NORTHERN STATES POWER CO /MN/
424B5, 1995-06-29
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
                                          Filed Pursuant to Rule 424(b)(5)
                                          File No. 33-51593
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED JUNE 28, 1995)

                                  $250,000,000
                         NORTHERN STATES POWER COMPANY
                           (A MINNESOTA CORPORATION)
                                 --------------

              7 1/8% FIRST MORTGAGE BONDS, SERIES DUE JULY 1, 2025
                                ----------------

                     Interest Payable January 1 and July 1
                              -------------------

    Interest  on the 7 1/8%  First Mortgage Bonds, Series  due July 1, 2025 (the
"Offered Bonds") is payable
on January 1 and July  1 of each year, commencing  January 1, 1996. The  Offered
Bonds  are not  redeemable prior to  maturity. See  "Supplemental Description of
Offered Bonds".

    The Offered Bonds will be represented by global bonds registered in the name
of a nominee of The Depository Trust Company, as depository ("DTC").  Beneficial
interests  in the Offered Bonds will be  shown on, and transfers thereof will be
effected only through, records maintained by DTC (with respect to  participants'
interests)  and  its  participants.  Except  as  described  in  the accompanying
Prospectus, Offered Bonds in  certificated form will not  be issued in  exchange
for the global bonds.
                              -------------------

THESE  SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES AND
  EXCHANGE COMMISSION  OR  ANY  STATE SECURITIES  COMMISSION  NOR  HAS  THE
     SECURITIES   AND  EXCHANGE   COMMISSION  OR   ANY  STATE  SECURITIES
       COMMISSION  PASSED  UPON  THE  ACCURACY  OR  ADEQUACY  OF  THIS
          PROSPECTUS    SUPPLEMENT    OR   THE    PROSPECTUS.   ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

<TABLE>
<CAPTION>
                                                                            UNDERWRITING
                                                          PRICE TO         DISCOUNTS AND        PROCEEDS TO
                                                         PUBLIC (1)       COMMISSIONS (2)      COMPANY (1)(3)
<S>                                                  <C>                 <C>                 <C>
Per Bond...........................................       99.068%              .410%              98.658%
Total..............................................     $247,670,000         $1,025,000         $246,645,000
<FN>
(1)  Plus accrued interest from July 1, 1995.
(2)  The Company  has  agreed  to indemnify  the  Underwriters  against  certain
     liabilities,  including liabilities  under the  Securities Act  of 1933, as
     amended.
(3)  Before deducting estimated expenses of $526,250 payable by the Company.
</TABLE>

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

    The Offered  Bonds  are offered  subject  to prior  sale,  when, as  and  if
delivered to and accepted by the Underwriters and subject to approval of certain
legal  matters by  counsel for  the Underwriters.  The Underwriters  reserve the
right to withdraw, cancel or modify such offer and to reject orders in whole  or
in  part. It is expected that delivery of the Offered Bonds will be made through
the book-entry facilities of The Depository Trust Company in New York, New  York
on or about July 7, 1995.

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

PAINEWEBBER INCORPORATED

                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION

                                                                 LEHMAN BROTHERS
<PAGE>
            THE DATE OF THIS PROSPECTUS SUPPLEMENT IS JUNE 28, 1995.
<PAGE>
    IN  CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE  MARKET PRICE OF THE OFFERED  BONDS
OR  ANY  OTHER SECURITIES  OF  THE COMPANY  AT  LEVELS ABOVE  THOSE  WHICH MIGHT
OTHERWISE PREVAIL IN  THE OPEN MARKET.  SUCH STABILIZING, IF  COMMENCED, MAY  BE
DISCONTINUED AT ANY TIME.
                              -------------------

                                USE OF PROCEEDS

    The net proceeds from the sale of $250,000,000 in aggregate principal amount
of  the Offered  Bonds will  be added to  the general  funds of  the Company and
applied to the redemption of (i)  $98,000,000 aggregate principal amount of  its
9  1/8%  First Mortgage  Bonds, Series  due  July 1,  2019 and  (ii) $70,000,000
aggregate principal amount of its 9  3/8% First Mortgage Bonds, Series due  June
1,  2020.  The balance  of the  net proceeds  will be  used to  repay short-term
borrowings.

                   SUPPLEMENTAL DESCRIPTION OF OFFERED BONDS

    The following  description of  the  particular terms  of the  Offered  Bonds
supplements the description of the general terms and provisions of the New Bonds
set  forth in the accompanying Prospectus  under the caption "Description of New
Bonds," to  which description  reference  is hereby  made. The  following  brief
summaries  of certain provisions contained  in the Supplemental Trust Indenture,
dated June  1,  1995, relating  to  the  Offered Bonds  (the  "New  Supplemental
Indenture")  do not purport to be complete, use certain terms defined in the New
Supplemental Indenture, and are qualified in their entirety by express reference
to the  provisions of  the  New Supplemental  Indenture. Capitalized  words  not
defined  herein are used  as defined in  the accompanying Prospectus  or the New
Supplemental Indenture.

GENERAL
    Interest on the Offered Bonds at the annual rate set forth on the cover page
of this  Prospectus Supplement  will accrue  from July  1, 1995,  and is  to  be
payable  semi-annually  on January  1  and July  1,  beginning January  1, 1996.
Subject to certain exceptions, the  New Supplemental Indenture provides for  the
payment  of interest on the interest payment date only to persons in whose names
the Offered Bonds are registered  on the Record Date  (the December 21 prior  to
January  1 and  the June  20 prior  to July 1  unless any  Record Date  is not a
Business Day, in which event the Record Date will be the next preceding Business
Day).

REDEMPTION AND SINKING FUND PROVISIONS

    The Offered Bonds will not be redeemable  prior to maturity and will not  be
subject to a sinking fund.

BOOK-ENTRY BONDS

    The  Offered  Bonds  will  be issued  initially  as  global  securities and,
accordingly, will be represented by two fully-registered global securities  (the
"Global Securities") in the aggregate principal amount of the Offered Bonds. The
Global  Securities  will  be  deposited  with, or  on  behalf  of,  DTC,  or its
successor, as depository (the "Depository"), and  registered in the name of  the
Depository or a nominee of the Depository.

    So  long as  the Depository, or  its nominee,  is the registered  owner of a
Global Security, such Depository or  such nominee, as the  case may be, will  be
considered  the owner  of such Global  Security for all  purposes, including any
notices and voting. Except in the  circumstances described below, the owners  of
beneficial  interests in  a Global  Security will  not be  entitled to  have any
individual Offered  Bonds registered  in their  names, will  not receive  or  be
entitled  to receive physical delivery of any such Offered Bonds and will not be
considered the owners of  Offered Bonds under  the Indenture. Accordingly,  each
person  holding a  beneficial interest  in a  Global Security  must rely  on the
procedures of the Depository and, if such person is not a Direct Participant (as
defined below),  on procedures  of  the Direct  Participant through  which  such
person  holds its interest, to exercise any  of the rights of a registered owner
of such Offered Bonds.

    If the  Depository  is  at any  time  unwilling  or unable  to  continue  as
depository  and a successor depository is  not appointed, the Company will issue
individual  securities  in  certificated  form  ("Certificated  Securities")  in
exchange   for  the  Global  Security  or  Global  Securities  representing  the
corresponding book-entry  Offered  Bonds  represented  by  one  or  more  Global
Securities  and, in such  event, will issue  Certificated Securities in exchange
for the  Global Securities  representing  the corresponding  book-entry  Offered
Bonds.  Further, in such  event, an owner  of a beneficial  interest in a Global
Security representing book-entry Offered Bonds

                                      S-2
<PAGE>
may, on  terms acceptable  to the  Company and  the Depository  for such  Global
Security,  receive such book-entry Offered  Bonds as Certificated Securities. In
any such  instance, an  owner of  a  beneficial interest  in a  Global  Security
representing  book-entry Offered Bonds will be  entitled to physical delivery of
individual Certificated Securities equal in principal amount to such  beneficial
interest and to have such Certificated Securities registered in the name of such
owner.  Certificated Securities will be issued as fully registered Offered Bonds
in denominations of $1,000.

