WISCONSIN PUBLIC SERVICE CORP
8-K, 1998-12-18
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>


                         SECURITIES AND EXCHANGE COMMISSION

                              Washington, D.C.  20549

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

                                      FORM 8-K

                                   CURRENT REPORT


                         Pursuant to Section 13 or 15(d) of
                        the Securities Exchange Act of 1934

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

          Date of Report
          (Date of earliest
          event reported):    December 14, 1998



                        Wisconsin Public Service Corporation
               ------------------------------------------------------
               (Exact name of registrant as specified in its charter)


           Wisconsin                    1-3016                39-0715160
        ---------------            ----------------       ------------------
        (State or other            (Commission File          (IRS Employer
        jurisdiction of                 Number)           Identification No.)
         incorporation)

          700 North Adams Street, P.O. Box 19001, Green Bay, WI  54307
          ------------------------------------------------------------
           (Address of principal executive offices including zip code)


                                 (920) 433-1466
                         -------------------------------
                         (Registrant's telephone number)


                                 Not Applicable
                                 --------------
          (Former name or former address, if changed since last report)

<PAGE>

ITEM 5.        OTHER EVENTS

          (a)  UNDERWRITING AGREEMENT.  The Registrant has entered into an
     underwriting agreement with Salomon Smith Barney Inc., A.G. Edwards & Sons,
     Inc. and Legg Mason Wood Walker, Incorporated (the "Underwriting
     Agreement") in connection with the offering of Senior Notes, 6.08% Series
     due December 1, 2028 (the "Senior Notes"), registered with the Securities
     and Exchange Commission on Form S-3 (Reg. No. 333-67979).  The Underwriting
     Agreement is filed herewith as Exhibit 1.

          (b)  INDENTURE.  The Registrant entered into an Indenture and First
     Supplemental Indenture with Firstar Bank Milwaukee, N.A., National
     Association, as trustee, in connection with the offering of the Senior
     Notes.  Copies of the Indenture and First Supplemental Indenture are filed
     herewith as Exhibits 4A and 4C, respectively.

          (c)  THIRTY-THIRD SUPPLEMENTAL INDENTURE.  The Registrant has entered
     into a Thirty-Third Supplemental Indenture with Firstar Bank Milwaukee,
     N.A., National Association, as successor trustee, in connection with the
     issuance of the Registrant's First Mortgage Bonds, Collateral Trust A,
     which are being pledged as security for the Senior Notes.  A copy of the
     Thirty-Third Supplemental Indenture is filed herewith as Exhibit 4D.

ITEM 7.        FINANCIAL STATEMENTS AND EXHIBITS


          (c)  EXHIBITS.

          1    Underwriting Agreement, dated as of December 14, 1998 between
               Wisconsin Public Service Corporation and Salomon Smith Barney
               Inc., A.G. Edwards & Sons, Inc. and Legg Mason Wood Walker,
               Incorporated.

          4A   Indenture, dated as of December 1, 1998, between Wisconsin 
               Public Service Corporation and Firstar Bank Milwaukee, N.A., 
               National Association.

          4C   First Supplemental Indenture, dated as of December 1, 1998
               between Wisconsin Public Service Corporation and Firstar Bank
               Milwaukee, N.A., National Association.

          4D   Thirty-Third Supplemental Indenture, dated as of December 1,
               1998, between Wisconsin Public Service Corporation and Firstar
               Bank Milwaukee, N.A., National Association.

                                      -2-
<PAGE>

                                     SIGNATURES

               Pursuant to the requirements of the Securities Exchange Act of
     1934, the Registrant has duly caused this report to be signed on its behalf
     by the undersigned hereunto duly authorized.


                                         WISCONSIN PUBLIC SERVICE CORPORATION




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

Date:     December 17, 1998

                                      -3-
<PAGE>


                                  EXHIBIT INDEX


1    Underwriting Agreement, dated as of December 14, 1998 between Wisconsin
     Public Service Corporation and Salomon Smith Barney Inc., A.G. Edwards &
     Sons, Inc. and Legg Mason Wood Walker, Incorporated.

4A   Indenture, dated as of December 1, 1998, between Wisconsin Public Service
     Corporation and Firstar Bank Milwaukee, N.A., National Association.

4C   First Supplemental Indenture, dated as of December 1, 1998 between
     Wisconsin Public Service Corporation and Firstar Bank Milwaukee, N.A.,
     National Association.

4D   Thirty-Third Supplemental Indenture, dated as of December 1, 1998, between
     Wisconsin Public Service Corporation and Firstar Bank Milwaukee, N.A.,
     National Association.


                                      -4-

<PAGE>

                         Wisconsin Public Service Corporation

                       6.08% Senior Notes Due December 1, 2028

                            Form of Underwriting Agreement

                                                             New York, New York
                                                              December 14, 1998

To the Representatives
  named in Schedule I
  hereto of the Under-
  writers named in
  Schedule II hereto

Ladies and Gentlemen:

          Wisconsin Public Service Corporation, a corporation organized under 
the laws of Wisconsin (the "Company"), proposes to sell to the several 
underwriters named in Schedule II hereto (the "Underwriters"), for whom you 
(the "Representatives") are acting as representatives, the principal amount 
of its senior debt securities identified in Schedule I hereto (the "Senior 
Notes"), to be issued under an Indenture dated as of December 1, 1998, 
between the Company and Firstar Bank Milwaukee, N.A., as trustee (the "Senior 
Trustee"), as supplemented by the First Supplemental Indenture dated as of 
December 1, 1998, creating the series in which the Senior Notes are to be 
issued, a form of which is included as an exhibit to the Registration 
Statement (the "Supplemental Indenture to the Senior Indenture").   The term 
"Senior Indenture," as used herein, means such Indenture dated as of  
December 1, 1998 , as supplemented  by the Supplemental Indenture to the 
Senior Indenture. To the extent there are no additional Underwriters listed 
on Schedule I other than you, the term Representatives as used herein shall 
mean you, as Underwriters, and the terms Representatives and Underwriters 
shall mean either the singular or plural as the context requires.

          Until the Release Date (as defined in the Senior Indenture),  the 
Senior Notes will be secured as to payment of principal and interest by the 
Company's First Mortgage Bonds, Collateral Series A (the "Collateral Bonds"), 
issued under and ratably secured by the First Mortgage and Deed of Trust 
dated January 1, 1941 between the Company and Firstar Bank Milwaukee, N.A. 
(the successor  to First Wisconsin Trust Company), as Trustee (the "Mortgage 
Trustee"), as amended and supplemented to the Execution Time (as so amended 
and supplemented, the "Original Mortgage Indenture") and to be further 
supplemented by the Thirty-Third Supplemental Indenture thereto, a form of 
which is included in the Registration Statement, creating the Collateral 
Bonds (the

                                       
<PAGE>

"Supplemental Indenture to the Mortgage Indenture").  The term "Mortgage 
Indenture," as used herein, means the Original Mortgage Indenture, as 
supplemented by the Supplemental Indenture to the Mortgage Indenture.  The 
Collateral Bonds will be issued, pledged and delivered to the Senior Trustee 
by the Company concurrently with the issue and delivery of the Senior Notes.

          Any reference herein to the Registration Statement, the Basic 
Prospectus, any Preliminary Final Prospectus or the Final Prospectus shall be 
deemed to refer to and include the documents incorporated by reference 
therein pursuant to Item 12 of Form S-3 which were filed under the Exchange 
Act on or before the Effective Date of the Registration Statement or the 
issue date of the Basic Prospectus, any Preliminary Final Prospectus or the 
Final Prospectus, as the case may be; and any reference herein to the terms 
"amend", "amendment" or "supplement" with respect to the Registration 
Statement, the Basic Prospectus, any Preliminary Final Prospectus or the 
Final Prospectus shall be deemed to refer to and include the filing of any 
document under the Exchange Act after the Effective Date of the Registration 
Statement or the issue date of the Basic Prospectus, any Preliminary Final 
Prospectus or the Final Prospectus, as the case may be, deemed to be 
incorporated therein by reference.  Certain terms used herein are defined in 
Section 17 hereof.  Capitalized terms used herein and not otherwise defined 
have the meaning given such terms in the Senior Indenture.

          1.   REPRESENTATIONS AND WARRANTIES.  The Company represents and 
warrants to, and agrees with, each Underwriter as set forth below in this 
Section 1.

          (a)  The Company meets the requirements for use of Form S-3 under 
     the Act and has prepared and filed with the Commission a registration 
     statement (the file number of which is set forth in Schedule I hereto) 
     on Form S-3, including a related basic prospectus, for registration 
     under the Act of the offering and sale of the Senior Notes.  The Company 
     may have filed one or more amendments thereto, including a Preliminary 
     Final Prospectus, each of which has previously been furnished to you.  
     The Company will next file with the Commission one of the following: (1) 
     after the Effective Date of such registration statement, a final 
     prospectus supplement relating to the Senior Notes in accordance with 
     Rules 430A and 424(b), (2) prior to the Effective Date of such 
     registration statement, an amendment to such registration statement 
     (including the form of final prospectus supplement), or (3) a final 
     prospectus in accordance with Rules 415 and 424(b).  In the case of 
     clause (1), the Company has included in such registration statement, as 
     amended at the Effective Date, all information (other than Rule 430A 
     Information) required by the Act and the rules thereunder to be included 
     in such registration statement and the Final Prospectus.  As filed, such 
     final prospectus supplement or such amendment and form of final 
     prospectus supplement shall contain all Rule 430A Information, together 
     with all other such required information, and, except to the extent the 
     Representatives shall agree in writing to a modification, shall be in 
     all substantive respects in the form furnished to you prior to the 
     Execution Time or, to the extent not completed at the Execution Time, 
     shall contain only such specific additional information and other 
     changes (beyond that contained in the Basic Prospectus and any 
     Preliminary Final Prospectus) as the Company has advised you, prior to 
     the Execution Time, 

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<PAGE>


     will be included or made therein. The Registration Statement, at the 
     Execution Time, meets the requirements set forth in Rule 415(a)(1)(x).

          (b)  On the Effective Date, the Registration Statement did or will, 
     and when the Final Prospectus is first filed (if required) in accordance 
     with Rule 424(b) and on the Closing Date (as defined herein), the Final 
     Prospectus (and any supplement thereto) will, comply in all material 
     respects with the applicable requirements of the Act, the Exchange Act 
     and the Trust Indenture Act and the respective rules thereunder; on the 
     Effective Date and at the Execution Time, the Registration Statement did 
     not or will not contain any untrue statement of a material fact or omit 
     to state any material fact required to be stated therein or necessary in 
     order to make the statements therein not misleading; on the Effective 
     Date and on the Closing Date the Indenture did or will comply in all 
     material respects with the applicable requirements of the Trust 
     Indenture Act and the rules thereunder; and, on the Effective Date, the 
     Final Prospectus, if not filed pursuant to Rule 424(b), will not, and on 
     the date of any filing pursuant to Rule 424(b) and on the Closing Date, 
     the Final Prospectus (together with any supplement thereto) will not, 
     include any untrue statement of a material fact or omit to state a 
     material fact necessary in order to make the statements therein, in the 
     light of the circumstances under which they were made, not misleading; 
     PROVIDED, HOWEVER, that the Company makes no representations or 
     warranties as to (i) that part of the Registration Statement which shall 
     constitute the Statement of Eligibility and Qualification (Form T-1) 
     under the Trust Indenture Act of the Trustee or (ii) the information 
     contained in or omitted from the Registration Statement or the Final 
     Prospectus (or any supplement thereto) in reliance upon and in 
     conformity with information furnished in writing to the Company by or on 
     behalf of any Underwriter through the Representatives specifically for 
     inclusion in the Registration Statement or the Final Prospectus (or any 
     supplement thereto).

          (c)  The Company has been duly incorporated and is validly existing 
     as a corporation under the laws of the State of Wisconsin with power and 
     authority (corporate and other) to own or lease, as the case may be, and 
     to operate its properties and conduct its business as described in the 
     Final Prospectus; the Company has not filed Articles of Dissolution with 
     the Secretary of State of Wisconsin, and no grounds exist for the 
     Secretary of State of Wisconsin to dissolve such corporation 
     administratively pursuant to the provisions of the Wisconsin Business 
     Corporation Law; the Company is duly qualified to do business as a 
     foreign corporation and is in good standing under the laws of each 
     jurisdiction which requires such qualification; the Company is a "public 
     utility company," as such term is defined in the Public Utility Holding 
     Company Act of 1935, as amended (the "Public Utility Holding Company 
     Act").

                                       3
<PAGE>

          (d)  The Company has no subsidiaries which, either individually or 
     considered in the aggregate as a single subsidiary, constitute a 
     "significant subsidiary" as defined in Rule 1-02 of Regulation S-X.

          (e)  All of the Company's issued and outstanding shares of common 
     stock are owned, beneficially and of record, by WPS Resources 
     Corporation, a Wisconsin corporation ("WPSR"); the Company's authorized 
     preferred stock is as set forth in the Final Prospectus; except as set 
     forth in the Final Prospectus, no options, warrants or other rights to 
     purchase, agreements or other obligations to issue, or rights to convert 
     any obligations into or exchange any securities for, shares of capital 
     stock or ownership interests of the Company are outstanding.

          (f)  There is no franchise, contract or other document of a 
     character required to be described in the Registration Statement or 
     Final Prospectus, or to be filed as an exhibit thereto, which is not 
     described or filed as required.

          (g)  This Agreement has been duly authorized, executed and 
     delivered by the Company and constitutes a valid and binding obligation 
     of the Company enforceable in accordance with its terms.

          (h)  The Senior Indenture has been duly authorized by the Company; 
     on the Closing Date, the Senior Indenture will have been duly executed 
     by the Company and, assuming due authorization, execution and delivery 
     by the Senior Trustee, will be a  valid and binding instrument 
     enforceable against the Company in accordance with its terms, subject, 
     as to enforcement of remedies, to applicable bankruptcy, reorganization, 
     insolvency, moratorium, or other laws affecting creditors' rights 
     generally from time to time in effect and to general principles of 
     equity, including, without limitation, concepts of materiality, 
     reasonableness, good faith and fair dealing, regardless of whether 
     considered in a proceeding in equity or at law (the "Bankruptcy 
     Exceptions"); the Senior Indenture has been duly qualified under the 
     Trust Indenture Act; the Senior Indenture conforms in all material 
     respects to the description thereof contained in the Final Prospectus.

          (i)  The Senior Notes have been duly authorized by the Company; on 
     the Closing Date, the Senior Notes will have been duly executed by the 
     Company, and when authenticated in accordance with the provisions of the 
     Senior Indenture and delivered and paid for by the Underwriters pursuant 
     to this Agreement, will constitute valid and legally binding obligations 
     of the Company entitled to the benefits and security provided by the 
     Senior Indenture and enforceable against the Company in accordance with 
     their terms, subject, as to enforcement of remedies, to the Bankruptcy 
     Exceptions; the Senior Notes conform in all material respects to the 
     description thereof contained in the Final Prospectus.

          (j)  The Original Mortgage Indenture has been duly authorized, 
     executed and delivered by the Company; the Supplemental Indenture to the 
     Mortgage Indenture has been duly authorized by the Company and, on the 
     Closing Date, will have been duly executed and 

                                       4
<PAGE>

     delivered by the Company and, assuming due execution and delivery of the 
     Supplemental Indenture to the Mortgage Indenture by the Mortgage 
     Trustee, the Mortgage Indenture will constitute a valid and binding 
     instrument, enforceable against the Company in accordance with its 
     terms, except as the same may be limited by the laws of the States of 
     Wisconsin and Michigan affecting the remedies for the enforcement of the 
     security provided for therein (which laws do not make such remedies 
     inadequate for the realization of the benefits of such security) and by 
     the Bankruptcy Exceptions; the Mortgage Indenture conforms in all 
     material respects to the description thereof contained in the Final 
     Prospectus.

          (k)  The Collateral Bonds have been duly authorized by the Company 
     and, when duly executed and authenticated in accordance with the 
     provisions of the Mortgage Indenture and delivered to the Senior Trustee 
     in the manner provided therein, will have been duly authorized, 
     executed, authenticated and issued and will constitute valid and legally 
     binding obligations of the Company, secured by the lien of, and entitled 
     to the benefits provided by, the Mortgage Indenture, equally and ratably 
     with all other bonds of the Company duly issued and outstanding under 
     the Mortgage Indenture, and  will be enforceable against the Company in 
     accordance with their terms, except as the same may be limited by the 
     laws of the States of Wisconsin and Michigan affecting the remedies for 
     the enforcement of the security provided for therein (which laws do not 
     make such remedies inadequate for the realization of the benefits of 
     such security) and by the Bankruptcy Exceptions; the Collateral Bonds 
     conform in all material respects to the description thereof contained in 
     the Final Prospectus.

          (l)  Each of the Company and its subsidiaries owns or leases all 
     such properties as are necessary to the conduct of its operations as 
     presently conducted. The properties of the Company described under Item 
     2 of the Company's most recent Annual Report on Form 10-K are owned in 
     fee simple either individually or jointly, as indicated in such annual 
     report, or are held under valid leases, in each case subject only to the 
     lien of the Mortgage Indenture and minor imperfections of titles and 
     encumbrances, if any, which are not substantial in amount, do not 
     materially detract from the value or marketability of the properties 
     subject thereto, and do not materially impair the Company's operations.

          (m)  The Company is not and, after giving effect to the offering 
     and sale of the Senior Notes and the application of the proceeds thereof 
     as described in the Final Prospectus, will not be an "investment 
     company" as defined in the Investment Company Act of 1940, as amended.

          (n)  Except for WPSR, no person or corporation which is a "holding 
     company" or a "subsidiary of a holding company" within the meaning of 
     such terms as defined in the Public Holding Company Act, directly or 
     indirectly owns, controls or holds with power to vote 10% or more of the 
     outstanding voting securities of the Company; WPSR and the Company are 
     presently exempt from the provisions of the  Public Utility Holding 
     Company Act which would require them to register thereunder.

                                       5
<PAGE>

          (o)  The Public Service Commission of Wisconsin has duly authorized 
     the issuance and sale by the Company of the Senior Notes and the 
     issuance and pledge of the Collateral Bonds on the terms set forth in 
     the Final Prospectus and this  Agreement, and such authorization is in 
     force and effect and sufficient for the issuance and sale of the Senior 
     Notes to the Underwriters and the issuance and pledge of the Collateral 
     Bonds to the Senior Trustee.  No other consent, approval, authorization, 
     filing with or order of any court or other governmental agency or body 
     is required in connection with the transactions contemplated herein, 
     except such as have been obtained under the Act and the Trust Indenture 
     Act and such as may be required under the blue sky laws of any 
     jurisdiction in connection with the purchase and distribution of the 
     Senior Notes by the Underwriters in the manner contemplated herein and 
     in the Final Prospectus.

          (p)  The execution and delivery of the Senior Indenture or the 
     Supplemental Indenture to the Mortgage Indenture, the issue and sale of 
     the Senior Notes, the issue and pledge of the Collateral Bonds, the 
     consummation of any other of the transactions herein contemplated or the 
     fulfillment of the terms hereof will not conflict with, result in a 
     breach or violation or imposition of any lien, charge or encumbrance 
     upon any property or assets of the Company or any of its subsidiaries 
     pursuant to, (i) the charter or by-laws of the Company or any of its 
     subsidiaries, (ii) the terms of any indenture, contract, lease, 
     mortgage, deed of trust, note agreement, loan agreement or other 
     agreement, obligation, condition, covenant or instrument to which the 
     Company or any of its subsidiaries is a party or bound or to which its 
     or their property is subject (other than the lien of the  Mortgage 
     Indenture), or (iii) any statute, law, rule, regulation, judgment, order 
     or decree applicable to the Company or any of its subsidiaries of any 
     court, regulatory body, administrative agency, governmental body, 
     arbitrator or other authority having jurisdiction over the Company or 
     any of its subsidiaries or any of its or their properties.

          (q)  No holders of securities of the Company have rights to the 
     registration of such securities under the Registration Statement.

          (r)  The consolidated historical financial statements and schedules 
     of the Company and its consolidated subsidiary included in the Final 
     Prospectus and the Registration Statement present fairly in all material 
     respects the financial condition, results of operations and cash flows 
     of the Company and its subsidiary as of the dates and for the periods 
     indicated, comply as to form with the applicable accounting requirements 
     of the Act and have been prepared in conformity with generally accepted 
     accounting principles applied on a consistent basis throughout the 
     periods involved (except as otherwise noted therein).  The selected 
     financial data set forth under the caption "Summary Financial 
     Information" in the Final Prospectus and Registration Statement fairly 
     present, on the basis stated in the Final Prospectus and the 
     Registration Statement, the information included therein.

          (s)  No action, suit or proceeding by or before any court or 
     governmental agency, authority or body or any arbitrator involving the 
     Company or any of its subsidiaries or its or 

                                       6
<PAGE>

     their property is pending or, to the best knowledge of the Company, 
     threatened that (i) could reasonably be expected to have a material 
     adverse effect on the performance of this Agreement or the consummation 
     of any of the transactions contemplated hereby or (ii) could reasonably 
     be expected to have a material adverse effect on the condition 
     (financial or otherwise), prospects, earnings, business or properties of 
     the Company and its subsidiaries, taken as a whole, whether or not 
     arising from transactions in the ordinary course of business, except as 
     set forth in or contemplated in the Final Prospectus (exclusive of any 
     supplement thereto).

          (t)  Neither the Company nor any of its subsidiaries is  in 
     violation or default of (i) any provision of its charter or bylaws, (ii) 
     the terms of any indenture, contract, lease, mortgage, deed of trust, 
     note agreement, loan agreement or other agreement, obligation, 
     condition, covenant or instrument to which it is a party or bound or to 
     which its property is subject, except for such violations or defaults 
     which would not, individually or in the aggregate, have a material 
     adverse effect on the condition (financial or otherwise), prospects, 
     earnings, business or properties of the Company and its subsidiaries, 
     taken as a whole, whether or not arising from transactions in the 
     ordinary course of business, or (iii) any statute, law, rule, 
     regulation, judgment, order or decree of any court, regulatory body, 
     administrative agency, governmental body, arbitrator or other authority 
     having jurisdiction over the Company or such subsidiary or any of its 
     properties, as applicable.

          (u)  Arthur Andersen LLP, who have certified certain financial 
     statements of the Company and its consolidated subsidiary and delivered 
     their report with respect to the audited consolidated financial 
     statements and schedules included in the Final Prospectus, are 
     independent public accountants with respect to the Company within the 
     meaning of the Act and the applicable published rules and regulations 
     thereunder.

          (v)  The Company has filed all foreign, federal, state and local 
     tax returns that are required to be filed or has requested extensions 
     thereof (except in any case in which the failure so to file would not 
     have a material adverse effect on the condition (financial or 
     otherwise), prospects, earnings, business or properties of the Company 
     and its subsidiaries, taken as a whole, whether or not arising from 
     transactions in the ordinary course of business, except as set forth in 
     or contemplated in the Final Prospectus (exclusive of any supplement 
     thereto) and has paid all taxes required to be paid by it and any other 
     assessment, fine or penalty levied against it, to the extent that any of 
     the foregoing is due and payable, except for any such assessment, fine 
     or penalty that is currently being contested in good faith or as would 
     not have a material adverse effect on the condition (financial or 
     otherwise), prospects, earnings, business or properties of the Company 
     and its subsidiaries, taken as a whole, whether or not arising from 
     transactions in the ordinary course of business, except as set forth in 
     or contemplated in the Final Prospectus (exclusive of any supplement 
     thereto).

          (w)  No labor problem or dispute with the employees of the Company 
     exists or is threatened or imminent, and the Company is not aware of any 
     existing or imminent labor 

                                       7
<PAGE>

     disturbance by the employees of any of its principal suppliers, 
     contractors or customers, that could have a material adverse effect on 
     the condition (financial or otherwise), prospects, earnings, business or 
     properties of the Company and its subsidiaries, taken as a whole, 
     whether or not arising from transactions in the ordinary course of 
     business, except as set forth in or contemplated in the Final Prospectus 
     (exclusive of any supplement thereto).

          (x)  The Company and each of its subsidiaries are insured by 
     insurers of recognized financial responsibility against such losses and 
     risks and in such amounts as are prudent and customary in the businesses 
     in which they are engaged; all policies of insurance and fidelity or 
     surety bonds insuring the Company or any of its subsidiaries or their 
     respective businesses, assets, employees, officers and directors are in 
     full force and effect; the Company and its subsidiaries are in 
     compliance with the terms of such policies and instruments in all 
     material respects; and there are no claims by the Company or any of its 
     subsidiaries under any such policy or instrument as to which any 
     insurance company is denying liability or defending under a reservation 
     of rights clause, except for such claims which, if successfully denied, 
     would not have a material adverse effect on the condition (financial or 
     otherwise), prospects, earnings, business or properties of the Company 
     and its subsidiaries, taken as a whole, whether or not arising from 
     transactions in the ordinary course of business; neither the Company nor 
     any such subsidiary has been refused any insurance coverage sought or 
     applied for; and neither the Company nor any subsidiary has any reason 
     to believe that it will not be able to renew its existing insurance 
     coverage as and when such coverage expires or to obtain similar coverage 
     from similar insurers as may be necessary to continue its business at a 
     cost that would not have a material adverse effect on the condition 
     (financial or otherwise), prospects, earnings, business or properties of 
     the Company and its subsidiaries, taken as a whole, whether or not 
     arising from transactions in the ordinary course of business, except as 
     set forth in or contemplated in the Final Prospectus (exclusive of any 
     supplement thereto).

          (y)  The Company and its subsidiaries possess all licenses, 
     certificates, permits and other authorizations issued by the appropriate 
     federal, state or foreign regulatory authorities necessary to conduct 
     their respective  businesses, and neither the Company nor any subsidiary 
     has received any notice of proceedings relating to the revocation or 
     modification of any such certificate, authorization or permit which, 
     singly or in the aggregate, if the subject of an unfavorable decision, 
     ruling or finding, would have a material adverse effect on the condition 
     (financial or otherwise), prospects, earnings, business or properties of 
     the Company and its subsidiaries, taken as a whole, whether or not 
     arising from transactions in the ordinary course of business, except as 
     set forth in or contemplated in the Final Prospectus (exclusive of any 
     supplement thereto).

          (z)  The Company and each of its subsidiaries maintains a system of 
     internal accounting controls sufficient to provide reasonable assurance 
     that (i) transactions are executed in accordance with management's 
     general or specific authorizations; (ii) transactions are recorded as 
     necessary to permit preparation of financial statements in 

                                       8
<PAGE>

     conformity with generally accepted accounting principles and to maintain 
     asset accountability; (iii) access to assets is permitted only in 
     accordance with management's general or specific authorization; and (iv) 
     the recorded accountability for assets is compared with the existing 
     assets at reasonable intervals and appropriate action is taken with 
     respect to any differences.

          (aa) The Company has not taken, directly or indirectly, any action 
     designed to or which has constituted or which might reasonably be 
     expected to cause or result, under the Exchange Act or otherwise, in 
     stabilization or manipulation of the price of any security of the 
     Company to facilitate the sale or resale of the Senior Notes.

          (bb) The Company and its subsidiaries are (i) in compliance with 
     any and all applicable foreign, federal, state and local laws and 
     regulations relating to the protection of human health and safety, the 
     environment or hazardous or toxic substances or wastes, pollutants or 
     contaminants ("Environmental Laws"), (ii) have received and are in 
     compliance with all permits, licenses or other approvals required of 
     them under applicable Environmental Laws to conduct their respective  
     businesses, and (iii) have not received notice of any actual or 
     potential liability for the investigation or remediation of any disposal 
     or release of hazardous or toxic substances or wastes, pollutants or 
     contaminants, except where such non-compliance with Environmental Laws, 
     failure to receive required permits, licenses or other approvals, or 
     liability would not, individually or in the aggregate, have a material 
     adverse effect on the condition (financial or otherwise), prospects, 
     earnings, business or properties of the Company and its subsidiaries, 
     taken as a whole, whether or not arising from transactions in the 
     ordinary course of business, except as set forth in or contemplated in 
     the Final Prospectus (exclusive of any supplement thereto).  Except as 
     set forth in the Final Prospectus, the Company has not been named as a 
     "potentially responsible party" under the Comprehensive Environmental 
     Response, Compensation, and Liability Act of 1980, as amended, except in 
     such instances which would not, individually or in the aggregate,  have 
     a material adverse effect on the condition (financial or otherwise), 
     prospects, earnings, business or properties of the Company and its 
     subsidiaries, taken as a whole.

          (cc) In the ordinary course of its business, the Company 
     periodically reviews the effect of Environmental Laws on the  business, 
     operations and properties of the Company and its subsidiaries, in the 
     course of which it identifies and evaluates associated costs and 
     liabilities (including, without limitation, any capital or operating 
     expenditures required for clean-up, closure of properties or compliance 
     with Environmental Laws, or any permit, license or approval, any related 
     constraints on operating activities and any potential liabilities to 
     third parties).  On the basis of such review, the Company has reasonably 
     concluded that such associated costs and liabilities would not, singly 
     or in the aggregate, have a material adverse effect on the condition 
     (financial or otherwise), prospects, earnings, business or properties of 
     the Company and its subsidiaries, taken as a whole, whether or not 
     arising from transactions in the ordinary course of business, except as 
     set forth in or contemplated in the Final Prospectus (exclusive of any 
     supplement thereto).

                                       9
<PAGE>

          (dd) Each of the Company and its subsidiaries has fulfilled its 
     obligations,  if any, under the minimum funding standards of Section 302 
     of the United States Employee Retirement Income Security Act of 1974 
     ("ERISA") and the regulations and published interpretations thereunder 
     with respect to each "plan" (as defined in Section 3(3) of ERISA and 
     such regulations and published interpretations) in which employees of 
     the Company and its subsidiaries are eligible to participate, and each 
     such plan is in compliance in all material respects with the presently 
     applicable provisions of ERISA and such regulations and published 
     interpretations. The Company and its subsidiaries have not incurred any 
     unpaid liability to the Pension Benefit Guaranty Corporation (other than 
     for the payment of premiums in the ordinary course) or to any such plan 
     under Title IV of ERISA.

          (ee) The Company and its subsidiaries have implemented a 
     comprehensive, detailed program to analyze and address the risk that the 
     computer hardware and software used by it may be unable to recognize and 
     properly execute date-sensitive functions involving certain dates prior 
     to and any dates after December 31, 1999, and  reasonably believes that 
     such risk will be remedied on a timely basis without material expense, 
     except as set forth or contemplated in the Final Prospectus, and will 
     not have a material adverse effect upon the financial condition  and 
     results of operations of the Company and its subsidiaries, taken as a 
     whole.

     Any certificate signed by any officer of the Company and delivered to 
the Representatives or counsel for the Underwriters in connection with the 
offering of the Senior Notes shall be deemed a representation and warranty by 
the Company, as to matters covered thereby, to each Underwriter.

          2.   PURCHASE AND SALE.  Subject to the terms and conditions and in 
reliance upon the representations and warranties herein set forth, the 
Company agrees to sell to each Underwriter, and each Underwriter agrees, 
severally and not jointly, to purchase from the Company, at the purchase 
price set forth in Schedule I hereto the principal amount of the Senior Notes 
set forth opposite such Underwriter's name in Schedule II hereto.

          3.    DELIVERY AND PAYMENT.  Delivery of and payment for the Senior 
Notes shall be made on the date and at the time specified in Schedule I 
hereto or at such time on such later date not more than three Business Days 
after the foregoing date as the Representatives shall designate, which date 
and time may be postponed by agreement between the Representatives and the 
Company or as provided in Section 9 hereof (such date and time of delivery 
and payment for the Senior Notes being herein called the "Closing Date").  
Delivery of the Senior Notes shall be made to the Representatives for the 
respective accounts of the several Underwriters against payment by the 
several Underwriters through the Representatives of the purchase price 
thereof to or upon the order of the Company by wire transfer payable in 
same-day funds to an account specified by the Company.  Delivery of the 
Senior Notes shall be made through the facilities of The Depository Trust 
Company.

          4.   OFFERING BY UNDERWRITERS. It is understood that the several 
Underwriters propose to offer the Senior Notes for sale to the public as set 
forth in the Final Prospectus.

                                      10
<PAGE>

          5.   AGREEMENTS.  The Company agrees with the several Underwriters 
that:

          (a)  The Company will use its best efforts to cause the 
     Registration Statement, if not effective at the Execution Time, and any 
     amendment thereof, to become effective.  Prior to the termination of the 
     offering of the Senior Notes, the Company will not file any amendment of 
     the Registration Statement or supplement (including the Final Prospectus 
     or any Preliminary Final Prospectus) to the Basic Prospectus or any Rule 
     462(b) Registration Statement unless the Company has furnished you a 
     copy for your review prior to filing and will not file any such proposed 
     amendment or supplement to which you reasonably object.  Subject to the 
     foregoing sentence, if the Registration Statement has become or becomes 
     effective pursuant to Rule 430A, or filing of the Final Prospectus is 
     otherwise required under Rule 424(b), the Company will cause the Final 
     Prospectus, properly completed, and any supplement thereto to be filed 
     with the Commission pursuant to the applicable paragraph of Rule 424(b) 
     within the time period prescribed and will provide evidence satisfactory 
     to the Representatives of such timely filing.  The Company will promptly 
     advise the Representatives (1) when the Registration Statement, if not 
     effective at the Execution Time, shall have become effective, (2) when 
     the Final Prospectus, and any supplement thereto, shall have been filed 
     (if required) with the Commission pursuant to Rule 424(b) or when any 
     Rule 462(b) Registration Statement shall have been filed with the 
     Commission, (3) when, prior to termination of the offering of the Senior 
     Notes, any amendment to the Registration Statement shall have been filed 
     or become effective, (4) of any request by the Commission or its staff 
     for any amendment of the Registration Statement, or any Rule 462(b) 
     Registration Statement, or for any supplement to the Final Prospectus or 
     for any additional information, (5) of the issuance by the Commission of 
     any stop order suspending the effectiveness of the Registration 
     Statement or the institution or threatening of any proceeding for that 
     purpose and (6) of the receipt by the Company of any notification with 
     respect to the suspension of the qualification of the Senior Notes for 
     sale in any jurisdiction or the institution or threatening of any 
     proceeding for such purpose.  The Company will use its best efforts to 
     prevent the issuance of any such stop order or the suspension of any 
     such qualification and, if issued, to obtain as soon as possible the 
     withdrawal thereof.

          (b)  If, at any time when a prospectus relating to the Senior Notes 
     is required to be delivered under the Act, any event occurs as a result 
     of which the Final Prospectus as then supplemented would include any 
     untrue statement of a material fact or omit to state any material fact 
     necessary to make the statements therein in the light of the 
     circumstances under which they were made not misleading, or if it shall 
     be necessary to amend the Registration Statement or supplement the Final 
     Prospectus to comply with the Act or the Exchange Act or the respective 
     rules thereunder, the Company promptly will (1) notify the 
     Representatives of such event, (2) prepare and file with the Commission, 
     subject to the second sentence of paragraph (a) of this Section 5, an 
     amendment or supplement which will correct such statement or omission or 
     effect such compliance, and (3) supply any supplemented Final Prospectus 
     to you in such quantities as you may reasonably request.

                                      11
<PAGE>

          (c)  As soon as practicable, the Company will make generally 
     available to its security holders and to the Representatives an earnings 
     statement or statements of the Company and its subsidiaries which will 
     satisfy the provisions of Section 11(a) of the Act and Rule 158 under 
     the Act.

          (d)  The Company will furnish to the Representatives and counsel 
     for the Underwriters, without charge, copies of the Registration 
     Statement (including exhibits thereto) and to each other Underwriter a 
     copy of the Registration Statement (without exhibits thereto) and, so 
     long as delivery of a prospectus by an Underwriter or dealer may be 
     required by the Act, as many copies of each Preliminary Final Prospectus 
     and the Final Prospectus and any supplement thereto as the 
     Representatives may reasonably request. The Company will pay the 
     expenses of printing or other production of all documents relating to 
     the offering.

          (e)  The Company will arrange, if necessary, for the qualification of
     the Senior Notes for sale under the laws of such jurisdictions as the
     Representatives may designate and will maintain such qualifications in
     effect so long as required for the distribution of the Senior Notes;
     provided that in no event shall the Company be obligated to qualify to do
     business in any jurisdiction where it is not now so qualified or to take
     any action that would subject it to service of process in suits, other than
     those arising out of the offering or sale of the Senior Notes, in any
     jurisdiction where it is not now so subject.

          (f)  Until the Business Day set forth on Schedule I hereto, the
     Company will not, without the prior written consent of Salomon Smith
     Barney, offer, sell or contract to sell, or otherwise dispose of (or enter
     into any transaction which is designed to, or might reasonably be expected
     to, result in the disposition (whether by actual disposition or effective
     economic disposition due to cash settlement or otherwise) by the Company or
     any affiliate of the Company or any person in privity with the Company or
     any affiliate of the Company) directly or indirectly, or announce the
     offering of, any debt securities issued or guaranteed by the Company (other
     than the Senior Notes, commercial paper or other short-term debt).

          (g)  The Company will not take, directly or indirectly, any action
     designed to or which has constituted or which might reasonably be expected
     to cause or result, under the Exchange Act or otherwise, in stabilization
     or manipulation of the price of any security of the Company to facilitate
     the sale or resale of the Senior Notes.

          (h)  The Company will issue and deliver the Collateral Bonds to the
     Senior Trustee as security for the Senior Notes in the manner described in
     the Final Prospectus.

          6.   CONDITIONS TO THE OBLIGATIONS OF THE UNDERWRITERS.  The
obligations of the Underwriters to purchase the Senior Notes shall be subject to
the accuracy of the representations and warranties on the part of the Company
contained herein as of the Execution Time and the Closing Date, to the accuracy
of the statements of the Company made in any certificates pursuant to the

                                       12
<PAGE>


provisions hereof, to the performance by the Company of its obligations
hereunder and to the following additional conditions:

          (a)  If the Registration Statement has not become effective prior to
     the Execution Time, unless the Representatives agree in writing to a later
     time, the Registration Statement will become effective not later than
     (i) 6:00 PM New York City time, on the date of determination of the public
     offering price, if such determination occurred at or prior to 3:00 PM New
     York City time on such date, or (ii) 9:30 AM on the Business Day following
     the day on which the public offering price was determined, if such
     determination occurred after 3:00 PM New York City time on such date; if
     filing of the Final Prospectus, or any supplement thereto, is required
     pursuant to Rule 424(b), the Final Prospectus, and any such supplement,
     will be filed in the manner and within the time period required by
     Rule 424(b); and no stop order suspending the effectiveness of the
     Registration Statement shall have been issued and no proceedings for that
     purpose shall have been instituted or threatened.

          (b)  The Company shall have requested and caused Foley & Lardner,
     counsel for the Company, to have furnished to the Representatives their
     opinion, dated the Closing Date and addressed to the Representatives, to
     the effect that:

               (i)    The Company has been duly incorporated and is validly
          existing as a corporation under the laws of the State of Wisconsin,
          with full corporate power and authority to own or lease, as the case
          may be, and to operate its properties and conduct its business as
          described in the Final Prospectus, and is duly qualified to do
          business as a foreign corporation and is in good standing under the
          laws of Michigan; the Company is a "public utility company," as such
          term is defined under the Public Utility Holding Company Act.

               (ii)   All of the Company's issued and outstanding shares of
          common stock are owned of record by WPSR; the Company's authorized
          preferred stock is as set forth in the Final Prospectus; to the
          knowledge of such counsel, except as set forth in the Final
          Prospectus, no options, warrants or other rights to purchase,
          agreements or other obligations to issue, or rights to convert any
          obligations into or exchange any securities for, shares of capital
          stock of or ownership interests in the Company are outstanding.

               (iii)  To the knowledge of such counsel, there is no pending or
          threatened action, suit or proceeding by or before any court or
          governmental agency, authority or body or any arbitrator involving the
          Company or any of its subsidiaries or its or their property, of a
          character required to be disclosed in the Registration Statement which
          is not adequately disclosed in the Final Prospectus, and there is no
          franchise, contract or other document of a character required to be
          described in the Registration Statement or Final Prospectus, or to be
          filed as an exhibit thereto, which is not described or filed as
          required.

                                       13
<PAGE>

               (iv)   The Registration Statement has become effective under the
          Act; any required filing of the Basic Prospectus, any Preliminary
          Final Prospectus and the Final Prospectus, and any supplements
          thereto, pursuant to Rule 424(b) has been made in the manner and
          within the time period required by Rule 424(b); to the knowledge of
          such counsel, no stop order suspending the effectiveness of the
          Registration Statement has been issued, no proceedings for that
          purpose have been instituted or threatened, and the Registration
          Statement and the Final Prospectus (other than the financial
          statements and other financial information contained therein, as to
          which such counsel need express no opinion) comply as to form in all
          material respects with the applicable requirements of the Act, the
          Exchange Act and the Trust Indenture Act and the respective rules
          thereunder; and such counsel has no reason to believe that on the
          Effective Date or at the Execution Time the Registration Statement
          contained any untrue statement of a material fact or omitted to state
          any material fact required to be stated therein or necessary to make
          the statements therein not misleading or that the Final Prospectus as
          of its date and on the Closing Date included or includes any untrue
          statement of a material fact or omitted or omits to state a material
          fact necessary to make the statements therein, in the light of the
          circumstances under which they were made, not misleading (in each
          case, other than the financial statements and other financial
          information contained therein, as to which such counsel need express
          no opinion).

