NORTHERN STATES POWER CO /MN/
8-K, 1998-03-16
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)       MARCH  11, 1998
                                                      ------------------------


                            NORTHERN STATES POWER COMPANY              
- ------------------------------------------------------------------------------
               (Exact name of registrant as specified in its charter)
                                          
                                      MINNESOTA                 
- ------------------------------------------------------------------------------
                   (State or other jurisdiction of incorporation)
                                          
             1-3034                                   41-0448030    
- -------------------------------------        ---------------------------------
     (Commission File Number)               (IRS Employer  Identification No.)

     414 NICOLLET MALL, MPLS, MN                       55401               
- ------------------------------------------------------------------------------
(Address of principal executive offices)              (Zip Code)


     Registrant's telephone number, including area code     612-330-5500   
                                                         ---------------------

- ------------------------------------------------------------------------------
            (Former name of former address, if changed since last report)

<PAGE>

ITEM 5.   OTHER EVENTS

On March 11, 1998, Northern States Power Company, a Minnesota corporation 
(the "Company") entered into an Underwriting Agreement and filed with the 
Securities and Exchange Commission a prospectus supplement relating to 
$150,000,000 in aggregate principal amount of the Company's First Mortgage 
Bonds, Series due March 1, 2028 and entered into an Underwriting Agreement 
and filed with the Securities and Exchange Commission a prospectus supplement 
relating to $100,000,000 in aggregate principal amount of the Company's First 
Mortgage Bonds, Series due March 1, 2003.

ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS

(c)  Exhibits

<TABLE>
<CAPTION>

  Exhibit No.  Description
  -----------  -----------
  <C>          <S>
     1.01      Underwriting Agreement, dated March 11, 1998 between Northern
               States Power Company and Salomon Brothers, Inc., ABN Amro,
               BancAmerica, Bear Stearns & Co. Inc., Chase Securities Inc., and 
               Nationsbanc relating to $100,000,000 First Mortgage Bonds, Series 
               due March 1, 2003.

     1.02      Underwriting Agreement dated March 11, 1998 between Northern
               States Power Company and Salomon Brothers, Inc., ABN Amro,
               BancAmerica, Bear Stearns & Co. Inc., Chase Securities Inc., and 
               Nationsbanc relating to $150,000,000 First Mortgage Bonds, Series 
               due March 1, 2028.

     4.01      Supplemental Trust Indenture dated March 1, 1998 between Northern
               States Power Company and Harris Trust and Savings Bank as
               Trustee, creating $150,000,000 principal amount First Mortgage
               Bonds, Series due March 1, 2028 and $100,000,000 principal amount
               First Mortgage Bonds, Series due March 1, 2003.

     12.01     Computation of ratio of earnings to fixed charges.
</TABLE>

<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.

                              Northern States Power Company
                              (a Minnesota Corporation)
                              
                              
                              
                              By   /s/ Edward J. McIntyre
                                  ------------------------------------
                                  Edward J. McIntyre
                                  Vice President and Chief Financial Officer
Dated:  March 13, 1998

<PAGE>
                                    EXHIBIT INDEX

<TABLE>
<CAPTION>

Method of   Exhibit
 Filing       No.     Description
- --------    -------   -----------
<C>         <C>       <S>
  DT         1.01     Underwriting Agreement, dated March 11, 1998 between                  
                      Northern States Power Company and Salomon Brothers,
                      Inc., ABN Amro, BancAmerica, Bear Stearns & Co. Inc., Chase
                      Securities Inc., and Nationsbanc relating to $100,000,000 First
                      Mortgage Bonds, Series due March 1, 2003.

  DT         1.02     Underwriting Agreement dated March 11, 1998 between                   
                      Northern States Power Company and Salomon Brothers,
                      Inc., ABN Amro, BancAmerica, Bear Stearns & Co. Inc., Chase
                      Securities Inc., and Nationsbanc relating to $150,000,000 First
                      Mortgage Bonds, Series due March 1, 2028.

  DT         4.01     Supplemental Trust Indenture dated March 1, 1998 between                   
                      Northern States Power Company and Harris Trust and
                      Savings Bank as Trustee, creating $150,000,000 principal
                      amount First Mortgage Bonds, Series due March 1, 2028 and
                      $100,000,000 principal amount First Mortgage Bonds, Series
                      due March 1, 2003.

  DT        12.01    Computation of ratio of earnings to fixed charges.

</TABLE>

DT = Filed electronically with direct transmission of this Form 8-K.


<PAGE>
                         NORTHERN STATES POWER COMPANY
                           (A MINNESOTA CORPORATION)
                              FIRST MORTGAGE BONDS
                             UNDERWRITING AGREEMENT
 
To the Representatives named in Schedule I
  hereto of the Underwriters named in
  Schedule II hereto
 
Dear Sirs:
 
    Northern States Power Company, a Minnesota corporation (the "Company"),
proposes to sell to the underwriters named in Schedule II hereto (the
"Underwriters"), for whom you are acting as representatives (the
"Representatives"), its First Mortgage Bonds of the designation, with the terms
and in the aggregate principal amount specified in Schedule I hereto (the
"Bonds") to be issued under its Trust Indenture, dated as of February 1, 1937,
from the Company to Harris Trust and Savings Bank, as trustee (the "Trustee"),
as heretofore supplemented and amended by supplemental trust indentures and as
to be further supplemented and amended by a supplemental trust indenture
relating to the Bonds (such Trust Indenture as so supplemented and amended and
as to be so supplemented and amended being hereinafter referred to as the
"Indenture"). If the firm or firms listed in Schedule II hereto include only the
firm or firms listed in Schedule I hereto, then the terms "Underwriters" and
"Representatives," as used herein, shall each be deemed to refer to such firm or
firms.
 
    Concurrently with the offering of the Bonds, the Company proposes to issue
and sell $150,000,000 of its 6 1/2% First Mortgage Bonds, Series due March 1,
2028 (the "Additional Bonds"). The Additional Bonds also will be issued under
the Indenture. The sale of the Bonds and the Additional Bonds are not contingent
upon each other.
 
    1.  REPRESENTATIONS AND WARRANTIES BY THE COMPANY.  The Company represents
and warrants to, and agrees with, each Underwriter that:
 
        (a) The Company meets the requirements for use of Form S-3 under the
    Securities Act of 1933, as amended (the "Act") and has filed with the
    Securities and Exchange Commission (the "Commission") a registration
    statement on such Form, including a prospectus, for the registration under
    the Act of the Bonds and the Additional Bonds, which registration statement
    has become effective. Such registration statement and prospectus may have
    been amended or supplemented from time to time prior to the date of this
    Agreement (which date is set forth in Schedule I hereto). Any such amendment
    or supplement was filed with the Commission and any such amendment has
    become effective. The Company will file with the Commission a prospectus
    supplement (the "Prospectus Supplement") relating to the Bonds pursuant to
    Rule 424 and/or Rule 434 under the Act. Copies of such registration
    statement and prospectus, any such amendment or supplement and all documents
    incorporated by reference therein which were filed with the Commission on or
    prior to the date of this Agreement have been delivered to you and copies of
    the Prospectus Supplement will be delivered to you promptly after it is
    filed with the Commission. Such registration statement, as amended prior to
    the date of this Agreement, and such prospectus, as amended and supplemented
    prior to the date of this Agreement and as supplemented by the Prospectus
    Supplement, are hereinafter called the "Registration Statement" and the
    "Prospectus", respectively. Any reference herein to the Registration
    Statement or the 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 Securities Exchange Act
 
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<PAGE>
    of 1934, as amended (the "Exchange Act") on or before the date of this
    Agreement and, if the Company files any document pursuant to the Exchange
    Act after the date of this Agreement and prior to the termination of the
    offering of the Bonds by the Underwriters, which documents are deemed to be
    incorporated by reference into the Prospectus, the term "Prospectus" shall
    refer also to said prospectus as supplemented by the documents so filed from
    and after the time said documents are filed with the Commission. There are
    no contracts or documents of the Company or any of its subsidiaries that are
    required to be filed as exhibits to the Registration Statement or any
    documents incorporated by reference therein by the Act, the Exchange Act or
    the rules and regulations thereunder which have not been so filed.
 
        (b) No order preventing or suspending the use of the Prospectus or the
    Registration Statement has been issued by the Commission and the
    Registration Statement, at the date of this Agreement, complied in all
    material respects with the requirements of the Act, the Trust Indenture Act
    of 1939, as amended (the "Trust Indenture Act") and the respective rules and
    regulations of the Commission thereunder and did not contain any untrue
    statement of a material fact or omit any material fact required to be stated
    therein or necessary in order to make the statements therein not misleading;
    and, at the time the Prospectus Supplement is filed with the Commission and
    at the Closing Date (as hereinafter defined), the Prospectus will comply in
    all material respects with the Act and the rules and regulations of the
    Commission thereunder and will not contain any untrue statement of a
    material fact or omit to state any material fact required to be stated
    therein or necessary to make the statements therein not misleading; PROVIDED
    that the Company makes no representations or warranties as to (A) that part
    of the Registration Statement which shall constitute the Statement of
    Eligibility (Form T-1) under the Trust Indenture Act of the Trustee or (B)
    the information contained in or omitted from the Registration Statement or
    the Prospectus 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 use in the Registration Statement or
    Prospectus.
 
        (c) The documents incorporated by reference in the Prospectus, when they
    were filed with the Commission, conformed in all material respects to the
    requirements of the Exchange Act and the rules and regulations of the
    Commission thereunder, and any documents so filed and incorporated by
    reference subsequent to the date of this Agreement will, when they are filed
    with the Commission, conform in all material respects to the requirements of
    the Exchange Act, and the rules and regulations of the Commission
    thereunder; and none of such documents include or will include any untrue
    statement of a material fact or omit or will omit to state any material fact
    required to be stated therein or necessary to make the statements therein in
    the light of the circumstances under which they were made not misleading.
 
        (d) Deloitte & Touche LLP and Price Waterhouse LLP which audited certain
    of the financial statements incorporated by reference in the Registration
    Statement, are each independent public accountants as required by the Act
    and the rules and regulations of the Commission thereunder.
 
        (e) The financial statements of the Company and its consolidated
    subsidiaries filed as a part of or incorporated by reference in the
    Registration Statement or Prospectus fairly present the financial position
    of the Company and its consolidated subsidiaries as of the dates indicated
    and the results of their operations and changes in financial position for
    the periods specified, and have been prepared in conformity with generally
    accepted accounting principles applied on a consistent basis throughout the
    periods involved, except as disclosed in the Prospectus Supplement.
 
        (f) The Company has been duly incorporated and is validly existing as a
    corporation in good standing under the laws of the State of Minnesota with
    due corporate authority to carry on the business in which it is engaged and
    to own and operate the properties used by it in such business, as described
    in the Prospectus; the Company is qualified to do business as a foreign
    corporation and is in good standing under the laws of the States of North
    Dakota and South Dakota; and the Company is
 
                                       2
<PAGE>
    not required by the nature of its business to be licensed or qualified as a
    foreign corporation in any other state or jurisdiction; and, except as set
    forth in the Prospectus Supplement, the Company has all material licenses
    and approvals required at the date hereof to conduct its business.
 
        (g) Each subsidiary of the Company named in Exhibit 21.01 to the
    Company's most recent Annual Report on Form 10-K ("Significant Subsidiary")
    has been duly incorporated and is validly existing as a corporation in good
    standing under the laws of the jurisdiction of its incorporation and is duly
    qualified as a foreign corporation to transact business and is in good
    standing in each jurisdiction in which it owns or leases substantial
    properties or in which the conduct of its business requires such
    qualification; all of the issued and outstanding capital stock of each such
    subsidiary has been duly authorized and validly issued and is fully paid and
    non-assessable; and the capital stock of each such subsidiary owned by the
    Company, directly or through subsidiaries, is owned free and clear of any
    pledge, lien, encumbrance, claim or equity.
 
        (h) Neither the Company nor any of its subsidiaries has sustained since
    the date of the latest audited financial statements included or incorporated
    by reference in the Prospectus any material loss or interference with its
    business from fire, explosion, flood or other calamity, whether or not
    covered by insurance, or from any labor dispute or court or governmental
    action, order or decree, otherwise than as set forth or contemplated in the
    Prospectus Supplement; and, since the respective dates as of which
    information is given in the Registration Statement and the Prospectus
    Supplement, neither the Company nor any of its subsidiaries has incurred any
    liabilities or obligations, direct or contingent, or entered into any
    transactions, not in the ordinary course of business, which are material to
    the Company and its subsidiaries, and there has not been any material change
    in the capital stock or long-term debt of the Company or any of its
    subsidiaries or any material adverse change, or any development involving a
    prospective material adverse change, in or affecting the general affairs,
    management, financial position, stockholders' equity or results of
    operations of the Company and its subsidiaries, otherwise than as set forth
    or contemplated in the Prospectus Supplement.
 
        (i) Neither the execution and delivery of this Agreement and the
    Indenture, the issuance and delivery of the Bonds, the consummation of the
    transactions herein contemplated, the fulfillment of the terms hereof, nor
    compliance with the terms and provisions of this Agreement, the Bonds and
    the Indenture will conflict with, or result in the breach of, any of the
    terms, provisions or conditions of the Restated Articles of Incorporation,
    as amended, or by-laws of the Company, or of any contract, agreement or
    instrument to which the Company is a party or in which the Company has a
    beneficial interest or by which the Company is bound or of any order, rule
    or regulation applicable to the Company of any court or of any federal or
    state regulatory body or administrative agency or other governmental body
    having jurisdiction over the Company or over its properties.
 
        (j) The Bonds have been duly authorized for issuance and sale pursuant
    to this Agreement and, when executed and authenticated in accordance with
    the Indenture and delivered and paid for as provided herein, will be duly
    issued and will constitute valid and binding obligations of the Company
    enforceable in accordance with their terms, except as limited by bankruptcy,
    insolvency and other laws affecting enforcement of creditors' rights, and
    will be entitled to the benefits of the Indenture which will be
    substantially in the form heretofore delivered to you.
 
        (k) The Indenture has been duly and validly authorized by the Company
    and, when duly executed and delivered by the Company, assuming due
    authorization, execution and delivery thereof by the Trustee, will
    constitute a valid and binding obligation of the Company enforceable in
    accordance with its terms, except as enforcement thereof may be limited by
    bankruptcy, insolvency or other laws affecting enforcement of creditors'
    rights.
 
        (l) The Minnesota Public Utilities Commission has issued its order
    approving capital structure which order authorizes the issuance of the
    Bonds, and no other approval of any regulatory public body, state or
    federal, is, or will be at the Closing Date (as hereinafter defined),
    necessary in
 
                                       3
<PAGE>
    connection with the issuance and sale of the Bonds pursuant to this
    Agreement, other than approvals that may be required under state securities
    laws.
 
       (m) The Company has good and valid title to all real and fixed property
    and leasehold rights described or enumerated in the Indenture (except such
    properties as have been released from the lien thereof in accordance with
    the terms thereof), subject only to taxes and assessments not yet
    delinquent; the lien of the Indenture; as to parts of the Company's
    property, certain easements, conditions, restrictions, leases, and similar
    encumbrances which do not affect the Company's use of such property in the
    usual course of its business, and certain minor defects in titles which are
    not material, and defects in titles to certain properties which are not
    essential to the Company's business; and mechanics' lien claims being
    contested or not of record or for the satisfaction or discharge of which
    adequate provision has been made by the Company pursuant to the Indenture;
    and any real property and buildings held under lease by the Company is held
    by it under valid, subsisting and enforceable leases with such exceptions as
    are not material and do not interfere with the use made and proposed to be
    made of such property and buildings by the Company.
 
        (n) Other than as set forth or contemplated in the Prospectus as of the
    date hereof, there are no legal or governmental proceedings pending to which
    the Company or any of its subsidiaries is a party or of which any property
    of the Company or any of its subsidiaries is the subject which, if
    determined adversely to the Company or any of its subsidiaries, would
    individually or in the aggregate have a material adverse effect on the
    consolidated financial position, stockholders' equity or results of
    operations of the Company and its subsidiaries; and, to the best of the
    Company's knowledge, no such proceedings are threatened or contemplated by
    governmental authorities or threatened by others.
 
        (o) The Company is not an "investment company" or an entity "controlled"
    by an "investment company," as such terms are defined in the Investment
    Company Act of 1940, as amended.
 
        (p) Except as set forth in the Prospectus Supplement, the Company and
    its subsidiaries (A) are in compliance with any and all applicable 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"), (B) have received
    all permits, licenses or other approvals required of them under applicable
    Environmental Laws to conduct its respective business and (C) are in
    compliance with all terms and conditions of any such permits, licenses or
    approvals, except where such noncompliance with Environmental Laws, failure
    to receive required permits, licenses or other approvals or failure to
    comply with the terms and conditions of such permits, licenses or approvals
    would not, singly or in the aggregate, have a material adverse effect on the
    Company and its subsidiaries, taken as a whole.
 
    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 the Representatives and each other Underwriter, and the Representatives
and each other Underwriter agree, severally and not jointly, to purchase from
the Company, at the purchase price set forth in Schedule I hereto, the
respective principal amounts of the Bonds set forth opposite their respective
names in Schedule II hereto.
 
    3.  DELIVERY AND PAYMENT.  Delivery of and payment for the Bonds shall be
made at the place, date and time specified in Schedule I hereto (or such other
place, date and time not later than eight full business days thereafter as the
Representatives and the Company shall designate), which date and time may be
postponed by agreement between the Representatives and the Company (such date
and time being herein called the "Closing Date"). Delivery of the Bonds 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 certified or official bank check or checks payable in New York
Clearing House (next day) funds or, if so indicated in Schedule I hereto, in
federal (same day) funds. The Bonds will be delivered in definitive registered
form except that, if for any reason the Company is unable to deliver the Bonds
in definitive form, the Company
 
                                       4
<PAGE>
reserves the right, as provided in the Indenture, to make delivery in temporary
form. Any Bonds delivered in temporary form will be exchangeable without charge
for Bonds in definitive form. The Bonds will be registered in the names of the
Underwriters and in the principal amounts set forth in Schedule II hereto except
that if the Company receives a written request from the Representatives prior to
noon on the second business day preceding the Closing Date giving the names in
which the Bonds are to be registered and the principal amounts thereof (which
shall in each case be a multiple of $1,000) the Company will deliver the Bonds
so registered. The Bonds will be made available to the Representatives for
checking in New York, New York, not later than 2:00 p.m., New York City time, on
the business day preceding the Close Date.
 
    4.  AGREEMENTS.  The Company agrees with the several Underwriters that:
 
        (a) With the consent of the Representatives, the Company will cause the
    Prospectus Supplement to be filed pursuant to Rule 424 (b) and/or Rule 434
    under the Act and will notify the Representatives promptly of such filing.
    During the period for which a prospectus relating to the Bonds is required
    to be delivered under the Act, the Company will promptly advise the
    Representatives (i) when any amendment to the Registration Statement shall
    have become effective, (ii) when any subsequent supplement to the Prospectus
    (including documents deemed to be incorporated by reference into the
    Prospectus) has been filed, (iii) of any request by the Commission for any
    amendment of or supplement to the Registration Statement or the Prospectus
    or for any additional information, and (iv) of the issuance by the
    Commission of any stop order suspending the effectiveness of the
    Registration Statement or the institution or threatening of any proceedings
    for that purpose. The Company will not file any amendment of the
    Registration Statement or supplement to the Prospectus (including documents
    deemed to be incorporated by reference into the Prospectus) unless the
    Company has furnished to the Representatives a copy for your review prior to
    filing and will not file any such proposed amendment or supplement to which
    the Representatives reasonably object. The Company will use its best efforts
    to prevent the issuance of any such stop order and, if issued, to obtain as
    soon as possible the withdrawal thereof.
 
        (b) If, at any time when a prospectus relating to the Bonds is required
    to be delivered under the Act, any event occurs as a result of which the
    Prospectus as then amended or 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 at any time to
    amend or supplement the Prospectus to comply with the Act or the Exchange
    Act or the respective rules and regulations of the Commission thereunder,
    the Company promptly, subject to paragraph (a) of this Section 4, will
    prepare and file an amendment or supplement to the Prospectus with the
    Commission or will make a filing with the Commission pursuant to Section 13
    or 14 of the Exchange Act, which will correct such statement or omission or
    will effect such compliance.
 
        (c) The Company will make generally available to its security holders
    and to the Representatives a consolidated earnings statement (which need not
    be audited) of the Company, for a twelve-month period beginning after the
    date of the Prospectus Supplement filed pursuant to Rule 424(b) and/or Rule
    434 under the Act, as soon as is reasonably practicable after the end of
    such period, but in any event no later than eighteen months after the
    "effective date of the Registration Statement" (as defined in Rule 158(c)
    under the Act), which will satisfy the provision of Section 11(a) of the Act
    and the rules and regulations of the Commission thereunder (including at the
    option of the Company, Rule 158).
 
        (d) The Company will furnish to each of the Representatives a signed
    copy of the Registration Statement as originally filed and of each amendment
    thereto, including the Form T-1 of the Trustee and all powers of attorney,
    consents and exhibits filed therewith (other than exhibits incorporated by
    reference), and will deliver to the Representatives conformed copies of the
    Registration Statement,
 
                                       5
<PAGE>
    the Prospectus (including all documents incorporated by reference therein)
    and, so long as delivery of a prospectus by an Underwriter or dealer may be
    required by the Act, all amendments of and supplements to such documents, in
    each case as soon as available and in such quantities as the Representatives
    may reasonably request.
 
        (e) The Company will furnish such information, execute such instruments
    and take such action as may be required to qualify the Bonds 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 Bonds; PROVIDED that the Company shall not be required
    to qualify to do business in any jurisdiction where it is not now so
    qualified or to take any action which would subject it to general or
    unlimited service of process in any jurisdiction where it is not now so
    subject.
 
        (f) So long as the Bonds are outstanding, the Company will furnish (or
    cause to be furnished) to each of the Representatives, upon request, copies
    of (i) all reports to stockholders of the Company and (ii) all reports and
    financial statements filed with the Commission or any national securities
    exchange.
 
        (g) During the period beginning from the date of this Agreement and
    continuing to the Closing Date, the Company will not offer, sell, or
    otherwise dispose of any first mortgage bonds of the Company (except the
    Additional Bonds and except under prior contractual commitments which have
    been disclosed to you), without the prior written consent of the
    Representatives, which consent shall not be unreasonably withheld.
 
    5.  EXPENSES.  Whether or not the transactions contemplated hereunder are
consummated or this Agreement is terminated, the Company will pay all costs and
expenses incident to the performance of the obligations of the Company
hereunder, including, without limiting the generality of the foregoing, all
costs, taxes and expenses incident to the issue and delivery of the Bonds to the
Underwriters, all fees and expenses of the Company's counsel and accountants,
all costs and expenses incident to the preparing, printing and filing of the
Registration Statement (including all exhibits thereto), the Prospectus
(including all documents incorporated by reference therein) and any amendments
thereof or supplements thereto, all costs and expenses (including fees and
expenses of counsel) incurred in connection with "blue sky" qualifications, the
determination of the legality of the Bonds for investment by institutional
investors and the rating of the Bonds, and all costs and expenses of the
printing and distribution of all documents in connection with this underwriting.
Except as provided in this Section 5 and Section 8 hereof, the Underwriters will
pay all their own costs and expenses, including the fees of their counsel and
any advertising expenses in connection with any offer they may make.
 