    DTC will act as securities depository for the Global Securities. The Offered
Bonds will be registered in the name of Cede & Co. (DTC's partnership  nominee).
Two  fully-registered  Global  Securities  certificates will  be  issued  in the
aggregate principal amount of the Offered Bonds, and will be deposited with DTC.

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

    Purchases  of the Global Securities under the  DTC system must be made by or
through Direct Participants, which will receive  a credit for such purchases  of
Global  Securities  on  DTC's records.  The  ownership interest  of  each actual
purchaser of each Global Security ("Beneficial Owner") is in turn to be recorded
on the Direct  and Indirect  Participants' records. Beneficial  Owners will  not
receive  written confirmation from DTC of  their purchase, but Beneficial Owners
are  expected  to  receive  written  confirmations  providing  details  of   the
transaction,  as well as periodic statements  of their holdings, from the Direct
or Indirect  Participant through  which the  Beneficial Owner  entered into  the
transaction. Transfers of ownership interests in the Global Securities are to be
accomplished  by entries made on  the books of Participants  acting on behalf of
Beneficial Owners. Beneficial Owners will not receive certificates  representing
their ownership interests in the Global Securities, except in the event that use
of the book-entry system for the Global Securities is discontinued.

    To  facilitate  subsequent  transfers, all  Global  Securities  deposited by
Participants with DTC are registered in  the name of DTC's partnership  nominee,
Cede  & Co. The deposit of the Global Securities with DTC and their registration
in the name of Cede & Co. effect  no change in beneficial ownership. DTC has  no
knowledge  of  the  actual Beneficial  Owners  of the  Global  Securities; DTC's
records reflect only the identity of  the Direct Participants to whose  accounts
such  Global Securities  are credited,  which may or  may not  be the Beneficial
Owners. The Participants will  remain responsible for  keeping account of  their
holdings on behalf of their customers.

    Conveyance   of  notices   and  other   communications  by   DTC  to  Direct
Participants, by Direct  Participants to  Indirect Participants,  and by  Direct
Participants  to Beneficial Owners will be  governed by arrangements among them,
subject to any  statutory or regulatory  requirements as may  be in effect  from
time to time.

    Neither  DTC nor Cede & Co. will consent  or vote with respect to the Global
Securities. Under  its usual  procedures,  DTC mails  an  Omnibus Proxy  to  the
Company  as soon as  possible after the  record date. The  Omnibus Proxy assigns
Cede & Co.'s consenting or voting  rights to those Direct Participants to  whose
accounts  the Global Securities are credited on the record date (identified in a
listing attached to the Omnibus Proxy).

    Principal and interest  payments on the  Global Securities will  be made  to
DTC.  DTC's practice is to credit  Direct Participants' accounts on payable date
in accordance with their respective holdings  shown on DTC's records unless  DTC
has reason to believe that it will not receive payment on payable date. Payments
by  Participants to Beneficial Owners will  be governed by standing instructions
and customary practices, as is the case with securities held for the accounts of
customers   in   bearer   form   or    registered   in   "street   name,"    and

                                      S-3
<PAGE>
will  be the responsibility of such Participant  and not of DTC, the Trustee, or
the Company, subject to  any statutory or regulatory  requirements as may be  in
effect from time to time. Payment of principal and interest on the Offered Bonds
represented  by Global Securities to DTC is the responsibility of the Company or
the Trustee. Disbursement of such payments  to Direct Participants shall be  the
responsibility  of  DTC, and  disbursement of  such  payments to  the Beneficial
Owners shall be the responsibility of Direct and Indirect Participants.

    DTC may discontinue  providing its  services as  securities depository  with
respect  to the Global Securities at any time by giving reasonable notice to the
Company or  the Trustee.  Under such  circumstances, if  a successor  securities
depository  is not obtained, Offered Bonds  in certificated form are required to
be printed and delivered.

    The information in this section  concerning DTC and DTC's book-entry  system
has  been  obtained from  DTC,  and the  Company  and the  Underwriters  take no
responsibility for the accuracy thereof.

    The Underwriters are Direct Participants of DTC.

    None  of  the  Company,  the  Trustee,  or  any  agent  for  payment  on  or
registration  of  transfer or  exchange  of any  Global  Security will  have any
responsibility or  liability  for any  aspect  of  the records  relating  to  or
payments  made on account of beneficial interests in such Global Security or for
maintaining, supervising or  reviewing any records  relating to such  beneficial
interests.

SAME-DAY SETTLEMENT AND PAYMENT
    Settlement  for  the  Offered Bonds  will  be  made by  the  Underwriters in
immediately available funds. All payments of principal and interest will be made
by the Company in immediately available funds.

    Secondary trading in long-term notes and debentures of corporate issuers  is
generally  settled in clearinghouse or next-day  funds. In contrast, the Offered
Bonds will trade in the DTC's Same-Day Funds Settlement System until maturity or
until the Offered Bonds  are issued in certificated  form, and secondary  market
trading  activity in  the Offered  Bonds will  therefore be  required by  DTC to
settle in  immediately available  funds. No  assurance can  be given  as to  the
effect, if any, of settlement in immediately available funds on trading activity
in the Offered Bonds.

                                      S-4
<PAGE>
                                  UNDERWRITING

    Subject  to the terms and conditions  set forth in an Underwriting Agreement
dated June 28, 1995  (the "Underwriting Agreement"), the  Company has agreed  to
sell  to each of the Underwriters named  below, and each of the Underwriters has
severally agreed to purchase,  the principal amount of  Offered Bonds set  forth
opposite its name below:

<TABLE>
<CAPTION>
      NAME                                                           AMOUNT
                                                                  ------------
<S>                                                               <C>
PaineWebber Incorporated........................................  $150,000,000
Donaldson, Lufkin & Jenrette Securities Corporation.............    50,000,000
Lehman Brothers.................................................    50,000,000
                                                                  ------------
      Total.....................................................  $250,000,000
                                                                  ------------
                                                                  ------------
</TABLE>

    The  Underwriting Agreement provides  that the Underwriters  are required to
take and pay for all of the Offered Bonds, if any are taken. The obligations  of
the  Underwriters are subject  to certain conditions precedent  set forth in the
Underwriting Agreement.

    The Underwriters have advised the Company as follows:

        The Underwriters  propose  to offer  the  Offered Bonds  to  the  public
    initially  at  the  offering price  set  forth  on the  cover  page  of this
    Prospectus Supplement and to certain dealers at such price less a concession
    not in excess of  .35% of the  principal amount of  such Offered Bonds.  The
    Underwriters  may allow, and  such dealers may reallow,  a concession not in
    excess of  .25%  to certain  other  dealers.  After the  Offered  Bonds  are
    released  for  sale  to  the  public,  the  public  offering  price  and the
    concessions to dealers may be changed by the Underwriters.

    The Company  has  agreed  to  indemnify  the  Underwriters  against  certain
liabilities, including liabilities under the Securities Act of 1933, as amended,
and  to  contribute to  payments the  Underwriters  may be  required to  make in
respect thereof.

    The Offered Bonds  of this  series are  a new  issue of  securities with  no
established  trading market. The Company does not intend to apply for listing of
the Offered  Bonds on  a  national securities  exchange. The  Underwriters  have
advised  the Company that they intend to make  a market in the Offered Bonds but
they are not obligated to  do so and may discontinue  market making at any  time
without  notice. No assurance  can be given  as to the  liquidity of the trading
market of the Offered Bonds.