               (v)    This Agreement has been duly authorized, executed and
          delivered by the Company.

               (vi)   The Senior Indenture has been duly authorized, executed
          and delivered by the Company and constitutes a valid and binding
          instrument enforceable against the Company in accordance with its
          terms, subject, as to enforcement of remedies, to the Bankruptcy
          Exceptions; the Senior Indenture has been duly qualified under the
          Trust Indenture Act;  the Senior Indenture conforms in all material
          respects to the description thereof contained in the Final Prospectus.

               (vii)  The Senior Notes have been duly authorized by the Company,
          and when executed and authenticated in accordance with the provisions
          of the Senior Indenture and delivered and paid for by the Underwriters
          pursuant to this Agreement, will constitute valid and legally binding
          obligations of the Company entitled to the benefits and security
          provided by the Senior Indenture and enforceable against the Company
          in accordance with their terms, subject, as to enforcement of
          remedies, to the Bankruptcy Exceptions; the Senior Notes conform in
          all material respects to the description thereof contained in the
          Final Prospectus.

               (viii) The Mortgage Indenture has been duly authorized, executed
          and delivered by the Company and constitutes a valid and binding
          instrument, enforceable against the Company in accordance with its
          terms, except as the same 


                                       14
<PAGE>

          may be limited by the laws of the States of Wisconsin and Michigan 
          affecting the remedies for the enforcement of the security provided 
          for therein (which laws do not in such counsel's opinion make such 
          remedies inadequate for the realization of the benefits of such 
          security) and by the Bankruptcy Exceptions; the Mortgage Indenture 
          conforms in all material respects to the description thereof 
          contained in the Final Prospectus.

               (ix)   The Collateral Bonds have been duly authorized by the
          Company and, when executed and authenticated in accordance with the
          provisions of the Mortgage Indenture, and issued, pledged and
          delivered to the Senior Trustee pursuant to the Senior Indenture as
          security for the Senior Notes, will constitute valid and legally
          binding obligations of the Company, secured by the lien of, and
          entitled to the benefits provided by, the Mortgage Indenture, equally
          and ratably with all other bonds of the Company duly issued and
          outstanding under the Mortgage Indenture, and  will be enforceable
          against the Company in accordance with their terms, except as the same
          may be limited by the laws of the States of Wisconsin and Michigan
          affecting the remedies for the enforcement of the security provided
          for therein (which laws do not in such counsel's opinion make such
          remedies inadequate for the realization of the benefits of such
          security) and by the Bankruptcy Exceptions; the Collateral Bonds
          conform in all material respects to the description thereof contained
          in the Final Prospectus.

               (x)    The Company has good and marketable title to the real 
          and fixed properties described in the Mortgage Indenture (other 
          than properties disposed of and released thereunder and lands 
          described as held only under flowage rights) free and clear of all 
          liens, charges and encumbrances against the same prior to or on a 
          parity with the lien of the Mortgage Indenture, except for and 
          subject only to permissible encumbrances as defined in the Mortgage 
          Indenture and to such exceptions, defects and qualifications as in 
          such counsel's opinion do not materially affect the security for 
          the Collateral Bonds or the Company's title to or its right to use 
          such properties in the conduct of its business; the Mortgage 
          Indenture constitutes a valid and direct first lien upon all real 
          and fixed property and governmental licenses and permits owned by 
          the Company (including its interests as tenant-in-common), except 
          property specifically excepted from the Mortgage Indenture by the 
          terms thereof, subject to no liens or encumbrances prior to or on a 
          parity with the lien of the Mortgage Indenture, except permissible 
          encumbrances as defined in the Mortgage Indenture; and the 
          description in the Mortgage Indenture of said property is adequate 
          to constitute the Mortgage Indenture a lien thereon. No examination 
          of title covering rights-of-way for transmission and distribution 
          lines has been made inasmuch as the Company has been advised that 
          the expense incident to the obtaining of abstracts or certificates 
          of title and of examinations in respect thereto would be in excess 
          of the cost of reacquiring by condemnation or purchase, possession 
          and use of such parts of such rights-of-way 

                                       15
<PAGE>

          as might be held under defective titles, and accordingly, such  
          opinion does not  cover such rights-of-way.  Such counsel has 
          relied on certificates of officers of the Company to the effect 
          that certain parcels described in the  Mortgage Indenture are 
          rights-of-way and that certain parcels are not required as an 
          integral part of the Company's properties or are not indispensable 
          to its operations. All real property hereafter acquired by the 
          Company and located in counties in which the Mortgage Indenture 
          shall be of record will, upon acquisition, become subject to the 
          lien of the Mortgage Indenture, subject, however, to permitted 
          encumbrances and liens (as defined in the Mortgage Indenture), any 
          liens existing or placed thereon at acquisition and any liens which 
          might intervene prior to the filing or recording of the instrument 
          containing a sufficient legal description confirming of record that 
          such property is subject to the lien of the Mortgage Indenture, 
          except as the existence or validity of the lien of the Mortgage 
          Indenture may be affected by the application of Sections 547 and/or 
          552 of the U.S. Bankruptcy Code or by analogous provisions of 
          applicable state insolvency laws.

               (xi)   The Mortgage Indenture has been duly recorded or filed for
          record in each county in the States of Wisconsin and Michigan where
          any real properties described in such instrument are located and in
          all other places required by law in order to perfect the lien upon the
          property described in the Mortgage Indenture.

               (xii)  The Company has statutory authority, franchises, and
          consents free from burdensome restrictions and adequate for the
          conduct of the business in which it is engaged as described in the
          Final Prospectus, except to the extent that the absence of such
          statutory authority or the failure to obtain such franchises or
          consents would not, singly or in the aggregate, (A) affect the
          security for  the Collateral Bonds, or (B) have a material adverse
          effect on the condition (financial or otherwise), prospects, earnings,
          business or properties of the Company, whether or not arising from
          transactions in the ordinary course of business, except as set forth
          or contemplated in the Final Prospectus.

               (xiii) The issuance and delivery by the Company of the Collateral
          Bonds to the Trustee constitute a sale by the Company of the
          Collateral Bonds to the Trustee as of the Closing Date or, if not a
          sale, the grant by the Company to the Trustee of a perfected security
          interest in the Collateral Bonds for the benefit of the holders of the
          Senior Notes.

               (xiv)  The Company is not and, after giving effect to the
          offering and sale of the Senior Notes and the application of the
          proceeds thereof as described in the Final Prospectus, will not be an
          "investment company" as defined in the Investment Company Act of 1940,
          as amended.

                                       16
<PAGE>

               (xv)   The Public Service Commission of Wisconsin has duly
          authorized the issuance and sale by the Company of the Senior Notes
          and the issuance and pledge of the Collateral Bonds on the terms set
          forth in the Final Prospectus and this  Agreement, and such
          authorization is, to the best knowledge of such counsel, in force and
          effect and sufficient for the issuance and sale of the Senior Notes to
          the Underwriters and the issuance and pledge of the Collateral Bonds
          to the Senior Trustee.  No consent, approval, authorization, filing
          with or order of any court or other governmental agency or body is
          required in connection with the transactions contemplated herein,
          except such as have been obtained under the Act and the Trust
          Indenture Act and such as may be required under the blue sky laws of
          any jurisdiction in connection with the purchase and distribution of
          the Senior Notes by the Underwriters in the manner contemplated herein
          and in the Final Prospectus.

               (xvi)   The execution and delivery of the Senior Indenture or the
          Supplemental Indenture to the Mortgage Indenture, the issuance and
          sale of the Senior Notes, the issuance and pledge of the Collateral
          Bonds, the consummation of any other of the transactions herein
          contemplated or the fulfillment of the terms hereof will not conflict
          with, result in a breach or violation of or imposition of any lien,
          charge or encumbrance upon any property or assets of the Company
          pursuant to, (i) the charter or by-laws of the Company, (ii) the terms
          of any indenture, contract, lease, mortgage, deed of trust, note
          agreement, loan agreement or other agreement, obligation, condition,
          covenant or instrument (other than the lien of the Mortgage Indenture)
          known to such counsel to which the Company is a party or bound or to
          which its property is subject,  (iii)  any statute, law, rule, or
          regulation applicable to the Company, or (iv) any judgment, order or
          decree known to such counsel and applicable to the Company  of any
          court, regulatory body, administrative agency, governmental body,
          arbitrator or other authority having jurisdiction over the Company or
          any of its properties.

               (xvii) To the knowledge of such counsel, no holders of securities
          of the Company have rights to the registration of such securities
          under the Registration Statement.

     In rendering such opinion, such counsel  (A) may rely as to matters
     involving the application of laws of any jurisdiction other than the State
     of Wisconsin or the Federal laws of the United States, to the extent they
     deem proper and specified in such opinion, upon the opinion of other
     counsel of good standing whom they believe to be reliable and who are
     satisfactory to counsel for the Underwriters, (B) may assume, as to matters
     of New York law relating to this Agreement, that New York law does not
     differ from Wisconsin law in any material respect, and (C) may rely, as to
     matters of fact, to the extent they deem proper, on certificates of
     responsible officers of the Company and public officials.  References to
     the Final Prospectus in this paragraph (b) include any supplements thereto
     at the Closing Date.

                                       17
<PAGE>

          (c)  The Representatives shall have received from Schiff Hardin &
     Waite, counsel for the Underwriters, such opinion or opinions, dated the
     Closing Date and addressed to the Representatives, with respect to the
     issuance and sale of the Senior Notes, the issuance and pledge of the
     Collateral Bonds, the Senior Indenture, the Mortgage Indenture, the
     Registration Statement, the Final Prospectus (together with any supplement
     thereto) and other related matters as the Representatives may reasonably
     require, and the Company shall have furnished to such counsel such
     documents as they request for the purpose of enabling them to pass upon
     such matters.

          (d)  The Company shall have furnished to the Representatives a
     certificate of the Company, signed by the Chairman of the Board or the
     President and the principal financial or accounting officer of the Company,
     dated the Closing Date, to the effect that the signers of such certificate
     have carefully examined the Registration Statement, the Final Prospectus,
     any supplements to the Final Prospectus and this Agreement and that:

               (i)    the representations and warranties of the Company in this
          Agreement are true and correct in all material respects on and as of
          the Closing Date with the same effect as if made on the Closing Date
          and the Company has complied with all the agreements and satisfied all
          the conditions on its part to be performed or satisfied at or prior to
          the Closing Date;

               (ii)   no stop order suspending the effectiveness of the
          Registration Statement has been issued and no proceedings for that
          purpose have been instituted or, to the Company's knowledge,
          threatened; and

               (iii)  since the date of the most recent financial statements
          included or incorporated by reference in the Final Prospectus
          (exclusive of any supplement thereto), there has been no material
          adverse effect on the condition (financial or otherwise), prospects,
          earnings, business or properties of the Company, whether or not
          arising from transactions in the ordinary course of business, except
          as set forth in or contemplated in the Final Prospectus (exclusive of
          any supplement thereto).

          (e)  The Company shall have requested and caused Arthur Andersen LLP
     to have furnished to the Representatives, at the Execution Time and at the
     Closing Date, letters, (which may refer to letters previously delivered to
     one or more of the Representatives), dated respectively as of the Execution
     Time and as of the Closing Date, in form and substance satisfactory to the
     Representatives, confirming that they are independent accountants within
     the meaning of the Act and the Exchange Act and the respective applicable
     published rules and regulations thereunder and stating in effect, except as
     provided in Schedule I hereto, that:

               (i)    in their opinion the audited financial statements and
          financial statement schedules included or incorporated by reference in
          the Registration Statement and the Final Prospectus and reported on by
          them comply as to form in all 

                                       18
<PAGE>

          material respects with the applicable accounting requirements of the 
          Act and the Exchange Act and the related published rules and 
          regulations;

               (ii)   on the basis of a reading of the latest unaudited
          financial statements made available by the Company and its
          subsidiaries; carrying out certain specified procedures (but not an
          examination in accordance with generally accepted auditing standards)
          which would not necessarily reveal matters of significance with
          respect to the comments set forth in such letter; a reading of the
          minutes of the meetings of the stockholders and directors of the
          Company; and inquiries of certain officials of the Company who have
          responsibility for financial and accounting matters of the Company and
          its subsidiaries as to transactions and events subsequent to December
          31, 1997, nothing came to their attention which caused them to believe
          that:

                      (1)     any unaudited financial statements included or
               incorporated by reference in the Registration Statement and the
               Final Prospectus do not comply as to form in all material
               respects with applicable accounting requirements of the Act and
               with the published rules and regulations of the Commission with
               respect to financial statements included or incorporated by
               reference in quarterly reports on Form 10-Q under the Exchange
               Act; and said unaudited financial statements are not in
               conformity with generally accepted accounting principles applied
               on a basis substantially consistent with that of the audited
               financial statements included or incorporated by reference in the
               Registration Statement and the Final Prospectus;

                      (2)     with respect to the period subsequent to September
               30, 1998, there were any changes, at a specified date not more
               than five days prior to the date of the letter, in the
               consolidated long-term debt of the Company or capital stock of
               the Company or decreases in consolidated net assets or
               stockholders' equity of the Company as compared with the amounts
               shown on the September 30, 1998 consolidated balance sheet
               included or incorporated by reference in the Registration
               Statement and the Final Prospectus, or for the period from
               October 1, 1998 to such specified date there were any decreases,
               as compared with the corresponding period in the preceding year,
               in consolidated operating revenues or in income before
               extraordinary items or net income of the Company, except in all
               instances for changes or decreases set forth in such letter, in
               which case the letter shall be accompanied by an explanation by
               the Company as to the significance thereof unless said
               explanation is not deemed necessary by the Representatives; or

                      (3)     the information included or incorporated by
               reference in the Registration Statement and Final Prospectus in
               response to Regulation S-K, Item 301 (Selected Financial Data)
               and Item 503(d) (Ratio of Earnings to 

                                       19
<PAGE>

               Fixed Charges) is not in conformity with the applicable 
               disclosure requirements of Regulation S-K; and

               (iii)  they have performed certain other specified procedures as
          a result of which they determined that certain information of an
          accounting, financial or statistical nature (which is limited to
          accounting, financial or statistical information derived from the
          general accounting records of the Company and its subsidiaries) set
          forth in the Registration Statement and the Final Prospectus and in
          Exhibit 12 to the Registration Statement, including the information
          set forth under the captions "Summary Financial Information" and
          "Ratios of Earnings to Fixed Charges " in the Final Prospectus, the
          information included or incorporated by reference in Items 1, 2, 6,
          and 7 of the Company's Annual Report on Form 10-K, incorporated by
          reference in the Registration Statement and the Final Prospectus, and
          the information included in the "Management's Discussion and Analysis
          of Financial Condition and Results of Operations" included or
          incorporated by reference in the Company's Quarterly Reports on
          Form 10-Q, incorporated by reference in the Registration Statement and
          the Final Prospectus, agrees with the accounting records of the
          Company and its subsidiaries, excluding any questions of legal
          interpretation.

     References to the Final Prospectus in this paragraph (e) include any
     supplement thereto at the date of the letter.

          (f)  Subsequent to the Execution Time or, if earlier, the dates as of
     which information is given in the Registration Statement (exclusive of any
     amendment thereof) and the Final Prospectus (exclusive of any supplement
     thereto), there shall not have been (i) any change or decrease specified in
     the letter or letters referred to in paragraph (e) of this Section 6 or
     (ii) any change, or any development involving a prospective change, in or
     affecting the condition (financial or otherwise), earnings, business or
     properties of the Company and its subsidiaries, taken as a whole, whether
     or not arising from transactions in the ordinary course of business, except
     as set forth in or contemplated in the Final Prospectus (exclusive of any
     supplement thereto) the effect of which, in any case referred to in
     clause (i) or (ii) above, is so material and adverse as to make it
     impractical or inadvisable to proceed with the offering or delivery of the
     Senior Notes as contemplated by the Registration Statement (exclusive of
     any amendment thereof) and the Final Prospectus (exclusive of any
     supplement thereto).

          (g)  Subsequent to the Execution Time, there shall not have been any
     decrease in the rating of any of the Company's debt securities (including
     the Senior Notes) by any "nationally recognized statistical rating
     organization" (as defined for purposes of Rule 436(g) under the Act) or any
     notice given of any intended or potential decrease in any such rating or of
     a possible change in any such rating that does not indicate the direction
     of the possible change.

                                       20
<PAGE>

          (h)  Prior to the Closing Date, the Company shall have furnished to
     the Representatives such further information, certificates and documents as
     the Representatives may reasonably request.

          If any of the conditions specified in this Section 6 shall not have 
been fulfilled in all material respects when and as provided in this 
Agreement, or if any of the opinions and certificates mentioned above or 
elsewhere in this Agreement shall not be in all material respects reasonably 
satisfactory in form and substance to the Representatives and counsel for the 
Underwriters, this Agreement and all obligations of the Underwriters 
hereunder may be canceled at, or at any time prior to, the Closing Date by 
the Representatives.  Notice of such cancellation shall be given to the 
Company in writing or by telephone or facsimile confirmed in writing.

          The documents required to be delivered by this Section 6 shall be 
delivered at the office of Foley & Lardner, counsel for the Company, at 777 
East Wisconsin Avenue, Milwaukee, Wisconsin 53202, on the Closing Date, or at 
such other place as may be agreed upon by the Company and the Underwriters.

          7.   REIMBURSEMENT OF UNDERWRITERS' EXPENSES.  If the sale of the 
Senior Notes provided for herein is not consummated because any condition to 
the obligations of the Underwriters set forth in Section 6 hereof is not 
satisfied, because of any termination pursuant to Section 10 hereof or 
because of any refusal, inability or failure on the part of the Company to 
perform any agreement herein or comply with any provision hereof other than 
by reason of a default by any of the Underwriters, the Company will reimburse 
the Underwriters severally through Salomon Smith Barney on demand for all 
out-of-pocket expenses (including reasonable fees and disbursements of 
counsel) that shall have been incurred by them in connection with the 
proposed purchase and sale of the Senior Notes.

          8.   INDEMNIFICATION AND CONTRIBUTION. (a)  The Company agrees to 
indemnify and hold harmless each Underwriter, the directors, officers, 
employees and agents of each Underwriter and each person who controls any 
Underwriter within the meaning of either the Act or the Exchange Act against 
any and all losses, claims, damages or liabilities, joint or several, to 
which they or any of them may become subject under the Act, the Exchange Act 
or other Federal or state statutory law or regulation, at common law or 
otherwise, insofar as such losses, claims, damages or liabilities (or actions 
in respect thereof) arise out of or are based upon any untrue statement or 
alleged untrue statement of a material fact contained in the registration 
statement for the registration of the Senior Notes as originally filed or in 
any amendment thereof, or in the Basic Prospectus, any Preliminary Final 
Prospectus or the Final Prospectus, or in any amendment thereof or supplement 
thereto, or arise out of or are based upon the omission or alleged omission 
to state therein a material fact required to be stated therein or necessary 
to make the statements therein not misleading, and agrees to reimburse each 
such indemnified party, as incurred, for any legal or other expenses 
reasonably incurred by them in connection with investigating or defending any 
such loss, claim, damage, liability or action; PROVIDED, HOWEVER, that the 
Company will not be liable in any such case to the extent that any such loss, 
claim, damage or liability arises out of or is based upon any such untrue 

                                       21
<PAGE>

statement or alleged untrue statement or omission or alleged omission made 
therein in reliance upon and in conformity with written information furnished 
to the Company by or on behalf of any Underwriter through the Representatives 
specifically for inclusion therein. This indemnity agreement will be in 
addition to any liability which the Company may otherwise have.

          (b)  Each Underwriter severally and not jointly agrees to indemnify 
and hold harmless the Company, each of its directors, each of its officers 
who signs the Registration Statement, and each person who controls the 
Company within the meaning of either the Act or the Exchange Act, to the same 
extent as the foregoing indemnity from the Company to each Underwriter, but 
only with reference to written information relating to such Underwriter 
furnished to the Company by or on behalf of such Underwriter through the 
Representatives specifically for inclusion in the documents referred to in 
the foregoing indemnity.  This indemnity agreement will be in addition to any 
liability which any Underwriter may otherwise have.

          (c)  Promptly after receipt by an indemnified party under this 
Section 8 of notice of the commencement of any action, such indemnified party 
will, if a claim in respect thereof is to be made against the indemnifying 
party under this Section 8, notify the indemnifying party in writing of the 
commencement thereof; but the failure so to notify the indemnifying party (i) 
will not relieve it from liability under paragraph (a) or (b) above unless 
and to the extent it did not otherwise learn of such action and such failure 
results in the forfeiture by the indemnifying party of substantial rights and 
defenses and (ii) will not, in any event, relieve the indemnifying party from 
any obligations to any indemnified party other than the indemnification 
obligation provided in paragraph (a) or (b) above.  The indemnifying party 
shall be entitled to appoint counsel of the indemnifying party's choice at 
the indemnifying party's expense to represent the indemnified party in any 
action for which indemnification is sought (in which case the indemnifying 
party shall not thereafter be responsible for the fees and expenses of any 
separate counsel retained by the indemnified party or parties except as set 
forth below); PROVIDED, HOWEVER, that such counsel shall be satisfactory to 
the indemnified party.  Notwithstanding the indemnifying party's election to 
appoint counsel to represent the indemnified party in an action, the 
indemnified party shall have the right to employ separate counsel (including 
local counsel), and the indemnifying party shall bear the reasonable fees, 
costs and expenses of such separate counsel if (i) the use of counsel chosen 
by the indemnifying party to represent the indemnified party would present 
such counsel with a conflict of interest, (ii) the actual or potential 
defendants in, or targets of, any such action include both the indemnified 
party and the indemnifying party and the indemnified party shall have 
reasonably concluded that there may be legal defenses available to it and/or 
other indemnified parties which are different from or additional to those 
available to the indemnifying party, (iii) the indemnifying party shall not 
have employed counsel satisfactory to the indemnified party to represent the 
indemnified party within a reasonable time after notice of the institution of 
such action, or (iv) the indemnifying party shall authorize the indemnified 
party to employ separate counsel at the expense of the indemnifying party.  
An indemnifying party will not, without the prior written consent of the 
indemnified parties, settle or compromise or consent to the entry of any 
judgment with respect to any pending or threatened claim, action, suit or 
proceeding in respect of which indemnification or contribution may be sought 
hereunder (whether or not the indemnified parties are actual or potential 

                                       22
<PAGE>

parties to such claim or action) unless such settlement, compromise or 
consent includes an unconditional release of each indemnified party from all 
liability arising out of such claim, action, suit or proceeding.

          (d)  In the event that the indemnity provided in paragraph (a) or 
(b) of this Section 8 is unavailable to or insufficient to hold harmless an 
indemnified party for any reason, the Company and the Underwriters severally 
agree to contribute to the aggregate losses, claims, damages and liabilities 
(including legal or other expenses reasonably incurred in connection with 
investigating or defending same) (collectively "Losses") to which the Company 
and one or more of the Underwriters may be subject in such proportion as is 
appropriate to reflect the relative benefits received by the Company on the 
one hand and by the Underwriters on the other from the offering of the Senior 
Notes; PROVIDED, HOWEVER, that in no case shall any Underwriter (except as 
may be provided in any agreement among underwriters relating to the offering 
of the Senior Notes) be responsible for any amount in excess of the 
underwriting discount or commission applicable to the Senior Notes purchased 
by such Underwriter hereunder.  If the allocation provided by the immediately 
preceding sentence is unavailable for any reason, the Company and the 
Underwriters severally shall contribute in such proportion as is appropriate 
to reflect not only such relative benefits but also the relative fault of the 
Company on the one hand and of the Underwriters on the other in connection 
with the statements or omissions which resulted in such Losses as well as any 
other relevant equitable considerations.  Benefits received by the Company 
shall be deemed to be equal to the total net proceeds from the offering 
(before deducting expenses) received by it, and benefits received by the 
Underwriters shall be deemed to be equal to the total underwriting discounts 
and commissions, in each case as set forth on the cover page of the Final 
Prospectus.  Relative fault shall be determined by reference to, among other 
things, whether any untrue or any alleged untrue statement of a material fact 
or the omission or alleged omission to state a material fact relates to 
information provided by the Company on the one hand or the Underwriters on 
the other, the intent of the parties and their relative knowledge, access to 
information and opportunity to correct or prevent such untrue statement or 
omission.  The Company and the Underwriters agree that it would not be just 
and equitable if contribution were determined by pro rata allocation or any 
other method of allocation which does not take account of the equitable 
considerations referred to above.  Notwithstanding the provisions of this 
paragraph (d), no person guilty of fraudulent misrepresentation (within the 
meaning of Section 11(f) of the Act) shall be entitled to contribution from 
any person who was not guilty of such fraudulent misrepresentation.  For 
purposes of this Section 8, each person who controls an Underwriter within 
the meaning of either the Act or the Exchange Act and each director, officer, 
employee and agent of an Underwriter shall have the same rights to 
contribution as such Underwriter, and each person who controls the Company 
within the meaning of either the Act or the Exchange Act, each officer of the 
Company who shall have signed the Registration Statement and each director of 
the Company shall have the same rights to contribution as the Company, 
subject in each case to the applicable terms and conditions of this paragraph 
(d).

          9.   DEFAULT BY AN UNDERWRITER.  If any one or more Underwriters 
shall fail to purchase and pay for any of the Senior Notes agreed to be 
purchased by such Underwriter or 

                                       23
<PAGE>

Underwriters hereunder and such failure to purchase shall constitute a 
default in the performance of its or their obligations under this Agreement, 
the remaining Underwriters shall be obligated severally to take up and pay 
for (in the respective proportions which the principal amount of Senior Notes 
set forth opposite their names in Schedule II hereto bears to the aggregate 
principal amount of Senior Notes set forth opposite the names of all the 
remaining Underwriters) the Senior Notes which the defaulting Underwriter or 
Underwriters agreed but failed to purchase; PROVIDED, HOWEVER, that in the 
event that the aggregate principal amount of Senior Notes which the 
defaulting Underwriter or Underwriters agreed but failed to purchase shall 
exceed 10% of the aggregate principal amount of Senior Notes set forth in 
Schedule II hereto, the remaining Underwriters shall have the right to 
purchase all, but shall not be under any obligation to purchase any, of the 
Senior Notes, and if such nondefaulting Underwriters do not purchase all the 
Senior Notes, this Agreement will terminate without liability to any 
nondefaulting Underwriter or the Company.  In the event of a default by any 
Underwriter as set forth in this Section 9, the Closing Date shall be 
postponed for such period, not exceeding five Business Days, as the 
Representatives shall determine in order that the required changes in the 
Registration Statement and the Final Prospectus or in any other documents or 
arrangements may be effected.  Nothing contained in this Agreement shall 
relieve any defaulting Underwriter of its liability, if any, to the Company 
and any nondefaulting Underwriter for damages occasioned by its default 
hereunder.

          10.  TERMINATION.  This Agreement shall be subject to termination 
in the absolute discretion of the Representatives, by notice given to the 
Company prior to delivery of and payment for the Senior Notes, if at any time 
prior to such time (i) trading in WPSR's common stock shall have been 
suspended by the Commission or the New York Stock Exchange or trading in 
securities generally on the New York Stock Exchange shall have been suspended 
or limited or minimum prices shall have been established on such Exchange, 
(ii) a banking moratorium shall have been declared either by Federal,  New 
York State or Wisconsin authorities or (iii) there shall have occurred any 
outbreak or escalation of hostilities, declaration by the United States of a 
national emergency or war, or other calamity or crisis the effect of which on 
financial markets is such as to make it, in the sole judgment of the 
Representatives, impractical or inadvisable to proceed with the offering or 
delivery of the Senior Notes as contemplated by the Final Prospectus 
(exclusive of any supplement thereto).

          11.  REPRESENTATIONS AND INDEMNITIES TO SURVIVE. The respective 
agreements, representations, warranties, indemnities and other statements of 
the Company or its officers and of the Underwriters set forth in or made 
pursuant to this Agreement will remain in full force and effect, regardless 
of any investigation made by or on behalf of any Underwriter or the Company 
or any of the officers, directors or controlling persons referred to in 
Section 8 hereof, and will survive delivery of and payment for the Senior 
Notes.  The provisions of Sections 7 and 8 hereof shall survive the 
termination or cancellation of this Agreement.

          12.  NOTICES.  All communications hereunder will be in writing and 
effective only on receipt, and, if sent to the Representatives, will be 
mailed, delivered or telefaxed to the Salomon Smith Barney General Counsel 
(fax no.: (212) 816-7912) and confirmed to the General Counsel, Salomon Smith 
Barney, at 388 Greenwich Street, New York, New York, 10013,  Attention:  
General 

                                       24
<PAGE>

Counsel; or, if sent to the Company, will be mailed, delivered or telefaxed 
to Ralph G. Baeten, Wisconsin Public Service Corporation (fax no: (920) 
433-1693) and confirmed to Wisconsin Public Service Corporation, 700 North 
Adams Street, P.O. Box 19001, Green Bay, Wisconsin, 53407, Attention: 
Treasurer.

          13.  SUCCESSORS.  This Agreement will inure to the benefit of and 
be binding upon the parties hereto and their respective successors and the 
officers and directors and controlling persons referred to in Section 8 
hereof, and no other person will have any right or obligation hereunder.

          14.  APPLICABLE LAW.  This Agreement will be governed by and 
construed in accordance with the laws of the State of New York applicable to 
contracts made and to be performed within the State of New York.

          15.  COUNTERPARTS.  This Agreement may be signed in one or more 
counterparts, each of which shall constitute an original and all of which 
together shall constitute one and the same agreement.

          16.  HEADINGS.  The section headings used herein are for 
convenience only and shall not affect the construction hereof.

          17.  DEFINITIONS.  The terms which follow, when used in this 
Agreement, shall have the meanings indicated.

          "Act" shall mean the Securities Act of 1933, as amended and the rules
     and regulations of the Commission promulgated thereunder.

          "Basic Prospectus" shall mean the prospectus referred to in paragraph
     1(a) above contained in the Registration Statement at the Effective Date
     including any Preliminary Final Prospectus.

          "Business Day" shall mean any day other than a Saturday, a Sunday or a
     legal holiday or a day on which banking institutions or trust companies are
     authorized or obligated by law to close in New York City or Milwaukee,
     Wisconsin.

          "Commission" shall mean the Securities and Exchange Commission.

          "Effective Date" shall mean each date and time that the Registration
     Statement, any post-effective amendment or amendments thereto and any
     Rule 462(b) Registration Statement became or become effective.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
     amended, and the rules and regulations of the Commission promulgated
     thereunder.
                                       25
<PAGE>


          "Execution Time" shall mean the date and time that this Agreement is
     executed and delivered by the parties hereto.

          "Final Prospectus" shall mean the prospectus supplement relating to
     the Senior Notes that was first filed pursuant to Rule 424(b) after the
     Execution Time, together with the Basic Prospectus.

          "Preliminary Final Prospectus" shall mean any preliminary prospectus
     supplement to the Basic Prospectus which describes the Senior Notes and the
     offering thereof and is used prior to filing of the Final Prospectus,
     together with the Basic Prospectus.

          "Registration Statement" shall mean the registration statement
     referred to in paragraph 1(a) above, including exhibits and financial
     statements, as amended at the Execution Time (or, if not effective at the
     Execution Time, in the form in which it shall become effective) and, in the
     event any post-effective amendment thereto or any Rule 462(b) Registration
     Statement becomes effective prior to the Closing Date, shall also mean such
     registration statement as so amended or such Rule 462(b) Registration
     Statement, as the case may be.  Such term shall include any Rule 430A
     Information deemed to be included therein at the Effective Date as provided
     by Rule 430A.

          "Rule 415", "Rule 424", "Rule 430A" and "Rule 462" refer to such rules
     under the Act.

          "Rule 430A Information" shall mean information with respect to the
     Senior Notes and the offering thereof permitted to be omitted from the
     Registration Statement when it becomes effective pursuant to Rule 430A.

          "Rule 462(b) Registration Statement" shall mean a registration
     statement and any amendments thereto filed pursuant to Rule 462(b) relating
     to the offering covered by the registration statement referred to in
     Section 1(a) hereof.

          "Trust Indenture Act" shall mean the Trust Indenture Act of 1939, as
     amended and the rules and regulations of the Commission promulgated
     thereunder.

                                       26
<PAGE>


          If the foregoing is in accordance with your understanding of our 
agreement, please sign and return to us the  enclosed duplicate hereof, 
whereupon this letter and your acceptance shall represent a binding agreement 
among the Company and the several Underwriters.

                              Very truly yours,

                              Wisconsin Public Service Corporation


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

The foregoing Agreement is
hereby confirmed and accepted
as of the date specified in
Schedule I hereto.

Salomon Smith Barney Inc.
A.G. Edwards & Sons, Inc.
Legg Mason Wood Walker, Incorporated

By:  Salomon Smith Barney Inc.



By: /s/ Robert Holloman
   ----------------------
Name:     Robert Holloman
Title:    Managing Director

For themselves and the other
several Underwriters, if any,
named in Schedule II to
the foregoing Agreement.

                                       27
<PAGE>

                                     SCHEDULE I

Underwriting Agreement             dated December 14, 1998

Registration Statement             No. 333-67979

Representative(s):                 Salomon Smith Barney Inc.
                                   A.G. Edwards & Sons, Inc.
                                   Legg Mason Wood Walker, Incorporated

Title, Purchase Price and Description of Senior Notes:

     Title:                        6.08% Senior Notes due December 1, 2028

     Principal amount:             $50,000,000

     Purchase price (include
     accrued interest or
     amortization, if any):        $50,168,888.89

     Sinking fund provisions:      None

     Redemption provisions:        The Senior Notes will be redeemable at the
                                   option of the Company in whole at any time or
                                   in part from time to time, at a price equal
                                   to the greater of (i) 100% of their principal
                                   amount or (ii) the sum of the present values
                                   of the remaining scheduled payments of
                                   principal and interest thereon 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 in the Prospectus Supplement and
                                   Supplemental Senior Indenture for the Senior
                                   Notes plus 20 basis points, plus in each case
                                   accrued interest to the date of redemption.

     Other provisions:             None other than those substantially in the
                                   form set forth in the forms of Indenture
                                   relating to the Senior Debt Securities and
                                   Supplemental Indenture relating to the Senior
                                   Debt Securities filed as Exhibits 4A and 4C
                                   to the Company's Registration Statement on
                                   Form S-3 (Reg.  No.  333-67979)

Closing Date, Time and Location:   December 21, 1998  at 10:00 a.m. at the
                                   offices of Foley & Lardner, Milwaukee,
                                   Wisconsin

Type of Offering:                  Non-delayed

                                       
<PAGE>

Date referred to in Section 5(f) after which the Company may offer or sell 
debt securities issued or guaranteed by the Company without the consent of 
the Representatives:  December 21, 1998

Modification of items to be covered by the letter from Arthur Andersen LLP 
delivered pursuant to Section 6(e) at the Execution Time:   NONE

                                       2
<PAGE>

                                    SCHEDULE II

<TABLE>
<CAPTION>
                                                                     Principal Amount
                                                                   of Senior Notes to
Underwriters                                                          be Purchased
- ------------                                                       -------------------
<S>                                                                <C>
Salomon Smith Barney Inc.                                             $ 32,500,000
     A.G. Edwards & Sons, Inc.                                          12,500,000
     Legg Mason Wood Walker, Incorporated                                5,000,000
                                                                      ------------
                         Total:                                       $ 50,000,000
                                                                      ------------
                                                                      ------------
</TABLE>


<PAGE>

                                                                             4A


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

                        WISCONSIN PUBLIC SERVICE CORPORATION

                                                         AS ISSUER

                                         TO

                 FIRSTAR BANK MILWAUKEE, N.A., NATIONAL ASSOCIATION

                                                         AS TRUSTEE



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

                                     INDENTURE


                               SENIOR DEBT SECURITIES

                            DATED AS OF DECEMBER 1, 1998

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

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

<PAGE>
                                       
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                  PAGE
<S>                                                                               <C>
RECITALS OF THE COMPANY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
ARTICLE I        DEFINITIONS AND OTHER PROVISIONS OF
                 GENERAL APPLICATION. . . . . . . . . . . . . . . . . . . . . . . . 2

     SECTION 1.01.       Definitions. . . . . . . . . . . . . . . . . . . . . . . . 2
          (a)    "ACT," . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
          (b)    "AFFILIATE". . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
          (c)    "AUTHENTICATING AGENT" . . . . . . . . . . . . . . . . . . . . . . 2
          (d)    "BANKRUPTCY LAW" . . . . . . . . . . . . . . . . . . . . . . . . . 2
          (e)    "BOARD OF DIRECTORS" . . . . . . . . . . . . . . . . . . . . . . . 3
          (f)    "BOARD RESOLUTION" . . . . . . . . . . . . . . . . . . . . . . . . 3
          (g)    "BONDHOLDER" . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
          (h)    "BUSINESS DAY,". . . . . . . . . . . . . . . . . . . . . . . . . . 3 
          (i)    "CAPITAL LEASE". . . . . . . . . . . . . . . . . . . . . . . . . . 3
          (j)    "CAPITALIZATION" . . . . . . . . . . . . . . . . . . . . . . . . . 3
          (k)    "COLLATERAL BONDS,". . . . . . . . . . . . . . . . . . . . . . . . 3
          (l)    "COMMISSION" . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
          (m)    "COMPANY". . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
          (n)    "COMPANY REQUEST" or "COMPANY ORDER" . . . . . . . . . . . . . . . 4
          (o)    "CORPORATE TRUST OFFICE" . . . . . . . . . . . . . . . . . . . . . 4
          (p)    "COVENANT DEFEASANCE". . . . . . . . . . . . . . . . . . . . . . . 4
          (q)    "CUSTODIAN". . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
          (r)    "DEBT" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
          (s)    "DEFAULT". . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
          (t)    "DEFAULTED INTEREST" . . . . . . . . . . . . . . . . . . . . . . . 4
          (u)    "DEFEASANCE" . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
          (v)    "DEPOSITARY" . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
          (w)    "DOLLARS" and "$". . . . . . . . . . . . . . . . . . . . . . . . . 4
          (x)    "EVENT OF DEFAULT" . . . . . . . . . . . . . . . . . . . . . . . . 4
          (y)    "EXCHANGE ACT" . . . . . . . . . . . . . . . . . . . . . . . . . . 5
          (z)    "EXPERT" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
          (aa)   "FIRST MORTGAGE BONDS" . . . . . . . . . . . . . . . . . . . . . . 5
          (bb)   "FIRST MORTGAGE INDENTURE" . . . . . . . . . . . . . . . . . . . . 5
          (cc)   "GAAP" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
          (dd)   "GLOBAL SECURITY". . . . . . . . . . . . . . . . . . . . . . . . . 5
          (ee)   "HOLDER" or "SECURITY HOLDER". . . . . . . . . . . . . . . . . . . 5
          (ff)   "HYBRID PREFERRED SECURITIES". . . . . . . . . . . . . . . . . . . 5