    6.  CONDITIONS TO THE OBLIGATIONS OF THE UNDERWRITERS.  The obligations of
the Underwriters to purchase the Bonds shall be subject, in the discretion of
the Representatives, to the accuracy of the representations and warranties on
the part of the Company contained herein as of the date hereof and the Closing
Date, to the accuracy of the statements of Company officers made in any
certificates given pursuant to the provisions hereof, to the performance by the
Company of its obligations hereunder and to the following additional conditions:
 
        (a) The Prospectus Supplement relating to the Bonds shall have been
    filed with the Commission pursuant to Rule 424(b) and/or Rule 434 within the
    applicable time period prescribed for such filing by the rules and
    regulations under the Act and in accordance with Section 4(a) hereof; no
    stop order suspending the effectiveness of the Registration Statement or any
    part thereof shall have been issued and no proceeding for that purpose shall
    have been initiated or threatened by the Commission; and all requests for
    additional information on the part of the Commission shall have been
    complied with to the Representatives' reasonable satisfaction.
 
                                       6
<PAGE>
        (b) The Representatives shall be furnished with opinions, dated the
    Closing Date, of Gary R. Johnson, Vice President and General Counsel of the
    Company, substantially in the form included as Exhibit A.
 
        (c) The Representatives shall have received from Gardner, Carton &
    Douglas, Chicago, Illinois, counsel for the Underwriters, such opinion or
    opinions dated the Closing Date with respect to the incorporation of the
    Company, this Agreement, the validity of the Indenture, the Bonds, the
    Registration Statement, the Prospectus and other related matters as the
    Representatives may reasonably require, and the Company shall have furnished
    to such counsel such documents as they reasonably 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 President or any Vice President of the Company, dated the
    Closing Date, as to the matters set forth in clause (a) and (h) of this
    Section 6 and to the further effect that the signers of such certificate
    have carefully examined the Registration Statement, the Prospectus and this
    Agreement and that:
 
            (i) the representations and warranties of the Company in this
       Agreement are true and correct 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; and
 
            (ii) there has been no material adverse change in the condition of
       the Company and its subsidiaries taken as a whole, financial or
       otherwise, or in the earnings, affairs or business prospects of the
       Company and its subsidiaries taken as a whole, whether or not arising in
       the ordinary course of business, from that set forth or contemplated by
       the Registration Statement or Prospectus Supplement.
 
        (e) The Representatives shall have received letters from the Company's
    independent public accountants (dated the date of this Agreement and Closing
    Date, respectively, and in form and substance satisfactory to the
    Representatives) advising that (i) they are independent public accountants
    as required by the Act and published rules and regulations of the Commission
    thereunder, (ii) in their opinion, the consolidated financial statements and
    supplemental schedules incorporated by reference in the Registration
    Statement and covered by their opinion filed with the Commission under
    Section 13 of the Exchange Act comply as to form in all material respects
    with the applicable accounting requirements of the Exchange Act and the
    published rules and regulations of the Commission thereunder, (iii) they
    have performed limited procedures, not constituting an audit, including a
    reading of the latest available interim financial statements of the Company
    and its consolidated subsidiaries, a reading of the minutes of meetings of
    the Board of Directors, committees thereof, and of the Shareholders, of the
    Company and its subsidiaries since the date of the most recent audited
    financial statements included or incorporated by reference in the
    Prospectus, inquiries of officials of the Company and its subsidiaries
    responsible for financial accounting matters and such other inquiries and
    procedures as may be specified in such letter, and on the basis of such
    limited review and procedures nothing came to their attention that caused
    them to believe that: (a) any material modifications should be made to any
    unaudited consolidated financial statements of the Company included or
    incorporated by reference in the Registration Statement or Prospectus for
    them to be in conformity with generally accepted accounting principles or
    any unaudited consolidated financial statements of the Company included or
    incorporated by reference in the Registration Statement or Prospectus do not
    comply as to form in all material respects with the applicable accounting
    requirements of the Exchange Act and the rules and regulations of the
    Commission applicable to Form 10-Q; (b) with respect to the period
    subsequent to the date of the most recent financial statements included or
    incorporated by reference in the Prospectus and except as set forth in or
    contemplated by the Registration Statement or Prospectus, there were any
    changes, at a specified date not more than five business days prior to the
    date of the letter, in the capital stock of the
 
                                       7
<PAGE>
    Company, increases in long-term debt or decreases in stockholders' equity or
    net current assets of the Company and its consolidated subsidiaries as
    compared with the amounts shown on the most recent consolidated balance
    sheet included or incorporated in the Prospectus, or for the period from the
    date of the most recent financial statements included or incorporated by
    reference in the Prospectus to such specified date there were any decreases,
    as compared with the corresponding period in the preceding year, in
    operating revenues, operating income, net income, or earnings per share of
    Common Stock of the Company and its subsidiaries, 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; and (iv) they have carried out specified procedures
    performed for the purpose of comparing certain specified financial
    information and percentages (which is limited to financial information
    derived from general accounting records of the Company) included or
    incorporated by reference in the Registration Statement and Prospectus with
    indicated amounts in the financial statements or accounting records of the
    Company and (excluding any questions of legal interpretation) have found
    such information and percentages to be in agreement with the relevant
    accounting and financial information of the Company referred to in such
    letter in the description of the procedures performed by them.
 
        (f) Subsequent to the respective dates as of which information is given
    in the Registration Statement and the Prospectus, there shall not have been
    any change or decrease specified in the letter or letters referred to in
    paragraph (e) of this Section 6 which makes it impractical or inadvisable in
    the judgment of the Representatives to proceed with the public offering or
    the delivery of the Bonds on the terms and in the manner contemplated by the
    Prospectus.
 
        (g) Subsequent to the date hereof, no downgrading shall have occurred,
    nor shall any notice have been given of any intended or potential
    downgrading or of any review for a possible change that does not indicate
    the direction of the possible change, in the rating accorded the Company's
    debt securities or preferred stock by any "nationally recognized statistical
    rating organization," as that term is defined by the Commission for purposes
    of Rule 436(g)(2) under the Act.
 
        (h) (i) Neither the Company nor any of its subsidiaries shall have
    sustained since the date of the latest audited financial statements included
    or incorporated by reference in the Prospectus any loss or interference with
    its business from fire, explosion, flood or other calamity, whether or not
    covered by insurance, or from any labor dispute or court or governmental
    action, order or decree, otherwise than as set forth or contemplated in the
    Prospectus Supplement, and (ii) since the date of this Agreement, neither
    the Company nor any of its subsidiaries shall have incurred any liabilities
    or obligations, direct or contingent, or entered into any transactions, not
    in the ordinary course of business, which are material to the Company and
    its subsidiaries, and there shall not have been any change in the capital
    stock or long-term debt of the Company or any of its subsidiaries or any
    change, or any development involving a prospective change, in or affecting
    the general affairs, management, financial position, stockholders' equity or
    results of operations of the Company and its subsidiaries otherwise than as
    set forth or contemplated in the Prospectus Supplement, the effect of which,
    in any such case described in clause (i) or (ii) is in the judgment of the
    Underwriters so material and adverse as to make it impracticable or
    inadvisable to proceed with the public offering or the delivery of the Bonds
    on the terms and in the manner contemplated by the Prospectus.
 
        (i) No Representative shall have advised the Company that the
    Registration Statement or Prospectus, or any amendment or supplement
    thereto, contains an untrue statement of fact which in the opinion of
    counsel for the Underwriters is material or omits to state a fact which in
    the opinion of counsel for the Underwriters is material and is required to
    be stated therein or is necessary to make the statements therein not
    misleading.
 
        (j) Prior to the Closing Date, the Company shall have furnished to the
    Representatives such further information, certificates and documents as they
    may reasonably request.
 
                                       8
<PAGE>
    If any of the conditions specified in this Section 6 shall not have been
fulfilled when and as required by this Agreement, or if any of the opinions and
certificates mentioned above or elsewhere in this Agreement shall not be
satisfactory in form and substance to the Representatives and their counsel,
this Agreement and all obligations of the Underwriters hereunder may be
cancelled 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 telegraph confirmed in writing.
 
    7.  CONDITIONS OF COMPANY'S OBLIGATIONS.  The obligations of the Company to
sell and deliver the Bonds are subject to the following conditions:
 
        (a) Prior to the Closing Date, 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, to the knowledge
    of the Company or the Representative, threatened.
 
        (b) The order of the Minnesota Public Utilities Commission referred to
    in paragraph (1) of Section 1 shall be in full force and effect.
 
    If any of the conditions specified in this Section 7 shall not have been
fulfilled, this Agreement and all obligations of the Company hereunder may be
cancelled on or at any time prior to the Closing Date by the Company. Notice of
such cancellation shall be given to the Underwriters in writing or by telephone
or facsimile transmission confirmed in writing.
 
    8.  REIMBURSEMENT OF UNDERWRITERS' EXPENSES.  If the sale of the Bonds
provided for herein is not consummated because any condition to the obligations
of the Underwriters set forth in Section 6 hereof is not satisfied 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 upon demand for all out-of-pocket expenses that shall have been
reasonably incurred by them in connection with the proposed purchase and sale of
the Bonds.
 
    9.  INDEMNIFICATION.  (a) The Company agrees to indemnify and hold harmless
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 Bonds
as originally filed or in any amendment thereof, or in the 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 for any legal or other expenses
as reasonably incurred by them in connection with investigating or defending any
such loss, claim, damages, liability or action; PROVIDED 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 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 use
therein and PROVIDED FURTHER that such indemnity with respect to a prospectus
included in the registration statement or any amendment thereto prior to the
supplementing thereof with the Prospectus Supplement shall not inure to the
benefit of any Underwriter (or any person controlling such Underwriter) from
whom the person asserting any such loss, claim, damage or liability purchased
the Bonds which are the subject thereof if such person was not sent or given a
copy of the Prospectus (but without the documents incorporated by reference
therein) at or prior to the confirmation of the sale of such Bonds to such
person in any case where such delivery is required by the Act and the untrue
statement or omission of a material fact contained in such prospectus was
corrected in the Prospectus, provided that the Company shall have delivered the
Prospectus, in a
 
                                       9
<PAGE>
timely manner and in sufficient quantities to permit such delivery by the
Underwriters. This indemnity agreement will be in addition to any liability
which the Company may otherwise have.
 
    (b) Each Underwriter severally agrees to indemnify and hold harmless the
Company, each of its directors, each of its officers who has signed the
Registration Statement and each person, if any, 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 the Underwriters but only with reference
to written information furnished to the Company by or on behalf of such
Underwriter through the Representatives specifically for use in the documents
referred to in the foregoing indemnity, and agrees to reimburse each such
indemnified party for any legal or other expenses reasonably incurred by them in
connection with investigating or defending any such loss, claim, damage,
liability or action. 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 9 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 9, notify the indemnifying party in writing of the commencement thereof;
but the omission to so notify the indemnifying party will not relieve it from
any liability which it may have to any indemnified party otherwise than under
this Section 9. In case any such action is brought against any indemnified
party, and it notifies the indemnifying party of the commencement thereof, the
indemnifying party will be entitled to participate therein, and, to the extent
that it may elect by written notice delivered to the indemnified party promptly
after receiving the aforesaid notice from such indemnified party, to assume the
defense thereof, with counsel satisfactory to such indemnified party; PROVIDED
THAT if the defendants in 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, the indemnified party, or parties shall have the right to
select separate counsel to assume such legal defenses and to otherwise
participate in the defense of such action on behalf of such indemnified party or
parties. Upon receipt of notice from the indemnifying party to such indemnified
party of its election so to assume the defense of such action and approval by
the indemnified party of counsel, the indemnifying party will not be liable to
such indemnified party under this Section 9 for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof unless (i) the indemnified party shall have employed separate counsel in
connection with the assertion of legal defenses in accordance with the proviso
to the next preceding sentence (it being understood, however, that the
indemnifying party shall not be liable for the expenses of more than one
separate counsel and one local counsel, approved by the Representatives in the
case of subparagraph (a), representing the indemnified parties under
subparagraphs (a) or (b), as the case may be, who are parties to such action),
(ii) 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 commencement of the action or (iii) the indemnifying party has
authorized the employment of counsel for the indemnified party at the expense of
the indemnifying party; and except that, if clause (i) or (iii) is applicable,
such liability shall be only in respect of the counsel referred to in such
clause (i) or (iii).
 
    (d) If the indemnification provided for in this Section 9 is unavailable to
or insufficient to hold harmless an indemnified party under subsection (a) or
(b) above in respect of any losses, claims, damages or liabilities (or actions
in respect thereof) referred to therein, then each indemnifying party shall
contribute to the amount paid or payable by such indemnified party as a result
of such losses, claims, damages or liabilities (or actions in respect thereof)
in such proportion as is appropriate to reflect the relative benefits received
by the Company on the one hand and the Underwriters on the other from the
offering of the Bonds. If, however, the allocation provided by the immediately
preceding sentence is not permitted by applicable law or if the indemnified
party failed to give the notice required under subsection (c) above, then each
indemnifying party shall contribute to such amount paid or payable by such
indemnified party in such proportion as is appropriate to reflect not only such
relative benefits but also the
 
                                       10
<PAGE>
relative fault of the Company on the one hand and the Underwriters on the other
in connection with the statements or omissions which resulted in such losses,
claims, damages or liabilities (or actions in respect thereof), as well as any
other relevant equitable considerations. The relative benefits received by the
Company on the one hand and the Underwriters on the other shall be deemed to be
in the same proportion as the total net proceeds from the offering (before
deducting expenses) received by the Company bear to the total underwriting
discounts and commissions received by the Underwriters, in each case as set
forth in the table on the cover page of the Prospectus Supplement. The relative
fault shall be determined by reference to, among other things, whether the
untrue or alleged untrue statement of a material fact or the omission or alleged
omission to state a material fact relates to information supplied by the Company
on the one hand or the Underwriters on the other and the parties' relative
intent, knowledge, access to information and opportunity to correct or prevent
such statement or omission. The Company and the Underwriters agree that it would
not be just and equitable if contributions pursuant to this subsection (d) were
determined by pro rata allocation (even if the Underwriters were treated as one
entity for such purpose) or by any other method of allocation which does not
take account of the equitable considerations referred to above in this
subsection (d). The amount paid or payable by an indemnified party as a result
of the losses, claims, damages or liabilities (or actions in respect thereof)
referred to above in this subsection (d) shall be deemed to include any legal or
other expenses reasonably incurred by such indemnified party in connection with
investigating or defending any such action or claim. Notwithstanding the
provisions of this subsection (d), no Underwriter shall be required to
contribute any amount in excess of the amount by which the total price at which
the Bonds underwritten by it and distributed to the public were offered to the
public exceeds the amount of any damages which such Underwriter has otherwise
been required to pay by reason of such untrue or alleged untrue statement or
omission or alleged omission. 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. The Underwriters' obligations in this subsection (d) to
contribute are several in proportion to their respective underwriting
obligations and not joint.
 
    (e) The obligations of the Company under this Section 9 shall be in addition
to any liability which the Company may otherwise have and shall extend, upon the
same terms and conditions, to each person, if any, who controls any Underwriter
within the meaning of the Act; and the obligations of the Underwriters under
this Section 9 shall be in addition to any liability which the respective
Underwriters may otherwise have and shall extend, upon the same terms and
conditions, to each officer and director of the Company and to each person, if
any, who controls the Company within the meaning of the Act.
 
    10.  DEFAULT BY AN UNDERWRITER.  (a) If any Underwriter shall default in its
obligation to purchase the Bonds which it has agreed to purchase hereunder (in
this Section called the "Unpurchased Bonds"), the Representatives may in their
discretion arrange for themselves or another party or other parties to purchase
such Unpurchased Bonds on the terms contained herein. If within thirty-six hours
after such default by any Underwriter the Representatives do not arrange for the
purchase of such Unpurchased Bonds, then the Company shall be entitled to a
further period of thirty-six hours within which to procure another party or
other parties satisfactory to the Representatives to purchase such Unpurchased
Bonds on such terms. In the event that, within the respective prescribed period,
the Representatives notify the Company that they have so arranged for the
purchase of such Unpurchased Bonds, or the Company notifies the Representatives
that it has so arranged for the purchase of such Unpurchased Bonds, the
Representatives or the Company shall have the right to postpone the Closing Date
for such Unpurchased Bonds for a period of not more than seven days, in order to
effect whatever changes may thereby be made necessary in the Registration
Statement or the Prospectus as amended or supplemented, or in any other
documents or arrangements, and the Company agrees to file promptly any
amendments or supplements to the Registration Statement or the Prospectus which
in the opinion of the Representatives may thereby be made necessary. The term
"Underwriter" as used in this Agreement shall include any person substituted
under this Section with like effect as if such person had originally been a
party to this Agreement with respect to such Unpurchased Bonds.
 
                                       11
<PAGE>
    (b) If, after giving effect to any arrangements for the purchase of the
Unpurchased Bonds of a defaulting Underwriter or Underwriters by the
Representatives and the Company as provided in subsection (a) above, the
aggregate principal amount of such Unpurchased Bonds which remains unpurchased
does not exceed one-eleventh of the aggregate principal amount of the Bonds,
then the Company shall have the right to require each non-defaulting Underwriter
to purchase the principal amount of Bonds which such Underwriter agreed to
purchase hereunder and, in addition, to require each non-defaulting Underwriter
to purchase its pro rata share (based on the principal amount of Bonds which
such Underwriter agreed to purchase hereunder) of the Unpurchased Bonds of such
defaulting Underwriter or Underwriters for which such arrangements have not been
made; but nothing herein shall relieve a defaulting Underwriter from liability
for its default.
 
    (c) If, after giving effect to any arrangements for the purchase of the
Unpurchased Bonds of a defaulting Underwriter or Underwriters by the
Representatives and the Company as provided in subsection (a) above, the
aggregate principal amount of Unpurchased Bonds which remains unpurchased
exceeds one-eleventh of the aggregate principal amount of the Bonds, as referred
to in subsection (b) above, or if the Company shall not exercise the right
described in subsection (b) above to require non-defaulting Underwriters to
purchase Unpurchased Bonds of a defaulting Underwriter or Underwriters, then
this Agreement shall thereupon terminate, without liability on the part of any
non-defaulting Underwriter or the Company, except for the expenses to be borne
by the Company and the Underwriters as provided in Section 5 hereof and the
indemnity and contribution agreements in Section 9 hereof; but nothing herein
shall relieve a defaulting Underwriter from liability for its default.
 
    11.  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 all Bonds, if prior to such time (i) 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) if
a banking moratorium shall have been declared either by Federal, Minnesota or
New York State authorities, (iii) if trading in any securities of the Company
shall have been suspended or halted, or (iv) if there shall have occurred any
outbreak or escalation of hostilities involving the United States or the
declaration by the United States of a war or national emergency or any other
calamity or crisis the effect of which on the financial markets in the United
States is such as to make it, in the judgment of the Representatives,
impracticable or inadvisable to proceed with the public offering or delivery of
the Bonds on the terms and in the manner contemplated in the Prospectus.
 
    12.  REPRESENTATIONS AND INDEMNITIES TO SURVIVE DELIVERY.  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
their respective officers, directors or controlling persons within the meaning
of the Act, and will survive delivery of and payment for the Bonds. The
provisions of Sections 5, 8 and 9 hereof shall survive the termination or
cancellation of this Agreement.
 
    13.  NOTICES.  All communications hereunder will be in writing and, if sent
to the Representatives, will be mailed, delivered or transmitted and confirmed
to them at their address set forth for that purpose in Schedule 1 hereto or, if
sent to the Company, will be mailed, delivered or transmitted and confirmed to
it at 414 Nicollet Mall, Minneapolis, Minnesota 55401, attention Secretary.
 
    14.  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 9 hereof, and no other
person will have any right or obligation hereunder.
 
    15.  APPLICABLE LAW.  This Agreement will be governed by and construed in
accordance with the laws of the State of Minnesota.
 
                                       12
<PAGE>
    16.  COUNTERPARTS.  This Agreement may be executed in counterparts, all of
which, taken together, shall constitute a single agreement among the parties to
such counterparts.
 
    17.  REPRESENTATION OF THE UNDERWRITERS.  The Representatives represent and
warrant to the Company that they are authorized to act as the representatives of
the Underwriters in connection with this financing and that the Representatives'
execution and delivery of this Agreement and any action under this Agreement
taken by such Representatives will be binding upon all Underwriters.
 
    18.  OTHER.  Time shall be of the essence for all purposes of this
Agreement. As used herein, "business day" shall mean any day when the
Commission's office in Washington D.C. is open for business.
 
    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,
                                  NORTHERN STATES POWER COMPANY
                                  By    /s/
                                     ...........................................
 
                                                    Vice President
 
The foregoing Agreement is hereby
confirmed
  and accepted as of the date first
above written.
         SALOMON BROTHERS INC
By    /s/
   ...................................
 
   FOR ITSELF OR THEMSELVES AND AS
   REPRESENTATIVES OF
   THE SEVERAL UNDERWRITERS, IF ANY,
   NAMED IN
   SCHEDULE II TO THE FOREGOING
   AGREEMENT.
 
                                       13
<PAGE>
                                   SCHEDULE I
 
Underwriting Agreement dated March 11, 1998
 
Registration Statement No. 33-63243
 
Representatives and Addresses:  Salomon Brothers Inc
                            Seven World Trade Center
                            New York, New York 10048
 
Bonds:
 
   Designation: 5 7/8% First Mortgage Bonds, Series due March 1, 2003
 
   Principal Amount:   $100,000,000
 
   Supplemental Indenture dated as of March 1, 1998
 
   Date of Maturity: March 1, 2003
 
   Interest Rate:  5 7/8% per annum, payable March 1 and September 1 of each
                   year, commencing September 1, 1998
 
   Purchase Price:  99.653% of the principal amount thereof, plus accrued
interest from
                  March 1, 1998 to the date of payment and delivery.
 
   Public Offering Price:   99.848% of the principal amount thereof, plus
                            accrued interest from March 1, 1998 to the date of
                            payment and delivery.
Payment to be made in federal (same day) funds. _X_ Yes    ___ No
 
Closing Date and Location: March 17, 1998
                        Northern States Power Company
                        414 Nicollet Mall
                        Minneapolis, MN 55401
 
Office for Delivery of Bonds: The Depository Trust Company
                         55 Water Street
                         19th Floor
                         New York, New York 10041
 
Office for Payment of Bonds: Northern States Power Company
                         414 Nicollet Mall
                         Minneapolis, MN 55401
 
Office for Checking of Bonds: The Depository Trust Company
                         55 Water Street
                         19th Floor
                         New York, New York 10041
 
                                       14
<PAGE>
                                  SCHEDULE II
 
<TABLE>
<CAPTION>
NAME                                                                                                    AMOUNT
- --------------------------------------------------------------------------------------------------  --------------
<S>                                                                                                 <C>
Salomon Brothers Inc..............................................................................  $   17,500,000
ABN Amro..........................................................................................      16,500,000
BancAmerica.......................................................................................      16,500,000
Bear Stearns & Co. Inc............................................................................      16,500,000
Chase Securities Inc..............................................................................      16,500,000
Nationsbanc.......................................................................................      16,500,000
                                                                                                    --------------
        Total.....................................................................................  $  100,000,000
                                                                                                    --------------
                                                                                                    --------------
</TABLE>
 
                                       15
<PAGE>
                                                                       EXHIBIT A
 
                       FORM OF OPINION OF GARY R. JOHNSON
      RE: $           PRINCIPAL AMOUNT OF FIRST MORTGAGE BONDS, SERIES DUE
                                           ,    %
           OF NORTHERN STATES POWER COMPANY, A MINNESOTA CORPORATION.
 