                                      S-5
<PAGE>
                 (This page has been left blank intentionally.)
<PAGE>

                                   PROSPECTUS
                         NORTHERN STATES POWER COMPANY
                           (A MINNESOTA CORPORATION)
                              FIRST MORTGAGE BONDS

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

    Northern  States Power Company, a Minnesota corporation (the "Company"), may
offer for sale from time to  time up to $250,000,000 aggregate principal  amount
of  its First Mortgage Bonds (the "New Bonds"),  in one or more series, on terms
and in amounts to  be determined at  the time of  sale. The aggregate  principal
amount,  rate or rates (or method of calculation) and time or times and place of
payment of  interest, maturity  or maturities,  offering price,  any  redemption
terms  or other specific  terms of the series  of New Bonds  in respect of which
this Prospectus is being delivered (the "Offered Bonds") will be set forth in  a
supplement to this Prospectus (the "Prospectus Supplement").

    The Company may sell the New Bonds through underwriters or dealers, directly
to  a limited number of institutional purchasers or through agents. See "Plan of
Distribution." The  Prospectus  Supplement  will  set forth  the  names  of  any
underwriters,  dealers or  agents involved  in the  distribution of  the Offered
Bonds and any applicable  commissions or discounts and  the net proceeds to  the
Company from such sale.

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

  THESE   SECURITIES   HAVE  NOT   BEEN   APPROVED  OR   DISAPPROVED   BY  THE
   SECURITIES   AND   EXCHANGE   COMMISSION    OR   ANY   STATE    SECURITIES
     COMMISSION   NOR  HAS  THE  SECURITIES   AND  EXCHANGE  COMMISSION  OR
      ANY  STATE   SECURITIES   COMMISSION  PASSED   UPON   THE   ACCURACY
       OR    ADEQUACY    OF   THIS    PROSPECTUS.    ANY   REPRESENTATION
                          TO THE CONTRARY IS A CRIMINAL OFFENSE.

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

                  THE DATE OF THIS PROSPECTUS IS JUNE 28, 1995
<PAGE>
    NO DEALER,  SALESMAN  OR  OTHER  PERSON HAS  BEEN  AUTHORIZED  TO  GIVE  ANY
INFORMATION  OR  TO  MAKE  ANY REPRESENTATIONS  OTHER  THAN  THOSE  CONTAINED OR
INCORPORATED BY  REFERENCE  IN THIS  PROSPECTUS  AND,  IF GIVEN  OR  MADE,  SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY  THE  COMPANY OR  ANY  UNDERWRITER OR  AGENT.  NEITHER THE  DELIVERY  OF THIS
PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN
IMPLICATION THAT THERE HAS BEEN  NO CHANGE IN THE  AFFAIRS OF THE COMPANY  SINCE
THE  DATE HEREOF.  THIS PROSPECTUS  DOES NOT  CONSTITUTE AN  OFFER TO  SELL OR A
SOLICITATION OF AN OFFER TO BUY THE NEW BONDS IN ANY JURISDICTION TO ANY  PERSON
TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION IN SUCH JURISDICTION.

                             AVAILABLE INFORMATION

    The  Company is subject to the  informational requirements of the Securities
Exchange Act  of  1934, as  amended  (the  "Exchange Act"),  and  in  accordance
therewith  files  reports,  proxy  statements  and  other  information  with the
Securities and  Exchange  Commission  (the "Commission").  Such  reports,  proxy
statements  and  other  information  on  file can  be  inspected  at  the public
reference offices  of  the  Commission  currently at  450  Fifth  Street,  N.W.,
Washington,  D.C. 20549; 500 West Madison Street, Chicago, Illinois 60661; and 7
World Trade Center, New  York, New York  10048. Copies of  such material can  be
obtained  from the Public  Reference Section of the  Commission at its principal
office at 450 Fifth Street, N.W.,  Washington, D.C. 20549, at prescribed  rates.
In  addition,  reports,  proxy  material and  other  information  concerning the
Company may be inspected at the Library of the New York Stock Exchange, 20 Broad
Street, New York, New  York, at the  office of the  Chicago Stock Exchange,  440
South  LaSalle Street, Chicago, Illinois, and at the office of the Pacific Stock
Exchange, 301 Pine  Street, San  Francisco, California, on  which exchanges  the
Company's  Common Stock is listed. The Company is not required to, and does not,
provide annual reports  to holders  of its debt  securities unless  specifically
requested by a holder.

    The  Company has filed with the  Commission a registration statement on Form
S-3 (herein,  together with  all amendments  and exhibits,  referred to  as  the
"Registration  Statement") under  the Securities Act  of 1933,  as amended. This
Prospectus does not contain all of the information set forth in the Registration
Statement, certain parts of which are  omitted in accordance with the rules  and
regulations of the Commission. For further information, reference is made to the
Registration Statement.

                      DOCUMENTS INCORPORATED BY REFERENCE

    The  following  documents  filed  by the  Company  with  the  Commission are
incorporated by reference into this Prospectus:

        1.  The Company's Annual Report on Form 10-K for the year ended December
           31, 1994;

        2.  The Company's  Quarterly Report on Form  10-Q for the quarter  ended
           March 31, 1995; and

        3.   The Company's Current  Reports on Form 8-K  dated January 30, 1995,
           February 28, 1995, April 28, 1995 and June 27, 1995.

    All documents filed by the Company  pursuant to Section 13(a), 13(c), 14  or
15(d)  of the Exchange  Act after the date  of this Prospectus  and prior to the
termination of this offering shall be deemed to be incorporated by reference  in
this  Prospectus  from  the date  of  filing  of such  documents.  Any statement
contained in a document incorporated or  deemed to be incorporated by  reference
in  this Prospectus shall be deemed to be modified or superseded for purposes of
this Prospectus to the extent that  a statement contained in this Prospectus  or
in  any  other subsequently  filed document  which also  is or  is deemed  to be
incorporated  by  reference  in  the  Prospectus  modifies  or  supersedes  such
statement.  Any statement so modified or  superseded shall not be deemed, except
as so modified or superseded, to constitute a part of this Prospectus.

    THE COMPANY  WILL  PROVIDE WITHOUT  CHARGE  TO EACH  PERSON  (INCLUDING  ANY
BENEFICIAL OWNER) TO WHOM A COPY OF THIS PROSPECTUS HAS BEEN DELIVERED, UPON THE
WRITTEN  OR  ORAL REQUEST  OF ANY  SUCH  PERSON, A  COPY OF  ANY  OR ALL  OF THE
DOCUMENTS REFERRED TO ABOVE WHICH HAVE  BEEN INCORPORATED IN THIS PROSPECTUS  BY
REFERENCE,  OTHER  THAN EXHIBITS  TO SUCH  DOCUMENTS.  REQUESTS FOR  SUCH COPIES
SHOULD BE DIRECTED TO  THE ASSISTANT SECRETARY,  NORTHERN STATES POWER  COMPANY,
414 NICOLLET MALL, MINNEAPOLIS, MINNESOTA 55401 (612-330-5994).

                                       2
<PAGE>
                                      [LOGO]

    Northern States Power Company (the "Company") was incorporated in 1909 under
the  laws of Minnesota. Its executive offices  are located at 414 Nicollet Mall,
Minneapolis, Minnesota 55401. (Phone  612-330-5500). The Company's  subsidiaries
include  Northern States Power Company, an operating public utility incorporated
in  Wisconsin   ("NSP-Wisconsin"),  NRG   Energy,  Inc.   ("NRG"),  a   Delaware
corporation,  and  Viking  Gas  Transmission  Company,  a  Delaware  corporation
("Viking"). The Company and its subsidiaries collectively are referred to herein
as NSP.

    NSP is predominantly an operating public utility engaged in the  generation,
transmission  and distribution  of electricity  throughout a  49,000 square mile
service  area  and  the  distribution  of  natural  gas  in  approximately   148
communities  within this  area. Viking is  a regulated  natural gas transmission
company that  operates  a  500-mile  interstate natural  gas  pipeline.  NRG  is
primarily   engaged   in  managing   several   of  NSP's   non-regulated  energy
subsidiaries.