                                       -i-
<PAGE>

<CAPTION>
                                                                                  PAGE
<S>                                                                               <C>
          (gg)   "HYBRID PREFERRED SECURITIES SUBSIDIARY" . . . . . . . . . . . . . 6
          (hh)   "INDENTURE". . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
          (ii)   "INITIAL SECURITIES" . . . . . . . . . . . . . . . . . . . . . . . 6
          (jj)   "INTEREST,". . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
          (kk)   "INTEREST PAYMENT DATE," . . . . . . . . . . . . . . . . . . . . . 6
          (ll)   "JUNIOR SUBORDINATED INDEBTEDNESS" . . . . . . . . . . . . . . . . 6
          (mm)   "LIEN,". . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
          (nn)   "MATURITY,". . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
          (oo)   "MORTGAGE,". . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
          (pp)   "MORTGAGE TRUSTEE,". . . . . . . . . . . . . . . . . . . . . . . . 6
          (qq)   "NET TANGIBLE ASSETS". . . . . . . . . . . . . . . . . . . . . . . 6
          (rr)   "OFFICER". . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
          (ss)   "OFFICER'S CERTIFICATE". . . . . . . . . . . . . . . . . . . . . . 7
          (tt)   "OPERATING PROPERTY" . . . . . . . . . . . . . . . . . . . . . . . 7
          (uu)   "OPINION OF COUNSEL" . . . . . . . . . . . . . . . . . . . . . . . 7
          (vv)   "ORIGINAL ISSUE DISCOUNT SECURITY" . . . . . . . . . . . . . . . . 7
          (ww)   "OUTSTANDING," . . . . . . . . . . . . . . . . . . . . . . . . . . 7
          (xx)   "PAYING AGENT" . . . . . . . . . . . . . . . . . . . . . . . . . . 8
          (yy)   "PERSON" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
          (zz)   "PLACE OF PAYMENT,". . . . . . . . . . . . . . . . . . . . . . . . 8
          (aaa)  "REDEMPTION DATE," . . . . . . . . . . . . . . . . . . . . . . . . 8
          (bbb)  "REDEMPTION PRICE,". . . . . . . . . . . . . . . . . . . . . . . . 8
          (ccc)  "REGULAR RECORD DATE". . . . . . . . . . . . . . . . . . . . . . . 8
          (ddd)  "RELATED SERIES OF COLLATERAL BONDS" . . . . . . . . . . . . . . . 9
          (eee)  "RELATED SERIES OF SECURITIES" . . . . . . . . . . . . . . . . . . 9
          (fff)  "RELATED SERIES OF SUBSTITUTED COLLATERAL BONDS,". . . . . . . . . 9
          (ggg)  "RELEASE DATE,". . . . . . . . . . . . . . . . . . . . . . . . . . 9
          (hhh)  "RESPONSIBLE OFFICER," . . . . . . . . . . . . . . . . . . . . . . 9
          (iii)  "SALE AND LEASE-BACK TRANSACTION". . . . . . . . . . . . . . . . . 9
          (jjj)  "SECURITIES" . . . . . . . . . . . . . . . . . . . . . . . . . . .10
          (kkk)  "SECURITY REGISTER" and "SECURITY REGISTRAR". . . . . . . . . . . 10
          (lll)  "SPECIAL RECORD DATE" . . . . . . . . . . . . . . . . . . . . . . 10
          (mmm)  "STATED MATURITY,". . . . . . . . . . . . . . . . . . . . . . . . 10
          (nnn)  "SUBSIDIARY". . . . . . . . . . . . . . . . . . . . . . . . . . . 10
          (ooo)  "SUBSTITUTED COLLATERAL BONDS," . . . . . . . . . . . . . . . . . 10
          (ppp)  "SUBSTITUTED MORTGAGE INDENTURE". . . . . . . . . . . . . . . . . 10
          (qqq)  "TRUST INDENTURE ACT" . . . . . . . . . . . . . . . . . . . . . . 10
          (rrr)  "TRUSTEE" . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
          (sss)  "U.S. GOVERNMENT OBLIGATIONS" . . . . . . . . . . . . . . . . . . 10
          (ttt)  "VALUE" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
          (uuu)  "VICE PRESIDENT," . . . . . . . . . . . . . . . . . . . . . . . . 11

                                       -ii-
<PAGE>

<CAPTION>
                                                                                  PAGE
<S>                                                                               <C>
     SECTION 1.02.       Compliance Certificates and Opinions. . . . . . . . . . . 11
     SECTION 1.03.       Form of Documents Delivered to Trustee. . . . . . . . . . 12
     SECTION 1.04.       Acts of Holders.. . . . . . . . . . . . . . . . . . . . . 12
     SECTION 1.05.       Notices, Etc., to Trustee and Company.. . . . . . . . . . 13
     SECTION 1.06.       Notice to Holders; Waiver.. . . . . . . . . . . . . . . . 14
     SECTION 1.07.       Conflict with Trust Indenture Act.. . . . . . . . . . . . 14
     SECTION 1.08.       Effect of Headings and Table of Contents. . . . . . . . . 15
     SECTION 1.09.       Successors and Assigns. . . . . . . . . . . . . . . . . . 15
     SECTION 1.10.       Separability Clause.. . . . . . . . . . . . . . . . . . . 15
     SECTION 1.11.       Benefits of Indenture.. . . . . . . . . . . . . . . . . . 15
     SECTION 1.12.       Governing Law.. . . . . . . . . . . . . . . . . . . . . . 15
     SECTION 1.13.       Legal Holidays. . . . . . . . . . . . . . . . . . . . . . 15
     SECTION 1.14.       No Recourse Against Others. . . . . . . . . . . . . . . . 15

ARTICLE II       SECURITY FORMS. . . . . . . . . . . . . . . . . . . . . . . . . . 17
     SECTION 2.01.       Forms Generally.. . . . . . . . . . . . . . . . . . . . . 17
     SECTION 2.02.       Form of Face of Security. . . . . . . . . . . . . . . . . 17
     SECTION 2.03.       Form of Reverse of Security.. . . . . . . . . . . . . . . 20
     SECTION 2.04.       Form of Trustee's Certificate of Authentication.. . . . . 26
     SECTION 2.05.       Securities Issuable in the Form of a Global
                         Security. . . . . . . . . . . . . . . . . . . . . . . . . 26
     SECTION 2.06.       CUSIP Number. . . . . . . . . . . . . . . . . . . . . . . 28
     SECTION 2.07.       Payment of Securities.. . . . . . . . . . . . . . . . . . 28

ARTICLE III      THE SECURITIES. . . . . . . . . . . . . . . . . . . . . . . . . . 30
     SECTION 3.01.       Amount Unlimited; Issuable in Series. . . . . . . . . . . 30
     SECTION 3.02.       Denominations.. . . . . . . . . . . . . . . . . . . . . . 32
     SECTION 3.03.       Execution, Authentication, Delivery and Dating. . . . . . 32
     SECTION 3.04.       Temporary Securities. . . . . . . . . . . . . . . . . . . 35
     SECTION 3.05.       Registration, Registration of Transfer and Exchange.. . . 35
     SECTION 3.06.       Mutilated, Destroyed, Lost and Stolen Securities. . . . . 36
     SECTION 3.07.       Payment of Interest; Interest Rights Preserved. . . . . . 37
     SECTION 3.08.       Persons Deemed Owners . . . . . . . . . . . . . . . . . . 38
     SECTION 3.09.       Cancellation. . . . . . . . . . . . . . . . . . . . . . . 39
     SECTION 3.10.       Computation of Interest.. . . . . . . . . . . . . . . . . 39

ARTICLE IV       COLLATERAL BONDS; PLEDGED SUBSTITUTED COLLATERAL BONDS. . . . . . 40
     SECTION 4.01.       Delivery and Acceptance of Collateral Bonds . . . . . . . 40
     SECTION 4.02.       Terms of Collateral Bonds . . . . . . . . . . . . . . . . 40
     SECTION 4.03.       Collateral Bonds Held by the Trustee. . . . . . . . . . . 40
     SECTION 4.04.       No Transfer of Collateral Bonds; Exception. . . . . . . . 40
     SECTION 4.05.       Delivery to the Company of All Collateral Bonds . . . . . 41

                                       -iii-
<PAGE>

<CAPTION>
                                                                                  PAGE
<S>                                                                               <C>
     SECTION 4.06.       Further Assurances. . . . . . . . . . . . . . . . . . . . 41
     SECTION 4.07.       Exchange and Surrender of Collateral Bonds. . . . . . . . 41
     SECTION 4.08.       Collateral Bonds as Security for Securities;
                         Application of Payment on Collateral Bonds. . . . . . . . 42
     SECTION 4.09.       Substituted Collateral Bonds. . . . . . . . . . . . . . . 43
     SECTION 4.10.       Fair Value Certificate. . . . . . . . . . . . . . . . . . 44

ARTICLE V        SATISFACTION AND DISCHARGE. . . . . . . . . . . . . . . . . . . . 46
     SECTION 5.01.       Satisfaction and Discharge of Indenture.. . . . . . . . . 46
     SECTION 5.02.       Application of Trust Money. . . . . . . . . . . . . . . . 47

ARTICLE VI       REMEDIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
     SECTION 6.01.       Events of Default.. . . . . . . . . . . . . . . . . . . . 48
     SECTION 6.02.       Acceleration of Maturity and Rescission.. . . . . . . . . 49
     SECTION 6.03.       Collection of Indebtedness and Suits for
                         Enforcement by Trustee. . . . . . . . . . . . . . . . . . 50
     SECTION 6.04.       Trustee May File Proofs of Claim. . . . . . . . . . . . . 51
     SECTION 6.05.       Trustee May Enforce Claims Without Possession of
                         Securities. . . . . . . . . . . . . . . . . . . . . . . . 52
     SECTION 6.06.       Application of Money Collected. . . . . . . . . . . . . . 52
     SECTION 6.07.       Limitation on Suits.. . . . . . . . . . . . . . . . . . . 53
     SECTION 6.08.       Unconditional Right of Holders to Receive
                         Principal, Premium and Interest . . . . . . . . . . . . . 53
     SECTION 6.09.       Restoration of Rights and Remedies. . . . . . . . . . . . 54
     SECTION 6.10.       Rights and Remedies Cumulative. . . . . . . . . . . . . . 54
     SECTION 6.11.       Delay or Omission Not Waiver. . . . . . . . . . . . . . . 54
     SECTION 6.12.       Control by Holders. . . . . . . . . . . . . . . . . . . . 54
     SECTION 6.13.       Waiver of Past Defaults.. . . . . . . . . . . . . . . . . 55
     SECTION 6.14.       Undertaking for Costs.. . . . . . . . . . . . . . . . . . 55
     SECTION 6.15.       Defaults Under First Mortgage Indenture or
                         Substituted Mortgage Indenture. . . . . . . . . . . . . . 55

ARTICLE VII      THE TRUSTEE . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
     SECTION 7.01.       Certain Duties and Responsibilities of the Trustee. . . . 56
     SECTION 7.02.       Notice of Defaults. . . . . . . . . . . . . . . . . . . . 56
     SECTION 7.03.       Certain Rights of Trustee.. . . . . . . . . . . . . . . . 56
     SECTION 7.04.       Not Responsible for Recitals or Issuance of
                         Securities. . . . . . . . . . . . . . . . . . . . . . . . 57
     SECTION 7.05.       May Hold Securities.. . . . . . . . . . . . . . . . . . . 58
     SECTION 7.06.       Money Held in Trust.. . . . . . . . . . . . . . . . . . . 58
     SECTION 7.07.       Compensation and Reimbursement. . . . . . . . . . . . . . 58
     SECTION 7.08.       Disqualification; Conflicting Interests.. . . . . . . . . 59
     SECTION 7.09.       Corporate Trustee Required; Eligibility.. . . . . . . . . 59

                                       -iv-
<PAGE>

<CAPTION>
                                                                                  PAGE
<S>                                                                               <C>
     SECTION 7.10.       Resignation and Removal; Appointment of
                         Successor.. . . . . . . . . . . . . . . . . . . . . . . . 59
     SECTION 7.11.       Acceptance of Appointment by Successor. . . . . . . . . . 61
     SECTION 7.12.       Merger, Conversion, Consolidation or Succession to
                         Business. . . . . . . . . . . . . . . . . . . . . . . . . 62
     SECTION 7.13.       Preferential Collection of Claims Against
                         Company.. . . . . . . . . . . . . . . . . . . . . . . . . 62
     SECTION 7.14.       Appointment of Authenticating Agent.. . . . . . . . . . . 62

ARTICLE VIII     HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY . . . . . . . . 65
     SECTION 8.01.       Company to Furnish Trustee Names and Addresses of
                         Holders . . . . . . . . . . . . . . . . . . . . . . . . . 65
     SECTION 8.02.       Preservation of Information; Communications to
                         Holders . . . . . . . . . . . . . . . . . . . . . . . . . 65
     SECTION 8.03.       Reports by Trustee. . . . . . . . . . . . . . . . . . . . 66
     SECTION 8.04.       Reports by Company. . . . . . . . . . . . . . . . . . . . 67

ARTICLE IX       CONSOLIDATION, MERGER, LEASE, SALE OR TRANSFER. . . . . . . . . . 68
     SECTION 9.01.       Then Company May Merge, Etc.. . . . . . . . . . . . . . . 68
     SECTION 9.02.       Opinion of Counsel. . . . . . . . . . . . . . . . . . . . 68
     SECTION 9.03.       Successor Corporation Substituted.. . . . . . . . . . . . 68

ARTICLE X        SUPPLEMENTAL INDENTURES . . . . . . . . . . . . . . . . . . . . . 70
     SECTION 10.01.      Supplemental Indentures Without Consent of Holders. . . . 70
     SECTION 10.02.      Supplemental Indentures with Consent of Holders.. . . . . 71
     SECTION 10.03.      Execution of Supplemental Indentures. . . . . . . . . . . 72
     SECTION 10.04.      Effect of Supplemental Indentures.. . . . . . . . . . . . 72
     SECTION 10.05.      Conformity with Trust Indenture Act.. . . . . . . . . . . 72
     SECTION 10.06.      Reference in Securities to Supplemental Indentures. . . . 73

ARTICLE XI       COVENANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
     SECTION 11.01.      Payments of Principal and Interest. . . . . . . . . . . . 74
     SECTION 11.02.      Maintenance of Office or Agency.. . . . . . . . . . . . . 74
     SECTION 11.03.      Corporate Existence.. . . . . . . . . . . . . . . . . . . 74
     SECTION 11.04.      Payment of Taxes and Other Claims.. . . . . . . . . . . . 75
     SECTION 11.05.      Maintenance of Properties.. . . . . . . . . . . . . . . . 75
     SECTION 11.06.      Opinions of Counsel.. . . . . . . . . . . . . . . . . . . 75
     SECTION 11.07.      Compliance Certificates.. . . . . . . . . . . . . . . . . 76
     SECTION 11.08.      Waiver of Stay or Extension.. . . . . . . . . . . . . . . 76
     SECTION 11.09.      Money for Securities Payments to Be Held in Trust.. . . . 77
     SECTION 11.10.      Restrictions on Liens.. . . . . . . . . . . . . . . . . . 78
     SECTION 11.11.      Restrictions on Sale and Lease-Back Transactions. . . . . 80

                                       -v-
<PAGE>

<CAPTION>
                                                                                  PAGE
<S>                                                                               <C>
ARTICLE XII      REDEMPTION OF SECURITIES. . . . . . . . . . . . . . . . . . . . . 81
     SECTION 12.01.      Applicability of Article. . . . . . . . . . . . . . . . . 81
     SECTION 12.02.      Election to Redeem; Notice to Trustee.. . . . . . . . . . 81
     SECTION 12.03.      Election by Trustee of Securities to Be Redeemed. . . . . 81
     SECTION 12.04.      Notice of Redemption. . . . . . . . . . . . . . . . . . . 82
     SECTION 12.05.      Deposit of Redemption Price.. . . . . . . . . . . . . . . 82
     SECTION 12.06.      Securities Payable on Redemption Date.. . . . . . . . . . 83
     SECTION 12.07.      Securities Redeemed in Part.. . . . . . . . . . . . . . . 83

ARTICLE XIII     SINKING FUNDS . . . . . . . . . . . . . . . . . . . . . . . . . . 84
     SECTION 13.01.      Applicability of Article. . . . . . . . . . . . . . . . . 84
     SECTION 13.02.      Satisfaction of Sinking Fund Payments with
                         Securities. . . . . . . . . . . . . . . . . . . . . . . . 84
     SECTION 13.03.      Redemption of Securities for Sinking Fund.. . . . . . . . 84

ARTICLE XIV      DEFEASANCE AND COVENANT DEFEASANCE. . . . . . . . . . . . . . . . 85
     SECTION 14.01.      Applicability of Article; Company's Option to
                         Effect Defeasance or Covenant Defeasance. . . . . . . . . 85
     SECTION 14.02.      Defeasance and Discharge. . . . . . . . . . . . . . . . . 85
     SECTION 14.03.      Covenant Defeasance.. . . . . . . . . . . . . . . . . . . 85
     SECTION 14.04.      Conditions to Defeasance or Covenant Defeasance.. . . . . 86
     SECTION 14.05.      Deposited Money and Government Obligations To Be
                         Held In Trust . . . . . . . . . . . . . . . . . . . . . . 88

ARTICLE XV       MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . . 89
     SECTION 15.01.      Miscellaneous.. . . . . . . . . . . . . . . . . . . . . . 89

</TABLE>

                                       -vi-
<PAGE>

                                       
                     WISCONSIN PUBLIC SERVICE CORPORATION

       Reconciliation and tie between Trust Indenture Act of 1939

                and Indenture, dated as of December 1, 1998

<TABLE>
<CAPTION>
Trust Indenture
Act Section                                               Indenture Section
<S>                                                        <C>
 Section 310 (a) (1). . . . . . . . . . . . . . . . . . .      7.09
             (a) (2). . . . . . . . . . . . . . . . . . .      7.09
             (a) (3). . . . . . . . . . . . . . . . . . .      Not Applicable
             (a) (4). . . . . . . . . . . . . . . . . . .      Not Applicable
             (a) (5). . . . . . . . . . . . . . . . . . .      7.09
             (b). . . . . . . . . . . . . . . . . . . . .      7.08, 7.10
 Section 311 (a). . . . . . . . . . . . . . . . . . . . .      7.13
             (b). . . . . . . . . . . . . . . . . . . . .      7.13
 Section 312 (a). . . . . . . . . . . . . . . . . . . . .      8.01(a), 8.02(a)
             (b). . . . . . . . . . . . . . . . . . . . .      8.02(b)
             (c). . . . . . . . . . . . . . . . . . . . .      8.02(c)
 Section 313 (a). . . . . . . . . . . . . . . . . . . . .      8.03(a)
             (b). . . . . . . . . . . . . . . . . . . . .      8.03(b)
             (c). . . . . . . . . . . . . . . . . . . . .      8.03(a), 8.03(b)
             (d). . . . . . . . . . . . . . . . . . . . .      8.03(b)
 Section 314 (a). . . . . . . . . . . . . . . . . . . . .      8.04
             (b). . . . . . . . . . . . . . . . . . . . .      Not Applicable
             (c) (1). . . . . . . . . . . . . . . . . . .      1.02
             (c) (2). . . . . . . . . . . . . . . . . . .      1.02
             (c) (3). . . . . . . . . . . . . . . . . . .      Not Applicable
             (d). . . . . . . . . . . . . . . . . . . . .      4.10
             (e). . . . . . . . . . . . . . . . . . . . .      1.02
 Section 315 (a). . . . . . . . . . . . . . . . . . . . .      7.01(a)
             (b). . . . . . . . . . . . . . . . . . . . .      7.02
             (c). . . . . . . . . . . . . . . . . . . . .      7.01(b)
             (d). . . . . . . . . . . . . . . . . . . . .      7.01(c)
             (d) (1). . . . . . . . . . . . . . . . . . .      7.01(a), 7.01(c)
             (d) (2). . . . . . . . . . . . . . . . . . .      7.01(c)
             (d) (3). . . . . . . . . . . . . . . . . . .      7.01(c)
             (e). . . . . . . . . . . . . . . . . . . . .      6.14
 Section 316 (a) (1) (A). . . . . . . . . . . . . . . . .      6.12
             (a) (1) (B). . . . . . . . . . . . . . . . .      6.02, 6.13
             (a) (2). . . . . . . . . . . . . . . . . . .      Not Applicable
             (b). . . . . . . . . . . . . . . . . . . . .      6.08
 Section 317 (a) (1). . . . . . . . . . . . . . . . . . .      6.03
             (a) (2). . . . . . . . . . . . . . . . . . .      6.04
             (b). . . . . . . . . . . . . . . . . . . . .      11.09
 Section 318 (a). . . . . . . . . . . . . . . . . . . . .      1.07

</TABLE>

- -----------------------
NOTE:  This reconciliation and tie shall not, for any purpose, be deemed to be a
part of this Indenture.

                                     -vii-
<PAGE>

          INDENTURE, dated as of December 1, 1998, between WISCONSIN PUBLIC 
SERVICE CORPORATION, a corporation duly organized and existing under the laws 
of the State of Wisconsin (herein called the "COMPANY"), having its principal 
office at 700 North Adams Street, Green Bay, Wisconsin 54301 and Firstar Bank 
Milwaukee, N.A., National Association, a national banking association 
organized and existing under and by virtue of the laws of the United States, 
as Trustee (herein called the "TRUSTEE").

                               RECITALS OF THE COMPANY

          The Company has duly authorized the execution and delivery of this 
Indenture to provide for the issuance from time to time of its senior 
debentures, notes or other evidences of indebtedness (herein called the 
"SECURITIES"), to be issued in one or more series as in this Indenture 
provided.

          Subject to the provisions of Section 4.08 hereof, the Company may 
issue First Mortgage Bonds (as hereinafter defined) and issue and deliver 
Collateral Bonds to the Trustee to hold in trust for the benefit of the 
respective Holders (as hereinafter defined) from time to time of the Related 
Series of Securities.  Any payment by the Company of principal of, premium, 
if any, and interest on, a series of First Mortgage Bonds will be applied by 
the Trustee to satisfy the Company's obligations with respect to the 
principal of, premium, if any, and interest on, the Related Series of 
Securities.  Pursuant to the terms and provisions hereof, the Company may 
issue and deliver to the Trustee additional First Mortgage Bonds for such 
purpose or require the Trustee to deliver to the Company for cancellation any 
and all Collateral Bonds held by the Trustee.

          All things necessary to make this Indenture a valid agreement of 
the Company, in accordance with its terms, has been done.

          NOW, THEREFORE, THIS INDENTURE WITNESSETH:

          For and in consideration of the premises and the purchase of the 
Securities by the Holders thereof, it is mutually covenanted and agreed, for 
the equal and proportionate benefit of all Holders of the Securities or of 
series thereof, as follows: 

                                       
<PAGE>

                                    ARTICLE I

                         DEFINITIONS AND OTHER PROVISIONS
                              OF GENERAL APPLICATION

          SECTION 1.01.   DEFINITIONS.

          For all purposes of this Indenture, except as otherwise expressly 
provided or unless the context otherwise requires:

          (1)     the terms defined in this Article have the meanings assigned
     to them in this Article and include the plural as well as the singular;

          (2)     all other terms used herein which are defined in the Trust
     Indenture Act, either directly or by reference therein, have the meanings
     assigned to them therein;

          (3)     all accounting terms not otherwise defined herein have the
     meanings assigned to them in accordance with GAAP;

          (4)     the word "INCLUDING" (and with correlative meaning "INCLUDE")
     means including, without limiting the generality of, any description
     preceding such term; and

          (5)     the words "HEREIN," "HEREOF" and "HEREUNDER" and other words
     of similar import refer to this Indenture as a whole and not to any
     particular Article, Section or other subdivision.

     Certain terms, used principally in Article Seven, are defined in that
     Article.

          (a)     "ACT," when used with respect to any Holder, has the 
meaning specified in Section 1.04.

          (b)     "AFFILIATE" of any specified Person means any other Person 
directly or indirectly controlling or controlled by or under direct or 
indirect common control with such specified Person.  For the purposes of this 
definition, "control" when used with respect to any specified Person means 
the power to direct the management and policies of such Person, directly or 
indirectly, whether through the ownership of voting securities, by contract 
or otherwise; and the terms "controlling" and "controlled" have meanings 
correlative to the foregoing.

          (c)     "AUTHENTICATING AGENT" means any Person authorized by the 
Trustee to act on behalf of the Trustee to authenticate Securities.

          (d)     "BANKRUPTCY LAW" means Title 11, U.S. Code or any similar 
federal or state law for the relief of debtors.

                                      -2-
<PAGE>

          (e)     "BOARD OF DIRECTORS" means the board of directors of the 
Company; provided, however, that when the context refers to actions or 
resolutions of the Board of Directors, then the term "Board of Directors" 
shall also mean any duly authorized committee of the Board of Directors of 
the Company or Officer authorized to act with respect to any particular 
matter to exercise the power of the Board of Directors of the Company.

          (f)     "BOARD RESOLUTION" means a copy of a resolution certified 
by the Secretary or an Assistant Secretary of the Company to have been duly 
adopted by the Board of Directors and to be in full force and effect on the 
date of such certification, and delivered to the Trustee.

          (g)     "BONDHOLDER" shall mean the Person in whose name a First 
Mortgage Bond is registered in the bond register therefor.

          (h)     "BUSINESS DAY," when used with respect to any Place of 
Payment, means each Monday, Tuesday, Wednesday, Thursday and Friday which is 
not a day on which banking institutions in that Place of Payment are 
authorized or obligated by law or regulation to close.

          (i)      "CAPITAL LEASE" shall mean any lease which has been or 
would be capitalized on the books of the lessee in accordance with GAAP.

          (j)     "CAPITALIZATION" shall mean the total of all the following 
items appearing on, or included in, the consolidated balance sheet of the 
Company:  (i) liabilities for indebtedness maturing more than twelve (12) 
months from the date of determination; and (ii) common stock, preferred 
stock, Hybrid Preferred Securities, premium on capital stock, capital 
surplus, capital in excess of par value, and retained earnings (however the 
foregoing may be designated), less, to the extent not otherwise deducted, the 
cost of shares of capital stock of the Company held in its treasury.  Subject 
to the foregoing, Capitalization shall be determined in accordance with 
generally accepted accounting principles and practices applicable to the type 
of business in which the Company is engaged and that are approved by 
independent accountants regularly retained by the Company, and may be 
determined as of a date nor more than sixty (60) days prior to the happening 
of an event for which such determination is being made.

          (k)     "COLLATERAL BONDS," shall mean any First Mortgage Bonds 
issued by the Company under the First Mortgage Indenture and issued and 
delivered to the Trustee pursuant to Section 4.01.

          (l)     "COMMISSION" means the Securities and Exchange Commission, 
as from time to time constituted, created under the Exchange Act, or, if at 
any time after the execution of this instrument such Commission is not 
existing and performing the duties now assigned to it under the Trust 
Indenture Act, then the body performing such duties at such time.

                                      -3-
<PAGE>

          (m)     "COMPANY" means the Person named as the "Company" in the 
first paragraph of this Indenture until a successor corporation shall have 
become such pursuant to the applicable provisions of this Indenture, and 
thereafter "Company" shall mean such successor corporation.

          (n)     "COMPANY REQUEST" or "COMPANY ORDER" means a written 
request or order signed in the name of the Company by its Chairman of the 
Board, its President or a Vice President, and by its Treasurer, an Assistant 
Treasurer, its Controller, an Assistant Controller, its Secretary or an 
Assistant Secretary, and delivered to the Trustee.

          (o)     "CORPORATE TRUST OFFICE" means the principal office of the 
Trustee at which at any time its corporate trust business shall be 
administered, which office at the date hereof is located at 1555 North 
RiverCenter Drive, Suite 301, P.O. Box 2077, Milwaukee, Wisconsin 53201-2077, 
Attention:  Corporate Trust Department, or such other address as the Trustee 
may designate from time to time by notice to the Holders and the Company, or 
the principal corporate trust office of any successor Trustee (or such other 
address as a successor Trustee may designate from time to time by notice to 
the Holders and the Company).

          (p)     "COVENANT DEFEASANCE" has the meaning specified in Section 
14.03.

          (q)     "CUSTODIAN" means any receiver, trustee, assignee, 
liquidator, sequestrator or similar official under any Bankruptcy Law.

          (r)     "DEBT" means any outstanding debt for money borrowed 
evidenced by notes, debentures, bonds or other securities or guarantees of 
any thereof.

          (s)     "DEFAULT" means any event which is, or after notice or 
passage of time or both would be, an Event of Default.

          (t)     "DEFAULTED INTEREST" has the meaning specified in Section 
3.07.

          (u)     "DEFEASANCE" has the meaning specified in Section 14.02.

          (v)     "DEPOSITARY" shall mean, unless otherwise specified 
pursuant to Section 3.01 hereof, The Depository Trust Company, New York, New 
York, or any successor thereto registered or qualified as a clearing agency 
under the Securities Exchange Act of 1934, or other applicable statute or 
regulation.

          (w)     "DOLLARS" and "$" means lawful money of the United States 
of America.

          (x)     "EVENT OF DEFAULT" has the meaning specified in Section 
6.01.

                                      -4-
<PAGE>

          (y)     "EXCHANGE ACT" means the Securities and Exchange Act of 
1934, as amended from time to time, and the rules and regulations promulgated 
thereunder.

          (z)     "EXPERT" shall mean any officer of the Company familiar 
with the terms of the First Mortgage Indenture and this Indenture, any law 
firm, any investment banking firm or any other Person satisfactory in the 
reasonable judgment of the Trustee.

          (aa)    "FIRST MORTGAGE BONDS" shall mean all First Mortgage Bonds 
issued by the Company and outstanding under the First Mortgage Indenture or 
the Substituted Mortgage Indenture, including in all events any Collateral 
Bonds or Substituted Collateral Bonds issued and delivered to and held by the 
Trustee.

          (bb)    "FIRST MORTGAGE INDENTURE" shall mean the First Mortgage 
and Deed of Trust dated January 1, 1941, to First Wisconsin Trust Company 
(succeeded by Firstar Bank Milwaukee, N.A., National Association), Milwaukee, 
Wisconsin, as supplemented and amended by the supplemental indentures thereto.

          (cc)    "GAAP" shall mean generally accepted accounting principles 
in the United States of America as in effect on the date hereof, applied on a 
basis consistent with those used in the preparation of any financial 
statements referred to herein, unless otherwise stated herein.

          (dd)    "GLOBAL SECURITY" shall mean a Security that, pursuant to 
Sections 3.01 and 3.03 hereof, is issued to evidence Securities, that is 
delivered to the Depositary or pursuant to the instructions of the Depositary 
and that shall be registered in the name of the Depositary or its nominee.

          (ee)    "HOLDER" or "SECURITY HOLDER" means a Person in whose name 
a Security is registered in the Security Register.

          (ff)    "HYBRID PREFERRED SECURITIES" shall mean any preferred 
securities issued by a Hybrid Preferred Securities Subsidiary, where such 
preferred securities have the following characteristics:

          (i)     such Hybrid Preferred Securities Subsidiary lends
     substantially all of the proceeds from the issuance of such preferred
     securities to the Company in exchange for Junior Subordinated Indebtedness
     issued by the Company;

          (ii)    such preferred securities contain terms providing for the
     deferral of interest payments corresponding to provisions providing for the
     deferral of interest payments on the Junior Subordinated Indebtedness; and

          (iii)   the Company makes period interest payments on the Junior
     Subordinated Indebtedness, which interest payments are in turn used by the
     Hybrid Preferred Securities Subsidiary to make corresponding payments to
     the holders of the preferred securities.

                                      -5-
<PAGE>


          (gg)    "HYBRID PREFERRED SECURITIES SUBSIDIARY" shall mean any 
business trust (or similar entity) (i) all of the common equity interest of 
which is owned (either directly or indirectly through one or more 
wholly-owned Subsidiaries of the Company or any Consolidated Subsidiary of 
the Company) at all times by the Company, (ii) that has been formed for the 
purpose of issuing Hybrid Preferred Securities and (iii) substantially all of 
the assets of which consist at all times solely of Junior Subordinated 
Indebtedness issued by the Company and payments made from time to time on 
such Junior Subordinated Indebtedness.

          (hh)     "INDENTURE" means this instrument as originally executed 
or as it may from time to time be supplemented or amended by one or more 
indentures supplemental hereto entered into pursuant to the applicable 
provisions hereof and shall include the terms of particular series of 
Securities established as contemplated by Section 3.01.

          (ii)    "INITIAL SECURITIES" shall mean Securities in an aggregate 
principal amount of $50,000,000 authenticated and delivered upon the 
execution of this Indenture.

          (jj)    "INTEREST," when used with respect to an Original Issue 
Discount Security which by its terms bears interest only after Maturity, 
means interest payable after Maturity.

          (kk)    "INTEREST PAYMENT DATE," when used with respect to any 
Security, means the Stated Maturity of an installment of interest on such 
Security.

          (ll)    "JUNIOR SUBORDINATED INDEBTEDNESS" shall mean any unsecured 
Debt of the Company (i) issued in exchange for the proceeds of Hybrid 
Preferred Securities and (ii) subordinated to the rights of the Holders 
hereunder.

          (mm)    "LIEN," means any lien (statutory or other), mortgage, 
pledge, hypothecation, assignment, deposit arrangement, encumbrance or 
preference, priority or other security agreement or preferential arrangement 
of any kind or nature whatsoever (including, without limitation, the interest 
of a vendor or lessor under any conditional sale, capitalized lease or other 
title retention agreement).

          (nn)    "MATURITY," when used with respect to any Security, means 
the date on which the principal of such Security or an installment of 
principal becomes due and payable as therein or herein provided, whether at 
the Stated Maturity or by declaration of acceleration, call for redemption or 
otherwise.

          (oo)    "MORTGAGE," shall mean and include any mortgage, pledge, 
lien or security interest.

          (pp)    "MORTGAGE TRUSTEE," shall mean the Person serving as 
trustee at the time under the First Mortgage Indenture.

          (qq)    "NET TANGIBLE ASSETS" shall mean the amount shown as total 
assets on the consolidated balance sheet of the Company, less the following: 
(i) intangible 

                                      -6-
<PAGE>

assets including, but without limitation, such items as goodwill, trademarks, 
trade names, patents, and unamortized debt discount and expense and (ii) 
appropriate adjustments, if any, on account of minority interests.  Net 
Tangible Assets shall be determined in accordance with generally accepted 
accounting principles and practices applicable to the type of business in 
which the Company is engaged and that are approved by the independent 
accountants regularly retained by the Company, and may be determined as of a 
date not more than sixty (60) days prior to the happening of the event for 
which such determination is being made.

          (rr)    "OFFICER" means the Chairman of the Board, the 
Vice-Chairman of the Board, the President, any Vice President, the Treasurer, 
any Assistant Treasurer, the Controller, the Secretary or any Assistant 
Secretary of the Company.

          (ss)    "OFFICER'S CERTIFICATE" means a certificate signed by an 
Officer and delivered to the Trustee.

          (tt)    "OPERATING PROPERTY" shall mean (i) any interest in real 
property owned by the Company and (ii) any asset owned by the Company that is 
depreciable in accordance with GAAP, excluding, in either case, any interest 
of the Company as lessee under a Capital Lease (except for a lease that 
results from a Sale and Lease-Back Transaction).

          (uu)    "OPINION OF COUNSEL" means a written opinion of counsel, 
who may be an employee of or counsel for the Company, and who shall be 
reasonably acceptable to the Trustee.

          (vv)    "ORIGINAL ISSUE DISCOUNT SECURITY" means any Security, 
which provides for an amount less than the principal amount thereof to be due 
and payable upon a declaration of acceleration of the Maturity thereof 
pursuant to Section 6.02.

          (ww)    "OUTSTANDING," when used with respect to Securities or 
Securities of any series, means, as of the date of determination, all such 
Securities theretofore authenticated and delivered under this Indenture, 
except:

          (i)   Securities theretofore cancelled by the Trustee or delivered 
     to the Trustee for cancellation;

          (ii)  Securities, or portions thereof, for whose payment or 
     redemption money in the necessary amount has been theretofore deposited 
     with the Trustee or any Paying Agent (other than the Company) in trust 
     or set aside and segregated in trust by the Company (if the Company 
     shall act as its own Paying Agent) for the Holders of such Securities; 
     provided that, if such Securities are to be redeemed, notice of such 
     redemption has been duly given pursuant to this Indenture or provision 
     therefor satisfactory to the Trustee has been made;

          (iii) Securities which have been paid pursuant to Section 3.06 or 
     in exchange for or in lieu of which other Securities have been 
     authenticated and delivered pursuant to this Indenture, other than any 
     such Securities in respect of which there shall have 

                                     -7-
<PAGE>

     been presented to the Trustee proof satisfactory to it that such 
     Securities are held by a bona fide purchaser in whose hands such 
     Securities are valid obligations of the Company; and

          (iv)  Securities which have been defeased pursuant to Section 14.02;

provided, however, that in determining whether the Holders of the requisite 
principal amount of the Outstanding Securities have given any request, 
demand, authorization, direction, notice, consent or waiver hereunder, (a) 
the principal amount of an Original Issue Discount Security that shall be 
deemed to be Outstanding for such purposes shall be that portion of the 
principal amount thereof that could be declared to be due and payable upon 
the occurrence of an Event of Default and the continuation thereof pursuant 
to the terms of such Original Issue Discount Security as of the date of such 
determination and (b) Securities owned by the Company or any other obligor 
upon the Securities or any Affiliate of the Company or of such other obligor 
shall be disregarded and deemed not to be Outstanding, except that, in 
determining whether the Trustee shall be protected in relying upon any such 
request, demand, authorization, direction, notice, consent or waiver, only 
Securities which the Trustee knows to be so owned shall be so disregarded.  
Securities so owned which have been pledged in good faith may be regarded as 
Outstanding if the pledge establishes to the satisfaction of the Trustee the 
pledge's right so to act with respect to such Securities and that the pledgee 
is not the Company or any other obligor upon the Securities or any Affiliate 
of the Company or of such other obligor.

          (xx)    "PAYING AGENT" means any Person authorized by the Company 
to pay the principal of (and premium, if any) or interest on any Securities 
on behalf of the Company.  The Company may act as Paying Agent with respect 
to any Securities issued hereunder.

          (yy)    "PERSON" means any individual, corporation, partnership, 
joint venture, association, joint-stock company, trust, unincorporated 
organization or government or any agency or political subdivision thereof.

          (zz)    "PLACE OF PAYMENT," when used with respect to the 
Securities of any series, means the place or places where the principal of 
(and premium, if any) and interest on the Securities of that series are 
payable as specified as contemplated by Section 3.01.

          (aaa)    "REDEMPTION DATE," when used with respect to any Security 
of any series to be redeemed, means the date fixed for such redemption by or 
pursuant to this Indenture.

          (bbb)   "REDEMPTION PRICE," when used with respect to any Security 
of any series to be redeemed, means the price at which it is to be redeemed 
pursuant to this Indenture.

          (ccc)   "REGULAR RECORD DATE" for the interest payable on any 
Interest Payment Date on the Securities of any series means the date 
specified for that purpose as contemplated by Section 3.01.

                                      -8-
<PAGE>

          (ddd)   "RELATED SERIES OF COLLATERAL BONDS" shall mean, when used 
in reference to a series of Securities, the series of Collateral Bonds, 
having the same stated rate or rates of interest (or interest calculated in 
the same manner), Interest Payment Dates, stated maturity date and redemption 
provisions, and in the same aggregate principal amount, delivered to the 
Trustee pursuant to Section 4.01 in connection with the initial 
authentication and issuance of such Securities pursuant to Section 3.03.

          (eee)   "RELATED SERIES OF SECURITIES" shall mean, when used in 
reference to a series of Collateral Bonds or Substituted Collateral Bonds, 
the series of Securities in respect of which such series of Collateral Bonds 
or Substituted Collateral Bonds was delivered to the Trustee pursuant to 
Section 4.01 or 4.09 hereof upon the initial issuance and authentication of 
such series of Securities pursuant to Section 3.03 hereof.

          (fff)   "RELATED SERIES OF SUBSTITUTED COLLATERAL BONDS" shall 
mean, when used in reference to a series of Securities, the series of 
Substituted Collateral Bonds, having the same stated rate or rates of 
interest (or interest calculated in the same manner), Interest Payment Dates, 
stated maturity date and redemption provisions, and in the same aggregate 
principal amount, delivered to the Trustee pursuant to Section 4.09.

          (ggg)   "RELEASE DATE" shall mean the date as of which all First 
Mortgage Bonds, other than Collateral Bonds, 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, provided that no Default 
or Event of Default has occurred and is continuing.

          (hhh)   "RESPONSIBLE OFFICER," when used with respect to the 
Trustee, means any vice president, any assistant vice president, the 
secretary, any assistant secretary, the treasurer, any assistant treasurer, 
the cashier, any assistant cashier, any senior trust officer, any trust 
officer or assistant trust officer, the controller or any assistant 
controller or any other officer of the Trustee customarily performing 
functions similar to those performed by any of the above designated officers 
and also means, with respect to a particular corporate trust matter, any 
other officer to whom such matter is referred because of his knowledge of and 
familiarity with the particular subject.

          (iii)   "SALE AND LEASE-BACK TRANSACTION" shall mean any 
arrangement with any Person providing for the leasing to the Company of any 
Operating Property (except for leases for a term, including any renewal 
thereof, of not more than forty-eight (48) months), which Operating Property 
has been or is to be sold or transferred by the Company to such Person; 
PROVIDED, HOWEVER, Sale and Lease-Back Transaction shall not include any 
arrangement first entered into prior to the date of this Indenture and shall 
not include any transaction pursuant to which the Company sells Operating 
Property to, and thereafter purchases energy or services from, any entity 
which transaction is ordered or authorized by any regulatory authority having 
jurisdiction over the Company or its operations or is entered into pursuant 
to any plan or program of industry restructuring ordered or authorized by any 
such regulatory authority.

                                      -9-
<PAGE>

          (jjj)   "SECURITIES" has the meaning stated in the first recital of 
this Indenture and more particularly means any Securities authenticated and 
delivered under this Indenture.

          (kkk)   "SECURITY REGISTER" and "SECURITY REGISTRAR" have the 
respective meanings specified in Section 3.05.

          (lll)   "SPECIAL RECORD DATE" for the payment of any Defaulted 
Interest means a date fixed by the Trustee pursuant to Section 3.07.