Gentlemen:
 
    For the purpose of rendering this opinion, I have examined the proceedings
taken by Northern States Power Company, a Minnesota corporation, herein called
the "Company," with respect to the issue and sale by the Company of $
principal amount of First Mortgage Bonds, Series due              ,    % herein
called the "Bonds." In connection therewith I have participated in the
preparation of the proceedings for the issuance and sale of the Bonds including
the Underwriting Agreement dated                  , between you and the Company
relating to your purchase of the Bonds, herein called the "Agreement," and have
either participated in the preparation of or examined the Trust Indenture dated
February 1, 1937, and the Supplemental Trust Indentures thereto and the
Supplemental Trust Indenture dated as of                  , creating the Bonds,
all from the Company to Harris Trust and Savings Bank, as Trustee (which Trust
Indenture and Supplemental Trust Indentures are herein collectively called the
"Indenture"). I also have participated in the preparation of or examined the
registration statement and any amendments thereto and the accompanying
prospectuses and any supplements thereto, as filed under the Securities Act of
1933, as amended (the "Act"), with respect to the Bonds. Whenever the terms
"Registration Statement" or "Prospectus" are used herein, they shall have the
respective meanings set forth in the Agreement. My examination has extended to
all statutes, records, instruments, and documents which I have deemed necessary
to examine for the purposes of this opinion.
 
    I am of the opinion that:
 
        1. The Company is a legally existing corporation under the laws of the
    State of Minnesota; has corporate power, right, and authority to do business
    and to own property in the states of Minnesota, North Dakota, and South
    Dakota in the manner and as set forth in the Prospectus; has corporate
    power, right and authority to own securities of its subsidiaries; and has
    corporate power, right, and authority to make the Indenture and issue and
    sell the Bonds;
 
        2. The authorized capital stock of the Company is as set forth in the
    Prospectus and all of the issued shares of capital stock of the Company have
    been duly authorized and validly issued and are fully paid and
    non-assessable;
 
        3. Each Significant Subsidiary, as defined in the Agreement, of the
    Company has been duly incorporated and is validly existing as a corporation
    in good standing under the laws of the jurisdiction of its incorporation and
    is duly qualified as a foreign corporation to transact business and is in
    good standing in each jurisdiction in which it owns or leases substantial
    properties or in which the conduct of its business requires such
    qualification; all of the issued and outstanding capital stock of each
    subsidiary has been duly authorized and validly issued and is fully paid and
    non-assessable; and the capital stock of each such subsidiary owned by the
    Company, directly or through subsidiaries, is owned free and clear of any
    pledge, lien, encumbrance, claim or equity;
 
        4. The Agreement has been duly authorized, executed, and delivered by
    the Company and is a valid and binding obligation of the Company, except to
    the extent that the provisions for indemnities may be held to be
    unenforceable as against public policy;
 
        5. The Indenture has been duly authorized by appropriate corporate
    proceedings on the part of the Company, has been duly executed and delivered
    and constitutes a legal, valid, and binding instrument enforceable in
    accordance with its terms, except as the provisions of the United States
    Bankruptcy Code may affect the validity of the lien thereof with respect to
    proceeds, products, rents,
 
                                       1
<PAGE>
    issues, or profits realized, and additional property acquired, after the
    commencement of a case under said Code, and except as enforcement of the
    provisions of the Indenture may be limited by the laws of the states of
    Minnesota, North Dakota, and South Dakota (where property covered thereby is
    located) affecting the remedies for the enforcement of the security provided
    for in the Indenture (which state laws do not in my opinion make such
    remedies inadequate for realization of the benefits of such security) or
    except as the same may be limited by bankruptcy or insolvency laws or other
    similar laws;
 
        6. The issuance of the Bonds in accordance with the terms of the
    Indenture and the sale and delivery thereof pursuant to the provisions of
    the Agreement have been duly authorized by the Company; the statements made
    under the captions "Description of New Bonds" and "Supplemental Description
    of Offered Bonds" in the Prospectus, insofar as they purport to summarize
    provisions of documents specifically referred to therein, fairly present the
    information called for with respect thereto by Form S-3; the Bonds are in
    due legal form, constitute legal, valid, and binding obligations of the
    Company, and (subject to the qualifications expressed in paragraph 5 above
    with respect to the validity and enforceability of certain of the provisions
    of the Indenture) and enforceable in accordance with their terms;
 
        7. The consummation of the transactions contemplated in the Agreement
    and the fulfillment of the terms thereof and compliance by the Company with
    all the terms and provisions of the Indenture will not result in a breach of
    any of the terms or provisions of, or constitute a default under, any
    indenture, mortgage, deed of trust or other agreement or instrument known to
    me to which the Company is a party or by which it is bound, or the Restated
    Articles of Incorporation, as amended, or by-laws of the Company or, to the
    best of my knowledge, any order, rule or regulation applicable to the
    Company of any court or of any Federal or state regulatory body or
    administrative agency or other governmental body having jurisdiction over
    the Company or its property;
 
        8. The Registration Statement has become effective under the Act. The
    Prospectus Supplement (as defined in the Agreement) has been filed pursuant
    to Rule 424(b) under the Act, and no proceedings for a stop order have been
    instituted or to the knowledge of such counsel are pending or threatened
    under Section 8(d) of the Act; the Minnesota Public Utilities Commission has
    issued its order approving the Company's capital structure which order
    authorizes the issuance of the Bonds; the Indenture has been duly qualified
    under the Trust Indenture Act of 1939, as amended (the "Trust Indenture
    Act"); and no further approval of, authorization, consent, certificate or
    order of any governmental body, federal, state or other, is required in
    connection with the issuance and sale of the Bonds by the Company to you as
    provided in the Agreement, except as may be required by state securities
    laws;
 
        9. At the time the Registration Statement became effective, the
    Registration Statement (other than the financial statements and supporting
    schedules included or incorporated by reference therein, as to which no
    opinion is being expressed) complied as to form in all material respects
    with the requirements of the Act, the rules and regulations thereunder, the
    Trust Indenture Act and the rules and regulations thereunder;
 
        10. I do not know of any legal or governmental proceedings required to
    be described in the Prospectus which are not described as required nor of
    any contracts or documents of a character required to be described in the
    Registration Statement or Prospectus or to be filed as exhibits to the
    Registration Statement which are not described and filed as required;
 
        11. The Indenture is in proper form, conforming to the laws of the
    States of Minnesota, North Dakota, and South Dakota, to give and create the
    lien which it purports to create and has been and now is duly and properly
    recorded or filed in all places necessary to effectuate the lien of the
    Indenture;
 
        12. The Company has good and valid title to all real and fixed property
    and leasehold rights described or enumerated in the Indenture (except such
    properties as have been released from the lien thereof in accordance with
    the terms thereof), subject only to: (a) taxes and assessments not yet
 
                                       2
<PAGE>
    delinquent; (b) the lien of the Indenture; (c) as to parts of the Company's
    property, certain easements, conditions, restrictions, leases, and similar
    encumbrances which do not affect the Company's use of such property in the
    usual course of its business, certain minor defects in titles which are not
    material, defects in titles to certain properties which are not essential to
    the Company's business; and mechanics' lien claims being contested or not of
    record or for the satisfaction or discharge of which adequate provision has
    been made by the Company pursuant to the Indenture;
 
        13. The Bonds are secured by and entitled to the benefits of the
    Indenture equally and ratably, except as to sinking fund provisions, with
    all other bonds duly issued and outstanding under the Indenture by a valid
    and direct first mortgage lien of the Indenture on all of the real and fixed
    properties, leasehold rights, franchises, and permits now owned by the
    Company, subject only to the items set forth in the preceding paragraph 12
    of this opinion;
 
        14. The Bonds also are secured equally and ratably, except as to sinking
    fund provisions, with all other bonds duly issued and outstanding under the
    Indenture by a valid and direct first mortgage lien (subject to permitted
    liens as defined in the Indenture) on all real and fixed property hereafter
    acquired by the Company in conformity with the terms of the Indenture,
    except as the United States Bankruptcy Code may affect the validity of the
    lien of such Indenture on property acquired after the commencement of a case
    under such Act, except as to the prior lien of the Trustee under the
    Indenture in certain events specified therein, and except as otherwise
    provided in the Indenture in the case of consolidation, merger, or transfer
    of all the mortgaged and pledged property as an entirety;
 
        15. The Company has all necessary power under statutory provisions,
    franchises (which expire at various dates), or permits to serve the
    customers in the jurisdictions where it provided electric and gas service,
    except in certain instances that are not material to the Company; and
 
        16. All statements contained in the Registration Statement and
    Prospectus under the caption "Description of New Bonds" purporting to set
    forth the opinion of counsel or purporting to be based upon the opinion of
    counsel correctly set forth my opinion on said respective matters.
 
    These opinions do not cover titles to easements for water flowage purposes
or rights of way for electric and gas transmission and distribution facilities,
steam mains, and telephone lines. However, the Company has the power of eminent
domain in the states in which it operates.
 
    In the course of my participation in the preparation of the Registration
Statement and Prospectus I made investigations as to the accuracy of certain of
the statements of fact contained therein, I discussed other matters with
officers, employees, and representatives of the Company, and I examined various
corporate records and data. While I do not pass upon or assume responsibility
for, and shall not be deemed to have independently verified, the accuracy and
completeness of the statements contained in the Registration Statement or
Prospectus (except as to matters set forth in paragraphs 9 and 16 above) nothing
has come to my attention that would lead me to believe that the Registration
Statement at the time it became effective contained an untrue statement of a
material fact or omitted to state a material fact required to be stated therein
or necessary to make the statements therein not misleading or that the
Prospectus as of the date of the Agreement or at the date hereof contained an
untrue statement of a material fact or omitted to state a material fact
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not misleading.
 
                                       3
<PAGE>
    In giving my opinion under paragraph 12 above, I have relied upon
examinations of abstracts of titles to properties of the Company, said abstracts
bearing various dates, and nothing has come to my attention which would lead me
to believe that anything has occurred since the dates of the abstracts which
would adversely affect the titles shown on the abstracts. In giving opinions as
to conformity to the laws of States other than Minnesota and as to the
franchises and titles to property of the Company, I have in certain instances
relied upon the opinion of other counsel employed or retained by the Company to
render opinions in respect thereto.
 
                                        Respectfully submitted,
 
                                        By
                                        ----------------------------------------
 
                                                     Gary R. Johnson
                                            Vice President and General Counsel
                                              Northern States Power Company
 
                                       4

<PAGE>
                         NORTHERN STATES POWER COMPANY
                           (A MINNESOTA CORPORATION)
                              FIRST MORTGAGE BONDS
                             UNDERWRITING AGREEMENT
 
To the Representatives named in Schedule I
  hereto of the Underwriters named in
  Schedule II hereto
 
Dear Sirs:
 
    Northern States Power Company, a Minnesota corporation (the "Company"),
proposes to sell to the underwriters named in Schedule II hereto (the
"Underwriters"), for whom you are acting as representatives (the
"Representatives"), its First Mortgage Bonds of the designation, with the terms
and in the aggregate principal amount specified in Schedule I hereto (the
"Bonds") to be issued under its Trust Indenture, dated as of February 1, 1937,
from the Company to Harris Trust and Savings Bank, as trustee (the "Trustee"),
as heretofore supplemented and amended by supplemental trust indentures and as
to be further supplemented and amended by a supplemental trust indenture
relating to the Bonds (such Trust Indenture as so supplemented and amended and
as to be so supplemented and amended being hereinafter referred to as the
"Indenture"). If the firm or firms listed in Schedule II hereto include only the
firm or firms listed in Schedule I hereto, then the terms "Underwriters" and
"Representatives," as used herein, shall each be deemed to refer to such firm or
firms.
 
    Concurrently with the offering of the Bonds, the Company proposes to issue
and sell $100,000,000 of its 5 7/8% First Mortgage Bonds, Series due March 1,
2003 (the "Additional Bonds"). The Additional Bonds also will be issued under
the Indenture. The sale of the Bonds and the Additional Bonds are not contingent
upon each other.
 
    1.  REPRESENTATIONS AND WARRANTIES BY THE COMPANY.  The Company represents
and warrants to, and agrees with, each Underwriter that:
 
        (a) The Company meets the requirements for use of Form S-3 under the
    Securities Act of 1933, as amended (the "Act") and has filed with the
    Securities and Exchange Commission (the "Commission") a registration
    statement on such Form, including a prospectus, for the registration under
    the Act of the Bonds and the Additional Bonds, which registration statement
    has become effective. Such registration statement and prospectus may have
    been amended or supplemented from time to time prior to the date of this
    Agreement (which date is set forth in Schedule I hereto). Any such amendment
    or supplement was filed with the Commission and any such amendment has
    become effective. The Company will file with the Commission a prospectus
    supplement (the "Prospectus Supplement") relating to the Bonds pursuant to
    Rule 424 and/or Rule 434 under the Act. Copies of such registration
    statement and prospectus, any such amendment or supplement and all documents
    incorporated by reference therein which were filed with the Commission on or
    prior to the date of this Agreement have been delivered to you and copies of
    the Prospectus Supplement will be delivered to you promptly after it is
    filed with the Commission. Such registration statement, as amended prior to
    the date of this Agreement, and such prospectus, as amended and supplemented
    prior to the date of this Agreement and as supplemented by the Prospectus
    Supplement, are hereinafter called the "Registration Statement" and the
    "Prospectus", respectively. Any reference herein to the Registration
    Statement or the 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 Securities Exchange Act
 
                                       1
<PAGE>
    of 1934, as amended (the "Exchange Act") on or before the date of this
    Agreement and, if the Company files any document pursuant to the Exchange
    Act after the date of this Agreement and prior to the termination of the
    offering of the Bonds by the Underwriters, which documents are deemed to be
    incorporated by reference into the Prospectus, the term "Prospectus" shall
    refer also to said prospectus as supplemented by the documents so filed from
    and after the time said documents are filed with the Commission. There are
    no contracts or documents of the Company or any of its subsidiaries that are
    required to be filed as exhibits to the Registration Statement or any
    documents incorporated by reference therein by the Act, the Exchange Act or
    the rules and regulations thereunder which have not been so filed.
 
        (b) No order preventing or suspending the use of the Prospectus or the
    Registration Statement has been issued by the Commission and the
    Registration Statement, at the date of this Agreement, complied in all
    material respects with the requirements of the Act, the Trust Indenture Act
    of 1939, as amended (the "Trust Indenture Act") and the respective rules and
    regulations of the Commission thereunder and did not contain any untrue
    statement of a material fact or omit any material fact required to be stated
    therein or necessary in order to make the statements therein not misleading;
    and, at the time the Prospectus Supplement is filed with the Commission and
    at the Closing Date (as hereinafter defined), the Prospectus will comply in
    all material respects with the Act and the rules and regulations of the
    Commission thereunder and will not contain any untrue statement of a
    material fact or omit to state any material fact required to be stated
    therein or necessary to make the statements therein not misleading; PROVIDED
    that the Company makes no representations or warranties as to (A) that part
    of the Registration Statement which shall constitute the Statement of
    Eligibility (Form T-1) under the Trust Indenture Act of the Trustee or (B)
    the information contained in or omitted from the Registration Statement or
    the Prospectus 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 use in the Registration Statement or
    Prospectus.
 
        (c) The documents incorporated by reference in the Prospectus, when they
    were filed with the Commission, conformed in all material respects to the
    requirements of the Exchange Act and the rules and regulations of the
    Commission thereunder, and any documents so filed and incorporated by
    reference subsequent to the date of this Agreement will, when they are filed
    with the Commission, conform in all material respects to the requirements of
    the Exchange Act, and the rules and regulations of the Commission
    thereunder; and none of such documents include or will include any untrue
    statement of a material fact or omit or will omit to state any material fact
    required to be stated therein or necessary to make the statements therein in
    the light of the circumstances under which they were made not misleading.
 
        (d) Deloitte & Touche LLP and Price Waterhouse LLP which audited certain
    of the financial statements incorporated by reference in the Registration
    Statement, are each independent public accountants as required by the Act
    and the rules and regulations of the Commission thereunder.
 
        (e) The financial statements of the Company and its consolidated
    subsidiaries filed as a part of or incorporated by reference in the
    Registration Statement or Prospectus fairly present the financial position
    of the Company and its consolidated subsidiaries as of the dates indicated
    and the results of their operations and changes in financial position for
    the periods specified, and have been prepared in conformity with generally
    accepted accounting principles applied on a consistent basis throughout the
    periods involved, except as disclosed in the Prospectus Supplement.
 
        (f) The Company has been duly incorporated and is validly existing as a
    corporation in good standing under the laws of the State of Minnesota with
    due corporate authority to carry on the business in which it is engaged and
    to own and operate the properties used by it in such business, as described
    in the Prospectus; the Company is qualified to do business as a foreign
    corporation and is in good standing under the laws of the States of North
    Dakota and South Dakota; and the Company is
 
                                       2
<PAGE>
    not required by the nature of its business to be licensed or qualified as a
    foreign corporation in any other state or jurisdiction; and, except as set
    forth in the Prospectus Supplement, the Company has all material licenses
    and approvals required at the date hereof to conduct its business.
 
        (g) Each subsidiary of the Company named in Exhibit 21.01 to the
    Company's most recent Annual Report on Form 10-K ("Significant Subsidiary")
    has been duly incorporated and is validly existing as a corporation in good
    standing under the laws of the jurisdiction of its incorporation and is duly
    qualified as a foreign corporation to transact business and is in good
    standing in each jurisdiction in which it owns or leases substantial
    properties or in which the conduct of its business requires such
    qualification; all of the issued and outstanding capital stock of each such
    subsidiary has been duly authorized and validly issued and is fully paid and
    non-assessable; and the capital stock of each such subsidiary owned by the
    Company, directly or through subsidiaries, is owned free and clear of any
    pledge, lien, encumbrance, claim or equity.
 
        (h) Neither the Company nor any of its subsidiaries has sustained since
    the date of the latest audited financial statements included or incorporated
    by reference in the Prospectus any material loss or interference with its
    business from fire, explosion, flood or other calamity, whether or not
    covered by insurance, or from any labor dispute or court or governmental
    action, order or decree, otherwise than as set forth or contemplated in the
    Prospectus Supplement; and, since the respective dates as of which
    information is given in the Registration Statement and the Prospectus
    Supplement, neither the Company nor any of its subsidiaries has incurred any
    liabilities or obligations, direct or contingent, or entered into any
    transactions, not in the ordinary course of business, which are material to
    the Company and its subsidiaries, and there has not been any material change
    in the capital stock or long-term debt of the Company or any of its
    subsidiaries or any material adverse change, or any development involving a
    prospective material adverse change, in or affecting the general affairs,
    management, financial position, stockholders' equity or results of
    operations of the Company and its subsidiaries, otherwise than as set forth
    or contemplated in the Prospectus Supplement.
 
        (i) Neither the execution and delivery of this Agreement and the
    Indenture, the issuance and delivery of the Bonds, the consummation of the
    transactions herein contemplated, the fulfillment of the terms hereof, nor
    compliance with the terms and provisions of this Agreement, the Bonds and
    the Indenture will conflict with, or result in the breach of, any of the
    terms, provisions or conditions of the Restated Articles of Incorporation,
    as amended, or by-laws of the Company, or of any contract, agreement or
    instrument to which the Company is a party or in which the Company has a
    beneficial interest or by which the Company is bound or of any order, rule
    or regulation applicable to the Company of any court or of any federal or
    state regulatory body or administrative agency or other governmental body
    having jurisdiction over the Company or over its properties.
 
        (j) The Bonds have been duly authorized for issuance and sale pursuant
    to this Agreement and, when executed and authenticated in accordance with
    the Indenture and delivered and paid for as provided herein, will be duly
    issued and will constitute valid and binding obligations of the Company
    enforceable in accordance with their terms, except as limited by bankruptcy,
    insolvency and other laws affecting enforcement of creditors' rights, and
    will be entitled to the benefits of the Indenture which will be
    substantially in the form heretofore delivered to you.
 
        (k) The Indenture has been duly and validly authorized by the Company
    and, when duly executed and delivered by the Company, assuming due
    authorization, execution and delivery thereof by the Trustee, will
    constitute a valid and binding obligation of the Company enforceable in
    accordance with its terms, except as enforcement thereof may be limited by
    bankruptcy, insolvency or other laws affecting enforcement of creditors'
    rights.
 
        (l) The Minnesota Public Utilities Commission has issued its order
    approving capital structure which order authorizes the issuance of the
    Bonds, and no other approval of any regulatory public body, state or
    federal, is, or will be at the Closing Date (as hereinafter defined),
    necessary in
 
                                       3
<PAGE>
    connection with the issuance and sale of the Bonds pursuant to this
    Agreement, other than approvals that may be required under state securities
    laws.
 
       (m) The Company has good and valid title to all real and fixed property
    and leasehold rights described or enumerated in the Indenture (except such
    properties as have been released from the lien thereof in accordance with
    the terms thereof), subject only to taxes and assessments not yet
    delinquent; the lien of the Indenture; as to parts of the Company's
    property, certain easements, conditions, restrictions, leases, and similar
    encumbrances which do not affect the Company's use of such property in the
    usual course of its business, and certain minor defects in titles which are
    not material, and defects in titles to certain properties which are not
    essential to the Company's business; and mechanics' lien claims being
    contested or not of record or for the satisfaction or discharge of which
    adequate provision has been made by the Company pursuant to the Indenture;
    and any real property and buildings held under lease by the Company is held
    by it under valid, subsisting and enforceable leases with such exceptions as
    are not material and do not interfere with the use made and proposed to be
    made of such property and buildings by the Company.
 
        (n) Other than as set forth or contemplated in the Prospectus as of the
    date hereof, there are no legal or governmental proceedings pending to which
    the Company or any of its subsidiaries is a party or of which any property
    of the Company or any of its subsidiaries is the subject which, if
    determined adversely to the Company or any of its subsidiaries, would
    individually or in the aggregate have a material adverse effect on the
    consolidated financial position, stockholders' equity or results of
    operations of the Company and its subsidiaries; and, to the best of the
    Company's knowledge, no such proceedings are threatened or contemplated by
    governmental authorities or threatened by others.
 
        (o) The Company is not an "investment company" or an entity "controlled"
    by an "investment company," as such terms are defined in the Investment
    Company Act of 1940, as amended.
 