    The Company serves customers  in Minnesota, North  Dakota and South  Dakota.
NSP-Wisconsin  serves customers in Wisconsin  and Michigan. Of the approximately
three million people served by the  Company and NSP-Wisconsin, the majority  are
concentrated  in the Minneapolis-St.  Paul Metropolitan Area.  In 1994, about 61
percent of  NSP's  electric  retail  revenue  was  derived  from  sales  in  the
Minneapolis-St. Paul Metropolitan Area and about 56 percent of gas revenues came
from sales in the St. Paul area. NSP's electric generation for 1994 was provided
for  by  coal (59%),  nuclear (36%),  and  renewable and  other fuels  (5%). NSP
currently operates three nuclear units that were placed in service in 1971, 1973
and 1974. NSP has no additional nuclear units under construction.

                                PROPOSED MERGER

    The Company, Wisconsin Energy Corporation, a Wisconsin corporation  ("WEC"),
Northern  Power  Wisconsin  Corp.,  a  Wisconsin  corporation  and  wholly-owned
subsidiary  of  the  Company  ("New  NSP"),  and  WEC  Sub  Corp.,  a  Wisconsin
corporation and wholly-owned subsidiary of WEC ("WEC Sub"), have entered into an
Agreement  and  Plan  of  Merger,  dated  as  of  April  28,  1995  (the "Merger
Agreement"), which provides for a  strategic business combination involving  NSP
and   WEC  in   a  "merger-of-equals"   transaction  (the   "Transaction").  The
Transaction, which was unanimously  approved by the Boards  of Directors of  the
constituent  companies, is expected to close shortly after all of the conditions
to  the  consummation  of   the  Transaction,  including  obtaining   applicable
regulatory  approvals, are  met or  waived. The  regulatory approval  process is
expected to take approximately 12 to 18 months.

    Additional information concerning the Transaction and the Merger  Agreement,
including pro forma combined financial information, is included in the Company's
Quarterly  Report on Form 10-Q  for the quarter ended  March 31, 1995 (the "Form
10-Q") filed  with  the  Commission  and incorporated  by  reference  into  this
Prospectus.

    In  the Transaction, the holding company  of the combined enterprise will be
registered under the Public Utility Holding Company Act of 1935, as amended. The
holding company will be named Primergy Corporation ("Primergy") and will be  the
parent  company  of  both  the  Company  (which,  for  regulatory  reasons, will
reincorporate in Wisconsin) and of  WEC's present principal utility  subsidiary,
Wisconsin  Electric  Power Company  ("WEPCO") which  will be  renamed "Wisconsin
Energy Company." Wisconsin Energy Company  will include the operations of  WEC's
other  present  utility  subsidiary,  Wisconsin Natural  Gas  Company,  which is
anticipated to be merged into WEPCO  by January 1, 1996, as previously  planned.
It  is  anticipated that,  following  the Transaction,  the  Company's Wisconsin
utility subsidiary, NSP-Wisconsin, will be merged into Wisconsin Energy  Company
and  that NRG and  the Company's other subsidiaries  will become subsidiaries of
Primergy.

    As noted above, pursuant to  the Transaction the Company will  reincorporate
in  Wisconsin for regulatory reasons.  This reincorporation will be accomplished
by the merger  of the Company  into New NSP,  with New NSP  being the  surviving
corporation    and   succeeding   to   the    business   of   the   Company   as

                                       3
<PAGE>
an operating public utility. Following such merger, WEC Sub will be merged  with
and  into New NSP, with  New NSP being the  surviving corporation and becoming a
subsidiary of Primergy.  Both New NSP  and WEC  Sub were created  to effect  the
Transaction  and will not have any significant operations, assets or liabilities
prior to such mergers.

    The Transaction  is  subject  to customary  closing  conditions,  including,
without limitation, the receipt of required shareholder approvals of WEC and the
Company  and the receipt of all  necessary governmental approvals and the making
of all necessary governmental filings, all  as more fully described in the  Form
10-Q. Shareholder meetings to vote upon the Transaction will be convened as soon
as  practicable and are  expected to be held  in the third  or fourth quarter of
1995.

    A preliminary estimate  indicates that  the Transaction will  result in  net
savings  of approximately $2.0 billion in costs over 10 years. It is anticipated
that the  synergies  created by  the  Transaction  will allow  the  Company  and
Wisconsin  Energy Company  to implement  a modest  reduction in  electric retail
rates followed by a rate freeze  for electric retail customers through the  year
2000.  Both the Company and WEC recognize that the divestiture of their existing
gas operations and certain non-utility operations is a possibility under the new
registered holding company structure, but will seek approval from the Commission
to  maintain  such  businesses.  If  divestiture  is  ultimately  required,  the
Commission  has  historically allowed  companies  sufficient time  to accomplish
divestitures in a manner that protects shareholder value.

    Following the  completion of  the  Transaction, the  Offered Bonds  and  the
Company's other outstanding first mortgage bonds will be obligations of New NSP,
as a subsidiary of Primergy, and will continue to be secured by the Indenture as
described  in  this Prospectus.  However,  as described  above,  New NSP  is not
expected to retain any of the Company's subsidiaries and the Offered Bonds  will
not  be an obligation of  Primergy or any other  subsidiary of Primergy. For the
twelve months ended March  31, 1995 and  the year ended  December 31, 1994,  the
Company's subsidiaries constituted 30% and 29% of NSP's consolidated net income,
respectively,  and represented 21% of NSP's consolidated assets and 17% of NSP's
consolidated liabilities  including  long-term  debt  at  March  31,  1995.  The
Company's  Current  Report on  Form  8-K dated  June  27, 1995,  filed  with the
Commission and incorporated by reference in this Prospectus, includes pro  forma
financial information for the Company without its subsidiaries.

                                USE OF PROCEEDS

    The  proceeds from the  sale of the New  Bonds will be  added to the general
funds of the Company and used for general corporate purposes, which may  include
the  purchase or redemption of one or  more series of outstanding first mortgage
bonds and  the  repayment  of  outstanding  short-term  borrowings  incurred  in
connection  with NSP's continuing construction program. Short-term borrowings of
the Company aggregated $283 million as of May 31, 1995. The specific  allocation
of the proceeds of a particular series of the Offered Bonds will be described in
the Prospectus Supplement.

                    NSP'S RATIO OF EARNINGS TO FIXED CHARGES

<TABLE>
<CAPTION>
                                                      YEAR ENDED DECEMBER 31,
                                                    ----------------------------
                                                    1994  1993  1992  1991  1990
                                  TWELVE MONTHS     ----  ----  ----  ----  ----
                                      ENDED
                                  MARCH 31, 1995
                                ------------------
                                   (UNAUDITED)
<S>                             <C>                 <C>   <C>   <C>   <C>   <C>
Ratio of Earnings to Fixed
 Charges......................             3.8       4.0   4.0   3.2   3.9   3.7
</TABLE>

    For  purposes  of computing  the  ratio of  earnings  to fixed  charges, (i)
earnings consist of income from  continuing operations before accounting  change
plus  fixed charges, federal  and state income taxes,  deferred income taxes and
investment  tax  credits   and  less   undistributed  equity   in  earnings   of
unconsolidated  investees;  and  (ii)  fixed  charges  consist  of  interest  on
long-term debt, other  interest charges,  the interest component  on leases  and
amortization of debt discount, premium and expense.

                                       4
<PAGE>
    The Company's Current Report on Form 8-K dated June 27, 1995, filed with the
Commission  and incorporated by reference in this Prospectus, contains pro forma
financial information for the Company without its subsidiaries, including a  pro
forma  ratio of earnings to fixed charges  for the twelve months ended March 31,
1995 and for each of the years ended December 31, 1994, 1993 and 1992.

    Assuming that  variable  interest  rate debt  continues  at  interest  rates
applicable  on March 31, 1995, the annual interest requirement on long-term debt
of NSP outstanding at March 31, 1995, was $108,189,000.

