trustee," which 
term includes any successor trustee under the Indenture), to which Indenture 
and all indentures supplemental thereto reference is hereby made for a 
statement of the respective rights, limitations of rights, duties and 
immunities thereunder of the Company, the Trustee and the Holders of the 
Securities and of the terms upon which the Securities are, and are to be, 
authenticated and delivered.  This Security is one of the series designated 
on the face hereof, limited in aggregate principal amount to $50,000,000.

          The Securities of this series are subject to redemption upon not 
less than 30 nor more than 45 days' notice by first class mail, in whole at 
any time or in part from time to time at the option of the Company at a 
Redemption Price equal to the greater of (i) 100% of the principal amount of 
the Securities of this series to be redeemed or (ii) the sum of the present 
values of the remaining scheduled payments of principal and interest thereon 
discounted to the Redemption Date on a semiannual basis (assuming a 360 day 
year consisting of twelve 30-day months) at the Treasury Yield (as defined in 
the First Supplemental Indenture to the Indenture) plus two-tenths of one 
percent (.20%), plus in each case accrued and unpaid interest to the 
Redemption Date.

          In the event of redemption of this Security in part only, a new 
Security or Securities of this series for the unredeemed portion hereof will 
be issued in the name of the Holder hereof upon the cancellation hereof.

                                       11


          If any Event of Default with respect to Securities of this series 
shall occur and be continuing, the principal of the Securities of this series 
may be declared due and payable in the manner and with the effect provided in 
the Indenture.  Upon payment (i) of the amount of principal so declared due 
and payable and (ii) of interest on any overdue principal and overdue 
interest (in each case to the extent that the payment of such interest shall 
be legally enforceable), all of the Company's obligations in respect of the 
payment of the principal of and interest, if any, on the Securities of this 
series shall terminate.

          This Security is subject to Defeasance as described in the Indenture.

          The Indenture may be modified by the Company and the Trustee 
without consent of any Holder with respect to certain matters as described in 
the Indenture.  In addition, the Indenture permits, with certain exceptions 
as therein provided, the amendment thereof and the modification of the rights 
and obligations of the Company and the rights of the Holders of the 
Securities of each series to be affected under the Indenture at any time by 
the Company and the Trustee with the consent of the Holders of a majority in 
principal amount of the Securities at the time Outstanding of each series to 
be affected.  The Indenture also contains provisions permitting the Holders 
of a majority in principal amount of the Securities of each series at the 
time Outstanding, on behalf of the Holders of all Securities of such series, 
to waive certain past defaults under the Indenture and their consequences.  
Any such consent or waiver by the Holder of this Security shall bind such 
Holder and all future Holders of this Security and of any Security issued 
upon the registration of transfer hereof or in exchange hereof or in lieu 
hereof, whether or not notation of such consent or waiver is made upon this 
Security.

          No reference herein to the Indenture and no provision of this 
Security or of the Indenture shall alter or impair the obligation of the 
Company, which is absolute and unconditional, to pay the principal of (and 
premium, if any) and interest on this Security at the times, place and rate, 
and in the coin or currency, herein prescribed.

          As provided in the Indenture and subject to certain limitations 
therein set forth, the transfer of this Security is registrable in the 
Security Register, upon surrender of this Security for registration of 
transfer at the office or agency of the Company in any place where the 
principal of (and premium, if any) and interest on this Security are payable, 
duly endorsed by, or accompanied by a written instrument of transfer in form 
satisfactory to the Company and the Security Registrar duly executed by the 
Holder hereof or his attorney duly authorized in writing, and thereupon one 
or more new Securities of this series, of authorized denominations and for 
the same Stated Maturity and aggregate principal amount, will be issued to 
the designated transferee or transferees.

          The Securities of this series are issuable only in registered form 
without coupons in denominations of $1,000 and any integral multiple thereof. 
As provided in the Indenture and subject to certain limitations therein set 
forth, Securities of this series are exchangeable for a like aggregate 
principal amount of Securities of this series of a different authorized 
denomination, as requested by the Holder surrendering the same.

                                       12


          No service charge shall be made for any such registration of 
transfer or exchange, but the Company may require payment of a sum sufficient 
to cover any tax or other governmental charge payable in connection therewith.

          Prior to due presentment of this Security for registration of 
transfer, the Company, the Trustee and any agent of the Company or the 
Trustee may treat the Person in whose name this Security is registered as the 
owner hereof for all purposes, whether or not this Security be overdue, and 
neither the Company, the Trustee nor any such agent shall be affected by 
notice to the contrary.

          The Indenture imposes certain limitations on the ability of the 
Company to, among other things, merge or consolidate with any other Person or 
sell, assign, transfer or lease all or substantially all of its properties or 
assets.  All such covenants and limitations are subject to a number of 
important qualifications and exceptions.  The Company must report 
periodically to the Trustee on compliance with the covenants in the Indenture.