        (p) Except as set forth in the Prospectus Supplement, the Company and
    its subsidiaries (A) are in compliance with any and all applicable 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"), (B) have received
    all permits, licenses or other approvals required of them under applicable
    Environmental Laws to conduct its respective business and (C) are in
    compliance with all terms and conditions of any such permits, licenses or
    approvals, except where such noncompliance with Environmental Laws, failure
    to receive required permits, licenses or other approvals or failure to
    comply with the terms and conditions of such permits, licenses or approvals
    would not, singly or in the aggregate, have a material adverse effect on the
    Company and its subsidiaries, taken as a whole.
 
    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 the Representatives and each other Underwriter, and the Representatives
and each other Underwriter agree, severally and not jointly, to purchase from
the Company, at the purchase price set forth in Schedule I hereto, the
respective principal amounts of the Bonds set forth opposite their respective
names in Schedule II hereto.
 
    3.  DELIVERY AND PAYMENT.  Delivery of and payment for the Bonds shall be
made at the place, date and time specified in Schedule I hereto (or such other
place, date and time not later than eight full business days thereafter as the
Representatives and the Company shall designate), which date and time may be
postponed by agreement between the Representatives and the Company (such date
and time being herein called the "Closing Date"). Delivery of the Bonds 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 certified or official bank check or checks payable in New York
Clearing House (next day) funds or, if so indicated in Schedule I hereto, in
federal (same day) funds. The Bonds will be delivered in definitive registered
form except that, if for any reason the Company is unable to deliver the Bonds
in definitive form, the Company
 
                                       4
<PAGE>
reserves the right, as provided in the Indenture, to make delivery in temporary
form. Any Bonds delivered in temporary form will be exchangeable without charge
for Bonds in definitive form. The Bonds will be registered in the names of the
Underwriters and in the principal amounts set forth in Schedule II hereto except
that if the Company receives a written request from the Representatives prior to
noon on the second business day preceding the Closing Date giving the names in
which the Bonds are to be registered and the principal amounts thereof (which
shall in each case be a multiple of $1,000) the Company will deliver the Bonds
so registered. The Bonds will be made available to the Representatives for
checking in New York, New York, not later than 2:00 p.m., New York City time, on
the business day preceding the Close Date.
 
    4.  AGREEMENTS.  The Company agrees with the several Underwriters that:
 
        (a) With the consent of the Representatives, the Company will cause the
    Prospectus Supplement to be filed pursuant to Rule 424 (b) and/or Rule 434
    under the Act and will notify the Representatives promptly of such filing.
    During the period for which a prospectus relating to the Bonds is required
    to be delivered under the Act, the Company will promptly advise the
    Representatives (i) when any amendment to the Registration Statement shall
    have become effective, (ii) when any subsequent supplement to the Prospectus
    (including documents deemed to be incorporated by reference into the
    Prospectus) has been filed, (iii) of any request by the Commission for any
    amendment of or supplement to the Registration Statement or the Prospectus
    or for any additional information, and (iv) of the issuance by the
    Commission of any stop order suspending the effectiveness of the
    Registration Statement or the institution or threatening of any proceedings
    for that purpose. The Company will not file any amendment of the
    Registration Statement or supplement to the Prospectus (including documents
    deemed to be incorporated by reference into the Prospectus) unless the
    Company has furnished to the Representatives a copy for your review prior to
    filing and will not file any such proposed amendment or supplement to which
    the Representatives reasonably object. The Company will use its best efforts
    to prevent the issuance of any such stop order and, if issued, to obtain as
    soon as possible the withdrawal thereof.
 
        (b) If, at any time when a prospectus relating to the Bonds is required
    to be delivered under the Act, any event occurs as a result of which the
    Prospectus as then amended or 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 at any time to
    amend or supplement the Prospectus to comply with the Act or the Exchange
    Act or the respective rules and regulations of the Commission thereunder,
    the Company promptly, subject to paragraph (a) of this Section 4, will
    prepare and file an amendment or supplement to the Prospectus with the
    Commission or will make a filing with the Commission pursuant to Section 13
    or 14 of the Exchange Act, which will correct such statement or omission or
    will effect such compliance.
 
        (c) The Company will make generally available to its security holders
    and to the Representatives a consolidated earnings statement (which need not
    be audited) of the Company, for a twelve-month period beginning after the
    date of the Prospectus Supplement filed pursuant to Rule 424(b) and/or Rule
    434 under the Act, as soon as is reasonably practicable after the end of
    such period, but in any event no later than eighteen months after the
    "effective date of the Registration Statement" (as defined in Rule 158(c)
    under the Act), which will satisfy the provision of Section 11(a) of the Act
    and the rules and regulations of the Commission thereunder (including at the
    option of the Company, Rule 158).
 
        (d) The Company will furnish to each of the Representatives a signed
    copy of the Registration Statement as originally filed and of each amendment
    thereto, including the Form T-1 of the Trustee and all powers of attorney,
    consents and exhibits filed therewith (other than exhibits incorporated by
    reference), and will deliver to the Representatives conformed copies of the
    Registration Statement,
 
                                       5
<PAGE>
    the Prospectus (including all documents incorporated by reference therein)
    and, so long as delivery of a prospectus by an Underwriter or dealer may be
    required by the Act, all amendments of and supplements to such documents, in
    each case as soon as available and in such quantities as the Representatives
    may reasonably request.
 
        (e) The Company will furnish such information, execute such instruments
    and take such action as may be required to qualify the Bonds 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 Bonds; PROVIDED that the Company shall not be required
    to qualify to do business in any jurisdiction where it is not now so
    qualified or to take any action which would subject it to general or
    unlimited service of process in any jurisdiction where it is not now so
    subject.
 
        (f) So long as the Bonds are outstanding, the Company will furnish (or
    cause to be furnished) to each of the Representatives, upon request, copies
    of (i) all reports to stockholders of the Company and (ii) all reports and
    financial statements filed with the Commission or any national securities
    exchange.
 
        (g) During the period beginning from the date of this Agreement and
    continuing to the Closing Date, the Company will not offer, sell, or
    otherwise dispose of any first mortgage bonds of the Company (except the
    Additional Bonds and except under prior contractual commitments which have
    been disclosed to you), without the prior written consent of the
    Representatives, which consent shall not be unreasonably withheld.
 
    5.  EXPENSES.  Whether or not the transactions contemplated hereunder are
consummated or this Agreement is terminated, the Company will pay all costs and
expenses incident to the performance of the obligations of the Company
hereunder, including, without limiting the generality of the foregoing, all
costs, taxes and expenses incident to the issue and delivery of the Bonds to the
Underwriters, all fees and expenses of the Company's counsel and accountants,
all costs and expenses incident to the preparing, printing and filing of the
Registration Statement (including all exhibits thereto), the Prospectus
(including all documents incorporated by reference therein) and any amendments
thereof or supplements thereto, all costs and expenses (including fees and
expenses of counsel) incurred in connection with "blue sky" qualifications, the
determination of the legality of the Bonds for investment by institutional
investors and the rating of the Bonds, and all costs and expenses of the
printing and distribution of all documents in connection with this underwriting.
Except as provided in this Section 5 and Section 8 hereof, the Underwriters will
pay all their own costs and expenses, including the fees of their counsel and
any advertising expenses in connection with any offer they may make.
 
    6.  CONDITIONS TO THE OBLIGATIONS OF THE UNDERWRITERS.  The obligations of
the Underwriters to purchase the Bonds shall be subject, in the discretion of
the Representatives, to the accuracy of the representations and warranties on
the part of the Company contained herein as of the date hereof and the Closing
Date, to the accuracy of the statements of Company officers made in any
certificates given pursuant to the provisions hereof, to the performance by the
Company of its obligations hereunder and to the following additional conditions:
 
        (a) The Prospectus Supplement relating to the Bonds shall have been
    filed with the Commission pursuant to Rule 424(b) and/or Rule 434 within the
    applicable time period prescribed for such filing by the rules and
    regulations under the Act and in accordance with Section 4(a) hereof; no
    stop order suspending the effectiveness of the Registration Statement or any
    part thereof shall have been issued and no proceeding for that purpose shall
    have been initiated or threatened by the Commission; and all requests for
    additional information on the part of the Commission shall have been
    complied with to the Representatives' reasonable satisfaction.
 
                                       6
<PAGE>
        (b) The Representatives shall be furnished with opinions, dated the
    Closing Date, of Gary R. Johnson, Vice President and General Counsel of the
    Company, substantially in the form included as Exhibit A.
 
        (c) The Representatives shall have received from Gardner, Carton &
    Douglas, Chicago, Illinois, counsel for the Underwriters, such opinion or
    opinions dated the Closing Date with respect to the incorporation of the
    Company, this Agreement, the validity of the Indenture, the Bonds, the
    Registration Statement, the Prospectus and other related matters as the
    Representatives may reasonably require, and the Company shall have furnished
    to such counsel such documents as they reasonably 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 President or any Vice President of the Company, dated the
    Closing Date, as to the matters set forth in clause (a) and (h) of this
    Section 6 and to the further effect that the signers of such certificate
    have carefully examined the Registration Statement, the Prospectus and this
    Agreement and that:
 
            (i) the representations and warranties of the Company in this
       Agreement are true and correct 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; and
 
            (ii) there has been no material adverse change in the condition of
       the Company and its subsidiaries taken as a whole, financial or
       otherwise, or in the earnings, affairs or business prospects of the
       Company and its subsidiaries taken as a whole, whether or not arising in
       the ordinary course of business, from that set forth or contemplated by
       the Registration Statement or Prospectus Supplement.
 
        (e) The Representatives shall have received letters from the Company's
    independent public accountants (dated the date of this Agreement and Closing
    Date, respectively, and in form and substance satisfactory to the
    Representatives) advising that (i) they are independent public accountants
    as required by the Act and published rules and regulations of the Commission
    thereunder, (ii) in their opinion, the consolidated financial statements and
    supplemental schedules incorporated by reference in the Registration
    Statement and covered by their opinion filed with the Commission under
    Section 13 of the Exchange Act comply as to form in all material respects
    with the applicable accounting requirements of the Exchange Act and the
    published rules and regulations of the Commission thereunder, (iii) they
    have performed limited procedures, not constituting an audit, including a
    reading of the latest available interim financial statements of the Company
    and its consolidated subsidiaries, a reading of the minutes of meetings of
    the Board of Directors, committees thereof, and of the Shareholders, of the
    Company and its subsidiaries since the date of the most recent audited
    financial statements included or incorporated by reference in the
    Prospectus, inquiries of officials of the Company and its subsidiaries
    responsible for financial accounting matters and such other inquiries and
    procedures as may be specified in such letter, and on the basis of such
    limited review and procedures nothing came to their attention that caused
    them to believe that: (a) any material modifications should be made to any
    unaudited consolidated financial statements of the Company included or
    incorporated by reference in the Registration Statement or Prospectus for
    them to be in conformity with generally accepted accounting principles or
    any unaudited consolidated financial statements of the Company included or
    incorporated by reference in the Registration Statement or Prospectus do not
    comply as to form in all material respects with the applicable accounting
    requirements of the Exchange Act and the rules and regulations of the
    Commission applicable to Form 10-Q; (b) with respect to the period
    subsequent to the date of the most recent financial statements included or
    incorporated by reference in the Prospectus and except as set forth in or
    contemplated by the Registration Statement or Prospectus, there were any
    changes, at a specified date not more than five business days prior to the
    date of the letter, in the capital stock of the
 
                                       7
<PAGE>
    Company, increases in long-term debt or decreases in stockholders' equity or
    net current assets of the Company and its consolidated subsidiaries as
    compared with the amounts shown on the most recent consolidated balance
    sheet included or incorporated in the Prospectus, or for the period from the
    date of the most recent financial statements included or incorporated by
    reference in the Prospectus to such specified date there were any decreases,
    as compared with the corresponding period in the preceding year, in
    operating revenues, operating income, net income, or earnings per share of
    Common Stock of the Company and its subsidiaries, 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; and (iv) they have carried out specified procedures
    performed for the purpose of comparing certain specified financial
    information and percentages (which is limited to financial information
    derived from general accounting records of the Company) included or
    incorporated by reference in the Registration Statement and Prospectus with
    indicated amounts in the financial statements or accounting records of the
    Company and (excluding any questions of legal interpretation) have found
    such information and percentages to be in agreement with the relevant
    accounting and financial information of the Company referred to in such
    letter in the description of the procedures performed by them.
 
        (f) Subsequent to the respective dates as of which information is given
    in the Registration Statement and the Prospectus, there shall not have been
    any change or decrease specified in the letter or letters referred to in
    paragraph (e) of this Section 6 which makes it impractical or inadvisable in
    the judgment of the Representatives to proceed with the public offering or
    the delivery of the Bonds on the terms and in the manner contemplated by the
    Prospectus.
 
        (g) Subsequent to the date hereof, no downgrading shall have occurred,
    nor shall any notice have been given of any intended or potential
    downgrading or of any review for a possible change that does not indicate
    the direction of the possible change, in the rating accorded the Company's
    debt securities or preferred stock by any "nationally recognized statistical
    rating organization," as that term is defined by the Commission for purposes
    of Rule 436(g)(2) under the Act.
 
        (h) (i) Neither the Company nor any of its subsidiaries shall have
    sustained since the date of the latest audited financial statements included
    or incorporated by reference in the Prospectus any loss or interference with
    its business from fire, explosion, flood or other calamity, whether or not
    covered by insurance, or from any labor dispute or court or governmental
    action, order or decree, otherwise than as set forth or contemplated in the
    Prospectus Supplement, and (ii) since the date of this Agreement, neither
    the Company nor any of its subsidiaries shall have incurred any liabilities
    or obligations, direct or contingent, or entered into any transactions, not
    in the ordinary course of business, which are material to the Company and
    its subsidiaries, and there shall not have been any change in the capital
    stock or long-term debt of the Company or any of its subsidiaries or any
    change, or any development involving a prospective change, in or affecting
    the general affairs, management, financial position, stockholders' equity or
    results of operations of the Company and its subsidiaries otherwise than as
    set forth or contemplated in the Prospectus Supplement, the effect of which,
    in any such case described in clause (i) or (ii) is in the judgment of the
    Underwriters so material and adverse as to make it impracticable or
    inadvisable to proceed with the public offering or the delivery of the Bonds
    on the terms and in the manner contemplated by the Prospectus.
 
        (i) No Representative shall have advised the Company that the
    Registration Statement or Prospectus, or any amendment or supplement
    thereto, contains an untrue statement of fact which in the opinion of
    counsel for the Underwriters is material or omits to state a fact which in
    the opinion of counsel for the Underwriters is material and is required to
    be stated therein or is necessary to make the statements therein not
    misleading.
 
        (j) Prior to the Closing Date, the Company shall have furnished to the
    Representatives such further information, certificates and documents as they
    may reasonably request.
 
                                       8
<PAGE>
    If any of the conditions specified in this Section 6 shall not have been
fulfilled when and as required by this Agreement, or if any of the opinions and
certificates mentioned above or elsewhere in this Agreement shall not be
satisfactory in form and substance to the Representatives and their counsel,
this Agreement and all obligations of the Underwriters hereunder may be
cancelled 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 telegraph confirmed in writing.
 
    7.  CONDITIONS OF COMPANY'S OBLIGATIONS.  The obligations of the Company to
sell and deliver the Bonds are subject to the following conditions:
 
        (a) Prior to the Closing Date, 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, to the knowledge
    of the Company or the Representative, threatened.
 
        (b) The order of the Minnesota Public Utilities Commission referred to
    in paragraph (1) of Section 1 shall be in full force and effect.
 
    If any of the conditions specified in this Section 7 shall not have been
fulfilled, this Agreement and all obligations of the Company hereunder may be
cancelled on or at any time prior to the Closing Date by the Company. Notice of
such cancellation shall be given to the Underwriters in writing or by telephone
or facsimile transmission confirmed in writing.
 
    8.  REIMBURSEMENT OF UNDERWRITERS' EXPENSES.  If the sale of the Bonds
provided for herein is not consummated because any condition to the obligations
of the Underwriters set forth in Section 6 hereof is not satisfied 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 upon demand for all out-of-pocket expenses that shall have been
reasonably incurred by them in connection with the proposed purchase and sale of
the Bonds.
 
    9.  INDEMNIFICATION.  (a) The Company agrees to indemnify and hold harmless
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 Bonds
as originally filed or in any amendment thereof, or in the 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 for any legal or other expenses
as reasonably incurred by them in connection with investigating or defending any
such loss, claim, damages, liability or action; PROVIDED 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 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 use
therein and PROVIDED FURTHER that such indemnity with respect to a prospectus
included in the registration statement or any amendment thereto prior to the
supplementing thereof with the Prospectus Supplement shall not inure to the
benefit of any Underwriter (or any person controlling such Underwriter) from
whom the person asserting any such loss, claim, damage or liability purchased
the Bonds which are the subject thereof if such person was not sent or given a
copy of the Prospectus (but without the documents incorporated by reference
therein) at or prior to the confirmation of the sale of such Bonds to such
person in any case where such delivery is required by the Act and the untrue
statement or omission of a material fact contained in such prospectus was
corrected in the Prospectus, provided that the Company shall have delivered the
Prospectus, in a
 
                                       9
<PAGE>
timely manner and in sufficient quantities to permit such delivery by the
Underwriters. This indemnity agreement will be in addition to any liability
which the Company may otherwise have.
 
    (b) Each Underwriter severally agrees to indemnify and hold harmless the
Company, each of its directors, each of its officers who has signed the
Registration Statement and each person, if any, 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 the Underwriters but only with reference
to written information furnished to the Company by or on behalf of such
Underwriter through the Representatives specifically for use in the documents
referred to in the foregoing indemnity, and agrees to reimburse each such
indemnified party for any legal or other expenses reasonably incurred by them in
connection with investigating or defending any such loss, claim, damage,
liability or action. 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 9 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 9, notify the indemnifying party in writing of the commencement thereof;
but the omission to so notify the indemnifying party will not relieve it from
any liability which it may have to any indemnified party otherwise than under
this Section 9. In case any such action is brought against any indemnified
party, and it notifies the indemnifying party of the commencement thereof, the
indemnifying party will be entitled to participate therein, and, to the extent
that it may elect by written notice delivered to the indemnified party promptly
after receiving the aforesaid notice from such indemnified party, to assume the
defense thereof, with counsel satisfactory to such indemnified party; PROVIDED
THAT if the defendants in 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, the indemnified party, or parties shall have the right to
select separate counsel to assume such legal defenses and to otherwise
participate in the defense of such action on behalf of such indemnified party or
parties. Upon receipt of notice from the indemnifying party to such indemnified
party of its election so to assume the defense of such action and approval by
the indemnified party of counsel, the indemnifying party will not be liable to
such indemnified party under this Section 9 for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof unless (i) the indemnified party shall have employed separate counsel in
connection with the assertion of legal defenses in accordance with the proviso
to the next preceding sentence (it being understood, however, that the
indemnifying party shall not be liable for the expenses of more than one
separate counsel and one local counsel, approved by the Representatives in the
case of subparagraph (a), representing the indemnified parties under
subparagraphs (a) or (b), as the case may be, who are parties to such action),
(ii) 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 commencement of the action or (iii) the indemnifying party has
authorized the employment of counsel for the indemnified party at the expense of
the indemnifying party; and except that, if clause (i) or (iii) is applicable,
such liability shall be only in respect of the counsel referred to in such
clause (i) or (iii).
 
    (d) If the indemnification provided for in this Section 9 is unavailable to
or insufficient to hold harmless an indemnified party under subsection (a) or
(b) above in respect of any losses, claims, damages or liabilities (or actions
in respect thereof) referred to therein, then each indemnifying party shall
contribute to the amount paid or payable by such indemnified party as a result
of such losses, claims, damages or liabilities (or actions in respect thereof)
in such proportion as is appropriate to reflect the relative benefits received
by the Company on the one hand and the Underwriters on the other from the
offering of the Bonds. If, however, the allocation provided by the immediately
preceding sentence is not permitted by applicable law or if the indemnified
party failed to give the notice required under subsection (c) above, then each
indemnifying party shall contribute to such amount paid or payable by such
indemnified party in such proportion as is appropriate to reflect not only such
relative benefits but also the
 
                                       10
<PAGE>
relative fault of the Company on the one hand and the Underwriters on the other
in connection with the statements or omissions which resulted in such losses,
claims, damages or liabilities (or actions in respect thereof), as well as any
other relevant equitable considerations. The relative benefits received by the
Company on the one hand and the Underwriters on the other shall be deemed to be
in the same proportion as the total net proceeds from the offering (before
deducting expenses) received by the Company bear to the total underwriting
discounts and commissions received by the Underwriters, in each case as set
forth in the table on the cover page of the Prospectus Supplement. The relative
fault shall be determined by reference to, among other things, whether the
untrue or alleged untrue statement of a material fact or the omission or alleged
omission to state a material fact relates to information supplied by the Company
on the one hand or the Underwriters on the other and the parties' relative
intent, knowledge, access to information and opportunity to correct or prevent
such statement or omission. The Company and the Underwriters agree that it would
not be just and equitable if contributions pursuant to this subsection (d) were
determined by pro rata allocation (even if the Underwriters were treated as one
entity for such purpose) or by any other method of allocation which does not
take account of the equitable considerations referred to above in this
subsection (d). The amount paid or payable by an indemnified party as a result
of the losses, claims, damages or liabilities (or actions in respect thereof)
referred to above in this subsection (d) shall be deemed to include any legal or
other expenses reasonably incurred by such indemnified party in connection with
investigating or defending any such action or claim. Notwithstanding the
provisions of this subsection (d), no Underwriter shall be required to
contribute any amount in excess of the amount by which the total price at which
the Bonds underwritten by it and distributed to the public were offered to the
public exceeds the amount of any damages which such Underwriter has otherwise
been required to pay by reason of such untrue or alleged untrue statement or
omission or alleged omission. 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. The Underwriters' obligations in this subsection (d) to
contribute are several in proportion to their respective underwriting
obligations and not joint.
 
    (e) The obligations of the Company under this Section 9 shall be in addition
to any liability which the Company may otherwise have and shall extend, upon the
same terms and conditions, to each person, if any, who controls any Underwriter
within the meaning of the Act; and the obligations of the Underwriters under
this Section 9 shall be in addition to any liability which the respective
Underwriters may otherwise have and shall extend, upon the same terms and
conditions, to each officer and director of the Company and to each person, if
any, who controls the Company within the meaning of the Act.
 
    10.  DEFAULT BY AN UNDERWRITER.  (a) If any Underwriter shall default in its
obligation to purchase the Bonds which it has agreed to purchase hereunder (in
this Section called the "Unpurchased Bonds"), the Representatives may in their
discretion arrange for themselves or another party or other parties to purchase
such Unpurchased Bonds on the terms contained herein. If within thirty-six hours
after such default by any Underwriter the Representatives do not arrange for the
purchase of such Unpurchased Bonds, then the Company shall be entitled to a
further period of thirty-six hours within which to procure another party or
other parties satisfactory to the Representatives to purchase such Unpurchased
Bonds on such terms. In the event that, within the respective prescribed period,
the Representatives notify the Company that they have so arranged for the
purchase of such Unpurchased Bonds, or the Company notifies the Representatives
that it has so arranged for the purchase of such Unpurchased Bonds, the
Representatives or the Company shall have the right to postpone the Closing Date
for such Unpurchased Bonds for a period of not more than seven days, in order to
effect whatever changes may thereby be made necessary in the Registration
Statement or the Prospectus as amended or supplemented, or in any other
documents or arrangements, and the Company agrees to file promptly any
amendments or supplements to the Registration Statement or the Prospectus which
in the opinion of the Representatives may thereby be made necessary. The term
"Underwriter" as used in this Agreement shall include any person substituted
under this Section with like effect as if such person had originally been a
party to this Agreement with respect to such Unpurchased Bonds.
 