                            DESCRIPTION OF NEW BONDS

    Each series of New Bonds is to be an initial issue of a new series of  first
mortgage  bonds (the "Bonds") issued under the Trust Indenture dated February 1,
1937 (the "1937 Indenture") as supplemented by 43 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 such series of New Bonds (the "New Supplemental Indenture"),
all from  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." Excluding the  New Bonds, and giving effect  to
the   expected  redemption   of  $168,000,000  aggregate   principal  amount  of
outstanding Bonds  in August  1995,  there will  be 13  series  of Bonds  in  an
aggregate  principal  amount of  $844,800,000  outstanding under  the Indenture.
Copies  of  the  1937  Indenture,  the  Supplemental  Indentures,  the  Restated
Indenture  and the form of the New  Supplemental Indenture are filed as Exhibits
4.01A to 4.01RR  to the Registration  Statement and the  statements herein  made
(being  for  the  most part  succinct  summaries  of certain  provisions  of the
Indenture) are subject  to the detailed  provisions of the  1937 Indenture,  the
Supplemental  Indentures,  the  Restated  Indenture  and  the  New  Supplemental
Indenture which are incorporated herein by reference.

    The Restated  Indenture  amends and  restates  the 1937  Indenture  and  the
Supplemental  Indentures. The Restated  Indenture will not  become effective and
operative until 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 (except as described below) until the holders  of
the  requisite  principal  amount of  such  Bonds  shall have  consented  to the
amendments contained in the Restated  Indenture (herein, the "Effective  Date").
Holders  of the New Bonds and of each series of Bonds issued under the Indenture
after May 1,  1988 likewise will  be bound  by the amendments  contained in  the
Restated  Indenture when they become effective  and operative. If the consent of
the holders of Bonds of each series issued prior to May 1, 1988 is not  obtained
or  such Bonds are  not retired prior  to their maturity,  the Company presently
expects the Restated Indenture to become  effective no earlier than December  1,
2006.

    The  following summary  of the provisions  of the  Indenture includes, where
applicable, a discussion of the amendments contained in the Restated  Indenture.
References  are  made  to  specific  Article and  Section  numbers  of  the 1937
Indenture, the  Supplemental  Indentures, the  Restated  Indenture and  the  New
Supplemental Indenture. Unless the context indicates otherwise, words or phrases
defined  in  the  1937  Indenture,  the  Supplemental  Indentures,  the Restated
Indenture or the New  Supplemental Indenture are capitalized  and used with  the
same meanings herein.

TERMS OF NEW BONDS

    The  New Bonds will be  issued as fully registered  bonds without coupons in
denominations of multiples of $1,000. New Bonds may be issued in temporary  form
if,  for any reason,  the Company is  unable to deliver  New Bonds in definitive
form. Principal and interest are to  be payable in Chicago, Illinois, at  Harris
Trust  and Savings Bank or in New York,  New York at Harris Trust Company of New
York. New Bonds will be interchangeable in the manner provided in Article II  of
the  New Supplemental Indenture. The New Bonds  may be issued in book-entry form
through the  facilities  of a  depository.  The description  of  any  book-entry
arrangements will be contained in the Prospectus Supplement.

                                       5
<PAGE>
    No  charge will be made  by the Company for any  exchange or transfer of New
Bonds, other than for any taxes or other governmental charges.

    Reference is  made to  the Prospectus  Supplement that  will accompany  this
Prospectus  for the  following terms and  other information with  respect to the
Offered Bonds:  (1)  the designation  and  aggregate principal  amount  of  such
Offered  Bonds; (2) the date  or dates on which  such Offered Bonds will mature;
(3) the rate or rates per annum (or method of calculation) at which such Offered
Bonds will bear interest and the date from which such interest shall accrue; (4)
the dates on  which such  interest will  be payable;  (5) the  record dates  for
payments  of interest;  and (6)  any optional  or mandatory  redemption terms or
other specific  terms  applicable to  the  Offered  Bonds. The  holders  of  the
outstanding  Bonds do not, and  the holders of the New  Bonds will not, have the
right to  tender such  Bonds to  the  Company for  repurchase upon  the  Company
becoming  involved in a  highly leveraged or change  in control transaction. The
Indenture does not have any provision that is designed specifically in  response
to  highly  leveraged or  change in  control transactions.  However, bondholders
would have the security afforded by the first mortgage lien on substantially all
the Company's  property as  described  under the  subcaption "Security  for  New
Bonds"  below. In addition, any change in control transaction and any incurrence
of additional indebtedness (as first mortgage bonds or otherwise) by the Company
in such  a  transaction  would  require approval  of  state  utility  regulatory
authorities and, possibly, of federal utility regulatory authorities. Management
believes  that such  approvals would be  unlikely in any  transaction that would
result in the Company, or a successor to the Company, having a highly  leveraged
capital structure. See "PROPOSED MERGER."

SECURITY FOR NEW BONDS

    In the opinion of counsel for the Company, the New Bonds when issued will be
secured  equally and  ratably, except  as to  sinking fund  provisions, with all
other outstanding Bonds by a valid and direct first mortgage lien on all of  the
real  and fixed properties, leasehold rights,  franchises and permits then owned
by the Company subject only  (a) to Permitted Liens and  (b) as to parts of  the
Company's  property, to 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, to  certain minor defects in titles which are
not material and to defects in titles to certain properties not essential to the
Company's business. The Indenture contains provisions for subjecting to the lien
thereof all  property,  rights and  franchises  (except as  otherwise  expressly
provided)  acquired by the  Company after the  date of the  1937 Indenture. Such
provisions might not be effective as to property acquired, within 90 days  prior
and  subsequent to the filing of a case,  with respect to the Company, under the
United States Bankruptcy Code. The opinion  of counsel does 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.

    The Indenture provides that no prior liens, other than Permitted Liens,  may
be created or permitted to exist upon the mortgaged and pledged property whether
now  owned  or  hereafter acquired.  (Section  4  of Article  VIII  of  the 1937
Indenture.) Following the retirement of the Bonds of each series issued prior to
May 1, 1988, the Restated Indenture will amend the foregoing provisions to allow
Permitted  Encumbrances  on  the  mortgaged  and  pledged  property.   Permitted
Encumbrances  include Permitted Liens and (a)  rights of Persons who are parties
to agreements with the  Company relating to property  owned or used jointly  (in
common)  by the Company with such Persons,  provided (i) that such rights do not
materially impair the use of such jointly  owned or used property in the  normal
operation  of the Company's  business and do not  materially affect the security
afforded by the Indenture  and (ii) that such  rights are not inconsistent  with
the remedies of the Trustee upon a Completed Default; (b) (i) leases existing at
the  Effective Date  of the Restated  Indenture affecting property  owned by the
Company on  the  Effective Date;  (ii)  leases which  do  not interfere  in  any
material  respect with the use of the related property for the purpose for which
it is held by the Company and which  will not have a material adverse impact  on
the  security afforded by  the Indenture or  (iii) other leases  relating to not
more than 5% of the sum of the Company's Depreciable Property and Land; and  (c)
any  mortgage, lien,  charge or encumbrance  prior or  equal to the  Lien of the
Indenture,  other   than   a   Prepaid   Lien,  existing   at   the   date   any

                                       6
<PAGE>
property is acquired by the Company, provided that at the date of acquisition of
such property: (i) no Default has occurred and is continuing; (ii) the principal
amount  of indebtedness  outstanding under and  secured by  such mortgage, lien,
charge or encumbrance shall not exceed 66 2/3% of the lesser of the Cost or Fair
Value of the property so acquired; and (iii) each such mortgage, lien, charge or
encumbrance shall apply only to the property and improvements originally subject
thereto and that the  Company shall cause  to be closed  all mortgages or  other
liens existing at the time of acquisition of any property thereafter acquired by
the  Company and will permit no  additional indebtedness to be issued thereunder
or secured thereby. (Section 1.03 of the Restated Indenture.)