          (mmm)   "STATED MATURITY," when used with respect to any Security 
or any installment of principal thereof or interest thereon, means the date 
specified in such Security as the fixed date on which the principal of such 
Security or such installment of principal or interest is due and payable.

          (nnn)   "SUBSIDIARY" of a Person means (i) any corporation of which 
more than 50% of the outstanding securities having ordinary voting power 
shall at the time be owned or controlled, directly or indirectly, by such 
Person or by one or more of its Subsidiaries or by such Person and one or 
more of its Subsidiaries, or (ii) any partnership, association, joint venture 
or similar business organization of which more than 50% of the ownership 
interests having ordinary voting power shall at the time be so owned or 
controlled.  Unless otherwise expressly provided, all references herein to a 
"Subsidiary" shall mean a Subsidiary of the Company.

          (ooo)   "SUBSTITUTED COLLATERAL BONDS," shall mean any mortgage 
bonds issued by the Company under a Substituted Mortgage Indenture and 
delivered to the Trustee pursuant to Section 4.09 hereof.

          (ppp)   "SUBSTITUTED MORTGAGE INDENTURE" shall mean a mortgage 
indenture of the Company designated by the Company to the Trustee as a 
Substituted Mortgage Indenture pursuant to Section 4.09.

          (qqq)   "TRUST INDENTURE ACT" means the Trust Indenture Act of 
1939, as amended, as in force at the date as of which this Indenture was 
executed; provided, however, that in the event that such Act is amended after 
such date, "TRUST INDENTURE ACT" means the Trust Indenture Act of 1939 as so 
amended.

          (rrr)   "TRUSTEE" means the Person named as the "Trustee" in the 
first paragraph of this instrument until a successor Trustee shall have 
become such pursuant to the applicable provisions of this Indenture, and 
thereafter "Trustee" shall mean or include each Person who is then a Trustee 
hereunder, and if at any time there is more than one such Person, "Trustee" 
as used with respect to the Securities of any series shall mean the Trustee 
with respect to Securities of that series.

          (sss)    "U.S. GOVERNMENT OBLIGATIONS" means securities which are 
(i) direct obligations of the United States of America for the payment of 
which its full faith and 

                                     -10-
<PAGE>

credit is pledged or (ii) obligations of a Person controlled or supervised by 
and acting as an agency or instrumentality of the United States of America 
the timely payment of which is unconditionally guaranteed by the full faith 
and credit of the United States of America which, in either case, are not 
callable or redeemable at the option of the issuer thereof or otherwise 
subject to prepayment, and shall also include a depository receipt issued by 
a New York Clearing House bank or trust company as custodian with respect to 
any such U.S. Government Obligation or a specific payment or interest on or 
principal of any such U.S. Government Obligation held by such custodian for 
the account of the holder of a depository receipt, provided that (except as 
required by law) such custodian is not authorized to make any deduction from 
the amount payable to the holder of such depository receipt or from any 
amount held by the custodian in respect of the U.S. Government Obligation or 
the specific payment of interest on or principal of the U.S. Government 
Obligation evidenced by such depository receipt.

          (ttt)   "VALUE" shall mean, with respect to a Sale and Lease-Back 
Transaction, as of any particular time, the amount equal to the greater of 
(i) the net proceeds to the Company from the sale or transfer of the property 
leased pursuant to such Sale and Lease-Back Transaction or (ii) the net book 
value of such property, as determined in accordance with generally accepted 
accounting principles by the Company at the time of entering into such Sale 
and Lease-Back transaction, in either case multiplied by a fraction, the 
numerator of which shall be equal to the number of full years of the term of 
the lease that is part of such Sale and Lease-Back Transaction remaining at 
the time of determination and the denominator of which shall be equal to the 
number of full years of such term, without regard to any renewal or extension 
options contained in such lease.

          (uuu)   "VICE PRESIDENT," when used with respect to the Company or 
the Trustee, means any vice president, whether or not designated by a number 
or a word or words added before or after the title "vice president".

          SECTION 1.02.   COMPLIANCE CERTIFICATES AND OPINIONS.

          Upon any application or request by the Company to the Trustee to 
take any action under any provision of this Indenture, other than as action 
permitted by Sections 2.05 and 8.04, the Company shall furnish to the Trustee 
an Officer's Certificate stating that all conditions precedent, if any, 
provided for in this Indenture relating to the proposed action have been 
complied with and an Opinion of Counsel stating that in the opinion of such 
counsel all such conditions precedent, if any, have been complied with, 
except that in the case of any such application or request as to which the 
furnishing of such documents is specifically required by any provision of 
this Indenture relating to such particular application or request, no 
additional certificate or opinion need be furnished.

          Every certificate or opinion with respect to compliance with a 
condition or covenant provided for in this Indenture shall include:

                                     -11-
<PAGE>

          (a)     a statement that each individual signing such certificate 
or opinion has read such covenant or condition and the definitions herein 
relating thereto;

          (b)     a brief statement as to the nature and scope of the 
examination or investigation upon which the statements or opinions contained 
in such certificate or opinion are based;

          (c)     a statement that, in the opinion of each such individual, 
he has made such examination or investigation as is necessary to enable him 
to express an informed opinion as to whether or not such covenant or 
condition has been complied with; and

          (d)     a statement as to whether, in the opinion or each such 
individual, such condition or covenant has been complied with.

          SECTION 1.03.   FORM OF DOCUMENTS DELIVERED TO TRUSTEE.

          In any case where several matters are required to be certified by, 
or covered by a opinion of, any specified Person, it is not necessary that 
all such matters be certified by, or covered by the opinion of, only one such 
Person, or that they be so certified or covered by only one document, but one 
such Person may certify or give an opinion with respect to some matters and 
one or more other such Persons as to other matters, and any such Person may 
certify or give an opinion as to such matters in one or several documents.

Any certificate or opinion of an Officer may be based, insofar as it relates 
to legal matters, upon a certificate or opinion of, or representations by, 
counsel, unless such Officer knows, or in the exercise of reasonable care 
should know, that the certificate or Opinion of Counsel may be based, insofar 
as it relates to factual matters, upon a certificate or opinion of, or 
representations by, an Officer or Officers of the Company stating that the 
information with respect to such factual matters is in the possession of the 
Company, unless such counsel knows, or in the exercise of reasonable care 
should know, that the certificate or opinion or representations with respect 
to such matters are erroneous.

          Where any Person is required to make, give or execute two or more 
applications, requests, consents, certificates, statements, opinions or other 
instruments under this Indenture, they may, but need not, be consolidated and 
form one instrument.

          SECTION 1.04.   ACTS OF HOLDERS.

          (a)     Any request, demand, authorization, direction, notice, 
consent, waiver or other action provided by this Indenture to be given or 
taken by Holders may be embodied in and evidenced by one or more instruments 
of substantially similar tenor signed by such Holders in person or by agents 
duly appointed in writing; and, except as herein otherwise expressly 
provided, such action shall become effective when such instrument or 
instruments are delivered to the Trustee and, where it is hereby expressly 
required, to the Company.  Such instrument or instruments (and the action 
embodied therein and evidenced thereby) are herein sometimes referred to as 
the "ACT" of the Holders signing such instrument or instruments.  

                                      -12-
<PAGE>

Proof of execution of any such instrument or of a writing appointing any such 
agent shall be sufficient for any purpose of this Indenture and (subject to 
Section 6.01) conclusive in favor of the Trustee and the Company, if made in 
the manner provided in this Section.

          (b)     The fact and date of the execution by any Person of any 
such instrument or writing may be proved by the affidavit of a witness of 
such execution or by a certificate of a notary public or other officer 
authorized by law to take acknowledgments of deeds, certifying that the 
individual signing such instrument or writing acknowledged to him the 
execution thereof.  Where such execution is by a signer acting in a capacity 
other than his individual capacity, such certificate or affidavit shall also 
constitute sufficient proof of his authority.  The fact and date of the 
execution of any such instrument or writing, or the authority of the Person 
executing the same, may also be proved in any other manner, which the Trustee 
deems sufficient.

          (c)     The ownership of Registered Securities shall be proved by 
the Security Register.

          (d)     Any request, demand, authorization, direction, notice, 
consent, waiver or other Act of the Holder of any Security shall bind every 
future Holder of the same Security and the Holder of every Security issued 
upon the registration of transfer thereof or in exchange therefor or in lieu 
thereof in respect of anything done, omitted or suffered to be done by the 
Trustee or the Company in reliance thereon, whether or not notation of such 
action is made upon such Security.

          (e)     If the Company shall solicit from the Holders any request, 
demand, authorization, direction, notice, consent, waiver or other Act, the 
Company may, at its option, by or pursuant to a Board Resolution, fix in 
advance a record date for the determination of Holders entitled to give such 
request, demand, authorization, direction, notice, consent, waiver or other 
Act, but the Company shall have no obligation to do so.  If such a record 
date is fixed, such request, demand, authorization, direction, notice, 
consent, waiver or other Act may be given before or after such record date, 
but only the Holders of record at the close of business on such record date 
shall be deemed to be Holders for the purposes of determining whether Holders 
of the requisite proportion of Outstanding Securities have authorized or 
agreed or consented to such request, demand, authorization, direction, 
notice, consent, waiver or other Act, and for that purpose the Outstanding 
Securities shall be computed as of such record date; provided that no such 
authorization, agreement or consent by the Holders on such record date shall 
be deemed effective unless it shall become effective pursuant to the 
provisions of this Indenture not later than six months after the record date.

          SECTION 1.05.   NOTICES, ETC., TO TRUSTEE AND COMPANY.

          Any request, demand, authorization, direction, notice, consent, 
waiver or Act of Holders or other document provided or permitted by this 
Indenture to be made upon, given or furnished to, or filed with,

                                     -13-
<PAGE>


          (i)     the Trustee by any Holder or by the Company shall be
     sufficient for every purpose hereunder if made, given, furnished or filed
     in writing to or with the Trustee and received by the Trustee at its
     Corporate Trust Office, Attention: Corporate Trust Department or

          (ii)    the Company by the Trustee or by any Holder shall be
     sufficient for every purpose hereunder (unless otherwise herein expressly
     provided) if in writing and mailed, first-class postage prepaid, to the
     Company addressed to it at the address of its principal office specified in
     the first paragraph of this Indenture, attention:  Secretary, or at any
     other address previously furnished in writing to the Trustee by the
     Company.

          SECTION 1.06.   NOTICE TO HOLDERS; WAIVER.

          Where this Indenture or any Security provides for notice to Holders 
of any event, such notice shall be deemed sufficiently given (unless 
otherwise herein or in such Security expressly provided) if in writing and 
mailed, first-class postage prepaid, to each Holder affected by such event, 
at his address as it appears in the Security Register, not later than the 
latest date, and not earlier than the earliest date, prescribed for the 
giving of such notice.  In any case where notice to Holders is given by mail, 
neither the failure to mail such notice, nor any defect in any notice so 
mailed, to any particular Holder shall affect the sufficiency of such notice 
with respect to other Holders or the validity of the proceedings to which 
such notice relates.  Where this Indenture or any Security provides for 
notice in any manner, such notice may be waived in writing by the Person 
entitled to receive such notice, either before or after the event, and such 
waiver shall be the equivalent of such notice.  Waivers of notice by Holders 
shall be filed with the Trustee, but such filing shall not be a condition 
precedent to the validity of any action taken in reliance upon such waiver.

          In case by reason of the suspension of regular mail service or by 
reason of any other cause it shall be impracticable to give such notice by 
mail, then such notification as shall be made with the approval of the 
Trustee shall constitute a sufficient notification for every purpose 
hereunder.

          Any request, demand, authorization, direction, notice, consent or 
waiver required or permitted under this Indenture shall be in the English 
language, except that any published notice may be in an official language of 
the country of publication.

          SECTION 1.07.   CONFLICT WITH TRUST INDENTURE ACT.

          If any provision hereof limits, qualifies or conflicts with another 
provision hereof which is required to be included in this Indenture by any of 
the provisions of the Trust Indenture Act, such required provision shall 
control.  If any provision of this Indenture modifies or excludes any 
provision of the Trust Indenture Act that may be so modified or excluded, the 
latter provision shall be deemed to apply to this Indenture as so modified or 
shall be excluded, as the case may be.

                                     -14-
<PAGE>

          SECTION 1.08.   EFFECT OF HEADINGS AND TABLE OF CONTENTS.

          The Article and Section headings herein and the Table of Contents 
are for convenience only and shall not affect the construction hereof.

          SECTION 1.09.   SUCCESSORS AND ASSIGNS.

          All covenants and agreements in this Indenture by the Company shall 
bind its successors and assigns, whether so expressed or not.

          SECTION 1.10.   SEPARABILITY CLAUSE.

          In case any provision in this Indenture or in the Securities shall 
be invalid, illegal or unenforceable, the validity, legality and 
enforceability of the remaining provisions shall not in any way be affected 
or impaired thereby.

          SECTION 1.11.   BENEFITS OF INDENTURE.

          Nothing in this Indenture or in the Securities, express or implied, 
shall give to any Person, other than the parties hereto and their successors 
hereunder and the Holders, any benefit or any legal or equitable right, 
remedy or claim under this Indenture.

          SECTION 1.12.   GOVERNING LAW.

          This Indenture and the Securities shall be governed by and 
construed in accordance with the laws (other than the choice of law 
provisions) of the State of Wisconsin.

          SECTION 1.13.   LEGAL HOLIDAYS.

          In any case where any Interest Payment Date, Redemption Date or 
Stated Maturity of any Security shall not be a Business Day at any Place of 
Payment, then (notwithstanding any other provision of this Indenture or of 
the Securities) payment of interest or principal (and premium, if any) need 
not be made at such Place of Payment on such date, but may be made on the 
next succeeding Business Day or on such other day as may be set out in the 
Officer's Certificate pursuant to Section 3.01 at such Place of Payment with 
the same force and effect as if made on the Interest Payment Date or 
Redemption Date, or at the Stated Maturity, provided that no interest shall 
accrue for the period from and after such Interest Payment Date, Redemption 
Date or Stated Maturity, as the case may be.

          SECTION 1.14.   NO RECOURSE AGAINST OTHERS.

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

                                     -15-
<PAGE>





                                     -16-
<PAGE>
                                       
                                   ARTICLE II

                                 SECURITY FORMS

SECTION 2.01.     FORMS GENERALLY.

          The Securities of each series shall be in substantially the form 
set forth in this Article, or in such other form as shall be established by 
or pursuant to a Board Resolution or in one or more indentures supplemental 
hereto, in each case with such appropriate insertions, omissions, 
substitutions and other variations as are required or permitted by this 
Indenture, and may have such letters, numbers or other marks of 
identification and such legends or endorsements placed thereon as may be 
required to comply with the rules of any securities exchange or as may, 
consistently herewith, be determined by the Officers executing such 
Securities, as evidenced by their execution of the Securities.  If the form 
of Securities of any series is established by action taken pursuant to a 
Board Resolution, a copy of an appropriate record of such action shall be 
certified by the Secretary or an Assistant Secretary of the Company and 
delivered to the Trustee at or prior to the delivery of the Company Order 
contemplated by Section 3.03 for the authentication and delivery of such 
Securities.

          The Trustee's certificates of authentication shall be in 
substantially the form set forth in this Article.

          The definitive Securities shall be photocopied, printed, 
lithographed or engraved on steel engraved borders or may be produced in any 
other manner, all as determined by the Officers executing such Securities, as 
evidenced by their execution of such Securities.

          SECTION 2.02.   FORM OF FACE OF SECURITY.

          [If the Security is an Original Issue Discount Security, insert--FOR
PURPOSES OF SECTION 1272 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE
"CODE"), THE AMOUNT OF ORIGINAL ISSUE DISCOUNT (AS DEFINED IN SECTION 1273(a)(1)
OF THE CODE AND TREASURY REGULATION SECTION 1.1273-1(a) WITH RESPECT TO THIS
SECURITY IS _______, THE ISSUE PRICE (AS DEFINED IN TREASURY REGULATION SECTION
1.1273-2) OF THIS SECURITY IS __________, THE ISSUE DATE (AS DEFINED IN SECTION
1275(a)(2) OF THE CODE AND TREASURY REGULATION SECTION 1.1273-2) OF THIS
SECURITY IS _______ AND THE YIELD TO MATURITY OF THIS SECURITY IS ___________.]

                                     -17-
<PAGE>

                                       
                       WISCONSIN PUBLIC SERVICE CORPORATION

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

No. _________                                                   [$] _________

          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 ____________, or 
registered assigns, the principal sum of ___________ Dollars on 
___________________ [If the Security is to bear interest prior to Maturity, 
insert--, and to pay interest thereon from _______________ or from the most 
recent Interest Payment Date to which interest has been paid or duly provided 
for, [semi-annually] [quarterly] [monthly] [on _______ and ________] in each 
year, commencing ______________, at the rate of _____% per annum, until the 
principal hereof is paid or made available for payment [If applicable insert--, 
and (to the extent that the payment of such interest shall be legally 
enforceable) at the rate of _____% 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 
_____ of _____ (whether or not a Business Day), as the case may be, next 
preceding such Interest Payment Date. 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].

          [If the Security is not to bear interest prior to Maturity, 
insert--The principal of this Security shall not bear interest except in the 
case of a default in payment of principal upon acceleration, upon redemption 
or at Stated Maturity and in such case the overdue principal of this Security 
shall bear interest at the rate of ____% per annum (to the extent that the 
payment of such interest shall be legally enforceable), which shall accrue 
from the date of such default in payment to the date payment of such 
principal has been made or duly provided for.  Interest on any overdue 
principal shall be payable on demand. Any such interest on any overdue 
principal that is not so paid on demand shall bear interest at the rate of 
___% per annum (to the extent that the payment of such interest shall be 
legally enforceable), which shall accrue from the date of such demand for 
payment to the date payment of such interest has been made or duly provided 
for, and such interest shall also be payable on demand.]

          Payment of the principal of (and premium, if any) and 
[if applicable, insert--any such] interest on this Security will be made at 
the office or agency of the Company maintained 

                                     -18-
<PAGE>

for that purpose in ______, in Dollars [if applicable, insert--; provided, 
however, that at the option of the Company payment of interest may be made 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 (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 (now known as Firstar Bank Milwaukee, N.A.), 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 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 
SERIES OF SECURITIES INITIALLY ISSUED CONTEMPORANEOUSLY WITH SUCH COLLATERAL 
BONDS.

          [Include the following paragraph if the Company elects to issue
Substituted Collateral Bonds (as defined in the Indenture):  The Securities will
be secured by First Mortgage Bonds (the "Collateral Bonds") delivered by the
Company to the Trustee for the benefit of the Holders of the Securities, issued
under [the Substituted Mortgage Indenture (as defined in the Indenture)] from
the Company to ________________, as trustee (the "Mortgage Trustee").  Reference
is made to the Substituted Mortgage Indenture and the Indenture for a
description of the rights of the Trustee as holder of the Substituted Collateral
Bonds, the property mortgaged and pledged under the Substituted Mortgage
Indenture, the rights of the Company and of the Mortgage Trustee in respect
thereof, the duties and immunities of the Mortgage Trustee, the terms and
conditions upon which the Substituted Collateral Bonds are secured and the
circumstances under which additional Substituted Collateral Bonds may be
issued.]

                                     -19-
<PAGE>


          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]

     SECTION 2.03.        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 $_________].

          [If applicable, insert -- The Securities of this series are subject to
redemption upon not less than 30 nor more than 45 days' notice by first class
mail, [if applicable, insert--(l) on ______ in any year commencing with the year
______ and ending with the year _____ through operation of the sinking fund for
this series at a Redemption Price equal to 100% of the principal amount, and
(2)] at any time [on or after _______, _______], as a whole or in part, at the
election of the Company, at the following Redemption Prices (expressed as
percentages of the principal amount):

          If redeemed [on or before ______________, ____%, and if redeemed]
during the 12-month period beginning ____________________ of the years 
indicated,

                                     -20-
<PAGE>

<TABLE>
<CAPTION>
                   Redemption                                Redemption
Year                 Price             Year                    Price
- ----                 -----             ----                    -----
<S>                <C>                 <C>                   <C>

</TABLE>

and thereafter at a Redemption Price equal to ____% of the principal amount, 
together in the case of any such redemption [(if applicable, insert -- (whether 
through operation of the sinking fund or otherwise)] with accrued and unpaid 
interest to the Redemption Date, but interest installments whose Stated 
Maturity is on or prior to such Redemption Date will be payable to the 
Holders of such Securities, or one or more Predecessor Securities, of record 
at the close of business on the relevant Record Dates referred to on the face 
hereof, all as provided in the Indenture.]

          [If applicable, insert -- The Securities of this series are subject to
redemption upon not less than 30 nor more than 45 days' notice by first class
mail, (1) on ____________ in any year commencing with the year ____ and ending
with the year ____ through operation of the sinking fund for this series at the
Redemption Prices for redemption through operation of the sinking fund
(expressed as percentages of the principal amount) set forth in the table below,
and (2) at any time [on or after ____________], as a whole or in part, at the
election of the Company, at the Redemption Prices for redemption otherwise than
through operation of the sinking fund (expressed as percentages of the principal
amount) set forth in the table below:

          If redeemed during a 12-month period beginning ________________ of 
the years indicated,

<TABLE>
<CAPTION>
                                                          Redemption Price for
                                  Redemption Price        Redemption Otherwise
                                   For Redemption             Than Through
                                 Through Operation             Operation
                                       of the                 of the Sinking
           Year                     Sinking Fund                Fund
           ----                  -----------------        ---------------------
<S>                              <C>                      <C>

</TABLE>

and thereafter at a Redemption Price equal to ___% of the principal amount, 
together in the case of any such redemption (whether through operation of the 
sinking fund or otherwise) with accrued and unpaid interest to the Redemption 
Date, but interest installments whose Stated Maturity is on or prior to such 
Redemption Date will be payable to the Holders of such Securities, or one or 
more Predecessor Securities, of record at the close of business on the 
relevant Record Dates referred to on the face hereof, all as provided in the 
Indenture.]

                                      -21-
<PAGE>

          [Notwithstanding the foregoing, the Company may not, prior to 
________, redeem any Securities of this series as contemplated by [clause (2) 
of] the preceding paragraph as a part of, or in anticipation of, any 
refunding operation by the application, directly or indirectly, of moneys 
borrowed having an interest cost to the Company (calculated in accordance 
with generally accepted financial practice) of less than __% per annum.]

          [The sinking fund for this series provides for the redemption on
_______ in each year beginning with the year _____ and ending with the year
______ of [not less than] $__________ [("mandatory sinking fund") and not more
than $____________] aggregate principal amount of Securities of this series.]
[Securities of this series acquired or redeemed by the Company otherwise than
through [mandatory] sinking fund payments may be credited against subsequent
[mandatory] sinking fund payments otherwise required to be made--in the
[inverse] order in which they become due.]

          [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.]

          [If the Security is not an Original Issue Discount Security, insert --
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.]  [If the Security is an Original Issue Discount Security, insert --
If an Event of Default with respect to Securities of this series shall occur and
be continuing, an amount of principal of the Securities of this series may be
declared due and payable in the manner and with the effect provided in the
Indenture.  Such amount shall be equal--insert formula for determining the
amount.] 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 compliance by
the Company with certain provisions of the Indenture and 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 

                                      -22-
<PAGE>

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 $_______ 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.

          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 [If other covenants are applicable pursuant to the provisions of 
Section 3.01, insert here].  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.


                                      -23-
<PAGE>

          [If applicable, insert -- 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.

                                      -24-
<PAGE>

                                       
                                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:
       ---------------------------------------

                                      -25-
<PAGE>

          SECTION 2.04.   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

          SECTION 2.05.   SECURITIES ISSUABLE IN THE FORM OF A GLOBAL SECURITY.

          (a)     If the Company shall establish pursuant to Section 3.01 
hereof that the Securities of a particular series are to be issued in whole 
or in part in the form of one or more Global Securities, then the Company 
shall execute and the Trustee shall, in accordance with Section 3.03 hereof 
and the Company Order delivered to the Trustee hereunder, authenticate and 
deliver such Global Security or Securities, which (i) represent, shall be 
denominated in an amount equal to the aggregate principal amount of, and 
shall have the same terms as, the outstanding Securities of such series to be 
represented by such Global Security or Securities, (ii) shall be registered 
in the name of the Depositary or its nominee, (iii) shall be delivered by the 
Trustee to the Depositary or pursuant to the Depositary's instruction and 
(iv) shall bear a legend substantially to the following effect:  "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 Global Security is presented by an authorized 
representative of The Depository Trust Company (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 such 
other name as requested by an authorized representative of The Depository 
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 since 
the registered owner hereof, Cede & Co., has an interest herein" or such 
other legend as may be required by the rules and regulations of the 
Depositary.

          (b)     Notwithstanding any other provision of Section 3.05 hereof or
of this Section 2.05, unless the terms of a Global Security expressly permit
such Global Security to be 

                                      -26-
<PAGE>

exchanged in whole or in part for individual Securities, a Global Security 
may be transferred, in whole but not in part, only as described in the legend 
thereto.

          (c)     (i)     If at any time the Depositary for a Global Security 
notifies the Company that it is unwilling or unable to continue as Depositary 
for such Global Security or if at any time the Depositary for the Global 
Security shall no longer be eligible or in good standing under the Exchange 
Act or other applicable statute or regulation, the Company shall appoint a 
successor Depositary with respect to such Global Security.  If a successor 
Depositary for such Global Security is not appointed by the Company within 90 
days after the Company receives such notice or becomes aware of such 
ineligibility, the Company's election pursuant to Section 3.01(3) hereof 
shall no longer be effective with respect to the series of Securities 
evidenced by such Global Security and the Company shall execute, and the 
Trustee, upon receipt of a Company Order for the authentication and delivery 
of individual Securities of such series in exchange for such Global Security, 
shall authenticate and deliver, individual Securities of such series of like 
tenor and terms in definitive form in an aggregate principal amount equal to 
the principal amount of the Global Security in exchange for such Global 
Security.  The Trustee shall not be charged with knowledge or notice of the 
ineligibility of a Depositary unless a responsible officer assigned to and 
working in its corporate trustee administration department shall have actual 
knowledge thereof.

          (ii)    The Company may at any time and in its sole discretion 
determine that all Outstanding (but not less than all) Securities of a series 
issued or issuable in the form of one or more Global Securities shall no 
longer be represented by such Global Security or Securities.  In such event 
the Company shall execute, and the Trustee, upon receipt of a Company Order 
for the authentication and delivery of individual Securities in exchange for 
such Global Security, shall authenticate and deliver individual Securities of 
like tenor and terms in definitive form in an aggregate principal amount 
equal to the principal amount of such Global Security or Securities in 
exchange for such Global Security or Securities.

          (iii)   In any exchange provided for in any of the preceding two 
paragraphs, the Company will execute and the Trustee will authenticate and 
deliver individual Securities in definitive registered form in authorized 
denominations.  Upon the exchange of a Global Security for individual 
Securities, such Global Security shall be cancelled by the Trustee.  
Securities issued in exchange for a Global Security pursuant to this Section 
shall be registered in such names and in such authorized denominations as the 
Depositary for such Global Security, pursuant to instructions from its direct 
or indirect participants or otherwise, shall instruct the Trustee.  The 
Trustee shall deliver such Securities to the Depositary for delivery to the 
persons in whose names such Securities are so registered, or if the 
Depositary shall refuse or be unable to deliver such Securities, the Trustee 
shall deliver such Securities to the persons in whose names such Securities 
are registered, unless otherwise agreed upon between the Trustee and the 
Company, in which event the Company shall cause the Securities to be 
delivered to the persons in whose names such Securities are registered.

          (d)     Neither the Company, the Trustee, any Authenticating Agent nor
any paying agent shall have any responsibility or liability for any aspect of
the records relating to, or 

                                      -27-
<PAGE>

payments made on account of, beneficial ownership interests of a Global 
Security or for maintaining, supervising or reviewing any records relating to 
such beneficial ownership interest.

          (e)     Pursuant to the provisions of this subsection, at the 
option of the Trustee and upon 30 days' written notice to the Depositary but 
not prior to the first Interest Payment Date of the respective Global 
Securities of the same series, the Depositary shall be required to surrender 
any two or more Global Securities of the same series which have identical 
terms, including, without limitation, identical maturities, interest rates 
and redemption provisions to the Trustee, and the Company shall execute and 
the Trustee shall authenticate and deliver to, or at the direction of, the 
Depositary a Global Security of the same series in principal amount equal to 
the aggregate principal amount of, and with all terms identical to, the 
Global Securities surrendered thereto.  The exchange contemplated in this 
subsection shall be consummated at least 30 days prior to any Interest 
Payment date applicable to any of the Global Securities surrendered to the 
Trustee.  Upon any exchange of any Global Security, whether pursuant to this 
Section or pursuant to Section 3.05 or Section 12.07 hereof, the aggregate 
principal amount of the Securities or a series shall be the same before and 
after such exchange, after giving effect to any retirement of Securities of 
such series.

          SECTION 2.06.   CUSIP NUMBER.

          The Company in issuing Securities of any series may use a "CUSIP" 
number, and, if so, the Trustee may use the CUSIP number in notices of 
redemption or exchange as a convenience to Holders of such series; provided, 
that any such notice may state that no representation is made as to the 
correctness or accuracy of the CUSIP number printed on the notice or on the 
Securities of such series, and that reliance may be placed only on the other 
identification numbers printed on the Securities, and any such redemption 
shall not be affected by any defect in or omission of such numbers.  The 
Company will promptly notify the Trustee of any change in the CUSIP number of 
any series of Securities.

          SECTION 2.07.   PAYMENT OF SECURITIES.

          Payment of the principal, interest and premium on all Securities 
shall be payable as follows:

          (a)     On or before 9:30 a.m., New York City time, or such other 
time as shall be agreed upon between the Trustee and the Company, of the day 
on which payment of principal, interest and premium is due on any Global 
Security pursuant to the terms thereof, the Company shall deliver to the 
Trustee funds available on such date sufficient to make such payment, by wire 
transfer of immediately available funds or by instructing the Trustee to 
withdraw sufficient funds from an account maintained by the Company with the 
Trustee or such other method as is acceptable to the Trustee.  On or 
before 10:00 a.m., New York City time, or such other time as shall be agreed 
upon between the Trustee and the Depositary, of the day on which any payment 
of interest is due on any Global Security (other than at maturity), the 
Trustee shall pay to the Depositary such interest in same day funds.  On or 

                                      -28-
<PAGE>


before 10:00 a.m., New York City time or such other time as shall be agreed 
upon between the Trustee and the Depositary, of the day on which principal, 
interest payable at maturity and premium, if any, is due on any Global 
Security, the Trustee shall deposit with the Depositary the amount equal to 
the principal, interest payable at maturity and premium, if any, by wire 
transfer into the account specified by the Depositary.  As a condition to the 
payment, at maturity or upon redemption, of any part of the principal or 
interest on and applicable premium of any Global Security, the Depositary 
shall surrender, or cause to be surrendered, such Global Security to the 
Trustee, whereupon a new Global Security shall be issued to the Depositary 
pursuant to Section 3.05 hereof.

          (b)     With respect to any Security that is not a Global Security, 
principal, applicable premium and interest due at the maturity of the 
Security shall be payable in immediately available funds when due upon 
presentation and surrender of such Security at the corporate trust office of 
the Trustee or at the authorized office of any paying agent.  Interest on any 
Security that is not a Global Security (other than interest payable at 
maturity) shall be paid by check mailed to the Holder thereof at such 
Holder's address as it appears on the register by check payable in 
clearinghouse funds; PROVIDED that if the Trustee receives a written request 
from any Holder of Securities, the aggregate principal amount of which having 
the same Interest Payment Date equals or exceeds $10,000,000, on or before 
the applicable Regular Record Date for such Interest Payment Date, interest 
shall be paid by wire transfer of immediately available funds to a bank 
within the continental United States designated by such Holder in its request 
or by direct deposit into the account of such Holder designated by such 
Holder in its request if such account is maintained with the Trustee or any 
paying agent.

          (c)     The Trustee shall receive the Collateral Bonds or 
Substituted Collateral Bonds from the Company as provided in this Indenture 
and shall hold the Collateral Bonds or Substituted Collateral Bonds, and any 
and all sums payable thereon or with respect thereto or realized therefrom, 
in trust for the benefit of the holders of the Securities, as herein 
provided.  All payments made by or on behalf of the Company to the Trustee on 
a series of Collateral Bonds or Substituted Collateral Bonds shall be deemed 
to be a payment by the Company pursuant to this Section 2.07 and shall be 
applied by the Trustee to pay, when due, principal of, premium, if any, 
and/or interest on the Related Series of Securities and, to the extent so 
applied, shall satisfy the Company's obligations on such Securities.  The 
Company shall cause payment to be made to the Trustee of principal of, 
premium, if any, and (if applicable) interest on a series of Collateral Bonds 
in a manner and at a time that will enable the Trustee to make payments when 
due, of the principal of, premium, if any, and interest on the Related Series 
of Securities.

                                      -29-
<PAGE>
                                       
                                  ARTICLE III

                                THE SECURITIES

          SECTION 3.01.   AMOUNT UNLIMITED; ISSUABLE IN SERIES.

          The aggregate principal amount of Securities which may be 
authenticated and delivered under this Indenture is unlimited.

          The Securities may be issued from time to time in one or more 
series. There shall be established in or pursuant to a Board Resolution, and 
set forth in an Officer's Certificate, or established in one or more 
indentures supplemental hereto, prior to the issuance of Securities of any 
series:

          (1) the title of the Securities of the series (which shall 
     distinguish the Securities of the series from all other Securities);

          (2) any limit upon the aggregate principal amount of the Securities 
     of the series which may be authenticated and delivered under this 
     Indenture (except for Securities authenticated and delivered upon 
     registration of transfer of, or in exchange for, or in lieu of, other 
     Securities of the series pursuant to Sections 3.04, 3.05, 3.06, 10.06 or 
     12.07);

          (3) whether any Securities of the series are to be issuable in 
     permanent global form with or without coupons and, if so, (i) whether 
     beneficial owners of interests in any such permanent global Security may 
     exchange such interests for Securities of such series and of like tenor 
     of any authorized form and denomination and the circumstances under 
     which any such exchanges may occur, if other than in the manner provided 
     in Sections 2.05 and 3.05, and (ii) the name of the Depositary with 
     respect to any global Security;

          (4) the date or dates on which the principal of the Securities of 
     the series is payable;

          (5) the rate or rates at which the Securities of the series shall 
     bear interest, if any, the date or dates from which such interest shall 
     accrue, the Interest Payment Dates on which such interest shall be 
     payable and the Regular Record Date for the interest payable on any 
     Interest Payment Date and, if applicable to such series of Securities, 
     the basis points and United States Treasury rate(s) and any other rates 
     to be used in calculating the reset rate;

          (6) the place or places where the principal of (and premium, if 
     any) and interest on Securities of the series shall be payable;

                                     -30-
<PAGE>

          (7) the period or periods within which, the price or prices at 
     which and the terms and conditions upon which Securities of the series 
     may be redeemed, in whole or in part, at the option of the Company, 
     pursuant to any sinking fund or otherwise;

          (8) the obligation, if any, of the Company to redeem or purchase 
     Securities of the series pursuant to any sinking fund or analogous 
     provisions or at the option of a Holder thereof and the period or 
     periods within which, the price or prices at which and the terms and 
     conditions upon which Securities of the series shall be redeemed or 
     purchased, in whole or in part, pursuant to such obligation, and, where 
     applicable, the obligation of the Company to select the Securities to be 
     redeemed;

          (9) the denominations in which Securities of the series shall be 
     issuable;

         (10) if other than the principal amount thereof, the portion of the 
     principal amount of Securities of the series which shall be payable upon 
     declaration of acceleration of the Maturity thereof pursuant to Section 
     6.02;

         (11) additional Events of Default with respect to Securities of the 
     series, if any, other than those set forth herein;

         (12) if either or both of Section 14.02 and Section 14.03 shall be 
     inapplicable to the Securities of the series (provided that if no such 
     inapplicability shall be specified, then both Section 14.02 and Section 
     14.03 shall be applicable to the Securities of the series);

         (13) if other than U.S. dollars, the currency or currencies or units 
     based on or related to currencies in which the Securities of such series 
     shall be denominated and in which payments or principal of, and any 
     premium and interest on, such Securities shall or may by payable;

         (14) additional covenants with respect to Securities of the series, 
     if any, other than those set forth herein;

         (15) if prior to the Release Date, the designation of the Related 
     Series of Collateral Bonds being delivered to the Trustee in connection 
     with the issuance of such Securities,

         (16) if on or after the Release Date, the designation of the Related 
     Series of Substituted Collateral Bonds, if any,

         (17) if other than the Trustee, the identity of the Registrar and 
     any Paying Agent; and

         (18) any other terms of the series (which terms shall not be 
     inconsistent with the provisions of this Indenture).

                                      -31-
<PAGE>


          All Securities of any one series shall be substantially identical 
except as to denomination and except as may otherwise be provided in or 
pursuant to such Board Resolution and set forth in such Officer's Certificate 
or in any such Indenture supplemental hereto.

          If any of the terms of the series are established by action taken 
pursuant to a Board Resolution, a copy of an appropriate record of such 
action shall be certified by the Secretary or an Assistant Secretary of the 
Company and delivered to the Trustee at or prior to the delivery of the 
Officer's Certificate setting forth, or providing the manner for determining, 
the terms of the Securities of such series.

          SECTION 3.02.   DENOMINATIONS.

          The Securities of each series shall be issuable in registered form 
without coupons in such denominations as shall be specified as contemplated 
by Section 3.01.  In the absence of any such provisions with respect to the 
Securities of any series, the Securities of such series shall be issuable in 
denominations of $1,000 and any integral multiple thereof.

          SECTION 3.03.   EXECUTION, AUTHENTICATION, DELIVERY AND DATING.

          The Securities shall be executed on behalf of the Company by its 
Chairman of the Board, its Vice Chairman of the Board, its President or one 
of its Vice Presidents, under its corporate seal reproduced thereon attested 
by its Secretary or one of its Assistant Secretaries.  The signature of any 
of these officers on the Securities may be manual or facsimile.  The seal of 
the Company may be in the form of a facsimile thereof and may be impressed, 
affixed, imprinted or otherwise reproduced on the Securities.  Typographical 
and other minor errors or defects in any such reproduction of the seal or any 
such signature shall not affect the validity or enforceability of any 
Security that has been duly authenticated and delivered by the Trustee.

          Securities bearing the manual or facsimile signatures of 
individuals who were at any time the proper officers of the Company shall 
bind the Company, notwithstanding that such individuals or any of them have 
ceased to hold such offices prior to the authentication and delivery of such 
Securities or did not hold such offices at the date of such Securities.

          At any time and from time to time after the execution and delivery 
of this Indenture, the Company may deliver Securities of any series executed 
by the Company to the Trustee for authentication, together with a Company 
Order for the authentication and delivery of such Securities, and the Trustee 
in accordance with the Company Order shall authenticate and make such 
Securities available for delivery.  If the form or terms of the Securities of 
the series have been established in or pursuant to one or more Board 
Resolutions as permitted by Sections 2.01 and 3.01, in authenticating such 
Securities, and accepting the additional responsibilities under this 
Indenture in relation to such Securities, the Trustee shall be entitled to 
receive, and (subject to Sections 315(a) through (d) of the Trust Indenture 
Act) shall be fully protected in relying upon, an Opinion of Counsel stating,

                                      -32-
<PAGE>

          (a)     if the form of such Securities has been established by or 
pursuant to Board Resolution as permitted by Section 2.01, that such form has 
been established in conformity with the provisions of this Indenture;

          (b)     if the terms of such Securities have been established by or 
pursuant to Board Resolution as permitted by Section 3.01, that such terms 
have been established in conformity with the provisions of this Indenture;

          (c)     that such Securities, when authenticated and delivered by 
the Trustee and issued by the Company in the manner and subject to any 
conditions specified in such Opinion of Counsel, will constitute valid and 
legally binding obligations of the Company, enforceable in accordance with 
their terms, except to the extent enforceability may be limited by applicable 
bankruptcy, insolvency, reorganization, moratorium and other similar laws 
affecting the enforcement of creditors' rights generally and by the effect of 
general principles of equity (regardless of whether enforceability is 
considered in a proceeding in equity or at law);

          (d)     if prior to the Release Date, that the Related Series of 
Collateral Bonds being delivered to the Trustee in connection with the 
issuance of such Securities when authenticated and delivered by the Mortgage 
Trustee and issued by the Company in the manner and subject to any conditions 
specified in such Opinion of Counsel, will constitute valid and binding 
obligations of the Company, enforceable in accordance with their terms, 
except to the extent enforcement may be limited by applicable bankruptcy, 
insolvency, reorganization, moratorium and other similar laws affecting the 
enforcement of creditors' rights generally and by the effect of general 
principles of equity (regardless of whether enforceability is considered in a 
proceeding in equity or at law) and except as enforcement of provisions 
thereof may be limited by state laws affecting the remedies for the 
enforcement of the security provided for in the First Mortgage Indenture; and 
that such Collateral Bonds are entitled to the benefit of the First Mortgage 
Indenture, equally and ratably, with all other First Mortgage Bonds (if any) 
outstanding under the First Mortgage Indenture, except as to sinking fund 
provisions;

          (e)     if any Substituted Collateral Bonds are to be delivered, 
that the Related Series of Substituted Collateral Bonds being delivered to 
the Trustee in connection with the issuance of such Securities when 
authenticated and delivered by the trustee under the Substituted Mortgage 
Indenture and issued by the Company in the manner and subject to any 
conditions specified in such Opinion of Counsel, will constitute valid and 
binding obligations of the Company, enforceable in accordance with their 
terms, except to the extent enforcement may be limited by applicable 
bankruptcy, insolvency, reorganization, moratorium and other similar laws 
affecting the enforcement of creditors' rights generally and by the effect of 
general principles of equity (regardless of whether enforceability is 
considered in a proceeding in equity or at law) and except as enforcement of 
provisions thereof may be limited by state laws affecting the remedies for 
the enforcement of the security provided for in the Substituted Mortgage 
Indenture; and that such Substituted Collateral Bonds are entitled to the 
benefit of the Substituted Mortgage Indenture, equally and ratably, with all 
other First Mortgage Bonds (if any) outstanding under the Substituted First 
Mortgage Indenture, except as to sinking fund provisions;

                                      -33-
<PAGE>

          (f)     that no consent, approval, authorization, order, 
registration or qualification of or with any court or any governmental agency 
or body having jurisdiction over the Company is required for the execution 
and delivery of such Securities by the Company, except such as have been 
obtained (except that no opinion need be expressed as to state securities or 
Blue Sky laws).