                                       11
<PAGE>
    (b) If, after giving effect to any arrangements for the purchase of the
Unpurchased Bonds of a defaulting Underwriter or Underwriters by the
Representatives and the Company as provided in subsection (a) above, the
aggregate principal amount of such Unpurchased Bonds which remains unpurchased
does not exceed one-eleventh of the aggregate principal amount of the Bonds,
then the Company shall have the right to require each non-defaulting Underwriter
to purchase the principal amount of Bonds which such Underwriter agreed to
purchase hereunder and, in addition, to require each non-defaulting Underwriter
to purchase its pro rata share (based on the principal amount of Bonds which
such Underwriter agreed to purchase hereunder) of the Unpurchased Bonds of such
defaulting Underwriter or Underwriters for which such arrangements have not been
made; but nothing herein shall relieve a defaulting Underwriter from liability
for its default.
 
    (c) If, after giving effect to any arrangements for the purchase of the
Unpurchased Bonds of a defaulting Underwriter or Underwriters by the
Representatives and the Company as provided in subsection (a) above, the
aggregate principal amount of Unpurchased Bonds which remains unpurchased
exceeds one-eleventh of the aggregate principal amount of the Bonds, as referred
to in subsection (b) above, or if the Company shall not exercise the right
described in subsection (b) above to require non-defaulting Underwriters to
purchase Unpurchased Bonds of a defaulting Underwriter or Underwriters, then
this Agreement shall thereupon terminate, without liability on the part of any
non-defaulting Underwriter or the Company, except for the expenses to be borne
by the Company and the Underwriters as provided in Section 5 hereof and the
indemnity and contribution agreements in Section 9 hereof; but nothing herein
shall relieve a defaulting Underwriter from liability for its default.
 
    11.  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 all Bonds, if prior to such time (i) 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) if
a banking moratorium shall have been declared either by Federal, Minnesota or
New York State authorities, (iii) if trading in any securities of the Company
shall have been suspended or halted, or (iv) if there shall have occurred any
outbreak or escalation of hostilities involving the United States or the
declaration by the United States of a war or national emergency or any other
calamity or crisis the effect of which on the financial markets in the United
States is such as to make it, in the judgment of the Representatives,
impracticable or inadvisable to proceed with the public offering or delivery of
the Bonds on the terms and in the manner contemplated in the Prospectus.
 
    12.  REPRESENTATIONS AND INDEMNITIES TO SURVIVE DELIVERY.  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
their respective officers, directors or controlling persons within the meaning
of the Act, and will survive delivery of and payment for the Bonds. The
provisions of Sections 5, 8 and 9 hereof shall survive the termination or
cancellation of this Agreement.
 
    13.  NOTICES.  All communications hereunder will be in writing and, if sent
to the Representatives, will be mailed, delivered or transmitted and confirmed
to them at their address set forth for that purpose in Schedule 1 hereto or, if
sent to the Company, will be mailed, delivered or transmitted and confirmed to
it at 414 Nicollet Mall, Minneapolis, Minnesota 55401, attention Secretary.
 
    14.  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 9 hereof, and no other
person will have any right or obligation hereunder.
 
    15.  APPLICABLE LAW.  This Agreement will be governed by and construed in
accordance with the laws of the State of Minnesota.
 
                                       12
<PAGE>
    16.  COUNTERPARTS.  This Agreement may be executed in counterparts, all of
which, taken together, shall constitute a single agreement among the parties to
such counterparts.
 
    17.  REPRESENTATION OF THE UNDERWRITERS.  The Representatives represent and
warrant to the Company that they are authorized to act as the representatives of
the Underwriters in connection with this financing and that the Representatives'
execution and delivery of this Agreement and any action under this Agreement
taken by such Representatives will be binding upon all Underwriters.
 
    18.  OTHER.  Time shall be of the essence for all purposes of this
Agreement. As used herein, "business day" shall mean any day when the
Commission's office in Washington D.C. is open for business.
 
    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,
                                  NORTHERN STATES POWER COMPANY
                                  By    /s/
                                     ...........................................
 
                                                    Vice President
 
The foregoing Agreement is hereby
confirmed
  and accepted as of the date first
above written.
         SALOMON BROTHERS INC
By    /s/
   ...................................
 
   FOR ITSELF OR THEMSELVES AND AS
   REPRESENTATIVES OF
   THE SEVERAL UNDERWRITERS, IF ANY,
   NAMED IN
   SCHEDULE II TO THE FOREGOING
   AGREEMENT.
 
                                       13
<PAGE>
                                   SCHEDULE I
 
Underwriting Agreement dated March 11, 1998
 
Registration Statement No. 33-63243
 
Representatives and Addresses:  Salomon Brothers Inc
                            Seven World Trade Center
                            New York, New York 10048
 
Bonds:
 
   Designation: 6 1/2% First Mortgage Bonds, Series due March 1, 2028
 
   Principal Amount:   $150,000,000
 
   Supplemental Indenture dated as of March 1, 1998
 
   Date of Maturity: March 1, 2028
 
   Interest Rate:  6 1/2% per annum, payable March 1 and September 1 of each
                   year, commencing September 1, 1998
 
   Purchase Price:  98.185% of the principal amount thereof, plus accrued
interest from
                  March 1, 1998 to the date of payment and delivery.
 
   Public Offering Price:   98.826% of the principal amount thereof, plus
                            accrued interest from March 1, 1998 to the date of
                            payment and delivery.
 
Payment to be made in federal (same day) funds. _X_ Yes    ___ No
 
Closing Date and Location: March 17, 1998
                        Northern States Power Company
                        414 Nicollet Mall
                        Minneapolis, MN 55401
 
Office for Delivery of Bonds: The Depository Trust Company
                         55 Water Street
                         19th Floor
                         New York, New York 10041
 
Office for Payment of Bonds: Northern States Power Company
                         414 Nicollet Mall
                         Minneapolis, MN 55401
 
Office for Checking of Bonds: The Depository Trust Company
                         55 Water Street
                         19th Floor
                         New York, New York 10041
 
                                       14
<PAGE>
                                  SCHEDULE II
 
<TABLE>
<CAPTION>
NAME                                                                                                    AMOUNT
- --------------------------------------------------------------------------------------------------  --------------
<S>                                                                                                 <C>
Salomon Brothers Inc..............................................................................  $   25,000,000
ABN Amro..........................................................................................      25,000,000
BancAmerica.......................................................................................      25,000,000
Bear Stearns & Co. Inc............................................................................      25,000,000
Chase Securities Inc..............................................................................      25,000,000
Nationsbanc.......................................................................................      25,000,000
                                                                                                    --------------
        Total.....................................................................................  $  150,000,000
                                                                                                    --------------
                                                                                                    --------------
</TABLE>
 
                                       15
<PAGE>
                                                                       EXHIBIT A
 
                       FORM OF OPINION OF GARY R. JOHNSON
      RE: $           PRINCIPAL AMOUNT OF FIRST MORTGAGE BONDS, SERIES DUE
                                           ,    %
           OF NORTHERN STATES POWER COMPANY, A MINNESOTA CORPORATION.
 
Gentlemen:
 
    For the purpose of rendering this opinion, I have examined the proceedings
taken by Northern States Power Company, a Minnesota corporation, herein called
the "Company," with respect to the issue and sale by the Company of $
principal amount of First Mortgage Bonds, Series due              ,    % herein
called the "Bonds." In connection therewith I have participated in the
preparation of the proceedings for the issuance and sale of the Bonds including
the Underwriting Agreement dated                  , between you and the Company
relating to your purchase of the Bonds, herein called the "Agreement," and have
either participated in the preparation of or examined the Trust Indenture dated
February 1, 1937, and the Supplemental Trust Indentures thereto and the
Supplemental Trust Indenture dated as of                  , creating the Bonds,
all from the Company to Harris Trust and Savings Bank, as Trustee (which Trust
Indenture and Supplemental Trust Indentures are herein collectively called the
"Indenture"). I also have participated in the preparation of or examined the
registration statement and any amendments thereto and the accompanying
prospectuses and any supplements thereto, as filed under the Securities Act of
1933, as amended (the "Act"), with respect to the Bonds. Whenever the terms
"Registration Statement" or "Prospectus" are used herein, they shall have the
respective meanings set forth in the Agreement. My examination has extended to
all statutes, records, instruments, and documents which I have deemed necessary
to examine for the purposes of this opinion.
 
    I am of the opinion that:
 
        1. The Company is a legally existing corporation under the laws of the
    State of Minnesota; has corporate power, right, and authority to do business
    and to own property in the states of Minnesota, North Dakota, and South
    Dakota in the manner and as set forth in the Prospectus; has corporate
    power, right and authority to own securities of its subsidiaries; and has
    corporate power, right, and authority to make the Indenture and issue and
    sell the Bonds;
 
        2. The authorized capital stock of the Company is as set forth in the
    Prospectus and all of the issued shares of capital stock of the Company have
    been duly authorized and validly issued and are fully paid and
    non-assessable;
 
        3. Each Significant Subsidiary, as defined in the Agreement, of the
    Company has been duly incorporated and is validly existing as a corporation
    in good standing under the laws of the jurisdiction of its incorporation and
    is duly qualified as a foreign corporation to transact business and is in
    good standing in each jurisdiction in which it owns or leases substantial
    properties or in which the conduct of its business requires such
    qualification; all of the issued and outstanding capital stock of each
    subsidiary has been duly authorized and validly issued and is fully paid and
    non-assessable; and the capital stock of each such subsidiary owned by the
    Company, directly or through subsidiaries, is owned free and clear of any
    pledge, lien, encumbrance, claim or equity;
 
        4. The Agreement has been duly authorized, executed, and delivered by
    the Company and is a valid and binding obligation of the Company, except to
    the extent that the provisions for indemnities may be held to be
    unenforceable as against public policy;
 
        5. The Indenture has been duly authorized by appropriate corporate
    proceedings on the part of the Company, has been duly executed and delivered
    and constitutes a legal, valid, and binding instrument enforceable in
    accordance with its terms, except as the provisions of the United States
    Bankruptcy Code may affect the validity of the lien thereof with respect to
    proceeds, products, rents,
 
                                       1
<PAGE>
    issues, or profits realized, and additional property acquired, after the
    commencement of a case under said Code, and except as enforcement of the
    provisions of the Indenture may be limited by the laws of the states of
    Minnesota, North Dakota, and South Dakota (where property covered thereby is
    located) affecting the remedies for the enforcement of the security provided
    for in the Indenture (which state laws do not in my opinion make such
    remedies inadequate for realization of the benefits of such security) or
    except as the same may be limited by bankruptcy or insolvency laws or other
    similar laws;
 
        6. The issuance of the Bonds in accordance with the terms of the
    Indenture and the sale and delivery thereof pursuant to the provisions of
    the Agreement have been duly authorized by the Company; the statements made
    under the captions "Description of New Bonds" and "Supplemental Description
    of Offered Bonds" in the Prospectus, insofar as they purport to summarize
    provisions of documents specifically referred to therein, fairly present the
    information called for with respect thereto by Form S-3; the Bonds are in
    due legal form, constitute legal, valid, and binding obligations of the
    Company, and (subject to the qualifications expressed in paragraph 5 above
    with respect to the validity and enforceability of certain of the provisions
    of the Indenture) and enforceable in accordance with their terms;
 
        7. The consummation of the transactions contemplated in the Agreement
    and the fulfillment of the terms thereof and compliance by the Company with
    all the terms and provisions of the Indenture will not result in a breach of
    any of the terms or provisions of, or constitute a default under, any
    indenture, mortgage, deed of trust or other agreement or instrument known to
    me to which the Company is a party or by which it is bound, or the Restated
    Articles of Incorporation, as amended, or by-laws of the Company or, to the
    best of my knowledge, any order, rule or regulation applicable to the
    Company of any court or of any Federal or state regulatory body or
    administrative agency or other governmental body having jurisdiction over
    the Company or its property;
 
        8. The Registration Statement has become effective under the Act. The
    Prospectus Supplement (as defined in the Agreement) has been filed pursuant
    to Rule 424(b) under the Act, and no proceedings for a stop order have been
    instituted or to the knowledge of such counsel are pending or threatened
    under Section 8(d) of the Act; the Minnesota Public Utilities Commission has
    issued its order approving the Company's capital structure which order
    authorizes the issuance of the Bonds; the Indenture has been duly qualified
    under the Trust Indenture Act of 1939, as amended (the "Trust Indenture
    Act"); and no further approval of, authorization, consent, certificate or
    order of any governmental body, federal, state or other, is required in
    connection with the issuance and sale of the Bonds by the Company to you as
    provided in the Agreement, except as may be required by state securities
    laws;
 
        9. At the time the Registration Statement became effective, the
    Registration Statement (other than the financial statements and supporting
    schedules included or incorporated by reference therein, as to which no
    opinion is being expressed) complied as to form in all material respects
    with the requirements of the Act, the rules and regulations thereunder, the
    Trust Indenture Act and the rules and regulations thereunder;
 
        10. I do not know of any legal or governmental proceedings required to
    be described in the Prospectus which are not described as required nor of
    any contracts or documents of a character required to be described in the
    Registration Statement or Prospectus or to be filed as exhibits to the
    Registration Statement which are not described and filed as required;
 
        11. The Indenture is in proper form, conforming to the laws of the
    States of Minnesota, North Dakota, and South Dakota, to give and create the
    lien which it purports to create and has been and now is duly and properly
    recorded or filed in all places necessary to effectuate the lien of the
    Indenture;
 
        12. The Company has good and valid title to all real and fixed property
    and leasehold rights described or enumerated in the Indenture (except such
    properties as have been released from the lien thereof in accordance with
    the terms thereof), subject only to: (a) taxes and assessments not yet
 
                                       2
<PAGE>
    delinquent; (b) the lien of the Indenture; (c) as to parts of the Company's
    property, certain easements, conditions, restrictions, leases, and similar
    encumbrances which do not affect the Company's use of such property in the
    usual course of its business, certain minor defects in titles which are not
    material, defects in titles to certain properties which are not essential to
    the Company's business; and mechanics' lien claims being contested or not of
    record or for the satisfaction or discharge of which adequate provision has
    been made by the Company pursuant to the Indenture;
 
        13. The Bonds are secured by and entitled to the benefits of the
    Indenture equally and ratably, except as to sinking fund provisions, with
    all other bonds duly issued and outstanding under the Indenture by a valid
    and direct first mortgage lien of the Indenture on all of the real and fixed
    properties, leasehold rights, franchises, and permits now owned by the
    Company, subject only to the items set forth in the preceding paragraph 12
    of this opinion;
 
        14. The Bonds also are secured equally and ratably, except as to sinking
    fund provisions, with all other bonds duly issued and outstanding under the
    Indenture by a valid and direct first mortgage lien (subject to permitted
    liens as defined in the Indenture) on all real and fixed property hereafter
    acquired by the Company in conformity with the terms of the Indenture,
    except as the United States Bankruptcy Code may affect the validity of the
    lien of such Indenture on property acquired after the commencement of a case
    under such Act, except as to the prior lien of the Trustee under the
    Indenture in certain events specified therein, and except as otherwise
    provided in the Indenture in the case of consolidation, merger, or transfer
    of all the mortgaged and pledged property as an entirety;
 
        15. The Company has all necessary power under statutory provisions,
    franchises (which expire at various dates), or permits to serve the
    customers in the jurisdictions where it provided electric and gas service,
    except in certain instances that are not material to the Company; and
 
        16. All statements contained in the Registration Statement and
    Prospectus under the caption "Description of New Bonds" purporting to set
    forth the opinion of counsel or purporting to be based upon the opinion of
    counsel correctly set forth my opinion on said respective matters.
 
    These opinions do not cover titles to easements for water flowage purposes
or rights of way for electric and gas transmission and distribution facilities,
steam mains, and telephone lines. However, the Company has the power of eminent
domain in the states in which it operates.
 
    In the course of my participation in the preparation of the Registration
Statement and Prospectus I made investigations as to the accuracy of certain of
the statements of fact contained therein, I discussed other matters with
officers, employees, and representatives of the Company, and I examined various
corporate records and data. While I do not pass upon or assume responsibility
for, and shall not be deemed to have independently verified, the accuracy and
completeness of the statements contained in the Registration Statement or
Prospectus (except as to matters set forth in paragraphs 9 and 16 above) nothing
has come to my attention that would lead me to believe that the Registration
Statement at the time it became effective contained an untrue statement of a
material fact or omitted to state a material fact required to be stated therein
or necessary to make the statements therein not misleading or that the
Prospectus as of the date of the Agreement or at the date hereof contained an
untrue statement of a material fact or omitted to state a material fact
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not misleading.
 
    In giving my opinion under paragraph 12 above, I have relied upon
examinations of abstracts of titles to properties of the Company, said abstracts
bearing various dates, and nothing has come to my attention which would lead me
to believe that anything has occurred since the dates of the abstracts which
would adversely affect the titles shown on the abstracts. In giving opinions as
to conformity to the laws of States other than Minnesota and as to the
franchises and titles to property of the Company, I have in certain instances
relied upon the opinion of other counsel employed or retained by the Company to
render opinions in respect thereto.
 
                                        Respectfully submitted,
 
                                       3
<PAGE>
                                        By
                                        ----------------------------------------
 
                                                     Gary R. Johnson
                                            Vice President and General Counsel
                                              Northern States Power Company
 
                                       4

<PAGE>
                          SUPPLEMENTAL TRUST INDENTURE
                                      FROM
                         NORTHERN STATES POWER COMPANY
 
                                       TO
                         HARRIS TRUST AND SAVINGS BANK
                                    TRUSTEE
                                 --------------
                              DATED MARCH 1, 1998
                                 --------------
                        SUPPLEMENTAL TO TRUST INDENTURE
                             DATED FEBRUARY 1, 1937
                                      AND
                           SUPPLEMENTAL AND RESTATED
                             TRUST INDENTURE DATED
                                  MAY 1, 1988
<PAGE>
                               TABLE OF CONTENTS
                                 --------------
 
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                   <C>                                                                                    <C>
Parties....................................................................................................           1
Recitals...................................................................................................           1
Form of Bonds of Series 2028 Bonds and Series 2003 Bonds...................................................           2
Form of Trustee's Certificate..............................................................................           5
Further Recitals...........................................................................................           5
 
                                                       ARTICLE I.
                               SPECIFIC SUBJECTION OF ADDITIONAL PROPERTY TO THE LIEN OF
                                                THE ORIGINAL INDENTURE.
Section 1.01--        Grant of certain property, including personal property to comply with the Uniform
                      Commercial Code, subject to permitted liens and other exceptions contained in 1937
                      Indenture............................................................................           5
 
                                                      ARTICLE II.
                             FORM AND EXECUTION OF SERIES 2028 BONDS AND SERIES 2003 BONDS.
Section 2.01--        Terms of Series 2028 Bonds...........................................................           6
Section 2.02--        Terms of Series 2003 Bonds...........................................................           8
Section 2.03--        Redemption of Series 2028 Bonds and Series 2003 Bonds................................           9
Section 2.04--        Interchangeability of bonds..........................................................           9
Section 2.05--        Charges for exchange or transfer of bonds............................................           9
Section 2.06--        Execution of bonds...................................................................           9
Section 2.07--        Book-Entry System....................................................................          10
 
                                                      ARTICLE III.
                                          APPOINTMENT OF AUTHENTICATING AGENT.
Section 3.01--        Appointment of agent or agents.......................................................          12
Section 3.02--(a)     Qualification of agents..............................................................          12
            (b)       Continuation of agent upon merger or consolidation...................................          12
            (c)       Termination of successor agent.......................................................          12
            (d)       Compensation of agent................................................................          12
Section 3.03--        Form of alternate certificate of authentication......................................          13
Section 3.04--        Limit on location and number of agents...............................................          13
 
                                                      ARTICLE IV.
                                         FINANCING STATEMENT TO COMPLY WITH THE
                                                UNIFORM COMMERCIAL CODE.
Section 4.01--        Names and addresses of debtor and secured party......................................          13
Section 4.02--        Property subject to lien.............................................................          13
Section 4.03--        Maturity dates and principal amounts of obligations secured..........................          13
Section 4.04--        Financing Statement adopted for all First Mortgage Bonds listed in Section 4.03......          14
</TABLE>
<PAGE>
 
                                       ii
 
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                   <C>                                                                                    <C>
Section 4.05--        Recording data for the 1937 Indenture and prior Supplemental Trust Indentures........          14
Section 4.06--        Financing Statement covers additional series of First Mortgage Bonds.................          15
 
                                                       ARTICLE V.
                                                AMENDMENTS TO INDENTURE.
 