    Following the retirement of the Bonds of each series issued prior to May  1,
1988,  the holders of 66  2/3% of the principal  amount of Bonds Outstanding may
(a) consent to the creation or existence of  a Prior Lien with respect to up  to
50%  of the  sum of  the Company's Depreciable  Property and  Land, after giving
effect to  such Prior  Lien or  (b) terminate  the Lien  of the  Indenture  with
respect  to up to 50% of the sum of the Company's Depreciable Property and Land.
(Section 18.02(e) of the Restated Indenture.)

    The Indenture is not a lien on  the properties of NSP-Wisconsin, nor is  the
stock of NSP-Wisconsin, NRG, Viking or any other subsidiary owned by the Company
pledged thereunder.

SINKING FUND PROVISIONS

    The  sinking fund redemption provision,  if any, for each  series of the New
Bonds will  be set  forth in  the related  Prospectus Supplement.  As an  annual
sinking  fund, the Company covenants to pay  to the Trustee annually, on October
1, an amount sufficient to redeem, for sinking fund purposes, 1% of the  highest
amount, at any time outstanding, of each outstanding series of Bonds, other than
Bonds  of the Series due October 1, 1997, Bonds of the Series due April 1, 2003,
Bonds of the Series due  December 1, 2000, Bonds of  the Series due December  1,
2005,  Bonds of the Series due February 1, 1999, Bonds of the Series due October
1, 2001 and other than Pollution Control Series C, J, K, L and Resource Recovery
Series I.  Sinking  fund  payments may  be  offset  by (a)  application  of  net
Permanent Additions of a Cost or Fair Value, whichever is less, equal to 150% of
the principal amount of Bonds which otherwise would be required to be retired by
the  sinking fund or (b)  retirement or delivery to the  Trustee of Bonds of the
series for which  the sinking  fund is applicable.  The Trustee  is required  to
apply  sinking fund money to  the purchase or redemption  of Bonds of the series
for which such money is applicable. (Article III of each Supplemental  Indenture
except  those dated  June 1, 1942,  February 1,  1944, October 1,  1945, July 1,
1948, August 1, 1949, August 1, 1957,  October 1, 1992, April 1, 1993,  December
1,  1993, October 1, 1994,  and those relating to  each Pollution Control Series
and to Resource Recovery Series I.)

    Certain of  the  Bonds  of Resource  Recovery  Series  I are  subject  to  a
mandatory  sinking fund applicable  to each respective  series. (Section 3.02 of
the Supplemental Indenture dated December 1, 1984.)

MAINTENANCE PROVISIONS

    As a Maintenance Fund  for the Bonds,  the Company covenants  to pay to  the
Trustee  annually on  May 1  an amount  equal to  15% of  the Consolidated Gross
Operating Revenues  of  the  Company  for the  preceding  calendar  year,  after
deducting  from such  revenues: (a)  cost of  electricity and  gas purchased for
resale, (b) rentals  paid for utility  property, less credits  at the  Company's
option  for  (i)  maintenance,  (ii) property  retirements  offset  by Permanent
Additions, (iii) retirements of Bonds and (iv) Cost or Fair Value, whichever  is
less,  of Permanent Additions after  deducting property retirements. Withdrawals
from the Maintenance Fund may be made  on the basis of retirements of Bonds  and
net  Permanent Additions, but cash in excess of $100,000 remaining on deposit in
the Maintenance Fund for more than three years must be used for the purchase  or
redemption  of Bonds.  Any such  redemption would  be at  the applicable regular
redemption price of the Bonds to be redeemed and subject to any restrictions  on
the  redemption of such Bonds. (Article IX  of the 1937 Indenture; Article IV of
the Supplemental Indenture dated June 1, 1952.)

    The Restated Indenture will amend the foregoing provisions of the  Indenture
by  replacing the current Maintenance Fund  deposit formula with the requirement
that the Company pay to the Trustee

                                       7
<PAGE>
annually on May 1 an amount equal to 2.50% of its Completed Depreciable Property
as of the end  of the preceding  calendar year, after  deducting credits at  the
Company's  option  for  (a)  maintenance,  (b)  property  retirements  offset by
Permanent Additions, (c)  retirements of  Bonds and (d)  Amounts of  Established
Permanent  Additions.  (Section 9.01  of the  Restated Indenture.)  The Restated
Indenture further  provides that  to the  extent that  Maintenance Fund  credits
exceed  2.50% of  Completed Depreciable Property  for any year  after 1987, such
excess credits may be applied in future years (a) to offset any Maintenance Fund
deficiency or  (b) to  increase the  Amount of  Established Permanent  Additions
available for use under the Indenture. (Section 9.05 of the Restated Indenture.)
In  addition, the  Restated Indenture  eliminates the  requirement that  cash in
excess of $100,000 remaining  on deposit in the  Maintenance Fund for more  than
three years be used for the purchase or redemption of Bonds.

    The  Company has covenanted  to maintain its  properties in adequate repair,
working order and condition. (Section 6  of Article VIII of the 1937  Indenture;
Section 8.06 of the Restated Indenture.)

ISSUANCE OF ADDITIONAL BONDS

    The maximum principal amount of Bonds that may be issued under the Indenture
is not limited, except as described below. Additional Bonds may be issued on the
basis  of (a)  60% of the  Cost or Fair  Value, whichever is  less, of Permanent
Additions after deducting  retirements (Article  V of the  1937 Indenture;  also
Sections  1 and 3 of Article III of the Supplemental Indenture dated February 1,
1944); (b) retired Bonds, which have not been otherwise used under the Indenture
(Article VI of the 1937 Indenture); and  (c) deposit of an equal amount of  cash
with  the Trustee, which cash  may be withdrawn on  the same basis as additional
Bonds may be issued under  clauses (a) and (b) above.  (Article VII of the  1937
Indenture; Section 2 of Article III of the Supplemental Indenture dated February
1,  1944; and Article IV of the  Supplemental Indenture dated June 1, 1952.) The
Restated Indenture  will amend  the  foregoing provisions  of the  Indenture  by
increasing the percentage in clause (a) above from 60% to 66 2/3%. (Section 5.03
of the Restated Indenture.)

    The New Bonds will be issued under clause (a) and/or (b) above. At March 31,
1995,  the amount of net Permanent Additions available for the issuance of Bonds
exceeded  $4.1  billion,  of   which  $417  million  could   be  used  for   the
authentication  of $250 million principal  amount of the New  Bonds. As of March
31, 1995, $159 million of retired Bonds were available for the authentication of
up to $159 million of New Bonds.

    No additional Bonds may  be issued on  the basis of  clause (a), clause  (b)
under  specified conditions,  or clause (c),  unless the  Earnings Applicable to
Bond Interest for a specified twelve-month period are equal to twice the  annual
interest requirements on the Bonds, including those about to be issued. (Section
4  of Article V, Section  2 of Article VI,  and Section 1 of  Article VII of the
1937 Indenture.)

    Permanent Additions include:  the Company's electric  and steam  generating,
transmission   and  distribution  properties;  the  Company's  gas  storage  and
distribution  properties;  construction  work-in-progress;  and  fractional  and
undivided property interests of the Company. (Section 4 of Article I of the 1937
Indenture;   Section  1.03  of  the  Restated  Indenture.)  Under  the  Restated
Indenture, Permanent Additions  also will  include property  used for  providing
telephone  or other communication services and engineering, financial, economic,
environmental, geological  and  legal  or  other  studies,  surveys  or  reports
associated  with the  acquisition or  construction of  any Depreciable Property.
(Section 1.03 of the Restated Indenture.)