If such form or terms have been so established, the Trustee shall not be 
required to authenticate such Securities if the issue of such Securities 
pursuant to this Indenture will affect the Trustee's own rights, duties or 
immunities under the Securities and this Indenture or otherwise in a manner 
which is not reasonably acceptable to the Trustee, or in the written opinion 
of counsel to the Trustee (which counsel may be an employee of the Trustee) 
such authentication may not lawfully be made or would involve the Trustee in 
personal liability.

          Notwithstanding the provisions of Section 3.01 and of the 
immediately preceding paragraph, if all Securities of a series are not to be 
originally issued at one time, it shall not be necessary to deliver the 
Officer's Certificate otherwise required pursuant to Section 3.01 or the 
Company Order and Opinion of Counsel otherwise required pursuant to the 
immediately preceding paragraph at or prior to the time of authentication of 
each Security of such series if such documents are delivered at or prior to 
the authentication upon original issuance of the first Security of such 
series to be issued.

          If the Company shall establish pursuant to Section 3.01 that the 
Securities of a series are to be issued in the form of one or more global 
Securities, then the Company shall execute and the Trustee shall, in 
accordance with this section and the Company Order with respect to the 
authentication and delivery of such series, authenticate and deliver one or 
more global Securities that (i) shall be in an aggregate amount equal to the 
aggregate principal amount specified in such Company Order, (ii) shall be 
registered in the name of the Depositary therefor or its nominee, and (iii) 
shall be made available for delivery by the Trustee to the Depositary or 
pursuant to the Depositary's instruction.

          Each depositary designated pursuant to Section 3.01 must, at the 
time of its designation and at all times while it serves as depositary, be a 
clearing agency registered under the Exchange Act and any other applicable 
statute or regulation.

          Unless otherwise provided for in the form of Security, each 
Security shall be dated the date of its authentication.

          No Security shall be entitled to any benefit under this Indenture 
or be valid or obligatory for any purpose unless there appears on such 
Security a certificate of authentication substantially in the form provided 
for herein executed by the Trustee by manual signature, and such certificate 
upon any Security shall be conclusive evidence, and the only evidence, that 
such Security has been duly authenticated and delivered hereunder and is 
entitled to the benefits of this Indenture.

                                      -34-
<PAGE>

          SECTION 3.04.   TEMPORARY SECURITIES.

          Pending the preparation of definitive Securities of any series, the 
Company may execute, and upon Company Order the Trustee shall authenticate 
and make available for delivery, temporary Securities which are printed, 
lithographed, typewritten, mimeographed or otherwise produced, in any 
authorized denomination, substantially of the tenor of the definitive 
Securities in lieu of which they are issued and with such appropriate 
insertions, omissions, substitutions and other variations as the officers 
executing such Securities may determine, as evidenced by their execution of 
such Securities.

          In the case of Securities of any series, such temporary Securities 
may be in global form, representing all or a portion of the Outstanding 
Securities of such series.

          Except in the case of temporary Securities in global form (which 
shall be exchanged in accordance with the provisions of Section 3.05), if 
temporary Securities of any series are issued, the Company will cause 
definitive Securities of that series to be prepared without unreasonable 
delay.  After the preparation of definitive Securities of such series, the 
temporary Securities of such series shall be exchangeable for definitive 
Securities of such series upon surrender of the temporary Securities of such 
series at the office or agency of the Company in a Place of Payment for that 
series, without charge to the Holder. Upon surrender for cancellation of any 
one or more temporary Securities of any series, the Company shall execute and 
the Trustee shall authenticate and make available for delivery in exchange 
therefor a like principal amount of definitive Securities of the same series 
of authorized denominations and of like tenor.  Until so exchanged, the 
temporary Securities of any series shall in all respects be entitled to the 
same benefits under this Indenture as definitive Securities of such series.

          If temporary Securities of any series are issued in global form, 
any such temporary global Security shall, unless otherwise provided therein, 
be delivered to the office of the Depositary therefor for credit to the 
respective accounts of the beneficial owners of such Securities (or to such 
other accounts as they may direct).

          SECTION 3.05.   REGISTRATION, REGISTRATION OF TRANSFER AND EXCHANGE.

          The Company shall cause to be kept at the Corporate Trust Office of 
the Trustee a register (the register maintained in such office and in any 
other office or agency of the Company in a Place of Payment being herein 
sometimes collectively referred to as the "SECURITY REGISTER") in which, 
subject to such reasonable regulations as it may prescribe, the Company shall 
provide for the registration of Securities and of registration of transfers 
of Securities.  The Trustee is hereby appointed "SECURITY REGISTRAR" for the 
purpose of registering Securities and transfers of Securities as herein 
provided.

          Upon surrender for registration of transfer of any Security of any
series at the office or agency of the Company in Place of Payment for that
series, the Company shall execute, and the Trustee shall authenticate and make
available for delivery, in the name of the 

                                      -35-
<PAGE>

designated transferee or transferees, one or more new Securities of the same 
series, of any authorized denominations and of a like aggregate principal 
amount and Stated Maturity.

          At the option of the Holder, Securities of any series may be 
exchanged for other Securities of the same series, of any authorized 
denominations and of a like aggregate principal amount and Stated Maturity, 
upon surrender of the Securities to be exchanged at such office or agency.  
Whenever any Securities are so surrendered for exchange, the Company shall 
execute, and the Trustee shall authenticate and make available for delivery, 
the Securities which the Holder making the exchange is entitled to receive.

          If the principal amount and applicable premium, of part but not all 
of a Global Security is paid, then upon surrender to the Trustee of such 
Global Security, the Company shall execute and the Trustee shall 
authenticate, deliver and register a Global Security in an authorized 
denomination in aggregate principal amount equal to, and having the same 
terms and of the same series as, the unpaid portion of such Global Security.

          All Securities issued upon any registration of transfer or exchange 
of Securities shall be the valid obligations of the Company, evidencing the 
same debt, and entitled to the same benefits under this Indenture, as the 
Securities surrendered upon such registration of transfer or exchange.

          Every Security presented or surrendered for registration of 
transfer or for exchange shall (if so required by the Company or the Trustee) 
be duly endorsed, or be accompanied by a written instrument of transfer in 
form satisfactory to the Company and the Security Registrar duly executed, by 
the Holder thereof or his attorney duly authorized in writing.

          Unless otherwise provided in the Securities to be transferred or 
exchanged, no service charge shall be made for any registration of transfer 
or exchange of Securities, but the Company may require payment of a sum 
sufficient to cover any tax or other governmental charge that may be imposed 
in connection with any registration of transfer or exchange of Securities, 
other than exchanges pursuant to Section 3.04, 10.06 or 12.07 not involving 
any transfer.

          The Company shall not be required (i) to issue, register the 
transfer of or exchange Securities of any series during a period beginning at 
the opening of business 15 days before the day of the mailing of a notice of 
redemption of Securities of that series selected for redemption under Section 
12.03 and ending at the close of business on the day of such mailing, or (ii) 
to register the transfer of or exchange any Security so selected for 
redemption in whole or in part, except the unredeemed portion of any Security 
being redeemed in part.

          SECTION 3.06.   MUTILATED, DESTROYED, LOST AND STOLEN SECURITIES.

          If any mutilated Security is surrendered to the Trustee, the Company
shall execute and the Trustee shall authenticate and deliver in exchange
therefor a new Security of 

                                      -36-
<PAGE>

the same series and of like tenor and principal amount and bearing a number 
not contemporaneously outstanding.

          If there shall be delivered to the Company and the Trustee (i) 
evidence to their satisfaction of the destruction, loss or theft of any 
Security and (ii) such security or indemnity as may be required by them to 
save each of them and any agent of either of them harmless, then, in the 
absence of notice to the Company or the Trustee that such Security has been 
acquired by a bona fide purchaser, the Company shall execute and upon its 
request the Trustee shall authenticate and deliver, in lieu of any such 
destroyed, lost or stolen Security, a new Security of the same series and of 
like tenor and principal amount and bearing a number not contemporaneously 
outstanding.

          In case any such mutilated, destroyed, lost or stolen Security has 
become or is about to become due and payable, the Company in its discretion 
may, instead of issuing a new Security, pay such Security.

          Upon the issuance of any new Security under this Section, the 
Company may require the payment of a sum sufficient to cover any tax or other 
governmental charge that may be imposed in relation thereto and any other 
expenses (including the fees and expenses of the Trustee) connected therewith.

          Every new Security of any series issued pursuant to this Section in 
lieu of any destroyed, lost or stolen Security shall constitute an original 
additional contractual obligation of the Company, whether or not the 
destroyed, lost or stolen Security shall be at any time enforceable by 
anyone, and shall be entitled to all the benefits of this Indenture equally 
and proportionately with any and all other Securities of that series duly 
issued hereunder.

          The provisions of this Section are exclusive and shall preclude (to 
the extent lawful) all other rights and remedies with respect to the 
replacement or payment of mutilated, destroyed, lost or stolen Securities.

          SECTION 3.07.   PAYMENT OF INTEREST; INTEREST RIGHTS PRESERVED.

          Interest on any Security which is payable, and is punctually paid 
or duly provided for, on any Interest Payment Date shall be paid to the 
Person in whose name that Security (or one or more Predecessor Securities) is 
registered at the close of business on the Regular Record Date for such 
interest.

          Any interest on any Security of any series which is payable, but is 
not punctually paid or duly provided for, on any Interest Payment Date 
(herein called "DEFAULTED INTEREST") shall forthwith cease to be payable to 
the Holder on the relevant Regular Record Date by virtue of having been such 
Holder, and such Defaulted Interest may be paid by the Company, at its 
election in each case, as provided in Clause (1) or (2) below:

          (1) The Company may elect to make payment of any Defaulted Interest 
     to the Persons in whose names the Securities of such series (or their 
     respective

                                      -37-
<PAGE>


     Predecessor Securities) are registered at the close of business on a 
     Special Record Date for the payment of such Defaulted Interest, which 
     shall be fixed in the following manner.  The Company shall notify the 
     Trustee in writing of the amount of Defaulted Interest proposed to be 
     paid on each Security of such series and the date of the proposed 
     payment, and at the same time the Company shall deposit with the Trustee 
     an amount of money equal to the aggregate amount proposed to be paid in 
     respect of such Defaulted Interest or shall make arrangements 
     satisfactory to the Trustee for such deposit prior to the date of the 
     proposed payment, such money when deposited to be held in trust for the 
     benefit of the Persons entitled to such Defaulted Interest as in this 
     Section 3.07 provided.  Thereupon the Trustee shall fix a Special Record 
     Date for the payment of such Defaulted Interest which shall be not more 
     than 15 days and not less than 10 days prior to the date of the proposed 
     payment and not less than 10 days after the receipt by the Trustee of 
     the notice of the proposed payment.  The Trustee shall promptly notify 
     the Company of such Special Record Date and, in the name and at the 
     expense of the Company, shall cause notice of the proposed payment of 
     such Defaulted Interest and the Special Record Date therefor to be 
     mailed, first-class postage prepaid, to each Holder of Securities of 
     such series at his address as it appears in the Security Register, not 
     less than 10 days prior to such Special Record Date.  Notice of the 
     proposed payment of such Defaulted Interest and the Special Record Date 
     therefor having been so mailed, such Defaulted Interest shall be paid to 
     the Persons in whose names the Securities of such series (or their 
     respective Predecessor Securities) are registered at the close of 
     business on such Special Record Date and shall no longer be payable 
     pursuant to the following Clause (2).

          (2) The Company may make payment of any Defaulted Interest on the 
     Securities of any series in any other lawful manner not inconsistent 
     with the requirements of any securities exchange on which such 
     Securities may be listed, and upon such notice as may be required by 
     such exchange, if, after notice given by the Company to the Trustee of 
     the proposed payment pursuant to this Section 3.07, such manner of 
     payment shall be deemed practicable by the Trustee.

          Subject to the foregoing provisions of this Section, each Security 
delivered under this Indenture upon registration of transfer of or in 
exchange for or in lieu of any other Security shall carry the rights to 
interest accrued and unpaid, and to accrue, which were carried by such other 
Security.

          SECTION 3.08.   PERSONS DEEMED OWNERS.

          Prior to due presentment of a 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 such Security is registered as the 
owner of such Security for the purpose of receiving payment of principal of 
(and premium, if any) and (subject to Section 3.07) interest on such Security 
and for all other purposes whatsoever, whether or not such Security be 
overdue, and neither the Company, the Trustee nor any agent of the Company or 
the Trustee shall be affected by notice to the contrary.

                                      -38-
<PAGE>

          None of the Company, the Trustee or any agent of the Company or the 
Trustee shall have any responsibility or liability for any aspect of the 
records relating to or payments made on account of beneficial ownership 
interest of a Security in global form, or for maintaining, supervising or 
reviewing any records relating to such beneficial ownership interest.  
Notwithstanding the foregoing, with respect to any Security in global form, 
nothing herein shall prevent the Company or the Trustee or any agent of the 
Company or the Trustee from giving effect to any written certification, proxy 
or other authorization furnished by any Depositary (or its nominee), as a 
Holder, with respect to such Security in global form or impair, as between 
such Depositary and owners of beneficial interests in such Security in global 
form, the operation of customary practices governing the exercise of the 
right of such Depositary (or its nominee) as holder of such Security in 
global form.

          SECTION 3.09.   CANCELLATION.

          All Securities surrendered for payment, redemption, registration of 
transfer or exchange or for credit against any sinking fund payment shall, if 
surrendered to any Person other than the Trustee, be delivered to the Trustee 
and shall be promptly cancelled by it.  The Company may at any time deliver 
to the Trustee for cancellation any Securities previously authenticated and 
delivered hereunder which the Company may have acquired in any manner 
whatsoever, and all Securities so delivered shall be promptly cancelled by 
the Trustee.  No Securities shall be authenticated in lieu of or in exchange 
for any Securities cancelled as provided in this Section, except as expressly 
permitted by this Indenture.  All cancelled Securities shall be held by the 
Trustee and may be destroyed (and, if so destroyed, certification of their 
destruction shall be delivered to the Company, unless, by a Company Order, 
the Company shall direct that cancelled Securities be returned to it).

          SECTION 3.10.   COMPUTATION OF INTEREST.

          Except as otherwise specified as contemplated by Section 3.01 for 
Securities of any series, interest on the Securities of each series shall be 
computed on the basis of a year of twelve 30-day months.

                                      -39-
<PAGE>
                                       
                                   ARTICLE IV

                          COLLATERAL BONDS; PLEDGED
                         SUBSTITUTED COLLATERAL BONDS

          SECTION 4.01.   DELIVERY AND ACCEPTANCE OF COLLATERAL BONDS.

          Upon the issuance of Securities hereunder at any time prior to the 
Release Date, the Company shall issue and deliver to the Trustee to hold in 
trust for the benefit of the Holders of the Securities as described in 
Section 4.08, and the Trustee shall accept therefor, a Related Series of 
Collateral Bonds registered in the name of the Trustee conforming to the 
requirements of Section 4.02.

          SECTION 4.02.   TERMS OF COLLATERAL BONDS.

          Each series of Collateral Bonds delivered to the Trustee pursuant 
to Section 4.06 shall have the same stated rate or rates of interest (or 
interest calculated in the same manner), Interest Payment Dates, stated 
maturity date and redemption provisions, and shall be in the same aggregate 
principal amount, as the series of Securities in connection with which such 
Collateral Bonds shall have been issued and delivered.

          SECTION 4.03.   COLLATERAL BONDS HELD BY THE TRUSTEE.

          The Trustee, as a Holder of Collateral Bonds, shall attend any 
meeting of Bondholders under the First Mortgage Indenture as to which it 
receives due notice, or, at its option, shall deliver its proxy in connection 
therewith. Either at such meeting, or otherwise where consent of Holders of 
First Mortgage Bonds issued under the First Mortgage Indenture is sought 
without a meeting, the Trustee shall vote all of the Collateral Bonds held by 
it, or shall consent or withhold its consent with respect thereto, as 
directed by the Holders of not less than a majority in the aggregate 
principal amount of the outstanding Securities; provided, however, that the 
Trustee shall not vote as such Holder of any particular series of Collateral 
Bonds in favor of, or give its consent to, any action which in the Trustee's 
opinion, would materially adversely affect such series of Collateral Bonds in 
a manner not shared generally by all other Collateral Bonds, except upon 
notification by the Trustee to the Holders of the Related Series of 
Securities of such proposal and consent thereto of the Holders of not less 
than a majority in aggregate principal amount of the outstanding Securities 
of such series.

          SECTION 4.04.   NO TRANSFER OF COLLATERAL BONDS; EXCEPTION.

          Except (i) as required to effect an assignment to a successor 
trustee under this Indenture, (ii) pursuant to Section 4.05 or Section 4.07 
hereof or (iii) in compliance with a final order of a court of competent 
jurisdiction in connection with any bankruptcy or reorganization proceeding 
of the Company and in compliance with the applicable provisions of Section 
184.04(2) of the Wisconsin Statutes or any successor statutory provision, the 
Trustee shall not sell, assign or transfer the Collateral Bonds, whether or 
not such sale would be in compliance with the provisions of Section 184.04(2) 
of the Wisconsin Statutes or any successor 

                                      -40-
<PAGE>

statutory provision, and the Company shall issue stop transfer instructions 
to the Mortgage Trustee and any transfer agent under the First Mortgage 
Indenture to effect compliance with this Section 4.04 and such statute.

          SECTION 4.05.   DELIVERY TO THE COMPANY OF ALL COLLATERAL BONDS.

          When the obligation of the Company to make payment with respect to 
the principal of and premium, if any, and interest on any series of 
Collateral Bonds shall cease and be discharged pursuant to Section 4.08 or 
Section 5.01, the Trustee shall, upon written request of the Company and 
receipt of the certificate of the Expert described in Section 4.10(b) hereof 
(if such certificate is then required by Section 4.10(b) hereof), deliver to 
the Company all of such Collateral Bonds, together with such appropriate 
instruments of transfer or release as may be reasonably requested by the 
Company.  All Collateral Bonds delivered to the Company in accordance with 
this Section 4.03 shall be delivered by the Company to the Mortgage Trustee 
for cancellation.

          SECTION 4.06.   FURTHER ASSURANCES.

          The Company, at its own expense, shall do such further lawful acts 
and things, and execute and deliver such additional conveyances, assignments, 
assurances, agreements and instruments, as may be necessary in order to 
better assign, assure and confirm to the Trustee its interest in the 
Collateral Bonds and for maintaining, protecting and preserving such 
interest.  The Trustee may petition any court of competent jurisdiction to 
seek any relief it considers necessary or advisable in order to maintain, 
protect and preserve such interest.

          SECTION 4.07.   EXCHANGE AND SURRENDER OF COLLATERAL BONDS.

          At any time at the written direction of the Company, the Trustee 
shall surrender to the Company all or part of the Collateral Bonds in 
exchange for Collateral Bonds equal in aggregate outstanding principal amount 
to, in different denominations than, but of the same series and with all 
other terms identical to, the Collateral Bonds so surrendered to the Company. 
In addition, at any time a Security shall cease to be entitled to any 
benefit or security under this Indenture pursuant to Section 5.01, the 
Trustee shall surrender an equal principal amount of the Related Series of 
Collateral Bonds, subject to the limitations of this Section 4.07, to the 
Company for cancellation.  The Trustee shall, together with such Collateral 
Bonds, deliver to the Company such appropriate instruments of transfer, and 
such appropriate instruments for releasing the Company of its obligations 
under such surrendered Collateral Bonds, as the Company may reasonably 
request.  Prior to the surrender required by this paragraph, the Trustee 
shall receive from the Company, and (subject to Section 7.01) shall be fully 
protected in relying upon, an Officers' Certificate stating (i) the aggregate 
outstanding principal amount of the Collateral Bonds of the issue surrendered 
by the Trustee, after giving effect to such surrender, (ii) the aggregate 
outstanding principal amount of the Related Series of Securities, (iii) that 
the surrender of the Collateral Bonds will not result in any default under 
this Indenture, and (iv) that any Collateral Bonds to be received in exchange 
for the Collateral 

                                      -41-
<PAGE>

Bonds being surrendered comply with the provisions of this Section 4.07 and 
the First Mortgage Indenture.

          The Company shall not be permitted to cause the surrender or 
exchange of all or any part of an issue of Collateral Bonds contemplated in 
this Section 4.07, if after such surrender or exchange, the aggregate 
outstanding principal amount of the Related Series of Securities would exceed 
the aggregate outstanding principal amount of such issue of Collateral Bonds 
held by the Trustee.  Any Collateral Bonds received by the Company pursuant 
to this Section 4.07 shall be delivered to the Mortgage Trustee for 
cancellation. Notwithstanding anything herein to the contrary, until the 
Release Date, the Company shall preserve and maintain the lien of this 
Indenture, and shall not permit, at anytime prior to the Release Date, the 
aggregate principal amount of Collateral Bonds held by the Trustee to be less 
than the aggregate amount of Securities Outstanding.

          SECTION 4.08.   COLLATERAL BONDS AS SECURITY FOR SECURITIES; 
APPLICATION OF PAYMENT ON COLLATERAL BONDS.

          Until the Release Date and subject to Article Five, the Related 
Series of Collateral Bonds delivered to the Trustee, in trust for the benefit 
of the Holders of the applicable issue of Securities, shall pay principal of, 
interest and premium, if any, in accordance with their respective terms and 
shall serve as security for any and all obligations of the Company under such 
Securities, including, but not limited to (1) the full and prompt payment of 
the principal of and premium, if any, on such Related Series of Securities 
when and as the same shall become due and payable in accordance with the 
terms and provisions of this Indenture or such Related Series of Securities, 
either at the stated maturity thereof, upon acceleration of the maturity 
thereof, or upon redemption (any such payment with respect to such Related 
Series of Securities to be made by the Company through payment on the Related 
Series of Collateral Bonds and applied by the Trustee to satisfy the 
Company's corresponding obligations under such Securities), and (2) the full 
and prompt payment of any interest on such Related Series of Securities when 
and as the same shall become due and payable in accordance with the terms and 
provisions of this Indenture or such Related Series of Securities.  Any 
payment by the Company of principal of, premium, if any, and interest on, a 
series of First Mortgage Bonds will be applied by the Trustee to satisfy the 
Company's obligations with respect to the principal of, premium, if any, and 
interest on, the Related Series of Securities.

          Notwithstanding anything in this Indenture to the contrary, from and
after the Release Date, the obligation of the Company to make payment with
respect to the principal of and premium, if any, and interest on the Collateral
Bonds shall cease and be discharged as provided in the supplemental trust
indenture or indentures to the First Mortgage Indenture creating such Collateral
Bonds and the Collateral Bonds shall cease to secure in any manner Securities
theretofore or subsequently issued.  From and after the Release Date, any
conditions to the issuance of Securities that refer or relate to Collateral
Bonds or the First Mortgage Indenture shall be inapplicable unless the Company
delivers Substituted Collateral Bonds to the Trustee pursuant to Section 4.09
hereof, in which event such provisions shall be deemed to refer or relate to the
Substituted Collateral Bonds.  Following the Release Date, the Company 

                                      -42-

<PAGE>

shall cause the First Mortgage Indenture to be discharged and satisfied and 
the Company shall not issue any additional First Mortgage Bonds under the 
First Mortgage Indenture.  Notice of the occurrence of the Release Date shall 
be given by the Trustee to the Holders of the Securities in the manner 
provided in Section 1.06 not later than 30 days after the Company notifies 
the Trustee of the occurrence of the Release Date.

          SECTION 4.09.   SUBSTITUTED COLLATERAL BONDS.

          (a)     The Company shall notify the Trustee not less than 90 days 
prior to the Release Date if the Company has determined to deliver to the 
Trustee on the Release Date Substituted Collateral Bonds in an aggregate 
principal amount equal to the aggregate principal amount of Securities 
outstanding on the Release Date in trust for the benefit of the Holders from 
time to time of the Securities issued under this Indenture as security for 
any and all obligations of the Company under the Securities, including but 
not limited to, (1) the full and prompt payment of the principal of and 
premium, if any, on the Securities when and as the same shall become due and 
payable in accordance with the terms and provisions of this Indenture or the 
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 the Securities when and as the same shall become due and 
payable in accordance with the terms and provisions of this Indenture or the 
Securities.

          (b)     The Substituted Collateral Bonds to be delivered pursuant 
to the notice described in Section 4.09 (a) shall be delivered in separate 
series and issues corresponding to the series and issues of Securities 
outstanding on the Release Date, each issue of Substituted Collateral Bonds 
having the same stated rate or rates of interest (or interest calculated in 
the same manner), Interest Payment Dates, stated maturity date and redemption 
provisions, and in the same aggregate principal amount, as the Related Series 
of Securities outstanding on the Release Date.

          (c)     The notice described in Section 4.09(a) shall also state 
that on the Release Date the Company shall deliver to the Trustee a 
supplemental indenture to this Indenture that will provide, among other 
things, that upon the issuance of Securities hereunder on or after the 
Release Date, the Company shall deliver to the Trustee in trust for the 
benefit of the Holders as described in Section 4.09(a), and the Trustee shall 
accept therefor, a Related Series of Substituted Collateral Bonds registered 
in the name of the Trustee and conforming to the requirements therein 
specified.

          (d)     The determination whether to issue and deliver Substituted 
Collateral Bonds shall be made in the Company's sole discretion and without 
any obligation to do so.

          (e)     In the event that the Company does not deliver the notice 
described in Section 4.09(a), the Securities outstanding on the Release Date 
shall, as of the Release Date, no longer be entitled to the benefit of the 
security of the Collateral Bonds and shall thereafter be general unsecured 
obligations of the Company.

                                      -43-
<PAGE>

          (f)     Following the delivery of Substituted Collateral Bonds to 
the Trustee pursuant to this Section 4.09, all of the provisions of this 
Indenture relating to Collateral Bonds and the First Mortgage Indenture shall 
also apply to the Substituted Collateral Bonds and the Substituted Mortgage 
Indenture, to the same extent as if the Substituted Collateral Bonds and 
Substituted Mortgage Indenture were expressly referred to therein.

          SECTION 4.10.   FAIR VALUE CERTIFICATE

          (a)     Upon the delivery by the Company to the Trustee of 
Collateral Bonds pursuant to Section 4.01 hereof, or Substituted Collateral 
Bonds pursuant to Section 4.09 hereof, the Company shall simultaneously 
therewith deliver to the Trustee a certificate of an Expert (1) stating that 
it is familiar with the provisions of such Collateral Bonds or Substituted 
Collateral Bonds and of this Indenture; (2) stating the principal amount of 
such Collateral Bonds or Substituted Collateral Bonds so delivered, the 
stated interest rate (or method of calculation of interest) of such 
Collateral Bonds or Substituted Collateral Bonds and the stated maturity date 
of such Collateral Bonds or Substituted Collateral Bonds; (3) identifying the 
Securities being issued contemporaneously therewith, and (4) stating the fair 
value to the Company of such Collateral Bonds or Substituted Collateral 
Bonds.  If the fair value to the Company of the Collateral Bonds or 
Substituted Collateral Bonds so delivered, as described in the certificate to 
be delivered pursuant to this Section 4.10(a), both (w) is equal to or 
exceeds (i) $25,000 and (ii) 1% of the principal amount of the Securities 
outstanding at the date of delivery of such Collateral Bonds or Substituted 
Collateral Bonds and (x) together with the fair value to the Company, as 
described in the certificates to be delivered pursuant to this Section 
4.10(a), of all other Collateral Bonds or Substituted Collateral Bonds 
delivered to the Trustees since the commencement of the then current calendar 
year, is equal to or exceeds 10% of the principal amount of the Securities 
Outstanding at the date of delivery of such Collateral Bonds or Substituted 
Collateral Bonds, then the certificate required by this Section 4.10 (a) 
shall (y) be delivered by an Expert who shall be independent of the Company 
and satisfactory to the Trustee in its reasonable judgement and (z) shall, in 
addition to the verifications described above, state the fair value to the 
Company of all Collateral Bonds or Substituted Collateral Bond delivered to 
the Trustee pursuant to Section 4.08 or 4.09 hereof since the commencement of 
the then current year as to which a certificate was not delivered by an 
Expert independent of the Company.

          (b)     If Collateral Bonds or Substituted Collateral Bonds are 
delivered or surrendered to the Company pursuant to Section 4.05 or 4.07 
hereof, the Company shall simultaneously therewith deliver to the Trustee a 
certificate of an Expert (1) stating that it is familiar with the provisions 
of such Collateral Bonds or Substituted Collateral Bonds and of this 
Indenture, (2) stating the principal amount of such Collateral Bonds or 
Substituted Collateral Bonds so delivered, the stated interest rate (or 
method of calculation of interest) of such Collateral Bonds or Substituted 
Collateral Bonds, (3) if applicable, identifying the Securities, the payment 
of the interest on and principal of which has been discharged hereunder, and 
(4) stating that such delivery and release will not impair the lien of this 
Indenture in contravention of the provisions of this Indenture.  If the fair 
value of the Collateral Bonds or Substituted Collateral Bonds so delivered 
and released, as described in the

                                      -44-
<PAGE>

certificate to be delivered pursuant to this Section 4.10(b), both (1) is 
equal to or exceeds (i) $25,000 and (ii) 1% of the principal amount of the 
outstanding Securities at the date of release of such Collateral Bonds or 
Substituted Collateral Bonds and (2) together with the fair value, as 
described in the certificates to be delivered pursuant to this Section 
4.10(b), of all other Collateral Bonds or Substituted Collateral Bonds 
released from the lien of this Indenture since the commencement  of the then 
current calendar year, is equal to or exceeds 10% of the principal amount of 
the Securities Outstanding at the date of release of such Collateral Bonds or 
Substituted Collateral Bonds, then the certificate required by this Section 
4.10(b) shall be delivered by an Expert who shall be independent of the 
Company.

          If, in connection with a delivery or release of outstanding 
Collateral Bonds or Substituted Collateral Bonds, the Company provides to the 
Trustee and Opinion of Counsel stating that the certificate described by this 
Section 4.10 is not required by law, such certificate shall not be required 
to be delivered hereunder in connection with such delivery or release.

                                      -45-
<PAGE>

                                       
                                   ARTICLE V

                          SATISFACTION AND DISCHARGE

          SECTION 5.01.   SATISFACTION AND DISCHARGE OF INDENTURE.

          This Indenture shall cease to be of further effect (except as to 
any surviving rights of registration of transfer or exchange of Securities 
herein expressly provided for or in the form of Security for such series), 
when the Trustee, upon Company Request and at the expense of the Company, 
shall execute proper instruments acknowledging satisfaction and discharge of 
this Indenture, when

          (a)     either

          (1)     all Securities theretofore authenticated and delivered 
(other than (A) Securities which have been destroyed, lost or stolen and 
which have been replaced or paid as provided in Section 3.06 and (B) 
Securities for whose payment money has theretofore been deposited in trust or 
segregated and held in trust by the Company and thereafter repaid to the 
Company or discharged from such trust, as provided in Section 11.08) have 
been delivered to the Trustee for cancellation; or

          (2)     all such Securities not  theretofore delivered  to the 
Trustee for  cancellation

          (A)     have become due and payable, or

          (B)     will become due and payable at their Stated Maturity within 
one year, or

          (C)     are to be called for redemption within one year under 
arrangements satisfactory to the Trustee for the giving of notice of 
redemption by the Trustee in the name, and at the expense, of the Company,

and the Company, in the case of (A), (B) or (C) above, has deposited with the 
Trustee as trust funds in trust for the purpose an amount sufficient to pay 
and discharge the entire indebtedness on such Securities not theretofore 
delivered to the Trustee for cancellation, for principal (and premium, if 
any) and interest to the date of such deposit (in the case of Securities 
which have become due and payable) or the Stated Maturity or Redemption Date, 
as the case may be;

          (b)     the Company has paid or caused to be paid all other sums
     payable hereunder by the Company; and

          (c)     the Company has delivered to the Trustee an Officer's
     Certificate and an Opinion of Counsel, each stating that all conditions
     precedent provided for herein relating to the satisfaction and discharge of
     this Indenture have been complied with.

                                      -46-
<PAGE>

          Notwithstanding the satisfaction and discharge of this Indenture, 
the obligations of the Company to the Trustee under Section 7.07, the 
obligations of the Company to any Authenticating Agent under Section 7.14 
and, if money shall have been deposited with the Trustee pursuant to 
subclause (2) of clause (a) of this Section 5.01, the obligations of the 
Trustee under Section 5.02 and the last paragraph of Section 11.08 shall 
survive.

          If the Company shall have paid or caused to be paid in whole or in 
part the principal of and premium, if any, and interest on any Security, as 
and when the same shall become due and payable or the Company shall have 
delivered to the Trustee for cancellation any outstanding Security, such 
Security shall cease to be entitled to the lien, benefit or security interest 
under this Indenture to the extent of such amounts paid.  Upon a Security of 
any series ceasing to be entitled to the lien, benefit or security under this 
Indenture, the obligation of the Company to make payment with respect to 
principal of and premium, if any, and interest on a principal amount of the 
Related Series of Collateral Bonds or Related Series of Substituted 
Collateral Bonds equal to the principal amount of such Security shall be 
satisfied and discharged and such portion of the principal amount of such 
Collateral Bonds or Substituted Collateral Bonds shall cease to secure the 
Securities in any manner.

          SECTION 5.02.   APPLICATION OF TRUST MONEY.

          Subject to the provisions of the last paragraph of Section 11.08, 
all money deposited with the Trustee pursuant to Section 5.01 shall be held 
in trust and applied by it, in accordance with the provisions of the 
Securities and this Indenture, to the payment, either directly or through any 
Paying Agent (including the Company acting as its own Paying Agent) as the 
Trustee may determine, to the Persons entitled thereto, of the principal (and 
premium, if any) and interest for whose payment such money has been deposited 
with or received by the Trustee.

                                      -47-
<PAGE>
                                       
                                   ARTICLE VI

                                    REMEDIES

          SECTION 6.01.   EVENTS OF DEFAULT.

          "EVENT OF DEFAULT," wherever used herein with respect to Securities 
of any series, means any one of the following events (whatever the reason for 
such Event of Default and whether it shall be voluntary or involuntary or to 
be effected by operation of law or pursuant to any judgment, decree or order 
of any court or any order, rule or regulation of any administrative or 
governmental body):

          (1) the Company defaults in the payment of interest on any Security 
     when such interest becomes due and payable and, if such default occurs 
     prior to the Release Date, such default continues for a period of 90 
     days or, if such default occurs on or after the Release Date, such 
     default continues for a period of 30 days; or

          (2) the Company defaults in the payment of the principal of (or 
     premium, if any, on) any Security when the same becomes due and payable 
     at Maturity, upon redemption (including redemptions under Article 
     Twelve), or otherwise; or

          (3) the Company fails to observe or perform any of its other 
     covenants, warranties or agreements in the Securities of that series or 
     this Indenture (other than a covenant, agreement or warranty a default 
     in whose performance or whose breach is elsewhere in this Section 
     specifically dealt with or which has expressly been included in this 
     Indenture solely for the benefit of series of Securities other than that 
     series), and the failure to observe or perform continues for the period 
     and after the notice specified in the last paragraph of this Section; or

          (4) prior to the Release Date, a completed default (as defined in 
     the First Mortgage Indenture under which Collateral Bonds are 
     outstanding) has occurred and is continuing; PROVIDED, HOWEVER, that 
     anything in this Indenture to the contrary notwithstanding, the waiver 
     or cure of such default under the First Mortgage Indenture and the 
     rescission and annulment of the consequences thereof under the First 
     Mortgage Indenture shall constitute a waiver of the corresponding Event 
     of Default hereunder and a rescission and annulment of the consequences 
     thereof hereunder; or

          (5) if any Substituted Collateral Bonds are outstanding, an event 
     of default or completed default (as defined in the Substituted Mortgage 
     Indenture) has occurred and is continuing; PROVIDED, HOWEVER, that 
     anything in this Indenture to the contrary notwithstanding, the waiver 
     or cure of such default under the Substituted Mortgage Indenture and the 
     rescission and annulment of the consequences thereof under the 
     Substituted Mortgage Indenture shall constitute a waiver of the 
     corresponding Event of Default hereunder and a rescission and annulment 
     of the consequences thereof hereunder; or

                                      -48-
<PAGE>


          (6) the Company pursuant to or within the meaning of any Bankruptcy 
     Law (A) commences a voluntary case or proceeding under any Bankruptcy 
     Law with respect to itself, (B) consents to the entry of a judgment, 
     decree or order for relief against it in an involuntary case or 
     proceeding under any Bankruptcy Law, (C) consents to or acquiesces in 
     the institution of bankruptcy or insolvency proceedings against it, (D) 
     applies for, consents to or acquiesces in the appointment of or taking 
     possession by a Custodian of the Company or for any material part of its 
     property, (E) makes a general assignment for the benefit of its 
     creditors or (F) takes any corporate action in furtherance of or to 
     facilitate, conditionally or otherwise, any of the foregoing; or

          (7) (i) a court of competent jurisdiction enters a judgment, decree 
     or order for relief in respect of the Company in an involuntary case or 
     proceeding under any Bankruptcy Law which shall (A) approve as properly 
     filed a petition seeking reorganization, arrangement, adjustment or 
     composition in respect of the Company, (B) appoint a Custodian of the 
     Company or for any material part of its property or (C) order the 
     winding-up or liquidation of its affairs, and such judgment, decree or 
     order shall remain unstayed and in effect for a period of 60 consecutive 
     days; or (ii) any bankruptcy or insolvency petition or application is 
     filed, or any bankruptcy or insolvency proceeding is commenced against 
     the Company and such petition, application or proceeding is not 
     dismissed within 60 days; or (iii) a warrant of attachment is issued 
     against any material portion of the property of the Company which is not 
     released within 60 days of service, or

          (8) any other Event of Default provided with respect to Securities 
     of that series.

          A Default under clause (3) above is not an Event of Default until 
the Trustee or the Holders of at least 25% in aggregate principal amount of 
the Outstanding Securities of that series notify the Company of the Default 
and the Company does not cure the Default within 90 days after receipt of the 
notice if such Default occurs prior to the Release Date or within 60 days 
after receipt of the notice if such Default occurs on or after the Release 
Date.  The notice must specify the Default, demand that it be remedied and 
state that the notice is a "Notice of Default."  When a Default under clause 
(3) above is cured within such 90-day period or 60-day period, as applicable, 
it ceases.

          SECTION 6.02.   ACCELERATION OF MATURITY AND RESCISSION.

          If an Event of Default with respect to Securities of any series (other
than an Event of Default specified in clause (6) or (7) of Section 6.01) occurs
and is continuing, the Trustee by notice in writing to the Company, or the
Holders of at least 25% in aggregate principal amount of the Outstanding
Securities of that series by notice in writing to the Company and the Trustee,
may declare the unpaid principal of and accrued interest to the date of
acceleration (or, if the Securities of that series are Original Issue Discount
Securities, such portion of the principal amount as may be specified in the
terms of that series) on all the Outstanding Securities of that series to be due
and payable immediately and, upon any such 

                                      -49-
<PAGE>


declaration, the Outstanding Securities of that series (or specified 
principal amount) shall become and be immediately due and payable.  In 
addition, the Trustee shall immediately file with the Mortgage Trustee a 
written demand for redemption of all of the Related Series of Collateral 
Bonds with respect to such series, to the extent provided in the applicable 
provisions of the First Mortgage Indenture, or, if applicable, a written 
demand for redemption of all of the Related Series of Substituted Collateral 
Bonds with respect to such series, pursuant to the applicable provisions of 
the Substituted Mortgage Indenture.