Section 5.01--        Consent of holders of Bonds..........................................................          15
 
                                                      ARTICLE VI.
                                                     MISCELLANEOUS.
Section 6.01--        Recitals of fact, except as stated, are statements of the Company....................          15
Section 6.02--        Supplemental Trust Indenture to be construed as a part of the 1937 Indenture, as
                      supplemented.........................................................................          15
Section 6.03--(a)     Trust Indenture Act to control.......................................................          16
            (b)       Severability of conditions contained in Supplemental Trust Indenture and bonds.......          16
Section 6.04--        Word "Indenture" as used herein includes in its meaning the 1937 Indenture and all
                      indentures supplemental thereto......................................................          16
Section 6.05--        References to either party in Supplemental Trust Indenture include successors or
                      assigns..............................................................................          16
Section 6.06--(a)     Provision for execution in counterparts..............................................          16
            (b)       Table of Contents and descriptive headings of Articles not to affect meaning.........          16
                                                     --------------
 
Schedule A.................................................................................................         A-1
</TABLE>
<PAGE>
    SUPPLEMENTAL  TRUST INDENTURE, made as of the 1st day of March, 1998, by and
between NORTHERN STATES POWER COMPANY, a corporation duly organized and existing
under and by virtue of the laws of the State of Minnesota, having its  principal
office  in the City of  Minneapolis in said State  (the "Company"), party of the
first part, and HARRIS TRUST AND SAVINGS BANK, a corporation duly organized  and
existing  under and by virtue  of the laws of the  State of Illinois, having its
principal office  in  the  City  of  Chicago in  said  State,  as  Trustee  (the
"Trustee"), party of the second part;
 
WITNESSETH:
 
    WHEREAS,  the Company heretofore  has executed and  delivered to the Trustee
its Trust Indenture (the "1937 Indenture"), made as of February 1, 1937, whereby
the Company granted, bargained,  sold, warranted, released, conveyed,  assigned,
transferred,  mortgaged, pledged, set over, and confirmed to the Trustee, and to
its respective successors in trust, all property, real, personal, and mixed then
owned or thereafter acquired or to be acquired by the Company (except as therein
excepted from  the lien  thereof) and  subject  to the  rights reserved  by  the
Company  in and  by the  provisions of the  1937 Indenture,  to be  held by said
Trustee in trust  in accordance with  provisions of the  1937 Indenture for  the
equal  pro  rata benefit  and  security of  all and  every  of the  bonds issued
thereunder in accordance with the provisions thereof; and
 
    WHEREAS, the Company heretofore has executed and delivered to the Trustee  a
Supplemental  Trust  Indenture, made  as of  June 1,  1942, whereby  the Company
conveyed, assigned, transferred, mortgaged, pledged, set over, and confirmed  to
the  Trustee, and its  respective successors in  said trust, additional property
acquired by it subsequent to the date of the 1937 Indenture; and
 
    WHEREAS, the Company heretofore  has executed and  delivered to the  Trustee
the  following additional  Supplemental Trust  Indentures which,  in addition to
conveying, assigning,  transferring,  mortgaging, pledging,  setting  over,  and
confirming  to  the  Trustee,  and  its  respective  successors  in  said trust,
additional property acquired  by it subsequent  to the preparation  of the  next
preceding  Supplemental Trust Indenture and adding to the covenants, conditions,
and agreements of the 1937  Indenture certain additional covenants,  conditions,
and  agreements to be observed  by the Company, created  the following series of
First Mortgage Bonds:
 
<TABLE>
<CAPTION>
     DATE OF SUPPLEMENTAL
       TRUST INDENTURE                            DESIGNATION OF SERIES
- ------------------------------  ----------------------------------------------------------
<S>                             <C>
February 1, 1944                Series due February 1, 1974 (retired)
October 1, 1945                 Series due October 1, 1975 (retired)
July 1, 1948                    Series due July 1, 1978 (retired)
August 1, 1949                  Series due August 1, 1979 (retired)
June 1, 1952                    Series due June 1, 1982 (retired)
October 1, 1954                 Series due October 1, 1984 (retired)
September 1, 1956               Series due 1986 (retired)
August 1, 1957                  Series due August 1, 1987 (redeemed)
July 1, 1958                    Series due July 1, 1988 (retired)
December 1, 1960                Series due December 1, 1990 (retired)
August 1, 1961                  Series due August 1, 1991 (retired)
June 1, 1962                    Series due June 1, 1992 (retired)
September 1, 1963               Series due September 1, 1993 (retired)
August 1, 1966                  Series due August 1, 1996 (redeemed)
June 1, 1967                    Series due June 1, 1995 (redeemed)
October 1, 1967                 Series due October 1, 1997 (redeemed)
May 1, 1968                     Series due May 1, 1998 (redeemed)
October 1, 1969                 Series due October 1, 1999 (redeemed)
February 1, 1971                Series due March 1, 2001 (redeemed)
May 1, 1971                     Series due June 1, 2001 (redeemed)
February 1, 1972                Series due March 1, 2002
January 1, 1973                 Series due February 1, 2003
January 1, 1974                 Series due January 1, 2004 (redeemed)
September 1, 1974               Pollution Control Series A (redeemed)
April 1, 1975                   Pollution Control Series B (redeemed)
May 1, 1975                     Series due May 1, 2005 (redeemed)
March 1, 1976                   Pollution Control Series C (retired)
June 1, 1981                    Pollution Control Series D, E and F (redeemed)
December 1, 1981                Series due December 1, 2011 (redeemed)
</TABLE>
<PAGE>
 
                                       2
 
<TABLE>
<CAPTION>
     DATE OF SUPPLEMENTAL
       TRUST INDENTURE                            DESIGNATION OF SERIES
- ------------------------------  ----------------------------------------------------------
<S>                             <C>
May 1, 1983                     Series due May 1, 2013 (redeemed)
December 1, 1983                Pollution Control Series G (redeemed)
September 1, 1984               Pollution Control Series H (redeemed)
December 1, 1984                Resource Recovery Series I
May 1, 1985                     Series due June 1, 2015 (redeemed)
September 1, 1985               Pollution Control Series J, K and L
July 1, 1989                    Series due July 1, 2019 (redeemed)
June 1, 1990                    Series due June 1, 2020 (redeemed)
October 1, 1992                 Series due October 1, 1997 (retired)
April 1, 1993                   Series due April 1, 2003
December 1, 1993                Series due December 1, 2000, and December 1, 2005
February 1, 1994                Series due February 1, 1999
October 1, 1994                 Series due October 1, 2001
June 1, 1995                    Series due July 1, 2025
April 1, 1997                   Pollution Control Series M, N, O and P; and
</TABLE>
 
    WHEREAS, the  1937 Indenture  and all  of the  foregoing Supplemental  Trust
Indentures are referred to herein collectively as the "Original Indenture;" and
 
    WHEREAS,  the Company heretofore has executed and delivered to the Trustee a
Supplemental and  Restated Trust  Indenture, dated  May 1,  1988 (the  "Restated
Indenture"),   which,  in   addition  to   conveying,  assigning,  transferring,
mortgaging, pledging,  setting over,  and  confirming to  the Trustee,  and  its
respective  successors  in  said  trust,  additional  property  acquired  by  it
subsequent  to  the  preparation  of  the  next  preceding  Supplemental   Trust
Indenture, amended and restated the Original Indenture; and
 
    WHEREAS,  the  Restated Indenture  will not  become effective  and operative
until all bonds of each series issued under the Original Indenture prior to  May
1,  1988 shall have been retired  through payment or redemption (including those
bonds "deemed to be  paid" within the  meaning of that term  as used in  Article
XVII of the 1937 Indenture) or until, subject to certain exceptions, the holders
of  the requisite  principal amount  of such bonds  shall have  consented to the
amendments contained in the  Restated Indenture (such  date being herein  called
the "Effective Date"); and
 
    WHEREAS,  the Original Indenture and the  Restated Indenture are referred to
herein collectively as the "Indenture"; and
 
    WHEREAS, the Indenture 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 is desirous of providing for the creation of (a) a new
series of First Mortgage  Bonds to be designated  "First Mortgage Bonds,  Series
due  March 1,  2028" (the  "Series 2028 Bonds")  and (b)  a new  series of First
Mortgage Bonds to be designated "First Mortgage Bonds, Series due March 1, 2003"
(the "Series  2003 Bonds",  and collectively  with the  Series 2028  Bonds,  the
"Bonds"),  the Bonds  of each  series to be  issued as  registered bonds without
coupons in denominations of a multiple of $1000, and the bonds of said series to
be substantially in the form and of the tenor following, to-wit:
 
               (Form of Series 2028 Bonds and Series 2003 Bonds)
                         NORTHERN STATES POWER COMPANY
            (Incorporated under the laws of the State of Minnesota)
                              First Mortgage Bond
                              Series due March 1,
No. ______________                                              $ ______________
 
    Unless this certificate is presented by an authorized representative of  The
Depository Trust Company, a New York corporation, to the issuer or its agent for
registration of transfer, exchange or payment, and any
<PAGE>
                                       3
 
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. or to such other entity as is requested by  an
authorized representative of The Depository Trust Company), 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.
 
    NORTHERN  STATES POWER COMPANY,  a corporation organized  and existing under
the laws of the State of  Minnesota (the "Company"), for value received,  hereby
promises  to pay to                 or  registered assigns, at the office of the
Trustee, in Chicago, Illinois, or, at the option of the registered owner, at the
agency of the Company in the Borough  of Manhattan, City and State of New  York,
the  sum of                    Dollars in  lawful money of  the United States of
America, on the first day  of March, [2028] [2003],  and to pay interest  hereon
from  the date hereof at the rate  of [six and one-half][five and seven-eighths]
percent per annum, in like money, until the Company's obligation with respect to
the payment  of such  principal sum  shall be  discharged; said  interest  being
payable  at the  option of the  person entitled  to such interest  either at the
office of the Trustee, in Chicago, Illinois, or at the agency of the Company  in
the  Borough of Manhattan, City and State of New York, on the first day of March
and on the first day of September in each year provided that as long as there is
no existing default in  the payment of  interest and except  for the payment  of
defaulted  interest, the interest payable on any  March 1 or September 1 will be
paid to  the person  in whose  name this  bond was  registered at  the close  of
business on the record date (the February 18 prior to such March 1 or the August
21  prior to such  September 1 unless  any such date  is not a  business day, in
which event it will be the next preceding business day).
 
    "EXCEPT UNDER THE  LIMITED CIRCUMSTANCES DESCRIBED  IN THE INDENTURE,  THESE
GLOBAL  BONDS MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY OR BY A
NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY, ANOTHER NOMINEE OF THE  DEPOSITORY,
A SUCCESSOR OF THE DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR."
 
    This  bond is one of a duly authorized issue of bonds of the Company, 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
tenor,  all issued and to be issued under and equally secured (except insofar 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 Trust Indenture dated  February 1, 1937 (the "1937 Indenture"),  as
supplemented   by   45   supplemental   trust   indentures   (collectively,  the
"Supplemental Indentures"), a  Supplemental and Restated  Trust Indenture  dated
May  1, 1988 (the  "Restated Indenture") and a  new supplemental trust indenture
for the bonds of this series (the "New Supplemental Indenture"), executed by the
Company to Harris Trust and Savings  Bank, as Trustee (the "Trustee"). The  1937
Indenture,   as  supplemented  by  the  Supplemental  Indentures,  the  Restated
Indenture and the New Supplemental Indenture herein are referred to collectively
as the "Indenture". Reference hereby is made to the Indenture 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 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 default as in the Indenture provided.
 
    With the  consent of  the Company  and to  the extent  permitted by  and  as
provided  in the Indenture, the rights and obligations of the Company and of the
holders of the bonds, and the terms  and provisions of the Indenture and of  any
instruments  supplemental thereto may be modified or altered by affirmative vote
of the holders of at least 80% 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  Company's interest
therein as provided in the Indenture); provided that without the consent of  all
holders  of all bonds  affected no such modification  or alteration shall permit
the extension of the maturity of the  principal of any bond or the reduction  in
the  rate of interest thereon or any  other modification in the terms of payment
of such principal or interest. The foregoing 80% requirement will be reduced  to
66 2/3% when all bonds of each series issued under the Indenture prior to May 1,
1985, shall have been retired or all the holders thereof shall have consented to
such reduction.
<PAGE>
                                       4
 
    The  Restated  Indenture  amends and  restates  the 1937  Indenture  and the
Supplemental Indentures.  The  Restated  Indenture  will  become  effective  and
operative  (the "Effective Date") when all Bonds of each series issued under the
Indenture prior  to May  1, 1988  shall  have been  retired through  payment  or
redemption (including those bonds "deemed to be paid" within the meaning of that
term as used in Article XVII of the 1937 Indenture) or until, subject to certain
exceptions,  the holders of  the requisite principal amount  of such bonds shall
have consented to the amendments contained in the Restated Indenture. Holders of
the bonds of this series and of each subsequent series of bonds issued under the
Indenture likewise will  be bound by  the amendments contained  in the  Restated
Indenture  when they  become effective and  operative. Reference is  made to the
Restated Indenture  for  a  complete description  of  the  amendments  contained
therein to the 1937 Indenture and to the Supplemental Indentures.
 
    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 and for all other  purposes and shall not be  affected by any notice  to
the contrary.
 
    Bonds  of this series are not redeemable  prior to maturity, for any reason,
and are not subject to a sinking fund.
 
    This bond is transferable as prescribed  in the Indenture by the  registered
owner hereof in person, or by his duly authorized attorney, at the office of the
Trustee in Chicago, Illinois, or at the option of the owner at the agency of the
Company in the Borough of Manhattan, City and State of New York, or elsewhere if
authorized  by the  Company, upon surrender  and cancellation of  this bond, and
thereupon a  new bond  or bonds  of  the same  series and  of a  like  aggregate
principal  amount  will be  issued  to the  transferee  in exchange  therefor as
provided in the Indenture, upon payment of taxes or other governmental  charges,
if any, that may be imposed in relation thereto.
 
    Bonds  of this series are interchangeable  as to denominations in the manner
and upon the conditions prescribed in the Indenture.
 
    No charge shall be made by the Company for any exchange or transfer of bonds
of the  Series  due March  1,  [2028] [2003],  other  than for  taxes  or  other
governmental charges, if any, that may be imposed in relation thereto.
 
    No recourse shall be had for the payment of the principal of or the interest
on  this bond, or any part  thereof, or of any claim  based hereon or in respect
hereof or of said Indenture, against any incorporator, or any past, present,  or
future  shareholder, 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  part of the consideration for the  issue
hereof, expressly waived and released, as more fully provided in the Indenture.
 
    This bond shall not be valid or become obligatory for any purpose unless and
until  the certificate of authentication hereon shall  have been signed by or on
behalf of Harris Trust and Savings Bank, as Trustee under the Indenture, or  its
successor thereunder.
 
    IN WITNESS WHEREOF, NORTHERN STATES POWER COMPANY has caused this bond to be
executed  in its  name by its  President or  a Vice President  and its corporate
seal, or a facsimile thereof, to be hereto affixed and attested by its Secretary
or an Assistant Secretary.
    Dated: ____________________________       NORTHERN STATES POWER COMPANY
        Attest: ________________________  By ___________________________________
         _________ Secretary                       _________ President
 
                          (Form of Trustee's Certificate)
<PAGE>
                                       5
 
    This bond is one of the bonds of the Series designated thereon, described in
the within-mentioned Indenture.
 
                                          HARRIS TRUST AND SAVINGS BANK,
                                                As Trustee,
                                            By _________________________________
                                                      Authorized Officer
 
and
 
    WHEREAS, the  Company is  desirous  of conveying,  assigning,  transferring,
mortgaging,  pledging, setting  over, and confirming  to the Trustee  and to its
respective successors in trust, additional property acquired by it subsequent to
the date of  the preparation of  the Supplemental Trust  Indenture dated  April,
1997; and
 
    WHEREAS,  the  Indenture  provides in  substance  that the  Company  and the
Trustee may enter into indentures  supplemental thereto for the purposes,  among
others, of creating and setting forth the particulars of any new series of bonds
and  of providing  the terms  and conditions of  the issue  of the  bonds of any
series not expressly provided for in the Indenture and of conveying,  assigning,
transferring,  mortgaging, pledging, setting over, and confirming to the Trustee
additional property of the Company, and  for any other purpose not  inconsistent
with the terms of the Indenture; and
 
    WHEREAS, the execution and delivery of this Supplemental Trust Indenture has
been  duly authorized by a  resolution adopted by the  Board of Directors of the
Company; and
 
    WHEREAS, the Trustee has duly determined to execute this Supplemental  Trust
Indenture  and to be bound, insofar as it  may lawfully do so, by the provisions
hereof;
 
    Now THEREFORE,  Northern  States  Power Company,  in  consideration  of  the
premises  and of  one dollar duly  paid to  it by the  Trustee at  or before the
ensealing and  delivery  of these  presents,  the  receipt of  which  is  hereby
acknowledged,  and other good and  valuable considerations, does hereby covenant
and agree  to and  with  Harris Trust  and Savings  Bank,  as Trustee,  and  its
successors in the trust under the Indenture for the benefit of those who hold or
shall  hold the  bonds, or  any of them,  issued or  to be  issued thereunder as
follows:
 
                                   ARTICLE I.
                 SPECIFIC SUBJECTION OF ADDITIONAL PROPERTY TO
                      THE LIEN OF THE ORIGINAL INDENTURE.
 
    SECTION 1.01. The Company in order to better secure the payment, of both the
principal and interest,  of all  bonds of the  Company at  any time  outstanding
under  the Indenture according to their tenor  and effect and the performance of
and compliance with the covenants and conditions contained in the Indenture, has
granted, bargained, sold, warranted, released, conveyed, assigned,  transferred,
mortgaged,  pledged, set over,  and confirmed and by  these presents does grant,
bargain, sell, warrant, release, convey, assign, transfer, mortgage, pledge, set
over, and confirm to the Trustee and to its respective successors in said  trust
forever,  subject to the rights reserved by the Company in and by the provisions
of the Indenture, all of the property described and mentioned or enumerated in a
schedule annexed hereto and marked Schedule A, reference to said schedule  being
made  hereby 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  and  in any  way  appertaining  to  the aforesaid
property or any part  thereof with the reversion  and reversions, remainder  and
remainders,  tolls, rents  and revenues,  issues, income,  products, and profits
thereof;
 
    Also, in order to subject the personal property and chattels of the  Company
to  the lien of the Indenture and to  conform with the provisions of the Uniform
Commercial Code,  all  fossil, nuclear,  hydro,  and other  electric  generating
plants,   including  buildings  and   other  structures,  turbines,  generators,
exciters, boilers, reactors,
<PAGE>
                                       6
 
nuclear fuel, other boiler plant  equipment, condensing equipment and all  other
generating   equipment;  substations;  electric  transmission  and  distribution
systems, including structures,  poles, towers,  fixtures, conduits,  insulators,
wires,  cables,  transformers,  services  and meters;  steam  heating  mains and
equipment; gas  transmission  and distribution  systems,  including  structures,
storage  facilities,  mains,  compressor stations,  purifier  stations, pressure
holders,  governors,  services,   and  meters;  telephone   plant  and   related
distribution systems; trucks and trailers; office, shop, and other buildings and
structures,  furniture and equipment; apparatus and equipment of all other kinds
and descriptions; materials  and supplies; all  municipal and other  franchises,
leaseholds, licenses, permits, privileges, patents and patent rights; all shares
of   stock,  bonds,  evidences  of  indebtedness,  contracts,  claims,  accounts
receivable, choses in  action and other  intangibles, all books  of account  and
other corporate records;
 
    Excluding,  however, all merchandise and  appliances heretofore or hereafter
acquired for the purpose of sale to customers and others;
 
    All the estate,  right, title, interest,  and claim, whatsoever,  at law  as
well  as in equity, which the Company now has or hereafter may acquire in and to
the aforesaid property and  every part and parcel  thereof subject, however,  to
the  right of the Company, until the happening of a completed default as defined
in Section 1 of Article  XIII of the Original  Indenture prior to the  Effective
Date  and upon the occurrence and continuation of a Completed Default as defined
in the Indenture on and  after the Effective Date,  to retain in its  possession
all shares of stock, notes, evidences of indebtedness, other securities and cash
not  expressly  required  by the  provisions  hereof  to be  deposited  with the
Trustee,  to  retain  in  its  possession  all  contracts,  bills  and  accounts
receivable,  motor cars, any stock of goods, wares and merchandise, equipment or
supplies acquired for the purpose of consumption in the operation, construction,
or repair  of any  of the  properties of  the Company,  and to  sell,  exchange,
pledge,  hypothecate, or  otherwise dispose  of any or  all of  such property so
retained in  its  possession  free  from the  lien  of  the  Indenture,  without
permission  or hindrance on the part of  the Trustee, or any of the bondholders.
No person in any dealings with the Company in respect of any such property shall
be charged with any notice or knowledge of any such completed default (prior  to
the  Effective Date) or  Completed Default (after the  Effective Date) under the
Indenture while the Company is in possession of such property. Nothing contained
herein or in the Indenture shall be  deemed or construed to require the  deposit
with,  or delivery to,  the Trustee of any  of such property,  except such as is
specifically required to be deposited with the Trustee by some express provision
of the Indenture;
 
    To have and to hold all  said property, real, personal, and mixed,  granted,
bargained,   sold,   warranted,  released,   conveyed,   assigned,  transferred,
mortgaged, pledged,  set over,  or confirmed  by the  Company as  aforesaid,  or
intended  so  to be,  to the  Trustee  and its  successors and  assigns forever,
subject, however, to permitted liens as defined in Section 5 of Article I of the
1937 Indenture prior to the Effective Date and to Permitted Encumbrances on  and
after the Effective Date and to the further reservations, covenants, conditions,
uses,  and trusts set forth in the Indenture; in trust nevertheless for the same
purposes and upon the same conditions as are set forth in the Indenture.
 
                                  ARTICLE II.
         FORM AND EXECUTION OF SERIES 2028 BONDS AND SERIES 2003 BONDS
 
    SECTION 2.01. There hereby is created,  for issuance under the Indenture,  a
series  of bonds designated Series  due March 1, 2028,  each of which shall bear
the descriptive  title "First  Mortgage Bond,  Series due  March 1,  2028"  (the
"Series  2028 Bonds"),  and the form  thereof shall  contain suitable provisions
with respect to  the matters hereafter  specified in this  Section. Series  2028
Bonds  shall be  substantially of  the tenor  and purport  hereinbefore recited.
Series 2028 Bonds shall mature March 1, 2028, and shall be issued as  registered
bonds  without coupons in denominations of a multiple of $1,000. The Series 2028
Bonds shall bear interest at the rate of 6 1/2% per annum payable  semi-annually
on  March 1 and September 1 of each  year, and the principal shall be payable at
the office  of  the Trustee  in  Chicago, Illinois,  or  at the  option  of  the
registered  owner at the agency of the Company in the Borough of Manhattan, City
and State of New York, in lawful money of the United States of America, and  the
interest  shall be payable in like money at the option of the person entitled to
such interest
<PAGE>
                                       7
 
either at said office of the Trustee  in Chicago, Illinois, or at the agency  of
the Company in the Borough of Manhattan, City and State of New York. Series 2028
Bonds,  shall  be dated  as  of the  interest  payment date  next  preceding the
authentication thereof  by the  Trustee except  that (i)  if any  bond shall  be
authenticated  before September 1, 1998, it shall  be dated as of March 1, 1998,
unless (iii) below is applicable, (ii) if  the Company shall at the time of  the
authentication  of a Series 2028 Bond, be  in default in the payment of interest
upon the Series 2028 Bonds, such Series 2028 Bond shall be dated as of the  date
of  the beginning of  the period for which  such interest is  so in default, and
(iii) as long as there is no existing default in the payment of interest on  the
Series  2028 Bonds, if  any Series 2028  Bond, shall be  authenticated after the
close of business on  any Record Date  but on or prior  to the interest  payment
date relating to such Record Date, it shall be dated as of such interest payment
date.
 
    As  long as there is  no existing default in the  payment of interest on the
Series 2028 Bonds, the person in whose name any Series 2028 Bond, is  registered
at the close of business on any Record Date with respect to any interest payment
date  shall be entitled to receive the interest payable on such interest payment
date notwithstanding  any  transfer  or  exchange  of  such  Series  2028  Bond,
subsequent  to the Record  Date and on  or prior to  such interest payment date,
except as and  to the extent  the Company shall  default in the  payment of  the
interest  due  on  such interest  payment  date,  in which  case  such defaulted
interest shall be paid  to the person  in whose name such  Series 2028 Bond,  is
registered  on a Special Record Date for  the payment of such defaulted interest
to be fixed  by the Trustee,  notice thereof  shall be given  to the  registered
holder  of any  Series 2028 Bond,  not less than  10 days prior  to such Special
Record Date,  or  may be  paid  at  any time  in  any other  lawful  manner  not
inconsistent  with  the requirements  of any  securities  exchange on  which the
Series 2028 Bonds may be listed, and upon such notice as may be required by such
exchange.
 