          A director, officer, employee or shareholder, as such, of the 
Company shall not have any liability for any obligations of the Company under 
this Security or the Indenture or for any claim based on, in respect of, or 
by reason of, such obligations or their creation.  Each Holder, by accepting 
a Security, waives and releases all such liability.  The waiver and release 
are part of the consideration for the issuance of this Security.

          Pursuant to a recommendation promulgated by the Committee on 
Uniform Security Identification Procedures ("CUSIP"), the Company has caused 
CUSIP numbers to be printed on the Securities of this series as a convenience 
to the Holders of the Securities of this series.  No representation is made 
as to the correctness or accuracy of such numbers as printed on the 
Securities of this series and reliance may be placed only on the other 
identification numbers printed hereon.

          All capitalized terms used in this Security without definition 
which are defined in the Indenture shall have the meanings assigned to them 
in the Indenture.

                                       13


                                 ASSIGNMENT FORM

          To assign this Security, fill in the form below:  (I) or (we) 
assign and transfer this Security to
                                       
             (Insert assignee's social security or tax I.D. number)




            (Print or type assignee's name, address and zip code)

and irrevocably appoint _______________________________________________ agent 
to transfer this Security on the books of the Company.  The agent may 
substitute another to act for him.

Dated:_______________________ Your Signature:_________________________________
                                               (Sign exactly as your
                                               name appears on the other
                                               side of this Security)

Signature Guaranty:____________________________________________________
                   [Signatures must be guaranteed by an "eligible
                   guarantor institution" meeting the requirements of the
                   Transfer Agent, which requirements will include
                   membership or participation in STAMP or such other
                   signature guarantee program as may be determined by the
                   Transfer Agent in addition to, or in substitution for,
                   STAMP, all in accordance with the Exchange Act.]

Social Security Number or Taxpayer Identification
Number:_______________________________________


                                       14


                                                                    APPENDIX II


                                                               Principal Amount

No.  R-                                                          $___________

                                       
                    (Form of Bond of Collateral Series A)

                     WISCONSIN PUBLIC SERVICE CORPORATION


           (Incorporated under the laws of the State of Wisconsin)
                  First Mortgage Bond, Collateral Series A


THE FIRST MORTGAGE BONDS, COLLATERAL SERIES A (HEREINAFTER, "COLLATERAL 
BONDS"), REPRESENTED BY THIS CERTIFICATE ARE BEING ISSUED AND DELIVERED BY 
THE COMPANY TO FIRSTAR BANK MILWAUKEE, N.A., NATIONAL ASSOCIATION AS TRUSTEE 
(IN SUCH CAPACITY, THE "SENIOR TRUSTEE") UNDER AN INDENTURE, DATED AS OF 
DECEMBER 1, 1998, BETWEEN THE COMPANY AND THE SENIOR TRUSTEE, AS SUPPLEMENTED 
BY THE FIRST SUPPLEMENTAL INDENTURE THERETO DATED AS OF DECEMBER 1, 1998 (AS 
SO SUPPLEMENTED, THE "SENIOR INDENTURE").  THE COLLATERAL BONDS ARE TO BE 
HELD IN TRUST AS COLLATERAL FOR THE BENEFIT OF THE HOLDERS OF $50,000,000 
AGGREGATE PRINCIPAL AMOUNT OF SENIOR NOTES, 6.08% SERIES DUE DECEMBER 1, 2028 
(THE "RELATED SECURITIES") ISSUED PURSUANT TO THE SENIOR INDENTURE.

THE COLLATERAL BONDS MAY NOT BE SOLD OR OTHERWISE TRANSFERRED (EXCEPT TO A 
SUCCESSOR SENIOR TRUSTEE) UNTIL THE EARLIER OF THE RELEASE DATE (AS DEFINED 
BELOW) OR THE PRIOR RETIREMENT OF THE RELATED SECURITIES THROUGH REDEMPTION, 
REPURCHASE OR OTHERWISE.

THE COMPANY SHALL MAKE PAYMENTS OF THE PRINCIPAL OF, AND PREMIUM, IF ANY, AND 
INTEREST ON, THE COLLATERAL BONDS, TO THE SENIOR TRUSTEE, WHICH PAYMENTS 
SHALL BE APPLIED BY THE SENIOR TRUSTEE TO THE SATISFACTION OF OBLIGATIONS ON 
THE RELATED SECURITIES.

THE MATURITY DATE SPECIFIED ABOVE IS ALSO THE MATURITY DATE OF THE RELATED 
NOTES.