          If an Event of Default specified in clause (6) or (7) of Section 
6.01 occurs, all unpaid principal of and accrued interest on the Outstanding 
Securities of that series (or specified principal amount) shall ipso facto 
become and be immediately due and payable without any declaration or other 
act on the part of the Trustee or any Holder of any Security of that series.  
In addition, the Trustee shall immediately file with the Mortgage Trustee a 
written demand for redemption of all Collateral Bonds pursuant to the 
applicable provisions of the First Mortgage Indenture or, if applicable, a 
written demand for redemption of all Substituted Collateral Bonds pursuant to 
the applicable provisions of the Substituted Mortgage Indenture.

          Upon payment of all such principal and interest, all of the 
Company' obligations under the Securities of that series and (upon payment of 
the Securities of all series) this Indenture shall terminate, except 
obligations under Section 7.07.

          The Holders of not less than a majority in principal amount of the 
Outstanding Securities of that series by notice to the Trustee may rescind an 
acceleration and its consequences (including, if given, the written demand 
for redemption of all Collateral Bonds or, if applicable, all Substituted 
Collateral Bonds), if (i) all existing Events of Default, other than the 
nonpayment of the principal of and interest on the Securities of that series 
that has become due solely by such declaration of acceleration, have been 
cured or waived, (ii) to the extent the payment of such interest is lawful, 
interest on overdue installments of interest and overdue principal that has 
become due otherwise than by such declaration of acceleration have been paid, 
(iii) the rescission would not conflict with any judgment or decree of a 
court of competent jurisdiction and (iv) all payments due to the Trustee and 
any predecessor Trustee under Section 7.07 have been made.

          SECTION 6.03.   COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT
BY TRUSTEE.

          The Company covenants that if:

          (1) default is made in the payment of any interest on any Security 
     when such interest becomes due and payable and, (A) if such default 
     occurs prior to the Release Date, such default continues for a period of 
     90 days, or (B) if such default occurs on or after the Release Date, 
     such default continues for a period of 30 days, or

          (2) default is made in the payment of the principal of (or premium, 
     if any, on) any Security at Maturity, upon redemption (including 
     redemption under Article XII) or otherwise,

                                      -50-
<PAGE>

the Company will, upon demand of the Trustee, pay to it, for the benefit of 
the Holders of such Securities, the whole amount then due and payable on such 
Securities for principal (and premium, if any) and interest and, to the 
extent that payment of such interest shall be legally enforceable, interest 
on any overdue principal (and premium, if any) and on any overdue interest, 
at the rate or rates prescribed therefor in such Securities, and, in addition 
thereto, such further amount as shall be sufficient to cover the reasonable 
costs and expenses of collection, including the reasonable compensation, 
expenses, disbursements and advances of the Trustee, its agents and counsel.

          If the Company fails to pay such amounts forthwith upon such 
demand, the Trustee, in its own name and as trustee of an express trust, may 
institute a judicial proceeding for the collection of the sums so due and 
unpaid, may prosecute such proceeding to judgment or final decree and may 
enforce the same against the Company or any other obligor upon such 
Securities and collect the moneys adjudged or decreed to be payable in the 
manner provided by law out of the property of the Company or any other 
obligor upon such Securities, wherever situated.

          If an Event of Default hereunder occurs and is continuing, the 
Trustee may in its discretion proceed to protect and enforce its rights, 
including its rights as holder of the Collateral Bonds or the Substituted 
Collateral Bonds, and the rights of the Holders of Securities by such 
appropriate judicial proceedings as the Trustee shall deem most effectual to 
protect and enforce any such rights, whether for the specific enforcement of 
any covenant or agreement in this Indenture or in aid of the exercise of any 
power granted herein, or to secure any other proper remedy.

          SECTION 6.04.   TRUSTEE MAY FILE PROOFS OF CLAIM.

          In case of the pendency of any receivership, insolvency, 
liquidation, bankruptcy, reorganization, arrangement, adjustment, composition 
or other judicial proceeding relative to the Company or any other obligor 
upon the Securities or the property of the Company or of such other obligor 
or their creditors, the Trustee (irrespective of whether the principal of the 
Securities shall then be due and payable as therein expressed or by 
declaration or otherwise and irrespective of whether the Trustee shall have 
made any demand on the Company for the payment of overdue principal or 
interest) shall be entitled and empowered, by intervention in such proceeding 
or otherwise,

          (i) to file and prove a claim for the whole amount of principal 
     (and premium, if any) and interest owing and unpaid in respect of the 
     Securities and to file such other papers or documents as may be 
     necessary or advisable in order to have the claims of the Trustee 
     (including any claim for the reasonable compensation, expenses, 
     disbursements and advances of the Trustee, its agent and counsel) and of 
     the Holders allowed in such judicial proceedings, and

          (ii) to collect and receive any moneys or other property payable or 
     deliverable on any such claims and to distribute the same; and any 
     custodian, receiver, 

                                      -51-
<PAGE>


     assignee, trustee, liquidator, sequestrator or other similar official in 
     any such judicial proceeding is hereby authorized by each Holder to make 
     such payments to the Trustee and, in the event that the Trustee shall 
     consent to the making of such payments directly to the Holders, to pay 
     to the Trustee any amount due it for the reasonable compensation, 
     expenses, disbursements and advances of the Trustee, its agents and 
     counsel, and any other amounts due the Trustee under Section 7.07.

          Nothing herein contained shall be deemed to authorize the Trustee 
to authorize or consent to or accept or adopt on behalf of any Holder any 
plan of reorganization, arrangement, adjustment or composition affecting the 
Securities or the rights of any Holder thereof or to authorize the Trustee to 
vote in respect of the claim of any Holder in any such proceeding.

          SECTION 6.05.   TRUSTEE MAY ENFORCE CLAIMS WITHOUT POSSESSION OF 
SECURITIES.

          All rights of action and claims under this Indenture or the 
Securities may be prosecuted and enforced by the Trustee without the 
possession of any of the Securities or the production thereof in any 
proceeding relating thereto, and any such proceeding instituted by the 
Trustee shall be brought in its own name as trustee of an express trust, and 
any recovery of judgment shall, after provision for the payment of the 
reasonable compensation, expenses, disbursements and advances of the Trustee, 
its agents and counsel, be for the ratable benefit of the Holders of the 
Securities in respect of which such judgment has been recovered.

          SECTION 6.06.   APPLICATION OF MONEY COLLECTED.

          Any money collected by the Trustee pursuant to this Article in 
respect of the Securities of any series shall be applied in the following 
order, at the date or dates fixed by the Trustee and, in case of the 
distribution of such money on account of principal (or premium, if any) or 
interest, upon presentation of the Securities in respect of which moneys have 
been collected and the notation thereon of the payment if only partially paid 
and upon surrender thereof if fully paid:

          First:  To the payment of all amounts due the Trustee under Section 
7.07 applicable to such series;

          Second:  To the payment of the amounts then due and unpaid for 
principal of (and premium, if any) and interest on the Securities of such 
series in respect of which or for the benefit of which such money has been 
collected, ratably, without preference or priority of any kind, according to 
the amounts due and payable on such Securities of such series for principal 
(and premium, if any) and interest, respectively; and

          Third:  To the Company.

          The Trustee may fix a record date and payment date for any payment to
Holders pursuant to this Section 6.06.  At least fifteen (15) days before such
record date, the Trustee 

                                      -52-

<PAGE>

shall mail to each Holder and the Company a notice that states the record 
date, the payment date and the amount to be paid.

          SECTION 6.07.   LIMITATION ON SUITS.

          No Holder of any Security of any series shall have any right to 
institute any proceeding, judicial or otherwise, with respect to this 
Indenture, or for the appointment of a receiver or trustee, or for any other 
remedy hereunder, unless:

          (1) such Holder has previously given written notice to the Trustee 
     of a continuing Event of Default with respect to the Securities of that 
     series;

          (2) the Holders of not less than 25% in principal amount of the 
     Outstanding Securities of that series shall have made written request to 
     the Trustee to institute proceedings in respect of such Event of Default 
     in its own name as Trustee hereunder;

          (3) such Holder or Holders have offered to the Trustee reasonable 
     indemnity against the costs, expenses and liabilities to be incurred in 
     compliance with such request;

          (4) the Trustee for 60 days after its receipt of such notice, 
     request and offer of indemnity has failed to institute any such 
     proceeding; and

          (5) no direction inconsistent with such written request has been 
     given to the Trustee during such 60-day period by the Holders of a 
     majority in principal amount of the Outstanding Securities of that 
     series;

it being understood and intended that no one or more of Holders of Securities 
of any series shall have any right in any manner whatever by virtue of, or by 
availing of, any provision of this Indenture to affect, disturb or prejudice 
the rights of any other of such Holders, or to obtain or to seek to obtain 
priority or preference over any other of such Holders or to enforce any right 
under this Indenture, except in the manner herein provided and for the equal 
and ratable benefit of all Holders of Securities of the affected series.

          SECTION 6.08.   UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE 
PRINCIPAL, PREMIUM AND INTEREST.

          Notwithstanding any other provision in this Indenture, the Holder 
of any Security shall have the right, which is absolute and unconditional, to 
receive payment of the principal of (and premium, if any) and (subject to 
Section 3.07) interest on such Security on the Stated Maturity or Maturities 
expressed in such Security (or, in the case of redemption, on the Redemption 
Date) and to institute suit for the enforcement of any such payment, and such 
rights shall not be impaired without the consent of such Holder.

                                      -53-
<PAGE>

          SECTION 6.09.   RESTORATION OF RIGHTS AND REMEDIES.

          If the Trustee or any Holder has instituted any proceeding to 
enforce any right or remedy under this Indenture and such proceeding has been 
discontinued or abandoned for any reason, or has been determined adversely to 
the Trustee or to such Holder, then and in every such case, subject to any 
determination in such proceeding, the Company, the Trustee and the Holders 
shall be restored severally and respectively to their former positions 
hereunder and thereafter all rights and remedies of the Trustee and the 
Holders shall continue as though no such proceeding has been instituted.

          SECTION 6.10.   RIGHTS AND REMEDIES CUMULATIVE.

          Except as otherwise provided with respect to the replacement or 
payment of mutilated, destroyed, lost or stolen Securities in the last 
paragraph of Section 3.06, no right or remedy herein conferred upon or 
reserved to the Trustee or to the Holders is intended to be exclusive of any 
other right or remedy, and every right and remedy shall, to the extent 
permitted by law, be cumulative and in addition to every other right and 
remedy given hereunder or now or hereafter existing at law or in equity or 
otherwise.  The assertion or employment of any right or remedy hereunder, or 
otherwise, shall not prevent the concurrent assertion or employment of any 
other appropriate right or remedy.

          SECTION 6.11.   DELAY OR OMISSION NOT WAIVER.

          No delay or omission of the Trustee or of any Holder of any 
Securities to exercise any right or remedy accruing upon any Event of Default 
shall impair any such right or remedy or constitute a waiver of any such 
Event of Default or an acquiescence therein.  Every right and remedy given by 
this Article or by law to the Trustee or to the Holders may be exercised from 
time to time, and as often as may be deemed expedient, by the Trustee or by 
the Holders, as the case may be.

          SECTION 6.12.   CONTROL BY HOLDERS.

          The Holders of a majority in principal amount of the Outstanding 
Securities of any series shall have the right to direct the time, method and 
place of conducting any proceeding for any remedy available to the Trustee, 
or exercising any trust or power conferred on the Trustee, with respect to 
the Securities of such series, provided that:

          (1) such direction shall not be in conflict with any rule of law or 
     with this Indenture;

          (2) the Trustee may take any other action deemed proper by the 
     Trustee which is not inconsistent with such direction; and

          (3) subject to Section 7.01, the Trustee need not take any action 
     which might involve the Trustee in personal liability or be unduly 
     prejudicial to the Holders not joining therein.

                                      -54-
<PAGE>


          SECTION 6.13.   WAIVER OF PAST DEFAULTS.

          The Holders of not less than a majority in principal amount of the 
Outstanding Securities of any series may by written notice to the Trustee on 
behalf of the Holders of all the Securities of such series waive any Default 
or Event of Default with respect to such series and its consequences, except 
a Default or Event of Default

          (1) in respect of the payment of the principal of (or premium, if any)
     or interest on any Security of such series, or

          (2) in respect of a covenant or other provision hereof which under 
     Article Ten cannot be modified or amended without the consent of the 
     Holder of each Outstanding Security of such series affected.

          Upon any such waiver, such Default or Event of Default shall cease 
to exist and shall be deemed to have been cured, for every purpose of this 
Indenture and the Securities of such series; but no such waiver shall extend 
to any subsequent or other Default or Event of Default or impair any right 
consequent thereon.

          SECTION 6.14.   UNDERTAKING FOR COSTS.

          All parties to this Indenture agree, and each Holder of any 
Security by his acceptance thereof shall be deemed to have agreed, that any 
court may in its discretion require, in any suit for the enforcement of any 
right or remedy under this Indenture, or in any suit against the Trustee for 
any action taken, suffered or omitted by it as Trustee, the filing by any 
party litigant in such suit of an undertaking to pay the costs of such suit, 
and that such court may in its discretion assess reasonable costs, including 
reasonable attorneys' fees, against any party litigant in such suit, having 
due regard to the merits and good faith of the claims or defenses made by 
such party litigant; but the provisions of this Section shall not apply to 
any suit instituted by the Company, to any suit instituted by the Trustee, to 
any suit instituted by any Holder, or group of Holders, holding in the 
aggregate more than 10% in principal amount of the Outstanding Securities of 
any series, or to any suit instituted by any Holder for the enforcement of 
the payment of the principal of (or premium, if any) or interest on any 
Security on or after the Stated Maturity or Maturities expressed in such 
Security (or, in the case of redemption, on or after the Redemption Date).

          SECTION 6.15.   DEFAULTS UNDER FIRST MORTGAGE INDENTURE OR 
SUBSTITUTED MORTGAGE INDENTURE.

          In addition to every other right and remedy provided herein, the 
Trustee may exercise any right or remedy available to the Trustee in its 
capacity as owner and holder of Collateral Bonds or Substituted Collateral 
Bonds which arises as a result of a default under the First Mortgage 
Indenture or the Substituted Mortgage Indenture.

                                      -55-
<PAGE>
                                       
                                  ARTICLE VII

                                  THE TRUSTEE

          SECTION 7.01.   CERTAIN DUTIES AND RESPONSIBILITIES OF THE TRUSTEE.

          (a) Except during the continuance of an Event of Default, the 
Trustee's duties and responsibilities under this Indenture shall be governed 
by Section 315 (a) of the Trust Indenture Act.

          (b) In case an Event of Default has occurred and is continuing, and 
is known to the Trustee, the Trustee shall exercise the rights and powers 
vested in it by this Indenture, and shall use the same degree of care and 
skill in their exercise, as a prudent man would exercise or use under the 
circumstances in the conduct of his own affairs.

          (c) None of the provisions of Section 315 (d) of the Trust 
Indenture Act shall be excluded from this Indenture.

          SECTION 7.02.   NOTICE OF DEFAULTS.

          Within 30 days after the occurrence of any Default or Event of 
Default with respect to the Securities of any series, the Trustee shall give 
to all Holders of Securities of such series, as their names and addresses 
appear in the Security Register, notice of such Default or Event of Default 
known to the Trustee, unless such Default or Event of Default shall have been 
cured or waived; provided, however, that, except in the case of a Default or 
Event of Default in the payment of the principal of (or premium, if any) or 
interest on any Security of such series or in the payment of any sinking fund 
installment with respect to Securities of such series, the Trustee shall be 
protected in withholding such notice if and so long as the board of 
directors, the executive committee or a trust committee of directors and/or 
Responsible Officers of the Trustee in good faith determine that the 
withholding of such notice is in the interest of the Holders of Securities of 
such series.

          SECTION 7.03.   CERTAIN RIGHTS OF TRUSTEE.

          Subject to the provisions of the Trust Indenture Act:

          (a) the Trustee may rely and shall be protected in acting or 
refraining from acting upon any resolution, certificate, statement, 
instrument, opinion, report, notice, request, direction, consent, order, 
bond, debenture, note, other evidence of indebtedness or other paper or 
document believed by it to be genuine and to have been signed or presented by 
the proper party or parties;

          (b) any request or direction of the Company mentioned herein shall 
be sufficiently evidenced by a Company Request or Company Order and any 
resolution of the Board of Directors may be sufficiently evidenced by a Board 
Resolution;

                                      -56-
<PAGE>

          (c) whenever in the administration of this Indenture the Trustee 
shall deem it desirable that a matter be proved or established prior to 
taking, suffering or omitting any action hereunder, the Trustee (unless other 
evidence be herein specifically prescribed) may, in the absence of bad faith 
on its part, rely upon an Officer's Certificate;

          (d) the Trustee may consult with counsel and the written advice of 
such counsel or any Opinion of Counsel shall be full and complete 
authorization and protection in respect of any action taken, suffered or 
omitted by it hereunder in good faith and in reliance thereon;

          (e) the Trustee shall be under no obligation to exercise any of the 
rights or powers vested in it by this Indenture at the request or direction 
of any of the Holders pursuant to this Indenture, unless such Holders shall 
have offered to the Trustee security or indemnity to its reasonable 
satisfaction against the costs, expenses and liabilities which might be 
incurred by it in compliance with such request or direction;

          (f) prior to the occurrence of an Event of Default with respect to 
the Securities of any series and after the curing or waiving of all such 
Events of Default which may have occurred, the Trustee shall not be bound to 
make any investigation into the facts or matters stated in any resolution, 
certificate, statement, instrument, opinion, report, notice, request, 
direction, consent, order, approval or other paper or document, or the books 
and records of the Company, unless requested in writing to do so by the 
Holders of a majority in principal amount of the outstanding Securities of 
any series; provided, however, that if the payment within a reasonable time 
to the Trustee of the costs, expenses or liabilities likely to be incurred by 
it in the making of such investigation is not, in the opinion of the Trustee, 
reasonably assured to the Trustee by the security afforded to it by the terms 
of this Indenture, the Trustee may require reasonable indemnity against such 
costs, expenses or liabilities as a condition to so proceeding; the 
reasonable expense of every such investigation shall be paid by the Company 
or, if paid by the Trustee, shall be repaid by the Company upon demand;

          (g) the Trustee may execute any of the trusts or powers hereunder 
or perform any duties hereunder either directly or by or through agents or 
attorneys and the Trustee shall not be responsible for any misconduct or 
negligence on the part of any agent or attorney appointed with due care by it 
hereunder; and

          SECTION 7.04.   NOT RESPONSIBLE FOR RECITALS OR ISSUANCE OF 
SECURITIES.

          The recitals herein and in the Securities, except the Trustee's 
certificates of authentication, shall be taken as the statements of the 
Company, and the Trustee or any Authenticating Agent assumes no 
responsibility for their correctness.  The Trustee makes no representations 
as to the validity or sufficiency of this Indenture or of the Securities.  
Neither the Trustee nor any Authenticating Agent shall be accountable for the 
use or application by the Company of Securities or the proceeds thereof.

                                      -57-
<PAGE>

          SECTION 7.05.   MAY HOLD SECURITIES.

          The Trustee, any Authenticating Agent, any Paying Agent, any 
Security Registrar or any other agent of the Company, in its individual or 
any other capacity, may become the owner or pledgee of Securities and, 
subject to Sections 7.08 and 7.13, may otherwise deal with the Company with 
the same rights it would have if it were not Trustee, Authenticating Agent, 
Paying Agent, Security Registrar or such other agent.

          SECTION 7.06.   MONEY HELD IN TRUST.

          Money held by the Trustee in trust hereunder (including amounts 
held by the Trustee as Paying Agent) need not be segregated from other funds 
except to the extent required by law.  The Trustee may allow and credit the 
Company interest on any money received by it hereunder at such rate, if any, 
as may be agreed upon by the Company and the Trustee from time to time as may 
be permitted by law.

          SECTION 7.07.   COMPENSATION AND REIMBURSEMENT.

          The Company agrees

          (1) to pay to the Trustee from time to time reasonable compensation 
     for all services rendered by it hereunder (which compensation shall not 
     be limited by any provision of law in regard to the compensation of a 
     trustee of an express trust);

          (2) except as otherwise expressly provided herein, to reimburse the 
     Trustee upon its request for all reasonable expenses, disbursements and 
     advances incurred or made by the Trustee in accordance with any 
     provision of this Indenture (including the reasonable compensation and 
     the expenses and disbursements of its agents and counsel), except any 
     such expense, disbursement or advance as may be attributable to its 
     negligence or bad faith; and

          (3) to indemnify the Trustee for, and to hold it harmless against, 
     any loss, liability, damage, claim or expense, including taxes (other 
     than taxes based upon or determined or measured by the income of the 
     Trustee), incurred without negligence or bad faith on its part, arising 
     out of or in connection with the acceptance or administration of the 
     trust or trusts hereunder, including the costs and expenses of defending 
     itself against any claim or liability in connection with the exercise or 
     performance of any of its powers or duties hereunder.

          When the Trustee incurs expenses or renders services in connection 
with an Event of Default specified in Section 6.01(6) or Section 6.01(7), the 
expenses (including the reasonable charges and expenses of its counsel) and 
the compensation for the services are intended to constitute expenses of 
administration under any applicable federal or state bankruptcy, insolvency 
or other similar law.

          The provisions of this Section 7.07 shall survive this Indenture.

                                      -58-
<PAGE>

          SECTION 7.08.   DISQUALIFICATION; CONFLICTING INTERESTS.

          The Trustee shall be disqualified only where such disqualification 
is required by Section 310(b) of the Trust Indenture Act, provided that, to 
the extent permitted by law, Firstar Bank Milwaukee, N.A., National 
Association, shall not be deemed to have a conflicting interest for purposes 
of Section 310(b) of the Trust Indenture Act because of its capacity as 
trustee under the First Mortgage Indenture or the Substituted Mortgage 
Indenture.  Nothing shall prevent the Trustee from filing with the Commission 
the application referred to in the second to last paragraph of Section 310(b) 
of the Trust Indenture Act.

          SECTION 7.09.   CORPORATE TRUSTEE REQUIRED; ELIGIBILITY.

          There shall at all times be a Trustee hereunder which shall be 
eligible to act as Trustee under Section 310(a) (1) of the Trust Indenture 
Act having a combined capital and surplus of at least $50,000,000 subject to 
supervision or examination by federal or State authority.  If such 
corporation publishes reports of condition at least annually, pursuant to law 
or to the requirements of said supervising or examining authority, then for 
the purposes of this Section, the combined capital and surplus of such 
corporation shall be deemed to be its combined capital and surplus as set 
forth in its most recent report of condition so published.  Neither the 
Company nor any Person directly or indirectly controlling, controlled by, or 
under common control with the Company may serve as Trustee.  If at any time 
the Trustee shall cease to be eligible in accordance with the provisions of 
this Section, it shall resign immediately in the manner and with the effect 
hereinafter specified in this Article.

          SECTION 7.10.   RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR.

          (a) No resignation or removal of the Trustee and no appointment of 
a successor Trustee pursuant to this Article shall become effective until the 
acceptance of appointment by the successor Trustee in accordance with the 
applicable requirements of Section 7.11.

          (b) The Trustee may resign at any time with respect to the 
Securities of one or more series by giving written notice thereof to the 
Company.  If the instrument of acceptance by a successor Trustee required by 
Section 7.11 shall not have been delivered to the Trustee within 30 days 
after the giving of such notice of resignation, the resigning Trustee may 
petition any court of competent jurisdiction for the appointment of a 
successor Trustee with respect to the Securities of such series.

          (c) The Trustee may be removed at any time with respect to the 
Securities of any series by Act of the Holders of a majority in principal 
amount of the Outstanding Securities of such series, delivered to the Trustee 
and to the Company.

          (d) If at any time:

          (1) the Trustee shall fail to comply with Section 310(b) of the 
     Trust Indenture Act after written request therefor by the Company or by 
     any Holder who has been a bona fide Holder of a Security for at least 
     six months; or

                                      -59-
<PAGE>


          (2) the Trustee shall cease to be eligible under Section 7.09 and 
     shall fail to resign after written request therefor by the Company or by 
     any such Holder of a Security who has been a bona fide Holder of a 
     Security for at least six months; or

          (3) the Trustee shall become incapable of acting or shall be 
     adjudged a bankrupt or insolvent or a receiver of the Trustee or of its 
     property shall be appointed or any public officer shall take charge or 
     control of the Trustee or of its property or affairs for the purpose of 
     rehabilitation, conservation or liquidation;

then, in any such case, (i) the Company by a Board Resolution may remove the 
Trustee with respect to all Securities, or (ii) subject to Section 315(e) of 
the Trust Indenture Act, any Holder who has been a bona fide Holder of a 
Security for at least six months may, on behalf of himself and all others 
similarly situated, petition any court of competent jurisdiction for the 
removal of the Trustee with respect to all Securities and the appointment of 
a successor Trustee or Trustees.

          (e) If the Trustee shall resign, be removed or become incapable of 
acting, or if a vacancy shall occur in the office of Trustee for any cause, 
with respect to the Securities of one or more series, the Company, by a Board 
Resolution, shall promptly appoint a successor Trustee or Trustees with 
respect to the Securities of that or those series (it being understood that 
any such successor Trustee may be appointed with respect to the Securities of 
one or more or all of such series and that at any time there shall be only 
one Trustee with respect to the Securities of any particular series) and 
shall comply with the applicable requirements of Section 7.11.  If, within 
one year after such resignation, removal or incapability, or the occurrence 
of such vacancy, a successor Trustee with respect to the Securities of any 
series shall be appointed by Act of the Holders of a majority in principal 
amount of the Outstanding Securities of such series delivered to the Company 
and the retiring Trustee, the successor Trustee so appointed shall, forthwith 
upon its acceptance of such appointment in accordance with the applicable 
requirements of Section 7.11, become the successor Trustee with respect to 
the Securities of such series and to that extent supersede the successor 
Trustee appointed by the Company with respect to such Securities.  If no 
successor Trustee with respect to the Securities of any series shall have 
been so appointed by the Company or the Holders and accepted appointment in 
the manner required by Section 7.11, any Holder who has been a bona fide 
Holder of a Security of such series for at least six months may, on behalf of 
himself and all others similarly situated, petition any court of competent 
jurisdiction for the appointment of a successor Trustee with respect to the 
Securities of such series.

          (f) The Company shall give notice of each resignation and each 
removal of the Trustee with respect to the Securities of any series and each 
appointment of a successor Trustee with respect to the Securities of any 
series by mailing written notice of such event by first-class mail, postage 
prepaid, to all Holders of Securities of such series as their names and 
addresses appear in the Security Register.  Each notice shall include the 
name of the successor Trustee with respect to the Securities of such series 
and the address of its Corporate Trust Office.

                                      -60-
<PAGE>

          SECTION 7.11.   ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.

          (a) In case of the appointment hereunder of a successor Trustee 
with respect to all Securities, every such successor Trustee so appointed 
shall execute, acknowledge and deliver to the Company and to the retiring 
Trustee an instrument accepting such appointment, and thereupon the 
resignation or removal of the retiring Trustee shall become effective and 
such successor Trustee, without any further act, deed or conveyance, shall 
become vested with all the rights, powers, trusts and duties of the retiring 
Trustee; but, on the request of the Company or the successor Trustee, such 
retiring Trustee shall, upon payment of its charges, execute and deliver an 
instrument transferring to such successor Trustee all the rights, powers and 
trusts of the retiring Trustee and shall duly assign, transfer and deliver to 
such successor Trustee all property and money held by such retiring Trustee 
hereunder.

          (b) In case of the appointment hereunder of a successor Trustee 
with respect to the Securities of one or more (but not all) series, the 
Company, the retiring Trustee and each successor Trustee with respect to the 
Securities of one or more series shall execute and deliver an indenture 
supplemental hereto wherein each successor Trustee shall accept such 
appointment and which (1) shall contain such provisions as shall be necessary 
or desirable to transfer and confirm to, and to vest in, each successor 
Trustee all the rights, powers, trusts and duties of the retiring Trustee 
with respect to the Securities of that or those series to which the 
appointment of such successor Trustee relates, (2) if the retiring Trustee is 
not retiring with respect to all Securities, shall contain such provisions as 
shall be deemed necessary or desirable to confirm that all the rights, 
powers, trusts and duties of the retiring Trustee with respect to the 
Securities of that or those series as to which the retiring Trustee is not 
retiring shall continue to be vested in the retiring Trustee, and (3) shall 
add to or change any of the provisions of this Indenture as shall be 
necessary to provide for or facilitate the administration of the trusts 
hereunder by more than one Trustee, it being understood that nothing herein 
or in such supplemental indenture shall constitute such Trustees co-trustees 
of the same trust and that each such Trustee shall be trustee of a trust or 
trusts hereunder separate and apart from any trust or trusts hereunder 
administered by any other such Trustee; and upon the execution and delivery 
of such supplemental indenture, the resignation or removal of the retiring 
Trustee shall become effective to the extent provided therein and each such 
successor Trustee, without any further act, deed or conveyance, shall become 
vested with all the rights, powers, trusts and duties of the retiring Trustee 
with respect to the Securities of that or those series to which the 
appointment of such successor Trustee relates; but, on request of the Company 
or any successor Trustee, such retiring Trustee shall duly assign, transfer 
and deliver to such successor Trustee all property and money held by such 
retiring Trustee hereunder with respect to the Securities of that or those 
series to which the appointment of such successor Trustee relates.

          (c) Upon request of any such successor Trustee, the Company shall 
execute any and all instruments for more fully and certainly vesting in and 
confirming to such successor Trustee all such rights, powers and trusts 
referred to in paragraph (a) or (b) of this Section, as the case may be.

                                      -61-
<PAGE>

          (d) No successor Trustee shall accept its appointment unless at the 
time of such acceptance such successor Trustee shall be qualified and 
eligible under the Trust Indenture Act.

          SECTION 7.12.   MERGER, CONVERSION, CONSOLIDATION OR SUCCESSION TO
BUSINESS.

          Any corporation into which the Trustee may be merged or converted 
or with which it may be consolidated, or any corporation resulting from any 
merger, conversion or consolidation to which the Trustee shall be a party, or 
any corporation succeeding to all or substantially all the corporate trust 
business of the Trustee, shall be the successor of the Trustee hereunder, 
provided such corporation shall be otherwise qualified and eligible under 
this Article, without the execution or filing of any paper or any further act 
on the part of any of the parties hereto.  In case any Securities shall have 
been authenticated, but not delivered, by the Trustee then in office, any 
successor by merger, conversion or consolidation to such authenticating 
Trustee may adopt such authentication and deliver the Securities so 
authenticated with the same effect as if such successor Trustee had itself 
authenticated such Securities.

          SECTION 7.13.   PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.

          The Trustee shall comply with Section 311(a) of the Trust Indenture 
Act, excluding any creditor relationship listed in Section 311(b) of the 
Trust Indenture Act.  A Trustee who has resigned or been removed shall be 
subject to Section 311(a) of the Trust Indenture Act to the extent indicated 
therein.

          SECTION 7.14.   APPOINTMENT OF AUTHENTICATING AGENT.

          At any time when any of the Securities remain Outstanding the 
Trustee may appoint an Authenticating Agent or Agents with respect to one or 
more series of Securities which shall be authorized to act on behalf of, and 
subject to the direction of, the Trustee to authenticate Securities of such 
series issued upon exchange, registration of transfer or partial redemption 
thereof or pursuant to Section 3.06, and Securities so authenticated shall be 
entitled to the benefits of this Indenture and shall be valid and obligatory 
for all purposes as if authenticated by the Trustee hereunder.  Wherever 
reference is made in this Indenture to the authentication and delivery of 
Securities by the Trustee or the Trustee's certificate of authentication, 
such reference shall be deemed to include authentication and delivery on 
behalf of the Trustee by an Authenticating Agent and a certificate of 
authentication executed on behalf of the Trustee by an Authenticating Agent.  
Each Authenticating Agent shall be acceptable to the Company and shall at all 
times be a corporation organized and doing business under the laws of the 
United States of America, any State thereof or the District of Columbia, 
authorized under such laws to act as Authenticating Agent, having a combined 
capital and surplus of not less than $50,000,000 and subject to supervision 
or examination by federal or State authority.  If such Authenticating Agent 
publishes reports of condition at least annually, pursuant to law or to the 
requirements of said supervising or examining authority, then for the 
purposes of this Section, the combined capital and surplus of such 
Authenticating Agent shall be deemed to be 

                                      -62-

<PAGE>

its combined capital and surplus as set forth in its most recent report of 
condition so published.  If at any time an Authenticating Agent shall cease 
to be eligible in accordance with the provisions of this Section, such 
Authenticating Agent shall resign immediately in the manner and with the 
effect specified in this Section.

          Any corporation into which an Authenticating Agent may be merged or 
converted or with which it may be consolidated, or any corporation resulting 
from any merger, conversion or consolidation to which such Authenticating 
Agent shall be a party, or any corporation succeeding to the corporate agency 
or corporate trust business of an Authenticating Agent, shall continue to be 
an Authenticating Agent, provided such corporation shall be otherwise 
eligible under this Section, without the execution or filing of any paper or 
any further act on the part of the Trustee or the Authenticating Agent.

          An Authenticating Agent may resign at any time by giving written 
notice thereof to the Trustee and to the Company.  The Trustee may at any 
time terminate the agency of an Authenticating Agent by giving written notice 
thereof to such Authenticating Agent and to the Company.  Upon receiving such 
a notice of resignation or upon such a termination, or in case at any time 
such Authenticating Agent shall cease to be eligible in accordance with the 
provisions of this Section, the Trustee may appoint a successor 
Authenticating Agent which shall be acceptable to the Company and shall mail 
written notice of such appointment by first-class mail, postage prepaid, to 
all Holders of Securities of the series with respect to which such 
Authenticating Agent will serve, as their names and addresses appear in the 
Security Register.  Any successor Authenticating Agent upon acceptance of its 
appointment hereunder shall become vested with all the rights, powers and 
duties of its predecessor hereunder, with like effect as if originally named 
as an Authenticating Agent. No successor Authenticating Agent shall be 
appointed unless eligible under the provisions of this Section.

          The Company agrees to pay to each Authenticating Agent from time to 
time reasonable compensation for its services under this Section.

          If an appointment with respect to one or more series is made 
pursuant to this Section, the Securities of such series may have endorsed 
thereon, in addition to the Trustee's certificate of authentication, an 
alternate certificate of authentication in the following form:

                         Form of Authenticating Agent's
                         Certificate of Authentication

Dated:
       ---------------

                                      -63-
<PAGE>

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

                                              ---------------------------------
                                                                    As Trustee

                                              By
                                                 ------------------------------
                                                        As Authenticating Agent


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


                                      -64-
<PAGE>
                                       
                                  ARTICLE VIII

                 HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

          SECTION 8.01.   COMPANY TO FURNISH TRUSTEE NAMES AND ADDRESSES OF
HOLDERS.

          The Company will furnish or cause to be furnished to the Trustee:

          (a) semi-annually, not later than January 1 and July 1 in each 
year, a list, in such form as the Trustee may reasonably require, of the 
names and addresses of the Holders as of the preceding December 15 or June 
15, as the case may be; and

          (b) at such other times as the Trustee may request in writing, 
within 30 days after the receipt by the Company of any such request, a list 
of similar form and content as of a date not more than 15 days prior to the 
time such list is furnished;

provided, however, that so long as the Trustee is the Security Registrar, no 
such list shall be required to be furnished.

          SECTION 8.02.   PRESERVATION OF INFORMATION; COMMUNICATIONS TO 
HOLDERS.

          (a) The Trustee shall preserve, in as current a form as is 
reasonably practicable, the names and addresses of Holders contained in the 
most recent list furnished to the Trustee as provided in Section 8.01 and the 
names and addresses of Holders received by the Trustee in its capacity as 
Security Registrar.  The Trustee may destroy any list furnished to it as 
provided in Section 8.02 upon receipt of a new list so furnished.

          (b) If three or more Holders (herein referred to as "applicants") 
apply in writing to the Trustee, and furnish to the Trustee reasonable proof 
that each such applicant has owned a Security for a period of at least six 
months preceding the date of such application, and such application states 
that the applicants desire to communicate with other Holders with respect to 
their rights under this Indenture or under the Securities and is accompanied 
by a copy of the form of proxy or other communication which such applicants 
propose to transmit, then the Trustee shall, within five Business Days after 
the receipt of such application, at its election, either

          (i) afford such applicants access to the information preserved at 
     the time by the Trustee in accordance with Section 8.02(a); or

          (ii) inform such applicants as to the approximate number of Holders 
     whose names and addresses appear in the information preserved at the 
     time by the Trustee in accordance with Section 8.02 (a), and as to the 
     approximate cost of mailing to such Holders the form of proxy or other 
     communication, if any, specified in such application.

                                      -65-
<PAGE>

          If the Trustee shall elect not to afford such applicants access to 
such information, the Trustee shall, upon the written request of such 
applicants, mail to each Holder whose name and address appears in the 
information preserved at the time by the Trustee in accordance with Section 
8.02 (a) a copy of the form of proxy or other communication which is 
specified in such request, with reasonable promptness after a tender to the 
Trustee of the material to be mailed and of payment, or provision for the 
payment, of the reasonable expenses of mailing, unless within five days after 
such tender the Trustee shall mail to such applicants and file with the 
Commission, together with a copy of the material to be mailed, a written 
statement to the effect that, in the opinion of the Trustee, such mailing 
would be contrary to the best interest of the Holders or would be in 
violation of applicable law.  Such written statement shall specify the basis 
of such opinion.  If the Commission, after opportunity for a hearing upon the 
objections specified in the written statement so filed, shall enter an order 
refusing to sustain any of such objections or if, after the entry of an order 
sustaining one or more of such objections, the Commission shall find, after 
notice and opportunity for hearing, that all objections so sustained have 
been met and shall enter an order so declaring, the Trustee shall mail copies 
of such material to all such Holders with reasonable promptness after the 
entry of such order and the renewal of such tender; otherwise the Trustee 
shall be relieved of any obligation or duty to such applicants respecting 
their application.

          (c) Every Holder of Securities, by receiving and holding the same, 
agrees with the Company and the Trustee that neither the company nor the 
Trustee nor any agent of either of them shall be held accountable by reason 
of the disclosure of any such information as to the names and addresses of 
the Holders in accordance with Section 8.02(b), regardless of the source from 
which such information was derived, and that the Trustee shall not be held 
accountable by reason of mailing any material pursuant to a request made 
under Section 8.02(b).

          SECTION 8.03.   REPORTS BY TRUSTEE.

          (a) Within 60 days after May 15 of each year commencing with the 
year 1999, the Trustee shall transmit by mail to all Holders of Securities as 
provided in Section 313(c) of the Trust Indenture Act, a brief report dated 
as of May 15, if required by and in compliance with Section 313(a) of the 
Trust Indenture Act.

          (b) The Trustee shall from time to time transmit by mail to all 
Holders of Securities as provided in Section 313(c) of the Trust Indenture 
Act brief reports that comply, both as to content and date of delivery, with 
Section 313(b) of the Trust Indenture Act (to the extent required by such 
Section).

          (c) A copy of each such report shall, at the time of such 
transmission to Holders, be filed by the Trustee with each stock exchange 
upon which any Securities are listed, with the Commission and with the 
Company.  The Company will notify the Trustee when any Securities are listed 
on any stock exchange.

                                      -66-
<PAGE>

          SECTION 8.04.   REPORTS BY COMPANY.

          The Company shall:

          (1) file with the Trustee, within 30 days after the Company is 
     required to file the same with the Commission, copies of the annual 
     reports and of the information, documents and other reports (or copies 
     of such portions of any of the foregoing as the Commission may from time 
     to time by rules and regulations prescribe) which the Company may be 
     required to file with the Commission pursuant to Section 13 or Section 
     15(d) of the Exchange Act; or, if the Company is not required to file 
     information, documents or reports pursuant to either of said Sections, 
     then it shall file with the Trustee and the Commission, in accordance 
     with rules and regulations prescribed from time to time by the 
     Commission, such of the supplementary and periodic information, 
     documents and reports which may be required pursuant to Section 13 of 
     the Exchange Act in respect of a security listed and registered on a 
     national securities exchange as may be prescribed from time to time in 
     such rules and regulations;

          (2) file with the Trustee and the Commission, in accordance with 
     rules and regulations prescribed from time to time by the Commission, 
     such additional information, documents and reports with respect to 
     compliance by the Company with the conditions and covenants of this 
     Indenture as may be required from time to time by such rules and 
     regulations;

          (3) transmit by mail to all Holders, as their names and addresses 
     appear in the Security Register, within 30 days after the filing thereof 
     with the Trustee, such summaries of any information, documents and 
     reports required to be filed by the Company pursuant to paragraphs (1) 
     and (2) of this Section as may be required by rules and regulations 
     prescribed from time to time by the Commission; and

          (4) furnish to the Trustee, on or before May 1 of each year, a 
     brief certificate from the principal executive officer, principal 
     financial officer or principal accounting officer as to his or her 
     knowledge of the Company's compliance with all conditions and covenants 
     under this Indenture.  For purposes of this paragraph, such compliance 
     shall be determined without regard to any period of grace or requirement 
     of notice provided under this Indenture.  Such certificate need not 
     comply with Section 1.02.