    The term "Record Date" as used  herein with respect to any interest  payment
date  (March 1 or September 1) shall mean  the February 18 prior to such March 1
or August 21  prior to such  September 1 unless  such February 18  or August  21
shall  not be a business  day, in which event "Record  Date" shall mean the next
preceding business day. The  term "business day" as  used herein shall mean  any
day  other than  a Saturday or  a Sunday or  a day  on which the  offices of the
Trustee in the City of Chicago,  Illinois, are closed pursuant to  authorization
of law.
 
    As  used in this Section 2.01, the term "default in the payment of interest"
means  failure  to  pay  interest  on  the  applicable  interest  payment   date
disregarding any period of grace permitted by the Indenture.
 
    The  "Special Record Date"  as used herein  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 Series 2028 Bond, 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 provided  in this  Section 2.01.  Thereupon the
Trustee shall  fix a  Special Record  Date  for the  payment of  such  defaulted
interest which shall be not more than 15 nor 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 the Series 2028  Bonds, at his address as it appears
in the bond 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 mailed as aforesaid, such defaulted interest shall be
paid to the persons in whose names the Series 2028 Bonds, are registered on such
Special Record  Date  and  shall  not  be  payable  pursuant  to  the  paragraph
immediately following in this Section 2.01.
 
    The  Company may make payment of any  defaulted interest in any other lawful
manner not  inconsistent with  the requirements  of any  securities exchange  on
which  the Series  2028 Bonds,  may be listed,  and upon  such notice  as may be
required by such  exchange, if,  after notice  is given  by the  Company to  the
Trustee  of the  proposed payment  pursuant to  this Section  2.01, such payment
shall be deemed practicable by the Trustee.
<PAGE>
                                       8
 
    SECTION 2.02. There hereby is created,  for issuance under the Indenture,  a
series  of bonds designated Series  due March 1, 2003,  each of which shall bear
the descriptive  title "First  Mortgage Bond,  Series due  March 1,  2003"  (the
"Series  2003 Bonds"),  and the form  thereof shall  contain suitable provisions
with respect to the matters hereafter specified in this Section. The Series 2003
Bonds shall be substantially of the tenor and purport hereinbefore recited.  The
Series  2003 Bonds shall mature March 1, 2003, and shall be issued as registered
bonds without coupons in denominations of a multiple of $1,000. The Series  2003
Bonds  shall bear interest at the rate of 5 7/8% per annum payable semi-annually
on March 1 and September 1 of each  year, and the principal shall be payable  at
the  office  of  the Trustee  in  Chicago, Illinois,  or  at the  option  of the
registered owner at the agency of the Company in the Borough of Manhattan,  City
and  State of New York, in lawful money of the United States of America, and the
interest shall be payable in like money at the option of the person entitled  to
such  interest either at said office of  the Trustee in Chicago, Illinois, or at
the agency of the  Company in the  Borough of Manhattan, City  and State of  New
York.  Series 2003 Bonds,  shall be dated  as of the  interest payment date next
preceding the authentication thereof by the Trustee except that (i) if any  bond
shall  be authenticated before September 1, 1998,  it shall be dated as of March
1, 1998, unless (iii) below is applicable, (ii) if the Company shall at the time
of the authentication of  a Series 2003  Bond, be in default  in the payment  of
interest  upon the Series 2003 Bonds, such Series 2003 Bond shall be dated as of
the date  of the  beginning of  the  period for  which such  interest is  so  in
default,  and (iii) as  long as there is  no existing default  in the payment of
interest  on  the  Series  2003  Bonds,  if  any  Series  2003  Bond,  shall  be
authenticated  after the close of business on any Record Date but on or prior to
the interest payment date relating to such Record Date, it shall be dated as  of
such interest payment date.
 
    As  long as there is  no existing default in the  payment of interest on the
Series 2003 Bonds, the person in whose name any Series 2003 Bond, is  registered
at the close of business on any Record Date with respect to any interest payment
date  shall be entitled to receive the interest payable on such interest payment
date notwithstanding  any  transfer  or  exchange  of  such  Series  2003  Bond,
subsequent  to the Record  Date and on  or prior to  such interest payment date,
except as and  to the extent  the Company shall  default in the  payment of  the
interest  due  on  such interest  payment  date,  in which  case  such defaulted
interest shall be paid  to the person  in whose name such  Series 2003 Bond,  is
registered  on a Special Record Date for  the payment of such defaulted interest
to be fixed  by the Trustee,  notice thereof  shall be given  to the  registered
holder  of any  Series 2003 Bond,  not less than  10 days prior  to such Special
Record Date,  or  may be  paid  at  any time  in  any other  lawful  manner  not
inconsistent  with  the requirements  of any  securities  exchange on  which the
Series 2003 Bonds may be listed, and upon such notice as may be required by such
exchange.
 
    The term "Record Date" as used  herein with respect to any interest  payment
date  (March 1 or September 1) shall mean  the February 18 prior to such March 1
or August 21  prior to such  September 1 unless  such February 18  or August  21
shall  not be a business  day, in which event "Record  Date" shall mean the next
preceding business day. The  term "business day" as  used herein shall mean  any
day  other than  a Saturday or  a Sunday or  a day  on which the  offices of the
Trustee in the City of Chicago,  Illinois, are closed pursuant to  authorization
of law.
 
    As  used in this Section 2.02, the term "default in the payment of interest"
means  failure  to  pay  interest  on  the  applicable  interest  payment   date
disregarding any period of grace permitted by the Indenture.
 
    The  "Special Record Date"  as used herein  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 Series 2003 Bond, 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 provided  in this  Section 2.02.  Thereupon the
Trustee shall  fix a  Special Record  Date  for the  payment of  such  defaulted
interest which shall be not more than 15 nor 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
<PAGE>
                                       9
 
mailed, first class postage prepaid, to each holder of the Series 2003 Bonds, at
his address as it appears in the bond  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 mailed as  aforesaid,
such  defaulted interest shall be paid to  the persons in whose names the Series
2003 Bonds, are registered on such Special Record Date and shall not be  payable
pursuant to the paragraph immediately following in this Section 2.02.
 
    The  Company may make payment of any  defaulted interest in any other lawful
manner not  inconsistent with  the requirements  of any  securities exchange  on
which  the Series  2003 Bonds,  may be listed,  and upon  such notice  as may be
required by such  exchange, if,  after notice  is given  by the  Company to  the
Trustee  of the  proposed payment  pursuant to  this Section  2.02, such payment
shall be deemed practicable by the Trustee.
 
    SECTION 2.03.  The Series  2028 Bonds  and  the Series  2003 Bonds  are  not
redeemable  prior to maturity  for any reason  and are not  subject to a sinking
fund.
 
    SECTION 2.04. The registered owner of any  Bond or Bonds, at his option  may
surrender  the same with other Bonds of such series at the office of the Trustee
in Chicago,  Illinois,  or at  the  agency of  the  Company in  the  Borough  of
Manhattan,  City  and State  of  New York,  or  elsewhere if  authorized  by the
Company, for cancellation, in exchange for other Bonds of such series of  higher
or  lower authorized denominations, but of  the same aggregate principal amount,
bearing interest from its date, and  upon receipt of any payment required  under
the  provisions of Section 2.05 hereof.  Thereupon the Company shall execute and
deliver to the Trustee and the Trustee shall authenticate and deliver such other
registered bonds to such registered  owner at its office  or at any other  place
specified as aforesaid.
 
    SECTION  2.05. No charge  shall be made  by the Company  for any exchange or
transfer of Bonds, other than for  taxes or other governmental charges, if  any,
that may be imposed in relation thereto.
 
    SECTION  2.06. The Bonds, shall be executed  on behalf of the Company by the
manual signature of  its President or  one of  its Vice Presidents  or with  the
facsimile  signature of its President, and its corporate seal shall be thereunto
affixed, or  printed,  lithographed,  or engraved  thereon,  in  facsimile,  and
attested  by  the manual  signature of  its  Secretary or  one of  its Assistant
Secretaries or with the facsimile signature of its Secretary. In case any of the
officers who shall have signed any Bonds  or attested the seal thereon or  whose
facsimile  signature shall be borne by the Bonds shall cease to be such officers
of the Company before the  Bonds so signed and  sealed actually shall have  been
authenticated   by  the  Trustee  or  delivered   by  the  Company,  such  Bonds
nevertheless may be issued, authenticated, and delivered with the same force and
effect as though the person  or persons who signed  such Bonds and attested  the
seal  thereon or whose facsimile signature is  borne by the Bonds had not ceased
to be such officer or officers of  the Company. Any Bond issuable hereunder  may
be  signed or attested by manual or facsimile signature in behalf of the Company
by such person as at the actual date of the execution of such Bond shall be  the
proper  officer of the  Company, although at  the date of  such Bond such person
shall not have been an officer of the Company.
<PAGE>
                                       10
 
    SECTION  2.07. (a) Except as provided in  subsections (c) and (g) below, the
registered holder of  all of the  Series 2028  Bonds and the  Series 2003  Bonds
shall be The Depository Trust Company ("DTC") and such Bonds shall be registered
in  the name  of Cede &  Co., as  nominee for DTC.  Payment of  principal of and
interest on any  Bonds registered in  the name of  Cede & Co.  shall be made  by
transfer  of New  York Federal  or equivalent  immediately available  funds with
respect to the Bonds to the account of Cede & Co. on each such payment date  for
the  respective series of Bonds  at the address indicated for  Cede & Co. in the
bond register kept by the Trustee for the respective series of Bonds.
 
    (b) The Series 2028 Bonds and the Series 2003 Bonds shall each be  initially
issued  in  the  form  of  a  separate  single  authenticated  fully  registered
certificate in the aggregate principal amount  of the Series 2028 Bonds and  the
Series  2003 Bonds, respectively.  Upon initial issuance,  the ownership of such
Bonds shall be registered in the bond  register kept by the Trustee in the  name
of  Cede & Co., as nominee of DTC. The Trustee and the Company may treat DTC (or
its nominee) as  the sole  and exclusive registered  holder of  the Series  2028
Bonds  and the Series 2003  Bonds, respectively, registered in  its name for the
purposes of payment of the  principal of and interest  on the Series 2028  Bonds
and  Series  2003 Bonds,  respectively, and  of giving  any notice  permitted or
required to  be given  to holders  under the  Indenture, except  as provided  in
Section 2.07(g) below; and neither the Trustee nor the Company shall be affected
by  any notice to the  contrary. Neither the Trustee  nor the Company shall have
any  responsibility  or  obligation  to  any  of  DTC's  participants  (each   a
"Participant"),  any person claiming a beneficial  ownership in the Bonds, under
or through DTC  or any  Participant (each a  "Beneficial Owner"),  or any  other
person  which is  not shown on  the bond  register maintained by  the Trustee as
being a  registered  holder,  with  respect  to  the  accuracy  of  any  records
maintained  by DTC or any Participant; the  payment of DTC or any Participant of
any amount in respect of the principal  of or interest on the Series 2028  Bonds
or  the Series 2003 Bonds, as the case  may be; any notice which is permitted or
required to be given  to registered holders under  the Indenture of Series  2028
Bonds  or the Series  2003 Bonds, as  the case may  be; or any  consent given or
other action taken by DTC as bondholder. The Trustee shall pay all principal  of
and  interest on the Bonds registered in the name of Cede & Co. only to or "upon
the order  of" DTC  (as that  term is  used in  the Uniform  Commercial Code  as
adopted  in Minnesota and  New York), and  all such payments  shall be valid and
effective to fully satisfy and discharge the Company's obligations with  respect
to  the principal of and  interest on such Series 2028  Bonds or the Series 2003
Bonds, as the case may be, to the extent  of the sum or sums so paid. Except  as
otherwise  provided in Sections 2.07(c) and (g)  below, no person other than DTC
shall receive authenticated bond certificates  evidencing the obligation of  the
Company  to make payments of principal of  and interest on the Series 2028 Bonds
or the Series  2003 Bonds,  as the  case may  be. Upon  delivery by  DTC to  the
Trustee  of written notice to the effect that DTC has determined to substitute a
new nominee  in place  of Cede  &  Co., and  subject to  the provisions  of  the
Indenture  with respect  to transfers of  bonds, the  word "Cede &  Co." in this
Supplemental Trust Indenture shall refer to such new nominee of DTC.
 
    (c) If the  Company in  its discretion  determines that  it is  in the  best
interest of the Beneficial Owners that they be able to obtain bond certificates,
the  Company  may notify  DTC and  the  Trustee, whereupon  DTC will  notify the
Participants of  the availability  through  DTC of  bond certificates.  In  such
event,  the  Trustee  shall issue,  transfer  and exchange  bond  certificate as
requested by  DTC in  appropriate amounts  pursuant to  Article II  of the  1937
Indenture  prior to the Effective Date, Article  II of the Restated Indenture on
and after  the  Effective Date  and  Section  2.04 of  this  Supplemental  Trust
Indenture.  The Company shall pay all costs in connection with the production of
bond certificates if the Company makes  such a determination under this  Section
2.07(c). DTC may determine to discontinue providing its services with respect to
the  Series 2028 Bonds  or the Series 2003  Bonds at any  time by giving written
notice to the Company and the Trustee and discharging its responsibilities  with
respect  thereto under applicable law. Under  such circumstances (if there is no
successor book-entry depository), the Company and the Trustee shall be obligated
(at the sole cost and expense of  the Company) to deliver bond certificates  for
such Series 2028 Bonds or Series 2003 Bonds, as the case may be, as described in
this  Supplemental  Trust  Indenture.  If  bond  certificates  are  issued,  the
provisions of the Indenture shall apply to, among other things, the transfer and
exchange of such  certificates and the  method of payment  and principal of  and
interest on such certificates. Whenever DTC requests the Company and the Trustee
to  do so, the Company will direct the  Trustee (at the sole cost and expense of
the Company) to cooperate with DTC in taking appropriate action after reasonable
notice (1) to make  available one or more  separate certificates evidencing  the
<PAGE>
                                       11
 
Series  2028  Bonds  or the  Series  2003 Bonds,  as  the  case may  be,  to any
Participant or  (2) to  arrange for  another book-entry  depository to  maintain
custody  of certificates  evidencing the  Series 2028  Bonds or  the Series 2003
Bonds, as the case may  be, registered in the name  of Cede & Co. Any  successor
book-entry  depository must be a clearing  agency registered with the Securities
and Exchange Commission pursuant to Section  17A of the Securities Exchange  Act
of  1934  and must  enter into  an agreement  with the  Company and  the Trustee
agreeing to act as the depository and clearing agency for the Series 2028  Bonds
or  the Series 2003  Bonds, as the case  may be, (except  as provided in Section
2.07(g) below). After such agreement has become effective, DTC shall present the
Series 2028 Bonds or the Series 2003 Bonds, as the case may be, for registration
of transfer in accordance with  Section 12 of Article  II of the 1937  Indenture
prior  to the Effective Date  and Section 2.12 of  the Restated Indenture on and
after the Effective Date, and the Trustee shall register them in the name of the
successor book-entry  depository  or  its nominee.  If  a  successor  book-entry
depository  has not  accepted such position  before the effective  date of DTC's
termination of its services, the book-entry system shall automatically terminate
and may not be reinstated without the  consent of all registered holders of  the
Series 2028 Bonds or the Series 2003 Bonds, as the case may be.
 
    (d) Notwithstanding any other provision of this Supplemental Trust Indenture
to  the contrary, so long as any Series 2028 Bonds are registered in the name of
Cede & Co., as nominee of DTC, all payments with respect to the principal of and
interest on such Series 2028 Bonds and  all notices with respect to such  Series
2028  Bonds shall  be made and  given, respectively,  to DTC as  provided in the
representation letter dated as of the date of delivery of the Series 2028  Bonds
among  DTC, the Company  and the Trustee.  The Trustee is  hereby authorized and
directed to comply with all terms of the representation letter.
 
    Notwithstanding any other provision of this Supplemental Trust Indenture  to
the  contrary, so long  as any Series 2003  Bonds are registered  in the name of
Cede & Co., as nominee of DTC, all payments with respect to the principal of and
interest on such Series 2003 Bonds and  all notices with respect to such  Series
2003  Bonds shall  be made and  given, respectively,  to DTC as  provided in the
representation letter dated as of the date of delivery of the Series 2003  Bonds
among  DTC, the Company  and the Trustee.  The Trustee is  hereby authorized and
directed to comply with all terms of the representation letter.
 
    (e) In connection  with any  notice or  other communication  to be  provided
pursuant  to the Indenture for the Series 2028 Bonds or the Series 2003 Bonds by
the Company or the  Trustee with respect  to any consent or  other action to  be
taken  by the  registered holders of  the Series  2028 Bonds or  the Series 2003
Bonds, the Company or the Trustee, as the case may be, shall seek to establish a
record date to the extent permitted by  the Indenture for such consent or  other
action  and  give DTC  notice of  such record  date not  less than  fifteen (15)
calendar days in advance of such record date to the extent possible. Such notice
to DTC shall be given only when DTC is the sole registered holder.
 
    (f) NEITHER THE  COMPANY NOR  THE TRUSTEE  WILL HAVE  ANY RESPONSIBILITY  OR
OBLIGATIONS TO THE PARTICIPANTS OR THE BENEFICIAL OWNERS WITH RESPECT TO (1) THE
ACCURACY OF ANY RECORDS MAINTAINED BY DTC OR ANY PARTICIPANT; (2) THE PAYMENT BY
DTC  OR ANY PARTICIPANT OF ANY AMOUNT DUE  TO ANY BENEFICIAL OWNER IN RESPECT OF
THE PRINCIPAL  OF OR  INTEREST ON  THE BONDS;  (3) THE  DELIVERY BY  DTC OR  ANY
PARTICIPANT OF ANY NOTICE TO ANY BENEFICIAL OWNER WHICH IS REQUIRED OR PERMITTED
UNDER  THE TERMS OF THE INDENTURE TO BE  GIVEN TO REGISTERED HOLDERS; OR (4) ANY
CONSENT GIVEN OR OTHER ACTION TAKEN BY DTC AS A REGISTERED HOLDER.
 
    SO LONG AS CEDE & CO. IS THE  REGISTERED HOLDER OF THE SERIES 2028 BONDS  AS
NOMINEE  OF DTC,  REFERENCES HEREIN TO  REGISTERED HOLDERS OF  SERIES 2028 BONDS
SHALL MEAN  CEDE  &  CO.  AND  SHALL NOT  MEAN  THE  BENEFICIAL  OWNERS  OF  THE
SERIES 2028 BONDS NOR DTC PARTICIPANTS.
 
    SO  LONG AS CEDE & CO. IS THE  REGISTERED HOLDER OF THE SERIES 2003 BONDS AS
NOMINEE OF DTC,  REFERENCES HEREIN TO  REGISTERED HOLDERS OF  SERIES 2003  BONDS
SHALL  MEAN  CEDE  &  CO.  AND  SHALL NOT  MEAN  THE  BENEFICIAL  OWNERS  OF THE
SERIES 2003 BONDS NOR DTC PARTICIPANTS.
<PAGE>
                                       12
 
    (g) The Company, in its sole  discretion, may terminate the services of  DTC
with  respect to the Series  2028 Bonds and/or Series  2003 Bonds if the Company
determines that:  (i)  DTC is  unable  to discharge  its  responsibilities  with
respect to the such Bonds; or (ii) a continuation of the requirement that all of
the outstanding Series 2028 Bonds or Series 2003 Bonds, as the case may be, must
be  registered with the  registration books kept  by the Trustee  in the name of
Cede & Co., as  nominee of DTC, is  not in the best  interest of the  Beneficial
Owners  of the Series 2028 Bonds or Series 2003 Bonds, as the case may be. After
such event  and if  no  substitute book-entry  depository  is appointed  by  the
Company, bond certificates will be delivered as described in the Indenture.
 
    (h)  Upon the termination of the services  of DTC with respect to the Series
2028 Bonds and/or the Series  2003 Bonds pursuant to  subsections (c) or (g)  of
this  Section 2.07 after which no substitute book-entry depository is appointed,
the Series  2028 Bonds  or Series  2003  Bonds, as  the case  may be,  shall  be
registered  in whatever name or names  holders transferring or exchanging Series
2028 Bonds  or  Series 2003  Bonds,  as the  case  may be,  shall  designate  in
accordance with the provisions of the Indenture.
 
                                  ARTICLE III.
                      APPOINTMENT OF AUTHENTICATING AGENT.
 
    SECTION  3.01. The Trustee  shall, if requested  in writing so  to do by the
Company, promptly  appoint an  agent or  agents of  the Trustee  who shall  have
authority  to authenticate registered  Bonds, in the  name and on  behalf of the
Trustee. Such appointment by the Trustee shall be evidenced by a certificate  of
a  vice-president  of  the  Trustee  delivered  to  the  Company  prior  to  the
effectiveness of such appointment.
 
    SECTION 3.02. (a)  Any such authenticating agent shall be acceptable to  the
Company  and at all  times shall be  a corporation which  is organized and doing
business under the  laws of the  United States  or of any  State, is  authorized
under  such laws  to act  as authenticating  agent, has  a combined  capital and
surplus of at least $10,000,000, and is 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  the aforesaid
supervising or examining authority, then for  the purposes of this Section  3.02
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.
 
    (b)  Any corporation  into which any 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 any authenticating  agent
shall be a party, or any corporation succeeding to the corporate agency business
of  any  authenticating agent,  shall continue  to  be the  authenticating agent
without the execution or filing of any paper  or any further act on the part  of
the Trustee or the authenticating agent.
 
    (c)   Any  authenticating agent  at any  time may  resign by  giving written
notice of resignation to the Trustee and to the Company. The Trustee may at  any
time,  and upon written request  of the Company to  the Trustee shall, terminate
the agency of any authenticating agent  by giving written notice of  termination
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  any
authenticating  agent  shall  cease  to  be  eligible  in  accordance  with  the
provisions  of this  Section 3.02,  the Trustee,  unless otherwise  requested in
writing by the Company, promptly shall appoint a successor authenticating agent,
which shall be  acceptable to  the Company. Any  successor authenticating  agent
upon  acceptance of its  appointment hereunder shall become  vested with all the
rights, powers, duties, and responsibilities of its predecessor hereunder,  with
like  effect as if originally named.  No successor authenticating agent shall be
appointed unless eligible under the provisions of this Section 3.02.
 
    (d)  The  Trustee agrees to  pay to any  authenticating agent, appointed  in
accordance with the provisions of this Section 3.02, reasonable compensation for
its  services,  and the  Trustee shall  be  entitled to  be reimbursed  for such
payments.
<PAGE>
                                       13
 
    SECTION  3.03. If an appointment  is made pursuant to  this Article III, the
registered Bonds,  shall have  endorsed thereon,  in addition  to the  Trustee's
Certificate, an alternate Trustee's Certificate in the following form:
 
    This bond is one of the bonds of the Series designated thereon, described in
the within-mentioned Indenture.
                                              HARRIS TRUST AND SAVINGS BANK,
                                                                   as Trustee,
 
                                          By
                                                  Authenticating Agent,
 
                                          By
                                                   Authorized Officer.
 