    Assuming that the  interest cost on  variable rate Bonds  is at the  maximum
allowable rate, Earnings Applicable to Bond Interest for the twelve months ended
March 31, 1995, would be 5.0 times the annual interest requirements on the Bonds
including  the New Bonds. Additional Bonds may vary from the Offered Bonds as to
maturity, interest rate,  redemption prices,  and sinking fund,  and in  certain
other respects. (Article II of the 1937 Indenture and Article II of the Restated
Indenture.)  The Restated Indenture  will amend the  Indenture by requiring that
Earnings Applicable  to Bond  Interest for  a specified  twelve-month period  be
equal  to twice the  annual interest requirements on  the Bonds, including those
about to  be  issued,  and  any  obligations secured  by  Prior  Liens  and  any
indebtedness secured by Permitted

                                       8
<PAGE>
Encumbrances.  (Sections 1.03  and 5.04  of the  Restated Indenture.)  Under the
Restated Indenture, the calculation of Earnings Applicable to Bond Interest will
include all non-utility revenues of the  Company. (Section 1.03 of the  Restated
Indenture.)

PROVISION LIMITING DIVIDENDS ON COMMON STOCK

    The   Company  has  covenanted  that  the  sum  of  (i)  all  dividends  and
distributions on the common stock of the Company after September 30, 1954 (other
than in common  stock), and  (ii) the  cost of all  shares of  its common  stock
acquired  by it  after that  date shall  not exceed  the sum  of (a)  the earned
surplus of the Company and its Qualified Subsidiary Companies, consolidated,  at
September  30, 1954, and (b)  an amount equal to  the consolidated net income of
the Company and its Qualified  Subsidiary Companies, earned after September  30,
1954,  after  making provision  for all  dividends accruing  after that  date on
preferred stock of the  Company and after taking  into consideration all  proper
charges  and credits to  earned surplus made  after that date.  In computing net
income for the purpose of  this covenant, there will  be deducted an amount,  if
any,  by  which  15%  of  the  Consolidated  Gross  Operating  Revenues  of such
companies, after  certain  deductions,  exceeds the  aggregate  of  the  amounts
expended   for  maintenance   and  appropriated   for  reserves   for  renewals,
replacements,  retirements,  depreciation  or  depletion.  (Article  IV  of  the
Supplemental Indenture dated October 1, 1954.) As of 1957, the Company no longer
had  any Qualified  Subsidiary Companies.  This provision  has not  impaired the
Company's ability to pay dividends in the past  and is not expected to do so  in
the future.

    The Restated Indenture will replace the dividend restriction described above
with the requirement that (a) the sum of: (i) all dividends and distributions on
the  Company's common stock  after the Effective Date  of the Restated Indenture
(other than  in  common  stock) and  (ii)  the  amount, if  any,  by  which  the
Considerations given by the Company for the purchase or other acquisition of its
common  stock after the Effective Date exceeds the Considerations received by it
after the Effective Date from the sale of common stock, shall not exceed (b) the
sum of (i) the retained earnings of the Company at the Effective Date, and  (ii)
an  amount equal  to the net  income of  the Company earned  after the Effective
Date, after deducting  all dividends accruing  after the Effective  Date on  all
classes  and series  of preferred  stock of  the Company  and after  taking into
consideration all proper charges  and credits to earned  surplus made after  the
Effective  Date.  In  computing  net  income for  the  purpose  of  this amended
covenant, there will be deducted  the amount, if any,  by which, after the  date
commencing  365 days  prior to  the Effective  Date, the  actual expenditures or
charges for  ordinary repairs  and  maintenance and  the charges  for  reserves,
renewals,  replacements, retirements,  depreciation and depletion  are less than
2.50% of  the Company's  Completed Depreciable  Property. (Section  8.07 of  the
Restated Indenture.)

RELEASE PROVISIONS

    The  Indenture contains provisions  permitting the release  from its lien of
any property  upon depositing  or pledging  cash or  certain other  property  of
comparable  Fair Value. The  Indenture also contains provisions  for the sale or
other disposal  of  securities  not  pledged  under  the  Indenture,  contracts,
accounts,  motor cars, and certain equipment and supplies; for the cancellation,
change or  alteration  of  leases,  rights-of-way and  easements;  and  for  the
surrender  and modification of any franchise  or governmental consent subject to
certain restrictions; in each case without any release or consent by the Trustee
or accountability  thereto  for  any  consideration  received  by  the  Company.
(Article XI of the 1937 Indenture and Article XI of the Restated Indenture.)

    Following  the retirement of the Bonds of each series issued prior to May 1,
1988, (a) the Company may sell or otherwise dispose of, free of the Lien of  the
Indenture,  all  motor vehicles,  vessels and  marine equipment,  railroad cars,
engines  and  related  equipment,  airplanes,  office  furniture  and  leasehold
interests  in property owned by third parties and (b) the Company may enter into
leases with respect to the property subject  to the Lien of the Indenture  which
do  not interfere in any material respect with  the use of such property for the
purpose for which it is held by the Company and will not have a material adverse
impact on  the security  afforded by  the Indenture.  (Section 11.02(b)  of  the
Restated Indenture.)

    Following  the retirement of the Bonds of each series issued prior to May 1,
1988, any of the mortgaged and pledged property may be released from the Lien of
the Indenture if, after such release,

                                       9
<PAGE>
the Fair Value of the remaining mortgaged and pledged property equals or exceeds
a sum equal  to 150%  of the aggregate  principal amount  of Bonds  Outstanding.
(Section   11.03(k)  of  the  Restated   Indenture.)  When  effective  and  upon
satisfaction of  the requirements  set forth  in the  Indenture, this  provision
would  permit  the Company  to spin-off  or otherwise  dispose of  a substantial
amount of assets or a line of business without depositing cash or property  with
the Trustee or obtaining the consent of the bondholders.

MODIFICATION OF THE INDENTURE

    With  the consent  of the  Company, the provisions  of the  Indenture may be
changed by the affirmative vote of the holders of 80% in principal amount of the
Bonds Outstanding except that,  among other things, the  maturity of a Bond  may
not  be  extended,  the interest  rate  reduced,  nor the  terms  of  payment of
principal or interest changed without the consent of the holder of each Bond  so
affected. (Article XVIII of the 1937 Indenture.)

    The   Supplemental  Indenture  dated  May  1,  1985  amended  the  foregoing
provisions of the  Indenture by reducing  the 80% requirement  to 66 2/3%.  This
amendment will not become effective and operative until all Bonds of each series
issued  prior to May  1, 1985 shall have  been retired or  until all the holders
thereof shall have consented to such amendment. Holders of the New Bonds and  of
each  subsequent series issued under the Indenture will likewise be bound by the
amendment  when  it  becomes  effective  and  operative.  (Article  VI  of   the
Supplemental  Indenture  dated May  1, 1985  and Section  18.02 of  the Restated
Indenture.)

CONCERNING THE TRUSTEE

    In case of a Completed Default either  the Trustee or the holders of 25%  in
principal amount of (i) the Bonds Outstanding or (ii) the Bonds affected by such
default,  may declare  the Bonds  due and  payable subject  to the  right of the
holders of a majority  of the Bonds  then Outstanding to  rescind or annul  such
action.  Further, it is obligatory upon the Trustee to take the actions provided
in the Indenture to enforce payment of  the Bonds and the Lien of the  Indenture
upon  being requested to do so by the  holders of a majority in principal amount
of the Bonds.  However, the holders  of a  majority in principal  amount of  the
Bonds may direct the taking of any such action or the refraining therefrom as is
not  contrary  to law  or the  Indenture.  As a  condition precedent  to certain
actions, the Trustee may require adequate indemnity against the costs,  expenses
and  liabilities to be  incurred therein or  thereby. (Article XIII  of the 1937
Indenture; Section 6 of Article VI  of Supplemental Indenture dated February  1,
1944;  Section 4.03 of Supplemental Indenture  dated October 1, 1945 and Article
XIII of the Restated Indenture.)