                                      -67-
<PAGE>

                                    ARTICLE IX

                  CONSOLIDATION, MERGER, LEASE, SALE OR TRANSFER

          SECTION 9.01.   THEN COMPANY MAY MERGE, ETC.

          The Company shall not consolidate with, or merge with or into any
other corporation (whether or not the Company shall be the surviving
corporation), or sell, assign, transfer or lease all or substantially all of its
properties and assets as an entirety or substantially as an entirety to any
Person or group of affiliated Persons, in one transaction or a series of related
transactions, unless:

          (1) either the Company shall be the continuing Person or the Person 
     (if other than the Company) formed by such consolidation or with which 
     or into which the Company is merged or the Person (or group of 
     affiliated Persons) to which all or substantially all the properties and 
     assets of the Company as an entirety or substantially as an entirety are 
     sold, assigned, transferred or leased shall be a corporation (or 
     constitute corporations) and shall expressly assume, by an indenture 
     supplemental hereto, executed and delivered to the Trustee, in form 
     satisfactory to the Trustee, all the obligations of the Company under 
     the Securities and this Indenture and, if prior to the Release Date, 
     shall expressly assume, by an indenture supplemental to the Mortgage 
     Indenture or, if on or after the Release Date, by an indenture 
     supplemental to any Substituted Mortgage Indenture, all of the 
     obligations of the Company under any outstanding Collateral Bonds or 
     Substituted Collateral Bonds and under the Mortgage Indenture or any 
     Substituted Mortgage Indenture, executed and delivered to the Mortgage 
     Trustee or the trustee under any Substituted Mortgage Indenture, as the 
     case may be, in form satisfactory to the Mortgage Trustee or the trustee 
     under the Substituted Mortgage Indenture; and

          (2) immediately before and after giving effect to such transaction 
     or series of related transactions, no Event of Default, and no Default, 
     shall have occurred and be continuing.

          SECTION 9.02.   OPINION OF COUNSEL.

          The Company shall deliver to the Trustee prior to the proposed
transaction(s) covered by Section 9.01 an Officer's Certificate and an Opinion
of Counsel stating that the transaction(s) and such supplemental indenture
comply with this Indenture and that all conditions precedent to the consummation
of the transaction(s) under this Indenture have been met.

          SECTION 9.03.   SUCCESSOR CORPORATION SUBSTITUTED.

          Upon any consolidation by the Company with or merger by the Company
into any other corporation or any lease, sale, assignment, or transfer of all or
substantially all of the property and assets of the Company in accordance with
Section 9.01, the successor corporation 

                                      -68-
<PAGE>

formed by such consolidation or into which the Company is merged or the 
successor corporation or affiliated group of corporations to which such 
lease, sale, assignment, or transfer is made shall succeed to, and be 
substituted for, and may exercise every right and power of, the Company under 
this Indenture with the same effect as if such successor corporation or 
corporations had been named as the Company herein, and thereafter, except in 
the case of a lease, the predecessor corporation or corporations shall be 
relieved of all obligations and covenants under this Indenture and the 
Securities and in the event of such conveyance or transfer, except in the 
case of a lease, any such predecessor corporation may be dissolved and 
liquidated.


                                      -69-
<PAGE>

                                  ARTICLE X

                           SUPPLEMENTAL INDENTURES

          SECTION 10.01.  SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF HOLDERS.

          Without notice to or the consent of any Holders, the Company, when 
authorized by a Board Resolution, and the Trustee, at any time and from time 
to time, may enter into one or more indentures supplemental hereto, in form 
satisfactory to the Trustee, for any of the following purposes:

          (1) to evidence the succession of another corporation to the 
     Company and the assumption by any such successor of the covenants of the 
     Company herein and in the Securities; or

          (2) to add to the covenants of the Company for the benefit of the 
     Holders of all or any series of Securities (and if such covenants are to 
     be for the benefit of less than all series of Securities, stating that 
     such covenants are expressly being included solely for the benefit of 
     such series) or to surrender any right or power herein conferred upon 
     the Company; or

          (3) to add any additional Events of Default with respect to all or 
     any series of Securities; or

          (4) to add or change any of the provisions of this Indenture to 
     such extent as shall be necessary to permit or facilitate the issuance 
     of Securities in bearer form, registrable or not registrable as to 
     principal, and with or without interest coupons; or

          (5) to change or eliminate any of the provisions of this Indenture, 
     provided that any such change or elimination shall become effective only 
     when there is no Security Outstanding of any series created prior to the 
     execution of such supplemental indenture which is entitled to the 
     benefit of such provision; or

          (6) to establish the form or terms of Securities of any series as 
     permitted by Sections 2.01 and 3.01; or

          (7) to evidence and provide for the acceptance of appointment 
     hereunder by a successor Trustee with respect to the Securities of one 
     or more series and to add to or change any of the provisions of this 
     Indenture as shall be necessary to provide for or facilitate the 
     administration of the trusts hereunder by more than one Trustee, 
     pursuant to the requirements of Section 7.11(b); or

          (8) to cure any ambiguity, defect or inconsistency or to correct or 
     supplement any provision herein which may be inconsistent with any other 
     provision herein; or

                                      -70-
<PAGE>

          (9) to make any change that does not materially adversely affect 
     the interests of the Holders of Securities of any series.

          Upon request of the Company, accompanied by a Board Resolution
authorizing the execution of any such supplemental indenture, and upon receipt
by the Trustee of the documents described in (and subject to the last sentence
of) Section 10.03, the Trustee shall join with the Company in the execution of
any supplemental indenture authorized or permitted by the terms of this
Indenture.

          SECTION 10.02.  SUPPLEMENTAL INDENTURES WITH CONSENT OF HOLDERS.

          With the written consent of the Holders of a majority in principal
amount of the Outstanding Securities of each series affected by such
supplemental indenture, by Act of said Holders delivered to the Company and the
Trustee, the Company, when authorized by a Board Resolution, and the Trustee
shall, subject to Section 10.03, enter into an indenture or indentures
supplemental hereto for the purpose of adding any provisions to or changing in
any manner or eliminating any of the provisions of this Indenture or of
modifying in any manner the rights of the Holders of Securities of such series
under this Indenture; provided, however, that no such supplemental indenture
shall, without the consent of the Holder of each Outstanding Security affected
thereby,

          (1) change the Stated Maturity of the principal of, or any 
     installment of principal of or interest on, any Security, or reduce the 
     principal amount thereof or the rate of interest thereon or any premium 
     payable upon the redemption thereof or extend the time for payment 
     thereof, or reduce the amount of the principal of an Original Issue 
     Discount Security that would be due and payable upon a declaration of 
     acceleration of the Maturity thereof pursuant to Section 6.02, or change 
     any Place of Payment where, or the coin or currency in which, any 
     Security or any premium or the interest thereon is payable, or impair 
     the right to institute suit for the enforcement of any such payment on 
     or after the Stated Maturity thereof (or, in the case of redemption, on 
     or after the Redemption Date), or impair the interest hereunder of the 
     Trustee in the Collateral Bonds or Substituted Collateral Bonds, or 
     reduce the principal amount of any issue of Collateral Bonds (except, as 
     provided in this Indenture, upon the Release Date) or Substituted 
     Collateral Bonds to an amount less than the principal amount of the 
     Related Series of Securities or alter the payment provisions of such 
     Collateral Bonds or Substituted Collateral Bonds in a manner adverse to 
     the Holders of the Securities, in each case without the consent of the 
     Holder of each Security so affected; or

          (2) reduce the percentage in principal amount of the Outstanding 
     Securities of any series, the consent of whose Holders is required for 
     any such supplemental indenture, or the consent of whose Holders is 
     required for any waiver of compliance with certain provisions of this 
     Indenture or Defaults or Events of Default hereunder and their 
     consequences provided for in this Indenture; or

                                      -71-
<PAGE>

          (3) change the redemption provisions (including Article Twelve) 
     hereof in a manner adverse to such Holder; or

          (4) modify any of the provisions of this Section or Section 6.13, 
     except to increase any such percentage or to provide that certain other 
     provisions of this Indenture cannot be modified or waived without the 
     consent of the Holder of each Outstanding Security affected thereby; 
     provided, however, that this clause shall not be deemed to require the 
     consent of any Holder with respect to changes in the references to "the 
     Trustee" and concomitant changes in this Section, or the deletion of 
     this proviso, in accordance with the requirements of Sections 7.11(b) 
     and 10.01(7).

A supplemental indenture which changes or eliminates any covenant or other
provisions of this Indenture which has expressly been included solely for the
benefit of one or more particular series of Securities, or which modifies the
rights of the Holders of Securities of such series with respect to such covenant
or other provision, shall be deemed not to affect the rights under this
Indenture of the Holders of Securities of any other series.

          It shall not be necessary for any Act of Holders under this Section to
approve the particular form of any proposed supplemental indenture, but it shall
be sufficient if such Act shall approve the substance thereof.

          SECTION 10.03.  EXECUTION OF SUPPLEMENTAL INDENTURES.

          The Trustee shall sign any supplemental indenture authorized pursuant
to this Article, subject to the last sentence of this Section 10.03.  In
executing, or accepting the additional trusts created by, any supplemental
indenture permitted by this Article or the modifications thereby of the trusts
created by this Indenture, the Trustee shall be entitled to receive, and
(subject to Section 7.01) shall be fully protected in relying upon, an Officer's
Certificate and an Opinion of Counsel stating that the execution of such
supplemental indenture is authorized or permitted by this Indenture.  The
Trustee may, but shall not be obligated to, enter into any such supplemental
indenture which affects the Trustee's own rights, duties or immunities under
this Indenture or otherwise.

          SECTION 10.04.  EFFECT OF SUPPLEMENTAL INDENTURES.

          Upon the execution of any supplemental indenture under this Article,
this Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of Securities theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.

          SECTION 10.05.  CONFORMITY WITH TRUST INDENTURE ACT.

          Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act as then in effect.

                                      -72-
<PAGE>

          SECTION 10.06.  REFERENCE IN SECURITIES TO SUPPLEMENTAL INDENTURES.

          Securities of any series authenticated and delivered after the 
execution of any supplemental indenture pursuant to this Article may, and 
shall if required by the Trustee, bear a notation in form approved by the 
Trustee as to any matter provided for in such supplemental indenture.  If the 
Company shall so determine, new Securities of any series so modified as to 
conform, in the opinion of the Trustee and the Company, to any such 
supplemental indenture may be prepared and executed by the Company and 
authenticated and delivered by the Trustee in exchange for Outstanding 
Securities of such series.

                                      -73-
<PAGE>

                                   ARTICLE XI

                                   COVENANTS

          SECTION 11.01.  PAYMENTS OF PRINCIPAL AND INTEREST.

          With respect to each series of Securities, the Company will duly 
and punctually pay the principal of (and premium, if any) and interest on 
such Securities in accordance with their terms and this Indenture, and will 
duly comply with all the other terms, agreements and conditions contained in, 
or made in the Indenture for the benefit of, the Securities of such series.

          SECTION 11.02.  MAINTENANCE OF OFFICE OR AGENCY.

          The Company will maintain an office or agency in each Place of 
Payment where Securities may be surrendered for registration of transfer or 
exchange or for presentation for payment, where notices and demands to or 
upon the Company in respect of the Securities and this Indenture may be 
served.  The Company will give prompt written notice to the Trustee of the 
location, and any change in location, of such office or agency.  If at any 
time the Company shall fail to maintain any such required office or agency or 
shall fail to furnish the Trustee with the address thereof, such 
presentations, surrenders, notices and demands may be made or served at the 
address of the Trustee as set forth in Section 1.05.

          The Company may also from time to time designate one or more other 
offices or agencies where the Securities may be presented or surrendered for 
any or all such purposes and may from time to time rescind such designations. 
The Company will give prompt written notice to the Trustee of any such 
designation or rescission and of any change in the location of any such other 
office or agency.

          Unless otherwise set forth in, or pursuant to, a Board Resolution 
or Indenture supplemental hereto with respect to a series of Securities, the 
Company hereby initially designates the Corporate Trust Office of Firstar 
Bank Milwaukee, National Association, in Milwaukee, Wisconsin, as such office 
of the Company.

          SECTION 11.03.  CORPORATE EXISTENCE.

          Subject to Article IX, the Company will do or cause to be done all 
things necessary to preserve and keep in full force and effect its corporate 
existence and the rights (charter and statutory) and franchises of the 
Company; provided, however, that the Company shall not be required to 
preserve any such right or franchise if the Board of Directors shall 
determine that the preservation thereof is no longer desirable in the conduct 
of the business of the Company.

                                      -74-
<PAGE>

          SECTION 11.04.  PAYMENT OF TAXES AND OTHER CLAIMS.

          The Company will pay or discharge, or cause to be paid or 
discharged, before the same shall become delinquent, (l) all material taxes, 
assessments and governmental charges levied or imposed upon the Company or 
upon the income, profits or property of the Company, and (2) all lawful 
claims for labor, materials and supplies which, if unpaid, might by law 
become a material lien upon the property of the Company; provided, however, 
that the Company shall not be required to pay or discharge or cause to be 
paid or discharged any such tax, assessment, charge or claim whose amount, 
applicability or validity is being contested in good faith by appropriate 
proceedings and for which adequate provision has been made.

          SECTION 11.05.  MAINTENANCE OF PROPERTIES.

          The Company will cause all material properties used or useful in 
the conduct of its business to be maintained and kept in good condition, 
repair and working order (normal wear and tear excepted) and supplied with 
all necessary equipment and will cause to be made all necessary repairs, 
renewals, replacements, betterments and improvements thereof, all as in the 
judgment of the Company may be necessary, so that the business carried on in 
connection therewith may be properly and advantageously conducted at all 
times; provided, however, that nothing in this Section shall prevent the 
Company from discontinuing the operation or maintenance of any of such 
properties, or disposing of any of them, if such discontinuance or disposal 
is, in the judgment of the Board of Directors, desirable in the conduct of 
the business of the Company.

          SECTION 11.06.  OPINIONS OF COUNSEL.  The Company will cause this 
Indenture, any indentures supplemental to this Indenture, and any financing 
or continuation statements to be promptly recorded and filed and rerecorded 
and refiled in such a manner and in such places, as may be required by law in 
order fully to preserve, protect and perfect the security of the Holders and 
all rights of the Trustee, and shall deliver to the Trustee:

          (a)  Promptly after the execution and delivery of this Indenture 
and of any indenture supplemental to this Indenture but prior to the Release 
date, an Opinion of Counsel either stating that, in the opinion of such 
counsel, this Indenture or such supplemental indenture and any financing of 
continuation statements have been properly recorded and filed so as to make 
effective and to perfect the interest of the Trustee in the Collateral Bonds 
intended to be created by this Indenture for the benefit of the Holders from 
time to time of the Securities, and reciting the details of such action, or 
stating that, in the opinion of such counsel, no such action is necessary to 
perfect or make such interest effective and stating what, if any, action of 
the foregoing character may reasonably be expected to become necessary prior 
to the next succeeding May 1 to maintain, perfect and make such interest 
effective; and

          (b)  On or before May 1 of each year, commencing May 1, 1999, and 
prior to the Release Date, an Opinion of Counsel either stating that in the 
opinion of such counsel such action has been taken, since the date of the 
most recent Opinion of Counsel furnished pursuant to this Section 11.06(b) or 
the first Opinion of Counsel furnished pursuant to Section 11.06(a) 

                                      -75-
<PAGE>

hereof, with respect to the recording, filing, rerecording, or refiling of 
this Indenture, each supplemental indenture and any financing or continuation 
statements, as is necessary to maintain and perfect the interest of the 
Trustee in the Collateral Bonds intended to be created by this Indenture for 
the benefit of the Holders from time to time of the Securities, and reciting 
the details of such action, or stating that in the opinion of such counsel no 
such action is necessary to maintain and perfect such interest and stating 
what, if any, action of the foregoing character may reasonably be expected to 
become necessary prior to the next succeeding May 1 to maintain, perfect and 
make such security interest effective.

          SECTION 11.07. COMPLIANCE CERTIFICATES.

          (a)  The Company shall deliver to the Trustee within 90 days after 
the end of each fiscal year of the Company (which fiscal year currently ends 
on December 31), an Officer's Certificate stating whether or not the signer 
knows of any Default or Event of Default by the Company that occurred prior 
to the end of the fiscal year and is then continuing.  If the signer does 
know of such a Default or Event of Default, the certificate shall describe 
each such Default or Event of Default and its status and the specific section 
or sections of this Indenture in connection with which such Default or Event 
of Default has occurred.  The Company shall also promptly notify the Trustee 
in writing should the Company's fiscal year be changed so that the end 
thereof is on any date other than the date on which the Company's fiscal year 
currently ends.  The certificate need not comply with Section 1.02.

          (b)  The Company shall deliver to the Trustee, within 10 days after 
the occurrence thereof, notice of any default which with the giving of notice 
and the lapse of time would be an Event of Default within the meaning of 
Section 6.01(4) or (5).

          (c)  The Company shall deliver to the Trustee forthwith upon 
becoming aware of a Default or Event of Default (but in no event later than 
10 days after the occurrence of each Default or Event of Default that is 
continuing), an Officer's Certificate setting forth the details of such 
Default or Event of Default and the action that the Company proposes to take 
with respect thereto and the specific section or sections of this Indenture 
in connection with which such Default or Event of Default has occurred.

          SECTION 11.08. WAIVER OF STAY OR EXTENSION.

          The Company covenants (to the extent that it may lawfully do so) 
that it will not at any time insist upon, or plead, or in any manner 
whatsoever claim, and will actively resist any and all efforts to be 
compelled to take the benefit or advantage of, any stay or extension law 
wherever enacted, now or at any time hereafter in force, which may affect the 
covenants or the performance of this Indenture; and (to the extent that it 
may lawfully do so) the Company hereby expressly waives all benefit or 
advantage of any such law and covenants that it will not hinder, delay or 
impede the execution of any power herein granted to the Trustee, but will 
suffer and permit the execution of every such power as though no such law had 
been enacted.

                                      -76-
<PAGE>

          SECTION 11.09. MONEY FOR SECURITIES PAYMENTS TO BE HELD IN TRUST.

          If the Company shall at any time act as its own Paying Agent with 
respect to any series of Securities, it will, on or before each due date of 
the principal of (and premium, if any) or interest on any of the Securities 
of that series, segregate and hold in trust for the benefit of the Persons 
entitled thereto a sum sufficient to pay the principal (and premium, if any) 
or interest so becoming due until such sums shall be paid to such Persons or 
otherwise disposed of as herein provided and will promptly notify the Trustee 
of its action or failure so to act.

          Whenever the Company shall have one or more Paying Agents for any 
series of Securities, it will, prior to each due date of the principal of 
(and premium, if any) or interest on any Securities of that series, deposit 
with a Paying Agent a sum sufficient to pay the principal (and premium, if 
any) or interest so becoming due, such sum to be held in trust for the 
benefit of the Persons entitled to such principal, premium or interest, and 
(unless such Paying Agent is the Trustee) the Company will promptly notify 
the Trustee of its action or failure to so act.

          The Company will cause each Paying Agent for any series of 
Securities (other than the Trustee) to execute and deliver to the Trustee an 
instrument in which such Paying Agent shall agree with the Trustee, subject 
to the provisions of this Section, that such Paying Agent will:

          (1) hold all sums held by it for the payment of the principal of 
     (and premium, if any) or interest on Securities of that series in trust 
     for the benefit of the Persons entitled thereto until such sums shall be 
     paid to such Persons or otherwise disposed of as herein provided;

          (2) give the Trustee notice of any default by the Company (or any 
     other obligor upon the Securities of that series) in the making of any 
     payment of principal And premium, if any) or interest on the Securities 
     of that series; and

          (3) at any time during the continuance of any such default, upon 
     the written request of the Trustee, forthwith pay to the Trustee all 
     sums so held in trust by such Paying Agent.

          The Company may at any time, for the purpose of obtaining the 
satisfaction and discharge of this Indenture or for any other purpose, pay, 
or by Company Order direct any Paying Agent to pay, to the Trustee all sums 
held in trust by the Company or such Paying Agent, such sums to be held by 
the Trustee upon the same trusts as those upon which such sums were held by 
the Company or such Paying Agent; and, upon such payment by any Paying Agent 
to the Trustee, such Paying Agent shall be released from all further 
liability with respect to such money.

          Any money deposited with the Trustee or any Paying Agent, or then 
held by the Company, in trust for the payment of the principal of (and 
premium, if any) or interest on any 

                                      -77-
<PAGE>

Security of any series and remaining unclaimed for two years after such 
principal (and premium, if any) or interest has become due and payable shall 
be paid to the Company on Company Request, or (if then held by the Company) 
shall be discharged from such trust; and the Holder of such Security shall 
thereafter, as an unsecured general creditor, look only to the Company for 
payment thereof, and all liability of the Trustee or such Paying Agent with 
respect to such trust money, and all liability of the Company as trustee 
thereof, shall thereupon cease; provided, however, that the Trustee or such 
Paying Agent, before being required to make any such repayment, may at the 
expense of the Company cause to be published once, in a newspaper published 
in the English language, customarily published on each Business Day and of 
general circulation in New York, New York, notice that such money remains 
unclaimed and that, after a date specified therein, which shall not be less 
than 30 days from the date of such publication, any unclaimed balance or such 
money then remaining will be repaid to the Company.

          SECTION 11.10. RESTRICTIONS ON LIENS.

          (a)  So long as any Securities are outstanding, the Company will 
not issue, assume, guarantee or permit to exist after the Release Date any 
Debt secured by any Lien on any Operating Property of the Company, whether 
owned at the date of this Indenture or thereafter acquired, without in any 
such case effectively securing the outstanding Securities (together with, if 
the Company shall so determine, any other Debt of or guaranteed by the 
Company ranking equally with, the Securities) equally and ratably with such 
Debt (but only so long as such Debt is so secured); PROVIDED, HOWEVER, that 
the foregoing restriction shall not apply to Debt secured by any of the 
following:

          (i)    Liens on any Operating Property existing at the time of 
     acquisition thereof (which Liens may also extend to subsequent repairs, 
     alterations and improvements to such Operating Property);

          (ii)   Liens on operating property of a corporation existing at the 
     time such corporation is merged into or consolidated with the Company, 
     or at the time of a sale, lease, or other disposition of the properties 
     of such corporation or a division thereof as an entirety or 
     substantially as an entirety to the Company;

          (iii)  Liens on Operating Property to secure all or part of the 
     cost of acquiring, constructing, developing, or substantially repairing, 
     altering, or improving such property, or to secure indebtedness incurred 
     to provide funds for any such purpose or for reimbursement of funds 
     previously expended for any such purpose, provided such Liens are 
     created or assumed contemporaneously with, or within eighteen (18) 
     months after, such acquisition or the completion of construction, 
     development, or substantial repair, alteration or improvement;

          (iv)   Liens in favor of any State, or any department, agency, or 
     instrumentality or political subdivision of any State, or for the 
     benefit of holders of securities issued by any such entity (or providers 
     of credit enhancement with respect to 

                                      -78-
<PAGE>

     such securities), to secure any Debt (including, without limitation, 
     obligations of the Company with respect to industrial development, 
     pollution control or similar revenue bonds) incurred for the purpose of 
     financing all or any part of the purchase price or the cost of 
     constructing, developing, or substantially repairing, altering, or 
     improving Operating Property of the Company;

          (v)    Any Lien created by any Substituted Mortgage Indenture 
     securing Substituted Collateral Bonds;

          (vi)   Any extension, renewal or replacement (or successive 
     extensions, renewals, or replacements), in whole or in part, of any Lien 
     referred to in the foregoing clauses (i) to (v), inclusive; PROVIDED, 
     HOWEVER, that the principal amount of Debt secured thereby and not 
     otherwise authorized by said clauses (i) to (v), inclusive, shall not 
     exceed the principal amount of Debt, plus any premium or fee payable in 
     connection with any such extension, renewal, or replacement, so secured 
     at the time of such extension, renewal, or replacement.

          (b)  Notwithstanding the provisions of Section 11.10(a), the 
Company may issue, assume, or guarantee Debt, or permit to exist after the 
Release Date any Debt, in each case, secured by Liens which would otherwise 
be subject to the restrictions of Section 11.10(a) up to an aggregate 
principal amount that, together with the principal amount of all other Debt 
of the Company secured by Liens (other than Liens permitted by Section 
11.10(a) that would otherwise be subject to any of the foregoing 
restrictions) and the Value of all Sale and Lease-Back Transactions in 
existence at such time (other than (i) any Sale and Lease-Back Transaction 
that, if such Sale and Lease-Back Transaction had been a Lien, would have 
been permitted by Section 11.10(a), (ii) Sale and Lease-Back Transactions 
permitted by Section 11.11 because the commitment by or on behalf of the 
purchaser was obtained no later than eighteen (18) months after the later of 
events described in (i) or (ii) of Section 11.11, and (iii) Sale and 
Lease-Back Transactions as to which application of amounts have been made in 
accordance with clause (z) of Section 11.11), does not at the time exceed the 
greater of ten percent (10%) of Net Tangible Assets or ten percent (10%) of 
Capitalization.

          (c)  If the Company shall issue, assume, or guarantee any Debt 
secured by any Lien and if Section 11.10(a) requires that the outstanding 
Securities be secured equally and ratably with such Debt, the Company will 
promptly execute, at its expense, any instruments necessary to so equally and 
ratably secure the outstanding Securities and deliver the same to the Trustee 
along with:

          (ii) An Officers' Certificate stating that the covenant of the 
     Company contained in Section 11.10(a) has been complied with; and

          (iii)     An Opinion of Counsel to the effect that the Company has 
     complied with the covenant contained in Section 11.10(a), and that any 
     instruments executed by the Company in the performance of such covenant 
     comply with the requirements of such covenant.

                                      -79-
<PAGE>


          In the event that the Company shall hereafter secure outstanding 
Securities equally and ratably with any other obligation or indebtedness 
pursuant to the provisions of this Section 11.10, the Company will, upon the 
request of the Trustee, enter into an indenture or agreement supplemental 
hereto and take such other action, if any, as the Trustee may reasonably 
request to enable it to enforce effectively the rights of the Holders of 
outstanding Securities so secured, equally and ratably with such other 
obligation or indebtedness.

          SECTION 11.11. RESTRICTIONS ON SALE AND LEASE-BACK TRANSACTIONS.  So
long as any Securities are outstanding, the Company will not enter into or 
permit to exist after the Release Date any Sale and Lease-Back Transaction 
with respect to any Operating Property if, in any case, the commitment by or 
on behalf of the purchaser is obtained more than eighteen (18) months after 
the later of (i) the completion of the acquisition, construction, or 
development of such Operating Property or (ii) the placing in operation of 
such Operating Property or of such Operating Property as constructed, 
developed, or substantially repaired, altered, or improved, unless (x) the 
Company would be entitled pursuant to Section 11.10(a) to issue, assume, 
guarantee or permit to exist Debt secured by a Lien on such Operating 
Property without equally and ratably securing the Securities or (y) the 
Company would be entitled pursuant to Section 11.10(b), after giving effect 
to such Sale and Lease-Back Transaction, to incur $1.00 of additional Debt 
secured by Liens (other than Liens permitted by Section 11.10(a)) or (z) the 
Company shall apply or cause to be applied, in the case of a sale or transfer 
for cash, an amount equal to the net proceeds thereof (but not in excess of 
the net book value of such Operating Property at the date of such sale or 
transfer) and, in the case of a sale or transfer otherwise than for cash, an 
amount equal to the fair value (as determined by the Board of Directors) of 
the Operating Property so leased, to the retirement, within one hundred 
eighty (180) days after the effective date of such Sale and Lease-Back 
Transaction, of Securities (in accordance with their terms) or other Debt of 
the Company ranking senior to, or equally with, the Securities; PROVIDED, 
HOWEVER, that the amount to be applied to such retirement of Debt shall be 
reduced by an amount equal to the principal amount, plus any premium or fee 
paid in connection with any redemption in accordance with the terms of Debt 
voluntarily retired by the Company within such one hundred eighty (180) day 
period, excluding retirement pursuant to mandatory sinking fund or prepayment 
provisions and payments at maturity.

                                      -80-
<PAGE>

                                       
                                  ARTICLE XII

                            REDEMPTION OF SECURITIES

          SECTION 12.01. APPLICABILITY OF ARTICLE.

          Securities of any series which are redeemable before their Stated 
Maturity shall be redeemable in accordance with their terms and (except as 
otherwise specified as contemplated by Section 3.01 for Securities of any 
series) in accordance with this Article.

          SECTION 12.02. ELECTION TO REDEEM; NOTICE TO TRUSTEE.

          The election of the Company to redeem any Securities shall be 
evidenced by a Board Resolution.  In case of any redemption at the election 
of the Company of less than all the Securities of any series, the Company 
shall, at least 45 days prior to the Redemption Date fixed by the Company 
(unless a shorter notice shall be satisfactory to the Trustee), notify the 
Trustee of such Redemption Date and of the principal amount of Securities of 
such series to be redeemed.  In the case of any redemption of Securities 
prior to the expiration of any restriction on such redemption provided in the 
terms of such Securities or elsewhere in this Indenture, the Company shall 
furnish the Trustee with an Officer's Certificate evidencing compliance with 
such restriction.

          SECTION 12.03. ELECTION BY TRUSTEE OF SECURITIES TO BE REDEEMED.

          If less than all the Securities of any series are to be redeemed, 
the particular Securities to be redeemed shall be selected not more than 90 
days prior to the Redemption Date by the Trustee, from the Outstanding 
Securities of such series not previously called for redemption, substantially 
pro rata, by lot or by any other method as the Trustee considers fair and 
appropriate and that complies with the requirements of the principal national 
securities exchange, if any, on which such Securities are listed, and which 
may provide for the selection for redemption of portions (equal to the 
minimum authorized denomination for Securities of that series or any integral 
multiple thereof) of the principal amount of Securities of such series of a 
denomination larger than the minimum authorized denomination for Securities 
of that series; provided that in case the Securities of such series have 
different terms and maturities, the Securities to be redeemed shall be 
selected by the Company and the Company shall give notice thereof to the 
Trustee.

          The Trustee shall promptly notify the Company in writing of the 
Securities selected for redemption and, in the case of any Securities 
selected for partial redemption, the principal amount thereof to be redeemed.

          For all purposes of this Indenture, unless the context otherwise 
requires, all provisions relating to the redemption of the Securities shall 
relate, in the case of any Securities redeemed or to be redeemed only in 
part, to the portion of the principal amount of such Securities which has 
been or is to be redeemed.

                                      -81-
<PAGE>

          SECTION 12.04. NOTICE OF REDEMPTION.

          Notice of redemption shall be given by first-class mail, postage 
prepaid, mailed not less than 30 nor more than 45 days prior to the 
Redemption Date, unless otherwise provided in an indenture supplemental 
hereto, to each Holder of Securities to be redeemed, at his address appearing 
in the Security Register.

          All notices of redemption shall state:

          (1) the Redemption Date;

          (2) the Redemption Price;

          (3) if less than all the Outstanding Securities of any series are 
     to be redeemed, the identification (and, in the case of partial 
     redemption, the principal amounts) of the particular Securities to be 
     redeemed;

          (4) that on the Redemption Date the Redemption Price will become 
     due and payable upon each such Security to be redeemed and, if 
     applicable, that interest thereon will cease to accrue on and after said 
     date;

          (5) the place or places where such Securities are to be surrendered 
     for payment of the Redemption Price;

          (6) that the redemption is for a sinking fund, if such is the case;

          (7) the CUSIP number, if any, of the Securities to be redeemed; and

          (8) unless otherwise provided as to a particular series of 
     Securities, if at the time of publication or mailing of any notice of 
     redemption the Company shall not have deposited with the Trustee or 
     Paying Agent and/or irrevocably directed the Trustee or Paying Agent to 
     apply, from money held by it available to be used for the redemption of 
     Securities, an amount in cash sufficient to redeem all of the Securities 
     called for redemption, including accrued interest to the Redemption 
     Date, such notice shall state that it is subject to the receipt of the 
     redemption moneys by the Trustee or Paying Agent before the Redemption 
     Date (unless such redemption is mandatory) and such notice shall be of 
     no effect unless such moneys are so received before such date.

          Notice of redemption of Securities to be redeemed at the election of
the Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company.

          SECTION 12.05. DEPOSIT OF REDEMPTION PRICE.

          Prior to any Redemption Date, the Company shall deposit with the
Trustee or with a Paying Agent (or, if the Company is acting as its own Paying
Agent, segregate and hold in trust as provided in Section 11.08) an amount of
money sufficient to pay the Redemption 

                                       -82-
<PAGE>

Price of, and (except if the Redemption Date shall be an Interest Payment 
Date) accrued interest on, all the Securities which are to be redeemed on 
that date.

          SECTION 12.06. SECURITIES PAYABLE ON REDEMPTION DATE.

          Notice of redemption having been given as aforesaid, the Securities 
so to be redeemed shall, on the Redemption Date, become due and payable at 
the Redemption Price therein specified, and from and after such date (unless 
the Company shall default in the payment of the Redemption Price and accrued 
interest) such Securities shall cease to bear interest.  Upon surrender of 
any such Security for redemption in accordance with said notice, such 
Security shall be paid by the Company at the Redemption Price, together with 
accrued interest to the Redemption Date; provided, however, that installments 
of interest whose Stated Maturity is on or prior to the Redemption Date shall 
be payable to the Holders of such Securities, or one or more Predecessor 
Securities, registered as such at the close of business on the relevant 
Regular or Special Record Dates according to their terms and the provisions 
of Section 3.07.

          If any Security called for redemption shall not be so paid upon 
surrender thereof for redemption, the principal (and premium, if any) shall, 
until paid, bear interest from the Redemption Date at the rate prescribed 
therefor in the Security.

          SECTION 12.07. SECURITIES REDEEMED IN PART.

          Any Security which is to be redeemed only in part shall be 
surrendered at an office or agency of the Company at a Place of Payment 
therefor (with, if the Company or the Trustee so requires, due endorsement 
by, or a written instrument of transfer in form satisfactory to the Company 
and the Trustee duly executed by, the Holder thereof or his attorney duly 
authorized in writing), and the Company shall execute, and the Trustee shall 
authenticate and deliver to the Holder of such Security without service 
charge, a new Security or Securities of the same series and Stated Maturity, 
of any authorized denomination as requested by such Holder, in aggregate 
principal amount equal to and in exchange for the unredeemed portion of the 
principal of the Security so surrendered.

                                      -83-
<PAGE>

                                  ARTICLE XIII

                                 SINKING FUNDS

          SECTION 13.01. APPLICABILITY OF ARTICLE.

          The provisions of this Article shall be applicable to any sinking 
fund for the retirement of Securities of a series, except as otherwise 
specified as contemplated by Section 3.01 for Securities of such series.

          The minimum amount of any sinking fund payment provided for by the 
terms of Securities of any series is herein referred to as a "MANDATORY 
SINKING FUND PAYMENT," and any payment in excess of such minimum amount 
provided for by the terms of Securities of any series is herein referred to 
as an "OPTIONAL SINKING FUND PAYMENT."  If provided for by the terms of 
Securities of any series, the cash amount of any sinking fund payment may be 
subject to reduction as provided in Section 13.02.  Each sinking fund payment 
shall be applied to the redemption of Securities of any series as provided 
for by the terms of Securities of such series.

          SECTION 13.02. SATISFACTION OF SINKING FUND PAYMENTS WITH 
                         SECURITIES.

          The Company (1) may deliver Securities of a series (other than any 
Securities previously called for redemption) and (2) may apply as a credit 
Securities of a series which have been redeemed either at the election of the 
Company pursuant to the terms of such Securities or through the application 
of permitted optional sinking fund payments pursuant to the terms of such 
Securities, in each case in satisfaction of all or any part of any sinking 
fund payment with respect to the Securities of such series required to be 
made pursuant to the terms of such Securities as provided for by the terms of 
such series; provided that such Securities have not been previously so 
credited. Such Securities shall be received and credited for such purpose by 
the Trustee at the Redemption Price specified in such Securities for 
redemption through operation of the sinking fund and the amount of such 
sinking fund payment shall be reduced accordingly.

          SECTION 13.03. REDEMPTION OF SECURITIES FOR SINKING FUND.

          Not less than 45 days prior to each sinking fund payment date for 
any series of Securities, the Company will deliver to the Trustee an 
Officer's Certificate specifying the amount of the next ensuing sinking fund 
payment for that series pursuant to the terms of that series, the portion 
thereof, if any, which is to be satisfied by payment of cash and the portion 
thereof, if any, which is to be satisfied by delivering and crediting 
Securities of that series pursuant to Section 13.02 and will also deliver to 
the Trustee any Securities to be so delivered.  Not less than 30 days before 
each such sinking fund payment date the Trustee shall select the Securities 
to be redeemed upon such sinking fund payment date in the manner specified in 
Section 12.03 and cause notice of the redemption thereof to be given in the 
name of and at the expense of the Company in the manner provided in Section 
12.04.  Such notice having been 

                                      -84-
<PAGE>

duly given, the redemption of such Securities shall be made upon the terms 
and in the manner stated in Sections 12.06 and 12.07.

                                       
                                  ARTICLE XIV

                       DEFEASANCE AND COVENANT DEFEASANCE

          SECTION 14.01. APPLICABILITY OF ARTICLE; COMPANY'S OPTION TO EFFECT
                         DEFEASANCE OR COVENANT DEFEASANCE.

          Unless pursuant to Section 3.01 provision is made for the 
inapplicability of either or both of (a) Defeasance of the Securities of a 
series under Section 14.02 or (b) Covenant Defeasance of the Securities of a 
series under Section 14.03, then the provisions of such Section or Sections, 
as the case may be, together with the other provisions of this Article, shall 
be applicable to the Securities of such series, and the Company may at its 
option by Board Resolution, at any time, with respect to the Securities of 
such series, elect to have either Section 14.02 (unless inapplicable) or 
Section 14.03 (unless inapplicable) be applied to the Outstanding Securities 
of such series upon compliance with the applicable conditions set forth below 
in this Article.

          SECTION 14.02. DEFEASANCE AND DISCHARGE.

          Upon the Company's exercise of the option provided in Section 14.01 
to defease the Outstanding Securities of a particular series, the Company 
shall be discharged from its obligations with respect to the Outstanding 
Securities of such series on the date the applicable conditions set forth in 
Section 14.04 are satisfied (hereinafter, "DEFEASANCE").  Defeasance shall 
mean that the Company shall be deemed to have paid and discharged the entire 
indebtedness represented by the Outstanding Securities of such series and to 
have satisfied all its other obligations under such Securities and this 
Indenture insofar as such Securities are concerned (and the Trustee, at the 
expense of the Company, shall execute proper instruments acknowledging the 
same); provided, however, that the following rights, obligations, powers, 
trusts, duties and immunities shall survive until otherwise terminated or 
discharged hereunder:  (A) the rights of Holders of Outstanding Securities of 
such series to receive, solely from the trust fund provided for in Section 
14.04, payments in respect of the principal of (and premium, if any) and 
interest on such Securities when such payments are due, (B) the Company's 
obligations with respect to such Securities under Sections 3.04, 3.05, 3.06, 
11.02 and 11.09, (C) the rights, powers, trusts, duties and immunities of the 
Trustee hereunder and (D) this Article.  Subject to compliance with this 
Article, the Company may exercise its option with respect to Defeasance under 
this Section 14.02 notwithstanding the prior exercise of its option with 
respect to Covenant Defeasance under Section 14.03 in regard to the 
Securities of such series.

          SECTION 14.03. COVENANT DEFEASANCE.

          Upon the Company's exercise of the option provided in Section 14.01 to
obtain a Covenant Defeasance with respect to the Outstanding Securities of a
particular series, the 

                                      -85-
<PAGE>

Company shall be released from its obligations under this Indenture (except 
its obligations under Sections 3.04, 3.05, 3.06, 6.06, 6.09, 7.10, 11.01, 
11.02, 11.06, 11.08 and 11.09) with respect to the Outstanding Securities of 
such series on and after the date the applicable conditions set forth in 
Section 14.04 are satisfied (hereinafter, "COVENANT DEFEASANCE"). Covenant 
Defeasance shall mean that, with respect to the Outstanding Securities of 
such series, the Company may omit to comply with and shall have no liability 
in respect of any term, condition or limitation set forth in this Indenture 
(except its obligations under Sections 3.04, 3.05, 3.06, 6.06, 6.09, 7.10, 
11.01, 11.02, 11.06, 11.08 and 11.09), whether directly or indirectly by 
reason of any reference elsewhere herein or by reason of any reference to any 
other provision herein or in any other document, and such omission to comply 
shall not constitute an Event of Default under Section 6.01(3) with respect 
to Outstanding Securities of such series, and the remainder of this Indenture 
and of the Securities of such series shall be unaffected thereby.