    SECTION  3.04. No provision of this Article III shall require the Trustee to
have at any time more than one such authenticating agent for any one State or to
appoint any such authenticating agent in the State in which the Trustee has  its
principal place of business.
 
                                  ARTICLE IV.
        FINANCING STATEMENT TO COMPLY WITH THE UNIFORM COMMERCIAL CODE.
 
    SECTION  4.01. The name and address of  the debtor and secured party are set
forth below:
 
           Debtor: Northern States Power Company
                  414 Nicollet Mall
                  Minneapolis, Minnesota 55401
 
           Secured Party: Harris Trust and Savings Bank, Trustee
                       111 West Monroe Street
                       Chicago, Illinois 60603
 
    NOTE:  Northern  States  Power  Company,  the  debtor  above  named,  is  "a
transmitting utility" under the Uniform Commercial Code as adopted in Minnesota,
North Dakota and South Dakota.
 
    SECTION 4.02. Reference to Article I hereof is made for a description of the
property  of the debtor covered by this  Financing Statement with the same force
and effect as if incorporated in this Section at length.
 
    SECTION 4.03.  The  maturity  dates  and  respective  principal  amounts  of
obligations  of the debtor secured and presently to be secured by the Indenture,
reference to all of which  for the terms and  conditions thereof is hereby  made
with  the same  force and  effect as  if incorporated  herein at  length, are as
follows.
 
<TABLE>
<CAPTION>
FIRST MORTGAGE BONDS                                                          PRINCIPAL AMOUNT
- ----------------------------------------------------------------------------  ----------------
<S>                                                                           <C>
Series due February 1, 1999.................................................   $  200,000,000
Series due October 1, 2001..................................................   $  150,000,000
Series due December 1, 2000.................................................   $  100,000,000
Series due March 1, 2002....................................................   $   50,000,000
Series due February 1, 2003.................................................   $   50,000,000
Series due April 1, 2003....................................................   $   80,000,000
Series due December 1, 2005.................................................   $   70,000,000
Resource Recovery Series I..................................................   $   18,400,000
Pollution Control Series J..................................................   $    5,450,000
Pollution Control Series K..................................................   $    3,400,000
</TABLE>
<PAGE>
 
                                       14
 
<TABLE>
<CAPTION>
FIRST MORTGAGE BONDS                                                          PRINCIPAL AMOUNT
- ----------------------------------------------------------------------------  ----------------
<S>                                                                           <C>
Pollution Control Series L..................................................   $    4,850,000
Series due July 1, 2025.....................................................   $  250,000,000
Pollution Control Series M..................................................   $   60,000,000
Pollution Control Series N..................................................   $   27,900,000
Pollution Control Series O..................................................   $   50,000,000
Pollution Control Series P..................................................   $   50,000,000
Series due March 1, 2028....................................................   $  150,000,000
Series due March 1, 2003....................................................   $  100,000,000
</TABLE>
 
    SECTION 4.04. This  financing Statement  is hereby  adopted for  all of  the
First Mortgage Bonds of the series mentioned above secured by said Indenture.
 
    SECTION   4.05.  The  1937  Indenture   and  the  prior  Supplemental  Trust
Indentures, as set forth below,  have been filed or  recorded in each and  every
office  in the States of Minnesota, North Dakota, and South Dakota designated by
law for  the filing  or recording  thereof in  respect of  all property  of  the
Company subject thereto:
 
    Original Indenture
      Dated February 1, 1937
 
    Supplemental Indenture
      Dated June 1, 1942
 
    Supplemental Indenture
      Dated February 1, 1944
 
    Supplemental Indenture
      Dated October 1, 1945
 
    Supplemental Indenture
      Dated July 1, 1948
 
    Supplemental Indenture
      Dated August 1, 1949
 
    Supplemental Indenture
      Dated June 1, 1952
 
    Supplemental Indenture
      Dated October 1, 1954
 
    Supplemental Indenture
      Dated September 1, 1956
 
    Supplemental Indenture
      Dated August 1, 1957
 
    Supplemental Indenture
      Dated July 1, 1958
 
    Supplemental Indenture
      Dated December 1, 1960
 
    Supplemental Indenture
      Dated August 1, 1961
 
    Supplemental Indenture
      Dated June 1, 1962
 
    Supplemental Indenture
      Dated September 1, 1963
 
    Supplemental Indenture
      Dated August 1, 1966
 
    Supplemental Indenture
      Dated June 1, 1967
 
    Supplemental Indenture
      Dated October 1, 1967
 
    Supplemental Indenture
      Dated May 1, 1968
 
    Supplemental Indenture
      Dated October 1, 1969
 
    Supplemental Indenture
      Dated February 1, 1971
 
    Supplemental Indenture
      Dated May 1, 1971
 
    Supplemental Indenture
      Dated February 1, 1972
 
    Supplemental Indenture
      Dated January 1, 1973
 
    Supplemental Indenture
      Dated January 1, 1974
 
    Supplemental Indenture
      Dated September 1, 1974
 
    Supplemental Indenture
      Dated April 1, 1975
 
    Supplemental Indenture
      Dated May 1, 1975
 
    Supplemental Indenture
      Dated March 1, 1976
 
    Supplemental Indenture
      Dated June 1, 1981
 
    Supplemental Indenture
      Dated December 1, 1981
 
    Supplemental Indenture
      Dated May 1, 1983
 
    Supplemental Indenture
      Dated December 1, 1983
 
    Supplemental Indenture
      Dated September 1, 1984
<PAGE>
                                       15
 
    Supplemental Indenture
      Dated December 1, 1984
 
    Supplemental Indenture
      Dated May 1, 1985
 
    Supplemental Indenture
      Dated September 1, 1985
 
    Supplemental and Restated Indenture
      Dated May 1, 1988
 
    Supplemental Indenture
      Dated July 1, 1989
 
    Supplemental Indenture
      Dated June 1, 1990
 
    Supplemental Indenture
      Dated October 1, 1992
 
    Supplemental Indenture
      Dated April 1, 1993
 
    Supplemental Indenture
      Dated December 1, 1993
 
    Supplemental Indenture
      Dated February 1, 1994
 
    Supplemental Indenture
      Dated October 1, 1994
 
    Supplemental Indenture
      Dated June 1, 1995
 
    Supplemental Indenture
      Dated April 1, 1997
 
    SECTION  4.06. The property  covered by this  Financing Statement also shall
secure additional series  of First  Mortgage Bonds of  the debtor  which may  be
issued  from time to time in the future in accordance with the provisions of the
Indenture.
 
                                   ARTICLE V.
                            AMENDMENTS TO INDENTURE.
 
    SECTION 5.01.  Each holder  or registered  owner  of a  bond of  any  series
originally  authenticated by  the Trustee and  originally issued  by the Company
subsequent to May 1, 1985 and of any coupon pertaining to any such bond, by  the
acquisition,  holding or ownership of such bond and coupon, thereby consents and
agrees to,  and  shall  be  bound  by, the  provisions  of  Article  VI  of  the
Supplemental  Indenture dated May 1, 1985. Each  holder or registered owner of a
bond of any series (including the Series  2028 Bonds and the Series 2003  Bonds)
originally  authenticated by  the Trustee and  originally issued  by the Company
subsequent to May  1, 1988 and  of any coupon  pertaining to such  bond, by  the
acquisition,  holding or ownership of such bond and coupon, thereby consents and
agrees to,  and  shall be  bound  by, the  provisions  of the  Supplemental  and
Restated Trust Indenture dated May 1, 1988 upon the Effective Date.
 
                                  ARTICLE VI.
                                 MISCELLANEOUS.
 
    SECTION  6.01.  The recitals  of fact  herein, except  the recital  that the
Trustee has duly determined to execute this Supplemental Trust Indenture and  be
bound,  insofar as it  may lawfully so do,  by the provisions  hereof and in the
bonds shall be taken as statements of the Company and shall not be construed  as
made  by the Trustee. The Trustee makes no representations as to value of any of
the property subjected to the lien of the Indenture, or any part thereof, or  as
to  the title of the Company thereto, or as to the security afforded thereby and
hereby, or as to  the validity of  this Supplemental Trust  Indenture or of  the
bonds  issued  under  the  Indenture  by  virtue  hereof  (except  the Trustee's
certificate), and the Trustee shall incur  no responsibility in respect of  such
matters.
 
    SECTION  6.02.  This  Supplemental  Trust Indenture  shall  be  construed in
connection with and  as a part  of the  1937 Indenture, as  supplemented by  the
Supplemental  Trust Indentures dated June 1,  1942, February 1, 1944, October 1,
1945, July 1, 1948, August 1, 1949, June 1, 1952, October 1, 1954, September  1,
1956,  August 1, 1957, July  1, 1958, December 1, 1960,  August 1, 1961, June 1,
1962, September 1, 1963, August 1, 1966,  June 1, 1967, October 1, 1967, May  1,
1968,  October 1, 1969, February 1, 1971, May 1, 1971, February 1, 1972, January
1, 1973, January 1, 1974, September 1,  1974, April 1, 1975, May 1, 1975,  March
1,  1976,  June  1, 1981,  December  1, 1981,  May  1, 1983,  December  1, 1983,
September 1, 1984, December 1, 1984, May 1, 1985,
<PAGE>
                                       16
 
September 1, 1985, the  Supplemental and Restated Trust  Indenture dated May  1,
1988  and the Supplemental  Trust Indentures dated  July 1, 1989,  June 1, 1990,
October 1, 1992, April 1, 1993, December  1, 1993, February 1, 1994, October  1,
1994, June 1, 1995, April 1, 1997 and March 1, 1997.
 
    SECTION  6.03. (a)  If any  provision of  this Supplemental  Trust Indenture
limits, qualifies, or conflicts with another provision of the Indenture required
to be included in indentures qualified under the Trust Indenture Act of 1939 (as
enacted prior to the date  of this Supplemental Trust  Indenture) by any of  the
provisions  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
Trust Indenture or in the bonds 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  6.04.  Wherever  in  this  Supplemental  Trust  Indenture  the word
"Indenture" is used  without the prefix,  "1937," "Original" or  "Supplemental",
such  word  was used  intentionally  to include  in  its meaning  both  the 1937
Indenture and all indentures supplemental thereto.
 
    SECTION 6.05. Wherever in  this Supplemental Trust  Indenture either of  the
parties  hereto is  named or referred  to, this  shall be deemed  to include the
successors or assigns  of such party,  and all the  covenants and agreements  in
this Supplemental Trust 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.
 
    SECTION  6.06.  (a)  This  Supplemental  Trust  Indenture  may  be  executed
simultaneously in several counter-
parts,  and all said  counterparts executed and delivered,  each as an original,
shall constitute but one and the same instrument.
 
    (b) The  Table of  Contents  and the  descriptive  headings of  the  several
Articles  of  this  Supplemental  Trust  Indenture  were  formulated,  used, and
inserted in this Supplemental Trust Indenture for convenience only and shall not
be deemed to affect the meaning or construction of any of the provisions hereof.
                                 --------------
 
    The amount of  obligations to  be issued  forthwith under  the Indenture  is
$250,000,000.
                                 --------------
<PAGE>
                                       17
 
    IN  WITNESS WHEREOF, on this  10th day of March,  A.D. 1998, NORTHERN STATES
POWER COMPANY, a Minnesota corporation, party of the first part, has caused  its
corporate  name and  seal to  be hereunto  affixed, and  this Supplemental Trust
Indenture dated  March  1,  1998, to  be  signed  by its  President  or  a  Vice
President,  and attested by its Secretary or  an Assistant Secretary, for and in
its behalf,  and HARRIS  TRUST AND  SAVINGS BANK,  an Illinois  corporation,  as
Trustee,  party of  the second  part, to  evidence its  acceptance of  the trust
hereby created, has caused its corporate  name and seal to be hereunto  affixed,
and  this Supplemental Trust Indenture dated March  1, 1998, 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.
 
<TABLE>
<S>                                       <C>
                                          NORTHERN STATES POWER COMPANY,
 
                                          BY EDWARD J. MCINTYRE, VICE PRESIDENT
 
Attest:
 
SUTTON A. PLOMBON, ASSISTANT SECRETARY.
 
Executed by Northern States
Power Company in presence of:
 
                                                                (CORPORATE SEAL)
 
MARY SCHELL, WITNESS
 
KEN BODELL, WITNESS                               HARRIS TRUST AND SAVINGS BANK,
                                                                      as Trustee
 
                                          BY K. HEALEY, VICE PRESIDENT
 
Attest:
 
D. G. DONOVAN, ASSISTANT SECRETARY.
 
Executed by Harris Trust and Savings
Bank in presence of:
 
                                                                (CORPORATE SEAL)
 
J. KINNEY, WITNESS
 
R. JOHNSON, WITNESS
</TABLE>
<PAGE>
                                       18
 
<TABLE>
<S>                   <C>
STATE OF MINNESOTA
COUNTY OF HENNEPIN    ss.:
</TABLE>
 
    On  this 10th day of March, A.D.  1998, before me, FAYE WAHLSTRAND, a Notary
Public in and for said County in the State aforesaid, personally appeared EDWARD
J. MCINTYRE and SUTTON A. PLOMBON, to me personally known, and to me known to be
Vice President and Assistant Secretary,  respectively, of Northern States  Power
Company,  one of the corporations described in and which executed the within and
foregoing instrument, and who,  being by me severally  duly sworn, each did  say
that he, the said EDWARD J. MCINTYRE is Vice President, and she, the said SUTTON
A.  PLOMBON, is  Assistant Secretary, of  said Northern States  Power Company, a
corporation; that the seal affixed to the within and foregoing instrument is the
corporate seal of  said corporation, and  that said instrument  was executed  in
behalf  of said  corporation by  authority of its  board of  directors; and said
EDWARD J. MCINTYRE and SUTTON A. PLOMBON each acknowledged said instrument to be
the free act and deed of said corporation and that such corporation executed the
same.
 
    WITNESS my hand and notarial seal this 10th day of March, A.D. 1998.
 
FAYE WAHLSTRAND
NOTARY PUBLIC, HENNEPIN COUNTY, MINN.
MY COMMISSION EXPIRES JANUARY 31, 2000
 
                        (NOTARIAL SEAL)
 
<TABLE>
<S>                   <C>
STATE OF MINNESOTA
COUNTY OF HENNEPIN    ss.:
</TABLE>
 
    EDWARD J. MCINTYRE and SUTTON A.  PLOMBON, being severally duly sworn,  each
deposes  and says that he,  the said EDWARD J.  MCINTYRE, is Vice President, and
she, the said  SUTTON A.  PLOMBON, is  Assistant Secretary,  of Northern  States
Power  Company, the corporation  described in and which  executed the within and
foregoing Supplemental  Trust  Indenture, as  mortgagor;  and each  for  himself
further  says that said Supplemental Trust Indenture was executed in good faith,
and not for the  purpose of hindering, delaying,  or defrauding any creditor  of
the said mortgagor.
 
    Subscribed and sworn to before me this 10th day of March, A.D. 1998.
 
FAYE WAHLSTRAND
NOTARY PUBLIC, HENNEPIN COUNTY, MINN.
MY COMMISSION EXPIRES JANUARY 31, 2000
 
                        (NOTARIAL SEAL)
<PAGE>
                                       19
 
<TABLE>
<S>                <C>
STATE OF ILLINOIS
COUNTY OF COOK     ss.:
</TABLE>
 
    On  this 10th  day of March,  A.D. 1998,  before me, M.  TINERELLA, a Notary
Public in and  for said County  in the State  aforesaid, personally appeared  K.
HEALEY  and D.G.  DONOVAN, to me  personally known, and  to me known  to be Vice
President and Assistant  Secretary, respectively,  of Harris  Trust and  Savings
Bank,  one of the  corporations described in  and which executed  the within and
foregoing instrument, and who, being by  me severally duly sworn, each, did  say
that  he, the said K. HEALEY, is Vice  President, and he, the said D.G. DONOVAN,
is Assistant Secretary, of  said Harris Trust and  Savings Bank, a  corporation;
that  the seal affixed to  the within and foregoing  instrument is the corporate
seal of said  corporation, and that  said instrument was  executed in behalf  of
said  corporation by authority of its board of directors; and said K. HEALEY and
D.G. DONOVAN each acknowledged said  instrument to be the  free act and deed  of
said corporation and that such corporation executed the same.
 
    WITNESS my hand and notarial seal this 10th day of March, A.D. 1998.
 
                                          M. TINERELLA
                                          NOTARY PUBLIC, COOK COUNTY, ILLINOIS.
                                          MY COMMISSION EXPIRES MAY 21, 2001
 
(NOTARIAL SEAL)
 
<TABLE>
<S>                <C>
STATE OF ILLINOIS
COUNTY OF COOK     ss.:
</TABLE>
 
    K.  HEALEY and  D.G. DONOVAN, being  severally duly sworn,  each for himself
deposes and says that  he, the said  K. HEALEY, is Vice  President, and he,  the
said D.G. DONOVAN, is Assistant Secretary, of Harris Trust and Savings Bank, the
corporation   described  in  and   which  executed  the   within  and  foregoing
Supplemental Trust Indenture, as  mortgagor; and each  for himself further  says
that  said Supplemental Trust Indenture was executed  in good faith, and not for
the purpose of hindering, delaying, or defrauding any creditor of the mortgagor.
 
    Subscribed and sworn to before me this 10th day of March, A.D. 1998.
 
K. HEALEY
D.G. DONOVAN
 
                                          M. TINERELLA
                                          NOTARY PUBLIC, COOK COUNTY, ILLINOIS.
                                          MY COMMISSION EXPIRES MAY 21, 2001
 
(NOTARIAL SEAL)
<PAGE>
                                      A-1
 
                                   SCHEDULE A
 
    The property referred to  in Article I of  the foregoing Supplemental  Trust
Indenture  from Northern States Power Company  to Harris Trust and Savings Bank,
Trustee, made as of March 1,  1998, includes the following property  hereinafter
more specifically described. Such description, however, is not intended to limit
or  impair the scope  or intention of  the general description  contained in the
granting clauses or elsewhere in the Original Indenture.
 
                    I.  PROPERTIES IN THE STATE OF MINNESOTA
 
    The following  described real  property,  situate, lying  and being  in  the
County of Chisago, to-wit:
 
    1. That  part of the  Northwest Quarter of the  Northwest Quarter of Section
       29, Township 33 North, Range 21 West, described as follows: Beginning  at
       the  Northwest corner of Section 29;  thence East (assumed bearing) along
       the North line of said Section 29 a distance of 279.40 feet; thence South
       26 degrees 56 minutes  East, a distance of  518.27 feet; thence North  63
       degrees 11 minutes East a distance of 35.00 feet; thence South 26 degrees
       56  minutes East  a distance  of 14.00 feet;  thence South  63 degrees 11
       minutes West a distance of 611.07 feet  to the West line of said  Section
       29;  thence North 00  degrees 29 minutes  50 seconds West  along the said
       West line a distance of 734.45 feet to the point of beginning.
 
    The following  described real  property,  situate, lying  and being  in  the
County of Hennepin, to-wit:
 
    1. Lot 32 and the Easterly 17.4 feet of Lot 33 Koehler's Addition to Mound.
 
    The  following  described real  property, situate,  lying  and being  in the
County of Washington, to-wit:
 
    1. Lots Five (5), Six (6), Seven (7), Eight (8), Nine (9), Ten (10),  Eleven
       (11) and Twelve (12), Block Eleven (11), of OAK PARK.
 
    2. Lots One (1), Two (2), Three (3), Four (4), Thirteen (13), Fourteen (14),
       Fifteen (15), and Sixteen (16), Block Eleven (11), OAK PARK.
 
    3. Lots  Five (5), Six (6), Seven (7), and Eight (8), Block Twelve (12), OAK
       PARK.
 
                   II.  GAS DISTRIBUTION LINES OF THE COMPANY
                           IN THE STATE OF MINNESOTA
 
    1. Approximately 2,000 feet of 6" diameter, and approximately 7,000 feet  of
       4" diameter high pressure gas main, constructed in 1997 in Ramsey County,
       known  as the 'Highway  10 Line', serving  a portion of  the community of
       Blaine in Anoka County, Minnesota.
<PAGE>
                                      A-2
 
                                 --------------
 
                         MORTGAGOR'S RECEIPT FOR COPY.
 
    The undersigned Northern  States Power Company,  the Mortgagor described  in
the foregoing Mortgage, hereby acknowledges that at the time of the execution of
the  Mortgage, Harris Trust  and Savings Bank,  Trustee, the Mortgagee described
therein, surrendered to  it a  full, true, complete,  and correct  copy of  said
instrument, with signatures, witnesses, and acknowledgments thereon shown.
 
                                              NORTHERN STATES POWER COMPANY.
 
                                          BY EDWARD J. MCINTYRE, VICE PRESIDENT
 
Attest:
 
SUTTON A. PLOMBON, ASSISTANT SECRETARY
 
                                 --------------
 
    This  instrument was drafted by Northern  States Power Company, 414 Nicollet
Mall, Minneapolis, Minnesota 55401.
 
    Tax statements for the real property described in this instrument should  be
sent to Northern States Power Company, 414 Nicollet Mall, Minneapolis, Minnesota
55401.

<PAGE>

                                                                 Exhibit 12.01

                NORTHERN STATES POWER COMPANY AND SUBSIDIARY COMPANIES
                             STATEMENT OF COMPUTATION OF
                          RATIO OF EARNINGS TO FIXED CHARGES


<TABLE>
<CAPTION>

                                           1997           1996          1995           1994            1993
                                       -----------     ----------     ---------     ------------   -----------
                                                                (Thousands of dollars)
<S>                                     <C>            <C>            <C>            <C>           <C>
Earnings
   Income from continuing                                                
   operations before accounting                   
   change                               $  237,320     $  274,539     $  275,795     $  243,475    $   211,740
Add   
   Taxes based on income (1)                      
      Federal income taxes                 105,733        153,515        142,492        112,611         99,952
      State income taxes                    23,008         40,635         34,988         35,746         28,076
      Deferred income taxes-net             (5,902)       (30,561)       (11,076)        (6,100)        12,256
      Tax credits - net                    (26,363)       (17,395)       (14,409)       (13,049)        (9,544)
      Foreign income taxes                     236            616            233            219 
   Fixed charges                           169,377        141,961        133,328        115,083        113,562
Deduct   
   Undistributed equity in earnings of            
      unconsolidated investees               5,364         25,976         41,870         23,588          1,142
                                        ----------     ----------     ----------     ----------     ----------

         Earnings                       $  498,045     $  537,334     $  519,481     $  464,397    $   454,900
                                        ----------     ----------     ----------     ----------     ----------
                                        ----------     ----------     ----------     ----------     ----------


Fixed charges                                     
   Interest charges per                           
      statement of income               $  169,377     $  141,961     $  133,328     $  115,083    $   113,562
                                        ----------     ----------     ----------     ----------     ----------
                                        ----------     ----------     ----------     ----------     ----------

      
Ratio of earnings to fixed                        
   charges                                     2.9            3.8            3.9            4.0            4.0
                                        ----------     ----------     ----------     ----------     ----------
                                        ----------     ----------     ----------     ----------     ----------

</TABLE>

(1) Includes income taxes included in Other Income (Expense).  
      




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