          WISCONSIN PUBLIC SERVICE CORPORATION, a corporation organized and 
existing under the laws of the State of Wisconsin (hereinafter called the 
Company), for value received, 

                                       15


hereby promises to pay to FIRSTAR BANK MILWAUKEE, N.A., NATIONAL ASSOCIATION, 
as trustee for the benefit of the holders of Related Securities, or 
registered assigns (in such capacity, the "Senior Trustee"), on the 1st day 
of December, 2028, the sum of _____________________ DOLLARS ($___________) in 
lawful money of the United States of America, and to pay interest thereon 
from the date hereof at the rate of six and eight hundredths per cent (6.08%) 
per annum, in like money, until the principal hereof becomes due and payable, 
said interest being payable on the 1st day of June and on the 1st day of 
December in each year commencing June 1, 1999.  The principal and interest so 
payable on any June 1 or December 1 will be paid to the person or entity in 
whose name this bond is registered, at the address thereof as it appears on 
the Company's books for registration and registration of transfer.

          The provisions of this bond are continued on the reverse hereof or 
attached pages and such continued provisions shall for all purposes have the 
same effect as though fully set forth at this place.

          This bond shall not be valid or become obligatory for any purpose 
unless and until Firstar Bank Milwaukee, N.A., National Association 
(successor to First Wisconsin Trust Company), as Trustee under the Indenture, 
or its successors thereunder, shall have signed the certificate of 
authentication endorsed hereon.

          IN WITNESS WHEREOF, WISCONSIN PUBLIC SERVICE CORPORATION has caused 
this bond to be signed in its name by the manual or facsimile signature of 
its President or a Vice President and its corporate seal or a facsimile 
thereof to be hereto affixed and attested by the manual or facsimile 
signature of its Secretary or an Assistant Secretary.

Dated as of:


                              WISCONSIN PUBLIC SERVICE CORPORATION,



                              By:
                                        ______ President
Attest:

_____________________________
____________ Secretary

                                       16

                                       
                        (FORM OF TRUSTEE'S CERTIFICATE)

          This bond is one of the bonds of the series designated therein, 
described in the within mentioned Indenture and Supplemental Indenture.


                              FIRSTAR BANK MILWAUKEE, N.A.,
                                  NATIONAL ASSOCIATION,
                                      As Trustee
   

                              By:
                                  --------------------------------
                                        Authorized Signature

                                       
          (TEXT APPEARING ON REVERSE SIDE OF BOND OR ATTACHED PAGES)

          This bond is one of a duly authorized issue of bonds of the 
Company, known as its First Mortgage Bonds, of the Series and designation 
indicated on the face hereof, which issue of bonds consists, or may consist, 
of several series of varying denominations, dates and tenors, all issued and 
to be issued under and equally secured (except in so far as a sinking fund, 
or similar fund, established in accordance with the provisions of the 
Indenture, may afford additional security for the bonds of any specific 
series) by a First Mortgage and Deed of Trust (herein called the "Indenture") 
dated as of January 1, 1941, executed by the Company to First Wisconsin Trust 
Company (subsequently succeeded by Firstar Bank Milwaukee, N.A., National 
Association, herein called the Trustee), as Trustee, to which Indenture and 
all instruments supplemental thereto reference is hereby made for a 
description of the property mortgaged and pledged, the nature and extent of 
the security, the rights of the holders of the bonds as to such security, and 
the terms and conditions upon which the bonds may be issued under the 
Indenture and any instruments supplemental thereto and are secured.  The 
principal hereof may be declared or may become due on the conditions, in the 
manner and at the time set forth in the Indenture, upon the happening of a 
completed default as in the Indenture provided.  This bond is one of a series 
created by a Supplemental Indenture (herein called the "Supplemental 
Indenture") dated as of December 1, 1998, between the Company and the 
Trustee, which is supplemental to the Indenture.

          The Senior Trustee has agreed pursuant to the Senior Indenture to 
hold the Bonds of this Series as collateral for the benefit of the holders of 
the Related Securities under all circumstances and not to transfer (except to 
a successor trustee) such Bonds until the earlier of the Release Date or the 
prior retirement of the Related Securities through redemption, repurchase or 
otherwise.  "Release Date" means the date on which all First Mortgage Bonds 
of the Company issued and outstanding under the Indenture, other than the 
Bonds of this Series and other Bonds pledged as security for Securities 
issued under the Senior Indenture (collectively "Collateral Bonds"), have 
been retired (at, before or after the maturity thereof) 

                                       17


through payment, redemption or otherwise provided that no default or event of 
default has occurred and is continuing under the Senior Indenture.  On the 
Release Date, the Senior Trustee shall deliver to the Company for 
cancellation all Collateral Bonds, and the Company shall cause the Senior 
Trustee to provide notice to all holders of Related Securities of the 
occurrence of the Release Date.  As a result, on the Release Date, the Bonds 
of this Series shall cease to secure the Related Securities. Following the 
Release Date, the Company shall cause the Indenture to be discharged, and the 
Company shall not issue any additional Collateral Bonds thereunder, and from 
and after the Release Date, the Company's obligations in respect of the 
Collateral Bonds shall be satisfied and discharged.