          SECTION 14.04. CONDITIONS TO DEFEASANCE OR COVENANT DEFEASANCE.

          The following shall be the conditions to Defeasance under Section 
14.02 and Covenant Defeasance under Section 14.03 with respect to the 
Outstanding Securities of a particular series:

          (1) The Company shall irrevocably have deposited or caused to be 
     deposited with the Trustee (or another trustee satisfying the 
     requirements of Section 7.09 who shall agree to comply with the 
     provisions of this Article applicable to it), under the terms of an 
     irrevocable trust agreement in form and substance reasonably 
     satisfactory to such Trustee, as trust funds in trust for the purpose of 
     making the following payments, specifically pledged as security for, and 
     dedicated solely to, the benefit of the Holders of such Securities, (A) 
     Dollars in an amount, or (B) U.S. Government Obligations which through 
     the scheduled payment of principal and interest in respect thereof in 
     accordance with their terms will provide, not later than the due date of 
     any payment, money in an amount, or (C) a combination thereof, in each 
     case sufficient, after payment of all federal, state and local taxes or 
     other charges or assessments in respect thereof payable by the Trustee, 
     in the opinion of a nationally recognized firm of independent public 
     accountants expressed in a written certification thereof delivered to 
     the Trustee, to pay and discharge, and which shall be applied by the 
     Trustee (or other qualifying trustee) to pay and discharge, (i) the 
     principal of (and premium, if any, on) and each installment of principal 
     of (and premium, if any) and interest on the Outstanding Securities of 
     such series on the Stated Maturity of such principal or installment of 
     principal or interest and (ii) any mandatory sinking fund payments or 
     analogous payments applicable to the Outstanding Securities of such 
     series on the day on which such payments are due and payable in 
     accordance with the terms of this Indenture and of such Securities.

          (2) No Default or Event of Default with respect to the Securities 
     of such series shall have occurred and be continuing on the date of such 
     deposit or shall occur as a result of such deposit, and no Default or 
     Event of Default under clause (6) or (7) 

                                      -86-
<PAGE>

 
     of Section 6.01 shall occur and be continuing, at any time during the 
     period ending on the 91st day after the date of such deposit (it being 
     understood that this condition shall not be deemed satisfied until the 
     expiration of such period).

          (3) Such deposit, Defeasance or Covenant Defeasance shall not 
     result in a breach or violation of, or constitute a default under, any 
     other agreement or instrument to which the Company is a party or by 
     which it is bound.

          (4) Such Defeasance or Covenant Defeasance shall not cause any 
     Securities of such series then listed on any national securities 
     exchange registered under the Exchange Act to be delisted.

          (5) In the case of an election with respect to Section 14.02, the 
     Company shall have delivered to the Trustee either (A) a ruling directed 
     to the Trustee received from the Internal Revenue Service to the effect 
     that the Holders of the Outstanding Securities of such series will not 
     recognize income, gain or loss for federal income tax purposes as a 
     result of such Defeasance and will be subject to federal income tax on 
     the same amounts, in the same manner and at the same times as would have 
     been the case if such Defeasance had not occurred or (B) an Opinion of 
     Counsel, based on such ruling or on a change in the applicable federal 
     income tax law since the date of this Indenture, in either case to the 
     effect that, and based thereon such opinion shall confirm that, the 
     Holders of the Outstanding Securities of such series will not recognize 
     income, gain or loss for federal income tax purposes as a result of such 
     Defeasance and will be subject to federal income tax on the same 
     amounts, in the same manner and at the same times as would have been the 
     case if such Defeasance had not occurred.

          (6) In the case of an election with respect to Section 14.03, the 
     Company shall have delivered to the Trustee an Opinion of Counsel or a 
     ruling directed to the Trustee received from the Internal Revenue 
     Service to the effect that the Holders of the Outstanding Securities of 
     such series will not recognize income, gain or loss for federal income 
     tax purposes as a result of such Covenant Defeasance and will be subject 
     to federal income tax on the same amounts, in the same manner and at the 
     same times as would have been the case if such Covenant Defeasance had 
     not occurred.

          (7) Such Defeasance or Covenant Defeasance shall be effected in 
     compliance with any additional terms, conditions or limitations which 
     may be imposed on the Company in connection therewith pursuant to 
     Section 3.01.

          (8) The Company shall have delivered to the Trustee an Officer's 
     Certificate and an Opinion of Counsel, each stating that all conditions 
     precedent provided for relating to either the Defeasance under Section 
     14.02 or the Covenant Defeasance under Section 14.03 (as the case may 
     be) have been complied with.

                                      -87-
<PAGE>

          SECTION 14.05. DEPOSITED MONEY AND GOVERNMENT OBLIGATIONS TO BE 
                         HELD IN TRUST.

          Subject to the provisions of the last paragraph of Section 11.08, 
all money and Government Obligations (including the proceeds thereof) 
deposited with the Trustee (or other qualifying trustee--collectively for 
purposes of this Section 14.05, the "Trustee") pursuant to Section 14.04 in 
respect of the Outstanding Securities of a particular series shall be held in 
trust and applied by the Trustee, in accordance with the provisions of such 
Securities and this Indenture, to the payment, either directly or through any 
Paying Agent (including the Company acting as its own Paying Agent) as the 
Trustee may determine, to the Holders of such Securities of all sums due and 
to become due thereon in respect of principal (and premium, if any) and 
interest, but such money need not be segregated from other funds except to 
the extent required by law.

          The Company shall pay and indemnify the Trustee against any tax, 
fee or other charge imposed on or assessed against the Government Obligations 
deposited pursuant to Section 14.04 or the principal and interest received in 
respect thereof, other than any such tax, fee or other charge which by law is 
for the account of the Holders of the Outstanding Securities of such series.

          Anything in this Article to the contrary notwithstanding, the 
Trustee shall deliver to pay to the Company from time to time upon company 
Request any money or Government Obligations held by it as provided in Section 
14.04 which, in the opinion of a nationally recognized firm of independent 
public accountants expressed in a written certification thereof delivered to 
the Trustee, are in excess of the amount thereof which would then be required 
to be deposited for the purpose for which such money or Government 
Obligations were deposited.

                                      -88-
<PAGE>

                                   ARTICLE XV

                                 MISCELLANEOUS

          SECTION 15.01. MISCELLANEOUS.

          This instrument may be executed in any number of counterparts, each 
of which so executed shall be deemed to be an original, but all such 
counterparts shall together constitute but one and the same instrument.

          IN WITNESS WHEREOF, the parties hereto have caused this Indenture 
to be duly executed, and their respective corporate seals to be hereunto 
affixed and attested, all as of the day and year first above written.

                                   WISCONSIN PUBLIC SERVICE CORPORATION





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

Attest:

/s/ Francis J. Kicsar
- -------------------------------------
Name:     Francis J. Kicsar
Title:    Secretary

                                   FIRSTAR BANK MILWAUKEE, NATIONAL ASSOCIATION,
                                   as Trustee





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

Attest:

/s/ Yvonne Siira
- -------------------------------------
Name:     Yvonne Siira


                                       -89-
<PAGE>

Title:    Assistant Secretary


                                       -90-

<PAGE>

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

                            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


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

<PAGE>


          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
<PAGE>

                                     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
<PAGE>

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
<PAGE>

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
<PAGE>

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
<PAGE>

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
<PAGE>

          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
<PAGE>

                                                                     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
<PAGE>
                                       
                     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
<PAGE>

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
<PAGE>

                  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
<PAGE>

          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
<PAGE>

          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
<PAGE>

                                 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
<PAGE>

                                                                    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
<PAGE>

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
<PAGE>
                                       
                        (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
<PAGE>

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
<PAGE>

          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


<PAGE>
                                                                             4D
                                  THIRTY-THIRD
                                       

                             SUPPLEMENTAL INDENTURE


                                      FROM




                            WISCONSIN PUBLIC SERVICE
                                  CORPORATION



                                       TO




               FIRSTAR BANK MILWAUKEE, N.A., NATIONAL ASSOCIATION
                      (SUCCESSOR TO FIRSTAR TRUST COMPANY,
                FORMERLY KNOWN AS FIRST WISCONSIN TRUST COMPANY)
                                    TRUSTEE


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


                          DATED AS OF DECEMBER 1, 1998


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


                                  SUPPLEMENTAL
                                       TO
                        FIRST MORTGAGE AND DEED OF TRUST
                          DATED AS OF JANUARY 1, 1941

                                       
<PAGE>

                       WISCONSIN PUBLIC SERVICE CORPORATION
                       THIRTY-THIRD SUPPLEMENTAL INDENTURE

                           Dated as of December 1, 1998

                                TABLE OF CONTENTS

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

<TABLE>
<CAPTION>
                                                                                 PAGE
                                                                                 ----
<S>                                                                              <C>
     Parties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
     Recitals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
     Form of Bond of Collateral Series A . . . . . . . . . . . . . . . . . . . . .  3
     Form of Trustee's Certificate . . . . . . . . . . . . . . . . . . . . . . . .  5
     Form of Prepayment Record . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     Further Recitals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8

                                     ARTICLE I
                      FORM OF EXECUTION OF BONDS OF NEW SERIES

     Sec. 1.01      Terms of bonds of new series . . . . . . . . . . . . . . . . .   9
     Sec. 1.02      Limitation of new series to $50,000,000. . . . . . . . . . . .   9
     Sec. 1.03      Optional redemption of bonds of new series by Company. . . . .   9
     Sec. 1.04      Notice of, and selection of bonds of new series for,
                    redemption . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     Sec. 1.05      Redemption in event of default under section 6.01 of the
                    Senior Indenture . . . . . . . . . . . . . . . . . . . . . . .  11
     Sec. 1.06      Partial redemption and payments of redemption price without
                    presentation of bonds and new series . . . . . . . . . . . . .  11
     Sec. 1.07      Company not obligated to make any transfer of bonds of new
                    series for fifteen days before any interest payment date . . .  12
     Sec. 1.08      Charges for transfer of bonds of new series. . . . . . . . . .  12
     Sec. 1.09      Bonds of new series may be signed by facsimile signatures of
                    Company officers . . . . . . . . . . . . . . . . . . . . . . .  12
     Sec. 1.10      Payment dates falling on Saturday, Sunday or legal
                    holiday. . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     Sec. 1.11      Bonds of new series redeemed or paid not reissuable, but may
                    be basis for issuance of bonds of different series,
                    credits or cash withdrawals. . . . . . . . . . . . . . . . . .  12

                                     ARTICLE II
                                CONFIRMATION OF LIEN

     Sec. 2.01      Granting clauses and habendum. . . . . . . . . . . . . . . . .  12

                                       i
<PAGE>


                                   ARTICLE III
                       PARTICULAR COVENANTS OF THE COMPANY

     Sec. 3.01      Duly authorized by law to execute and deliver Supplemental
                    Indenture and issue bonds. . . . . . . . . . . . . . . . . . .  13
     Sec. 3.02      Covenant of lawful possession, right to mortgage
                    property and to maintain lien of Indenture.. . . . . . . . . .  13
     Sec. 3.03      Payment of principal and interest. . . . . . . . . . . . . . .  13
     Sec. 3.04      Nonliability of Trustee. . . . . . . . . . . . . . . . . . . .  14

                                     ARTICLE IV
                                   MISCELLANEOUS

     Sec. 4.01      Recitals not made by Trustee.  No representations made by
                    Trustee.  Trust accepted subject to terms and conditions of
                    Indenture. . . . . . . . . . . . . . . . . . . . . . . . . . .  14
     Sec. 4.02      Supplemental Indenture to be construed as part of Indenture. .  14
     Sec. 4.03(a)   References to either party to Supplemental Indenture
                    includes successors or assigns . . . . . . . . . . . . . . . .  14
              (b)   Table of contents and descriptive headings of articles not
                    to affect meaning. . . . . . . . . . . . . . . . . . . . . . .  14
     Sec. 4.04(a)   Trust Indenture Act requirements control . . . . . . . . . . .  14
              (b)   Severability of Supplemental Indenture provisions and
                    bond provisions. . . . . . . . . . . . . . . . . . . . . . . .  14
     Sec. 4.05      Provisions for execution in counterparts . . . . . . . . . . .  15
     Sec. 4.06      Supplemental Indenture effective on execution and
                    delivery . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
     Sec. 4.07      Names and addresses of debtor and secured party. . . . . . . .  15
</TABLE>

                                       ii
<PAGE>


          THIRTY-THIRD SUPPLEMENTAL INDENTURE, made as of the 1st day of 
December, 1998, by and between WISCONSIN PUBLIC SERVICE CORPORATION, a 
corporation duly organized and existing under and by virtue of the laws of 
the State of Wisconsin, having its principal office in the City of Green Bay 
in said State (hereinafter sometimes called the "Company"), party of the 
first part, and FIRSTAR BANK MILWAUKEE, N.A., NATIONAL ASSOCIATION (successor 
to Firstar Trust Company, formerly known as First Wisconsin Trust Company), a 
national banking association duly organized and existing under and by virtue 
of the laws of the United States, having its principal office in the City of 
Milwaukee in the State of Wisconsin, as Trustee (hereinafter sometimes called 
the "Trustee"), party of the second part.

          WHEREAS, the Company has heretofore executed and delivered to the 
predecessor of the Trustee its First Mortgage and Deed of Trust made as of 
January 1, 1941 (hereinafter referred to as the "1941 Mortgage") and has 
heretofore executed and delivered to the predecessor of the Trustee 
supplemental indentures dated and hereinafter referred to as follows:

<TABLE>
<CAPTION>
        SUPPLEMENTAL INDENTURE               
             DATED (AS OF)                    HEREINAFTER REFERRED TO AS
        ----------------------                --------------------------
<S>                                    <C>
 November 1, 1947 . . . . . . . . . .  First Supplemental Indenture*
 August 1, 1948 . . . . . . . . . . .  Second Supplemental Indenture
 September 1, 1949. . . . . . . . . .  Third Supplemental Indenture
 November 1, 1950 . . . . . . . . . .  Fourth Supplemental Indenture*
 May 1, 1953. . . . . . . . . . . . .  Fifth Supplemental Indenture*
 January 1, 1954. . . . . . . . . . .  Sixth Supplemental Indenture
 October 1, 1954. . . . . . . . . . .  Seventh Supplemental Indenture
 December 1, 1957 . . . . . . . . . .  Eighth Supplemental Indenture
 November 1, 1959 . . . . . . . . . .  Ninth Supplemental Indenture
 October 1, 1963. . . . . . . . . . .  Tenth Supplemental Indenture
 June 1, 1964 . . . . . . . . . . . .  Eleventh Supplemental Indenture
 November 1, 1967 . . . . . . . . . .  Twelfth Supplemental Indenture
 April 1, 1969. . . . . . . . . . . .  Thirteenth Supplemental Indenture
 August 1, 1970 . . . . . . . . . . .  Fourteenth Supplemental Indenture
 May 1, 1971. . . . . . . . . . . . .  Fifteenth Supplemental Indenture
 August 1, 1973 . . . . . . . . . . .  Sixteenth Supplemental Indenture*
 September 1, 1973. . . . . . . . . .  Seventeenth Supplemental Indenture
 October 1, 1975. . . . . . . . . . .  Eighteenth Supplemental Indenture
 February 1, 1977 . . . . . . . . . .  Nineteenth Supplemental Indenture
 July 15, 1980. . . . . . . . . . . .  Twentieth Supplemental Indenture
 December 1, 1980 . . . . . . . . . .  Twenty-First Supplemental Indenture*
 April 1, 1981. . . . . . . . . . . .  Twenty-Second Supplemental Indenture
 February 1, 1984 . . . . . . . . . .  Twenty-Third Supplemental Indenture
 March 15, 1984 . . . . . . . . . . .  Twenty-Fourth Supplemental Indenture
 October 1, 1985. . . . . . . . . . .  Twenty-Fifth Supplemental Indenture

                                       
<PAGE>
<CAPTION>
        SUPPLEMENTAL INDENTURE               
             DATED (AS OF)                    HEREINAFTER REFERRED TO AS
        ----------------------                --------------------------
<S>                                    <C>
 December 1, 1987 . . . . . . . . . .  Twenty-Sixth Supplemental Indenture*
 September 1, 1991. . . . . . . . . .  Twenty-Seventh Supplemental Indenture
 July 1, 1992 . . . . . . . . . . . .  Twenty-Eighth Supplemental Indenture
 October 1, 1992. . . . . . . . . . .  Twenty-Ninth Supplemental Indenture
 February 1, 1993 . . . . . . . . . .  Thirtieth Supplemental Indenture
 July 1, 1993 . . . . . . . . . . . .  Thirty-First Supplemental Indenture
 November 1, 1993 . . . . . . . . . .  Thirty-Second Supplemental Indenture
</TABLE>


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

*Includes amendments to or modifications of certain provisions of the 1941
Mortgage.

(said 1941 Mortgage, as supplemented, amended or modified by the aforesaid 
Supplemental Indentures, being hereinafter referred to as the "Indenture", 
except as such term is differently defined and used in and for the purposes 
of the Form of Bond of Collateral Series A and the Form of Trustee's 
Certificate hereinafter set forth), whereby the Company granted, bargained, 
sold, warranted, released, conveyed, assigned, transferred, mortgaged, 
pledged, set over and confirmed unto the Trustee, and to its respective 
successors in trust, upon the terms, conditions and trusts therein set forth, 
all the property as therein described, real, personal and mixed, then owned 
or thereafter acquired by the Company, with certain exceptions as in the 
granting clauses and definitions of the Indenture set forth, to be held by 
the Trustee in trust, under the terms and subject to the conditions of the 
Indenture, as security for the bonds of the Company issued and to be issued 
thereunder in accordance with the provisions of the Indenture; and

          WHEREAS, Section 2.01 of the 1941 Mortgage provides that bonds may 
be issued thereunder in one or more series, each series to have such 
distinctive designation as the Board of Directors of the Company may select 
for such series; and

          WHEREAS, the Company has heretofore issued and there are now 
outstanding, in accordance with the provisions of the 1941 Mortgage and said 
Supplemental Indentures bonds of several series designated "First Mortgage 
Bonds, 8.80% Series due September 1, 2021", "First Mortgage Bonds, 6c% Series 
due October 1, 2005", "First Mortgage Bonds, 7.30% Series due October 1, 
2002", "First Mortgage Bonds, 6.80% Series due February 1, 2003", "First 
Mortgage Bonds, 7c% Series Due July 1, 2023" and First Mortgage Bonds Due 
February 1, 2013; and

          WHEREAS, the Company has agreed to issue $50,000,000 in aggregate 
principal amount of Senior Notes, 6.08% Series Due December 1, 2028 (the 
"Related Securities") pursuant to an Indenture, dated as of December 1, 1998, 
between the Company and Firstar Bank Milwaukee, N.A., as trustee (the "Senior 
Trustee"); and

          WHEREAS, in order to secure the Company's obligations to pay 
principal, premium, if any, and interest on the Related Securities, the 
Company is desirous of providing 

                                       2
<PAGE>

for the issuance under the Indenture of bonds of a new series designated as 
"First Mortgage Bonds, Collateral Series A", in an aggregate principal amount 
of not more than $50,000,000, the bonds of said series to be issued as 
registered bonds without coupons in any denominations that the Company may 
from time to time execute and deliver, the bonds of said series, the 
Trustee's Certificate, and the Form of Prepayment Record to be substantially 
in the tenor following:
                                       
                    (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
No._____________                                            $___________

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 
SECURITIES.

          WISCONSIN PUBLIC SERVICE CORPORATION, a corporation organized and 
existing under the laws of the State of Wisconsin (hereinafter called the 
Company), for value received, hereby promises to pay to FIRSTAR BANK 
MILWAUKEE, N.A., NATIONAL 

                                       3
<PAGE>


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

                                       4
<PAGE>

                        (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, 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) 

                                       5
<PAGE>

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.

                                       6
<PAGE>

          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)

                                       7
<PAGE>

                                       
                         (Form of Prepayment Record)

                               PREPAYMENT RECORD

                     PRINCIPAL AMOUNT OF BOND $__________

                     DATE OF MATURITY:  December 1, 2028

<TABLE>
<CAPTION>
        PREPAYMENTS ON PRINCIPAL
        ------------------------
                                            BALANCE          SIGNATURE OF  AUTHORIZED
       AMOUNT               DATE          OUTSTANDING           OFFICER AND TITLE
       ------               ----          -----------           -----------------
<S>                         <C>           <C>                <C>



</TABLE>

and

          WHEREAS, the 1941 Mortgage provides that the Company and the 
Trustee may enter into indentures supplemental thereto for the purposes, 
among others, of providing the terms and conditions of the issue of the bonds 
of any new series; and

          WHEREAS, the Company is presently engaged within the States of 
Wisconsin and Michigan in transmitting, conveying, distributing, supplying 
and serving electricity and gas and intends that this Supplemental Indenture 
shall be received for record and for filing in the appropriate public offices 
of said States or of any other jurisdiction in which there may be located 
from time to time properties intended to be subject to the lien of the 
Indenture in the manner and with the effect provided by their respective laws 
in respect to mortgages by, and security interests in existing and hereafter 
acquired properties of, a corporation so engaged; and

          WHEREAS, the execution and delivery of this Supplemental Indenture 
and the issue of bonds as in this Supplemental Indenture and the Indenture 
provided have been duly authorized by a resolution adopted by the Board of 
Directors of the Company; and

          WHEREAS, all things necessary to make the bonds of Collateral 
Series A, when duly issued and executed by the Company, and authenticated and 
delivered by the Trustee, valid, binding and legal obligations of the 
Company, and to make the Indenture and this Supplemental Indenture valid, 
binding and legal instruments for the security thereof, have been done and 
performed and the issue of said bonds, as in this Supplemental Indenture and 
the Indenture provided, has been in all respects duly authorized;

     NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH:  Wisconsin 
Public Service Corporation, in consideration of the premises and of one 
dollar to it duly paid by the Trustee at or before the ensealing and delivery 
of these presents, the receipt whereof is hereby acknowledged, does hereby 
covenant and agree to and with Firstar Bank Milwaukee, National Association, 
as Trustee, as follows:

                                       8
<PAGE>
                                   ARTICLE I.

                     FORM AND EXECUTION OF BONDS OF NEW SERIES

          SECTION 1.01.       There is hereby created, for issuance under the 
Indenture on the date of authentication and delivery of the Related 
Securities, a series of bonds designated as Collateral Series A (herein 
sometimes referred to as the bonds of Collateral Series A), each of which 
shall bear the descriptive title "First Mortgage Bond, Collateral Series A".  
The bonds of said series shall be issued only in the form of registered bonds 
without coupons and shall be substantially of the tenor and purport, and in 
the form, hereinbefore recited.  The bonds of said series shall mature on 
December 1, 2028, and shall be issued in any denominations that the Company 
may execute and deliver.  The bonds of said series shall bear interest at the 
rate of six and eight hundredths percent (6.08%) per annum, payable 
semiannually on June 1 and December 1 of each year commencing June 1, 1999.  
Bonds of said series issued prior to June 1, 1999 shall be dated as of 
December 1, 1998 and bonds of said series issued on and after June 1, 1999 
shall be dated as provided in Section 2.09 of the 1941 Mortgage.  Principal 
and interest will be payable to the registered owner of the bonds of said 
series, and at the address thereof, appearing on the Company's books for 
registration and registration of transfer.  Said bonds will be 
nontransferable except to the Senior Trustee and successors thereto, if any.

          SECTION 1.02.       The aggregate principal amount of all bonds of 
Collateral Series A which may at any time be certified, issued and 
outstanding shall be limited to $50,000,000, and bonds of said series may be 
executed, authenticated, delivered and issued hereunder from time to time 
subject to the restrictions and provisions contained in this Supplemental 
Indenture and in the 1941 Mortgage.

          SECTION 1.03.       The bonds of Collateral Series A 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, at a redemption price equal to the greater 
of (i) 100% of their principal amount or (ii) the sum of the present values 
of the remaining scheduled payments of principal and interest thereon 
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 
hereinafter defined) plus two-tenths of one percent (.20%), plus in each case 
accrued interest to the date of redemption.  The redemption price shall be 
set forth in an Officers' Certificate delivered to the Trustee on or before 
the redemption date.

          "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 bonds of Collateral Series A that 
would be utilized, at the time of 

                                       9
<PAGE>

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 bonds of Collateral Series A.  "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 Referenced 
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 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 or Dealers selected by the Company.

          SECTION 1.04.       In the event that the Company shall desire to 
exercise its right to redeem and pay all or any part of the bonds of 
Collateral Series A pursuant to Section 1.03, it shall, except as modified 
herein, comply with the terms and conditions of Article XI of the Indenture 
with regard to the redemption of bonds of any series secured thereby, and 
such redemption shall be made under and subject to the terms and provisions 
of said Article XI and in the manner and with the effect stated therein; 
provided, however, (a) the Company shall specify, in accordance with the 
provisions of this Supplemental Indenture, those bonds of Collateral Series A 
which are to be redeemed if only a part thereof are to be redeemed, and 
payments in redemption of bonds of Collateral Series A shall be made directly 
by the Company to the registered owners of the bonds entitled thereto; and 
(b) the provisions of Section 11.03(b) of the 1941 Mortgage shall not be 
applicable to any such redemption.  The Company shall not exercise any option 
to redeem on any date all or any part of the bonds of Collateral Series A 
unless it shall give a valid direction under the Senior Indenture for the 
redemption on such date of an equal amount of Related Securities.  Notice of 
each such redemption shall be 

                                       10
<PAGE>

hand delivered or mailed, by certified mail, with return receipt requested, 
at least forty-five (45) days prior to the redemption date, to the registered 
owner of the bonds which are to be redeemed at its address appearing on the 
Company's books for registration and registration of transfer.  Such delivery 
or mailing (but not the receipt thereof or the return of the receipt so 
requested) shall be a condition to the redemption of the bonds.  All bonds so 
redeemed shall forthwith be delivered to the Trustee and cancelled, but only 
when the principal, premium, if any, and accrued interest thereon is paid in 
full.  The Trustee, when required to select bonds of Collateral Series A for 
redemption, shall promptly notify the Company, and the Company, when 
selecting bonds of Collateral Series A for redemption, shall promptly notify 
the Trustee, in writing of the distinctive numbers of the bonds selected for 
redemption in whole or in part.  For the purpose only of complying with the 
Indenture (particularly Section 11.02 thereof) in connection with the 
redemption of bonds of Collateral Series A, for each $1,000 principal amount 
of bonds authenticated and delivered hereunder there shall be assigned a 
number in such manner and at such time as the Trustee or the Company shall 
deem appropriate.

          SECTION 1.05.       The Company shall call for redemption all of 
the bonds of the Collateral Series A then outstanding, and shall on the 
redemption date therefor redeem the same at a price equal to 100% of the 
principal amount thereof, together with accrued interest to the redemption 
date, in the event that an event of default has occurred and is continuing 
under Section 6.01 of the Senior Indenture, and the Senior Trustee has 
declared the principal of all Related Securities then outstanding immediately 
due and payable (or such principal has become ipso facto immediately due and 
payable) pursuant to Section 6.02 of the Senior Indenture.  The redemption 
date shall be the accelerated maturity date of the Related Securities; 
provided, however, that such requirement of redemption shall be deemed to be 
waived if prior to the date fixed for such redemption of the bonds of 
Collateral Series A, the acceleration of the Related Securities is waived or 
annulled.  Any provision of Article XI of the Indenture notwithstanding, no 
prior notice of such redemption of the bonds of Collateral Series A to the 
Trustee or the Senior Trustee shall be required.

          SECTION 1.06.       Subject to the provisions of Section 1.04, 
Bonds of Collateral Series A may be redeemed in part, but the portion of any 
such bond so redeemed in part shall be One Thousand Dollars ($1,000) or an 
integral multiple thereof.  In case any bond shall be redeemed in part only, 
payment of the redemption price of such portion of the bond of Collateral 
Series A shall be made by the Company (or Trustee, as the case may be) to the 
registered owner thereof, at its address appearing on the Company's books for 
registration and registration of transfer of bonds of Collateral Series A 
without presentation or surrender thereof, provided there is on file with the 
Company and Trustee (and not theretofore rescinded by written notice from 
such registered owner to the Company and Trustee) a written commitment from 
such registered owner to the effect that (1) payments will be so made, and 
(2) such registered owner will make notations on such bond or a paper 
attached thereto of the portion thereof so redeemed.  Prior to any transfer 
by the registered owner of any bond of Collateral Series A, the same shall be 
surrendered to the Company or Trustee for appropriate notation thereon of, or 
in exchange for a new bond or bonds for, the unredeemed balance of the 
principal amount thereof.  The Trustee shall not be under any duty to 
determine that any of the notations mentioned herein have been made or be 
liable in any manner with respect thereto.

                                      11
<PAGE>

          SECTION 1.07.       The Company shall not be obligated to make any 
transfer of bonds of Collateral Series A for a period of fifteen (15) 
calendar days next preceding any interest payment date, or next preceding any 
selection by lot of bonds to be redeemed.  The Company shall not be obligated 
to make transfers of any bonds called or being called for redemption.

          SECTION 1.08.       No charge shall be made to any registered owner 
of any bond of Collateral Series A for any transfer of bonds of said series 
except for any tax or other governmental charge required to be paid in 
connection therewith.

          SECTION 1.09.       The signatures of the President or a Vice 
President and of the Secretary or an Assistant Secretary upon the bonds of 
Collateral Series A may be facsimile signatures imprinted or otherwise 
reproduced on such bonds.  Any such facsimile signature shall have the same 
effect and shall be subject to the same provisions set forth in Section 2.13 
of the 1941 Mortgage as to signatures upon bonds generally.

          SECTION 1.10.       In the event that an interest payment or 
maturity date or a date fixed for redemption of any bond of Collateral Series 
A shall be a Saturday, Sunday or a legal holiday or a day on which banking 
institutions in the city of location of the registered address of the owner 
are authorized by law to close, then payment of interest or principal (and 
premium, if any) need not be made on such date, but may be made on the next 
succeeding business day not a Saturday, Sunday or a legal holiday or a day 
upon which banking institutions in the city of location of the registered 
address of the owner are authorized by law to close, with the same force and 
effect as if made on the date of maturity, interest date, or the date fixed 
for redemption, and no interest shall accrue for the period after such date.

          SECTION 1.11.       Bonds of Collateral Series A which have been 
redeemed or have been paid at maturity shall not be reissued as bonds of said 
series, but may be made the basis for the issuance of additional bonds of any 
series hereafter created, or credits may be taken or cash withdrawn on the 
basis thereof under any applicable provisions of the 1941 Mortgage or any 
future supplemental indenture.


                                  ARTICLE II.

                             CONFIRMATION OF LIEN

          SECTION 2.01.       The Company, in order to record the description 
of, and confirm unto the Trustee, certain property acquired after the 
execution and delivery of the 1941 Mortgage and now subject to the lien 
thereof by virtue of the provisions of the 1941 Mortgage conveying to the 
Trustee property acquired after its execution and delivery, by these presents 
does grant, bargain, sell, warrant, release, convey, assign, transfer, 
mortgage, pledge, set over and confirm unto Firstar Bank Milwaukee, National 
Association, as Trustee, and to its respective successors in said trust 
forever, subject to the rights reserved by the Company in and by other 
provisions of the Indenture and this Supplemental Indenture, all of the 
property described and mentioned or enumerated or referred to in a schedule 
hereto 

                                       12
<PAGE>

annexed and marked Schedule A, reference to said schedule for a description 
and enumeration of the property therein described and enumerated being hereby 
made with the same force and effect as if the same were incorporated herein 
at length;

          Together with all and singular the tenements, hereditaments and 
appurtenances belonging or in any wise appertaining to the aforesaid property 
or any part thereof with the reversion and reversions, remainder and 
remainders, tolls, rents and revenues, issues, income, product and profits 
thereof, and all the estate, right, title and interest and claim whatsoever, 
at law as well as in equity, which the Company now has or may hereafter 
acquire in and to the aforesaid property and every part and parcel thereof;

          To have and to hold all said properties, mortgaged, pledged or 
conveyed by the Company as aforesaid, or intended so to be, unto the Trustee 
and its successors and assigns forever, subject, however, to permissible 
encumbrances as defined in the 1941 Mortgage; but in trust, nevertheless, for 
the same purposes and upon the same conditions as are fully set forth in the 
Indenture, which is hereby referred to.
                                       
                                 ARTICLE III.

                     PARTICULAR COVENANTS OF THE COMPANY

          In addition to the covenants contained in the Indenture, the 
Company hereby covenants as follows:

          SECTION 3.01.       That it is duly authorized under the laws of 
the State of Wisconsin and under all other applicable provisions of law to 
create and issue the bonds of Collateral Series A, and to execute and deliver 
this Supplemental Indenture, and that all corporate action on its part for 
the creation and issue of said bonds and the execution of this Supplemental 
Indenture has been duly and effectually taken, and that said bonds when 
issued and delivered to the owners thereof are and will be valid and 
enforceable obligations of the Company, and that the Indenture is and always 
will be a valid mortgage and deed of trust to secure the payment of said 
bonds.

          SECTION 3.02.       That it is lawfully possessed of all the 
property mortgaged and pledged by the Indenture; that it will maintain and 
preserve the lien of the Indenture on the property mortgaged and pledged 
thereby in accordance with the terms thereof and hereof so long as any of the 
bonds issued thereunder are outstanding; and that it has good right and 
lawful authority to mortgage and pledge the property mortgaged and pledged 
thereby as provided in and by the Indenture; and that the same is free and 
clear of all liens and encumbrances, except permissible encumbrances as 
defined in the Indenture.

          SECTION 3.03.       That the Company will duly and punctually pay 
to the registered owner of bonds of Collateral Series A issued under and 
secured by the Indenture and this Supplemental Indenture the principal and 
interest of said bonds at the dates and place and in the manner mentioned in 
such bonds.

                                      13
<PAGE>

          SECTION 3.04.       That the Trustee shall not incur any liability 
by reason of any default, failure or delay on the part of the Company to 
observe or perform its covenants contained in this Article III.

                                   ARTICLE IV.

                                  MISCELLANEOUS

          SECTION 4.01.       The recitals of fact herein and in the bonds 
hereby created contained (except the Trustee's Certificate) shall be taken as 
statements of the Company and shall not be construed as made or warranted by 
the Trustee.  The Trustee makes no representations as to the validity of this 
Supplemental Indenture or of the bonds issued under the Indenture by virtue 
hereof.  Except as herein otherwise provided, no duties, responsibilities or 
liabilities are assumed, or shall be construed to be assumed, by the Trustee 
by reason of this Supplemental Indenture other than as set forth in the 
Indenture; and this Supplemental Indenture is executed and accepted on behalf 
of the Trustee, subject to all the terms and conditions set forth in the 
Indenture, as fully to all intents as if the same were herein set forth at 
length.

          SECTION 4.02.       This Supplemental Indenture shall be construed 
in connection with and as a part of the Indenture.

          SECTION 4.03.       (a) Whenever in this Supplemental Indenture 
either of the parties hereto is named or referred to, such reference shall be 
deemed to include the successors or assigns of such party, and all the 
covenants and agreements in this Supplemental Indenture contained 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.

          (b)  The table of contents and 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.

          SECTION 4.04.       (a) If any provision of this Supplemental 
Indenture limits, qualifies, or conflicts with another provision of this 
Supplemental Indenture or of the Indenture required or deemed to be included 
in indentures qualified under the Trust Indenture Act of 1939 (as enacted 
prior to the date of this Supplemental Indenture) by any of Sections 310 to 
317, inclusive, of the said Act, such required provisions shall control.

          (b)  In case any one or more of the provisions contained in this 
Supplemental Indenture or in the bonds, issued hereunder and under the 
Indenture 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.

                                      14
<PAGE>

          SECTION 4.05.       This Supplemental Indenture may be executed in 
several counterparts, and all said counterparts executed and delivered, each 
as an original, shall constitute but one and the same instrument.

          SECTION 4.06.       This Supplemental Indenture shall be effective 
and binding from and after the time of actual execution and delivery thereof, 
notwithstanding the fact that such execution and delivery may occur prior or 
subsequent to December 1, 1998.

          SECTION 4.07.       The debtor and its mailing address is WISCONSIN 
PUBLIC SERVICE CORPORATION, 700 North Adams Street, P.O. Box 19001, Green 
Bay, Wisconsin 54307.  The secured party and its address, from which 
information concerning the security interest hereunder may be obtained, is 
FIRSTAR BANK MILWAUKEE, N.A., NATIONAL ASSOCIATION, Corporate Trust 
Department, 1555 North RiverCenter Drive, Suite 301, Milwaukee, Wisconsin 
53212.

                                      15
<PAGE>


          IN WITNESS WHEREOF, the party of the first part has caused its 
corporate name and seal to be hereunto affixed and this Supplemental 
Indenture to be signed by its Chairman, President or Vice President, and 
attested by its Secretary or an Assistant Secretary, for and in its behalf, 
and the party of the second part has caused its corporate name and seal to be 
hereunto affixed, and this Supplemental Indenture to be signed by its 
President, a Vice President or an Assistant Vice President, and attested by 
its Secretary or an Assistant Secretary, for and in its behalf, all done as 
of the first day of December, 1998.

                              WISCONSIN PUBLIC SERVICE CORPORATION,


                              By:  /s/ Daniel P. Bittner
                                  --------------------------------
                                   Daniel P. Bittner,
                                   Senior Vice President-Finance
(SEAL)

Attest:

/s/ Francis J. Kicsar
- -------------------------------------
Francis J. Kicsar
Secretary

Executed by Wisconsin Public Service
  Corporation, in presence of:

/s/ Diane L. Behling
- -------------------------------------
Diane L. Behling

/s/ Patti L. Herrmann
- -------------------------------------
Patti L. Herrmann

                                      16
<PAGE>

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


                              By:  /s/ Amy E. Nolde
                                  -----------------------------------
                                   Amy E. Nolde
                                   Assistant-Vice President
(SEAL)

Attest:


/s/ Yvonne Siira
- -------------------------------------
Yvonne Siira
Assistant Secretary

Executed by Firstar Bank Milwaukee, N.A., National Association
in presence of:

/s/ Lori E. Sandvik
- -------------------------------------
Lori E. Sandvik, Assistant Secretary

/s/ Peter M. Brennan
- -------------------------------------
Peter M. Brennan, Assistant Secretary

                                       17
<PAGE>

STATE OF WISCONSIN       }
                         }  ss.
BROWN COUNTY             }

          Personally came before me this 15th day of December, A.D. 1998, 
Daniel P. Bittner, to me known to be the Senior Vice President-Finance, and 
Francis J. Kicsar, to me known to be the Secretary of the above-named 
WISCONSIN PUBLIC SERVICE CORPORATION, the corporation described in and which 
executed the foregoing instrument, and to me known to be the persons who as 
such officers executed the foregoing instrument in the name and behalf of 
said corporation, and acknowledged the same, and acknowledged that the seal 
affixed to said instrument is the corporate seal of said corporation, and 
that they signed, sealed and delivered said instrument in the name and behalf 
of said corporation by authority of its Board of Directors and said Daniel P. 
Bittner and Francis J. Kicsar then and there acknowledged said instrument to 
be the free act and deed of said corporation by each of them voluntarily 
executed.

          Given under my hand and notarial seal this 15th day of December, 
A.D. 1998.

                              /s/ Barth J. Wolf
                              -----------------------------------------
                              Barth J. Wolf
                              Notary Public, Brown County, Wisconsin
                              My commission is permanent.

(NOTARIAL SEAL)

                                       18
<PAGE>


STATE OF WISCONSIN       }
                         }  ss.
MILWAUKEE COUNTY         }

          Personally came before me this 15TH day of December, A.D. 1998, AMY 
E. NOLDE, to me known to be a Vice President and YVONNE SIIRA, to me known to 
be an Assistant Secretary of the above-named FIRSTAR BANK MILWAUKEE, N.A., 
NATIONAL ASSOCIATION, the corporation described in and which executed the 
foregoing instrument, and to me known to be the persons who as such officers 
executed the foregoing instrument in the name and behalf of said corporation, 
and acknowledged the same, and acknowledged that the seal affixed to said 
instrument is the corporate seal of said corporation, and that they signed, 
sealed and delivered said instrument in the name and behalf of said 
corporation by authority of its Board of Directors and said AMY E. NOLDE and 
YVONNE SIIRA then and there acknowledged said instrument to be the free act 
and deed of said corporation by each of them voluntarily executed.

          Given under my hand and notarial seal this 15TH day of December, 
A.D. 1998.

                              /s/ F. J. Gingrasso
                              --------------------------------------
                              F. J. Gingrasso
                              Notary Public, Milwaukee County, Wisconsin
                              My commission is permanent

(NOTARIAL SEAL)




This instrument was drafted by Attorney Michael S. Nolan of the law firm of 
Foley & Lardner, Milwaukee, Wisconsin.

                                       19


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