          With the consent of the Company and to the extent permitted by and 
as provided in the Indenture and/or any instruments supplemental thereto, the 
rights and obligations of the Company and/or of the holders of the bonds, 
and/or terms and provisions of the Indenture and/or of any instruments 
supplemental thereto may be modified or altered by consent of the holders of 
at least seventy percent (70%) in principal amount of the bonds then 
outstanding under the Indenture and any instruments supplemental thereto 
(excluding bonds challenged and disqualified from voting by reason of the 
interest of the Company or of certain related persons therein as provided in 
the Indenture); provided that no such modification or alteration shall permit 
the extension of the maturity of the principal of this bond or the reduction 
in the rate of interest hereon or any other modification in the terms of 
payment of such principal or interest or the taking of certain other action 
as more fully set forth in the Indenture without the consent of the holder 
hereof.

          The Company and the Trustee may deem and treat the person in whose 
name this bond is registered as the absolute owner hereof for the purpose of 
receiving payment of or on account of the principal hereof and interest 
hereon and for all other purposes, and shall not be affected by any notice to 
the contrary.

          The bonds of this Series are subject to redemption, prior to 
maturity, at the option of the Company in whole at any time or in part from 
time to time, upon payment of a redemption price equal to the greater of (i) 
100% of the principal amount of the bonds to be redeemed or (ii) the sum of 
the present values of the remaining scheduled payments of principal and 
interest thereon discounted to the redemption date on a semiannual basis 
(assuming a 360 day year consisting of twelve 30-day months) at the Treasury 
Yield (as defined in the Supplemental Indenture) plus two-tenths of one 
percent (.20%), plus in each case accrued interest thereon to the redemption 
date, all subject to the conditions and as more fully set forth in the 
Indenture and the Supplemental Indenture.

          Notice of any such redemption shall be hand delivered or mailed not 
less than thirty (30) days prior to the redemption date to the registered 
owner of the bonds so to be redeemed, at its address as the same shall appear 
on the Company's books for registration and registration of transfer, all 
subject to the conditions and as more fully set forth in the Indenture and in 
the Supplemental Indenture, except that no newspaper publication shall be 
required.

                                       18


          In the event that an event of default under Section 6.01 of the 
Senior Indenture has occurred and is continuing, and the Senior Trustee has 
declared the principal of all of the Related Securities then outstanding 
immediately due and payable (or such principal has become ipso facto 
immediately due and payable) under Section 6.02 of the Senior Indenture, then 
the Company shall call for redemption and redeem all of the bonds of this 
series then outstanding at a price equal to 100% of the principal amount 
thereof, together with accrued interest thereon to the redemption date.  The 
redemption date shall be the accelerated maturity date of the Related 
Securities, and no prior notice of such redemption to the Trustee or the 
Senior Trustee shall be required.

          This bond is nontransferable except to the Senior Trustee and 
successor trustees thereto.  To the extent that it is transferable, it is 
transferable by the registered owner hereof in person or by attorney duly 
authorized in writing, on books of the Company to be kept for that purpose at 
the principal office of the Trustee at Milwaukee, Wisconsin, upon surrender 
hereof for cancellation at said office and upon presentation of a written 
instrument of transfer duly executed.  Thereupon the Company shall issue in 
the name of the transferee, and the Trustee shall authenticate and deliver, a 
new registered bond or bonds without coupons of the same maturity and 
interest rate and of equal aggregate principal amount.  Any such transfer 
shall be subject to the terms and conditions specified in the Indenture and 
the Supplemental Indenture.

          No recourse shall be had for the payment of principal of, premium, 
if any, or interest on this bond, or any part thereof, or of any claim based 
hereon or in respect hereof or of the Indenture or any instrument 
supplemental thereto, against any incorporator, or any past, present or 
future stockholder, officer or director of the Company or of any predecessor 
or successor corporation, either directly or through the Company, or through 
any such predecessor or successor corporation, or through any receiver or a 
trustee in bankruptcy, whether by virtue of any constitution, statute or rule 
of law or by the enforcement of any assessment or penalty or otherwise, all 
such liability being, by the acceptance hereof and as a part of the 
consideration for the issue hereof, expressly waived and released, as more 
fully provided in the Indenture.

                               (END OF TEXT OF BOND)

                                       19