DEFAULTS

    The following is a summary of  events defined in the Indenture as  Completed
Defaults: (a) default in payment of principal of any Bond, (b) default continued
for  90 days  in payment of  interest on any  Bond, (c) default  in the covenant
contained in Section 11 of  Article VIII of the  Indenture (Section 8.11 of  the
Restated  Indenture)  with  respect  to  bankruptcy,  insolvency,  assignment or
receivership and  (d)  default  continued  for  90  days  after  notice  in  the
performance  of any other covenant, agreement or condition. (Section 4.02 of the
Supplemental Indenture dated October 1, 1945  and Section 13.01 of the  Restated
Indenture.)

    The  Trustee is required  to give notice  to bondholders (1)  within 90 days
after the occurrence of a  default known to the  Trustee within such period,  or
(2)  if the Trustee is unaware of a  default during such period, then, within 30
days after the  Trustee knows of  such default, unless  such default shall  have
been  cured before giving  such notice; provided  that, except in  the case of a
default resulting  from the  failure to  make  any payment  of principal  of  or
interest  on any  Bonds or  to make  any sinking  fund payment,  the Trustee may
withhold such notice upon determination in good faith by the board of directors,
the executive  committee  or  a  trust committee  of  directors  or  responsible
officers  of the Trustee that the withholding  of such notice is in the interest
of the bondholders. (Section 4 of Article V of the Supplemental Indenture  dated
February 1, 1944 and Section 16.02 of the Restated Indenture.)

                                       10
<PAGE>
    The Company is required to file with the Trustee such information, documents
and  reports with respect to  compliance by the Company  with the conditions and
covenants of the Indenture as  may be required by  the rules and regulations  of
the  Commission  including a  certificate,  furnished not  less  frequently than
annually, as  to  the  Company's  compliance with  all  of  the  conditions  and
covenants  under the  Indenture. (Section 8  of Article III  of the Supplemental
Indenture dated February 1, 1944 and Section 8.18 of the Restated Indenture.)

GENERAL

    Whenever all indebtedness secured thereby shall have been paid, or  adequate
provision  therefor made, the Trustee shall  cancel and discharge the Indenture.
(Article XVII of the 1937 Indenture and Article XVII of the Restated Indenture.)
After the  Effective  Date,  the  Company  may  deposit  with  the  Trustee  any
combination  of  cash or  Government  Obligations in  order  to provide  for the
payment of  any series  or all  of  the Bonds  Outstanding. The  Indenture  also
provides that the Company shall furnish, to the Trustee, Officers' Certificates,
certificates  of an Engineer,  Appraiser or other expert  and, in certain cases,
Accountants' Certificates in  connection with the  authentication of Bonds,  the
release  or release and substitution of  property and certain other matters, and
Opinions of Counsel as to the Lien  of the Indenture and certain other  matters.
(Article  IV of the Supplemental Indenture  dated February 1, 1944; Articles IV,
V, VI, VII, XI and XVII and Section 20.08 of the Restated Indenture.)

                                 LEGAL OPINIONS

    Legal opinions  relating  to the  New  Bonds will  be  rendered by  Gary  R.
Johnson, 414 Nicollet Mall, Minneapolis, Minnesota, counsel for the Company, and
by Gardner, Carton & Douglas, 321 North Clark Street, Chicago, Illinois, counsel
for  any underwriters, dealers or agents  named in a Prospectus Supplement. Gary
R. Johnson is  Vice President,  General Counsel  and Secretary  of the  Company.
Matters  pertaining to local laws will be passed upon by counsel for the Company
and as to these matters Gardner, Carton  & Douglas will rely on their  opinions.
The   opinion   contained  in   this  Prospectus   under  "Description   of  New
Bonds--Security for New  Bonds," is  the opinion  of Gary  R. Johnson.  Gardner,
Carton  & Douglas  has acted  from time to  time as  special counsel  for NSP in
connection with certain matters, including the Transaction.

                                    EXPERTS

    The financial  statements  and  the related  financial  statement  schedules
incorporated in this Prospectus by reference from the Company's Annual Report on
Form  10-K  (which  reports  express  an  unqualified  opinion  and  include  an
explanatory paragraph referring to the Company's change in method of  accounting
for  postretirement healthcare  costs in 1993)  have been audited  by Deloitte &
Touche LLP, independent public accountants,  as stated in their report  included
in  such Form 10-K which  is incorporated herein by  reference, and have been so
incorporated in reliance upon such report given upon the authority of that  firm
as experts in accounting and auditing.

                              PLAN OF DISTRIBUTION

    The  Company  may sell  the  New Bonds  (i)  to or  through  underwriters or
dealers; (ii) directly to one or  more purchasers; or (iii) through agents.  The
Prospectus  Supplement with  respect to  each series  of Offered  Bonds will set
forth the terms of  the offering of  such Offered Bonds,  including the name  or
names  of any  underwriters, the  purchase price of  such Offered  Bonds and the
proceeds to the  Company from such  sale, any underwriting  discounts and  other
items  constituting  underwriters'  compensation,  any  initial  public offering
price, any discounts or concessions allowed or reallowed or paid to dealers  and
any  securities exchanges on which such Offered Bonds may be listed. Any initial
offering  price  and  any  discounts,  concessions  or  commissions  allowed  or
reallowed or paid to dealers may be changed from time to time.

    If  underwriters are used in the sale, the Offered Bonds will be acquired by
the underwriters for their own  account and may be resold  from time to time  in
one or more transactions, including negotiated

                                       11
<PAGE>
transactions,  at a fixed public offering  price or at varying prices determined
at the time  of sale.  The Offered  Bonds may be  offered to  the public  either
through underwriting syndicates represented by one or more managing underwriters
or  directly by one or more of  such firms. The specific managing underwriter or
underwriters, if any, will be set forth in the Prospectus Supplement relating to
the Offered Bonds together  with the members of  the underwriting syndicate,  if
any. Unless otherwise set forth in the Prospectus Supplement, the obligations of
the  underwriters to purchase the Offered  Bonds offered thereby will be subject
to certain  conditions  precedent and  the  underwriters will  be  obligated  to
purchase all such Offered Bonds if any are purchased.

    Offered  Bonds  may  be  sold  directly by  the  Company  or  through agents
designated by the Company from time to time. The Prospectus Supplement will  set
forth  the name of any agent involved in  the offer or sale of the Offered Bonds
in respect of which the Prospectus  Supplement is delivered and any  commissions
payable by the Company to such agent.

    Any underwriters, dealers or agents participating in the distribution of the
Offered  Bonds may be deemed to be underwriters and any discounts or commissions
received by them on the sale or resale of the Offered Bonds may be deemed to  be
underwriting  discounts and commissions under the Securities Act of 1933. Agents
and underwriters  may  be  entitled,  under agreements  entered  into  with  the
Company,  to indemnification by  the Company against  certain civil liabilities,
including liabilities under the Securities Act of 1933, or to contributions with
respect to payments which the agents or underwriters may be required to make  in
respect  thereof. Agents  and underwriters  may engage  in transactions  with or
perform services for the Company in the ordinary course of business.

                                       12
<PAGE>
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<PAGE>
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    NO  PERSON  HAS BEEN  AUTHORIZED  TO GIVE  ANY  INFORMATION OR  TO  MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS SUPPLEMENT OR  THE
PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON  AS HAVING BEEN  AUTHORIZED. THIS PROSPECTUS  SUPPLEMENT AND  THE
PROSPECTUS DO NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO
BUY  ANY  SECURITIES  OTHER THAN  THE  SECURITIES DESCRIBED  IN  THIS PROSPECTUS
SUPPLEMENT OR AN  OFFER TO  SELL OR  THE SOLICITATION OF  AN OFFER  TO BUY  SUCH
SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR SOLICITATION IS UNLAWFUL.
NEITHER  THE DELIVERY  OF THIS PROSPECTUS  SUPPLEMENT OR THE  PROSPECTUS NOR ANY
SALE MADE HEREUNDER  OR THEREUNDER  SHALL, UNDER ANY  CIRCUMSTANCES, CREATE  ANY
IMPLICATION  THAT THE INFORMATION  CONTAINED HEREIN OR THEREIN  IS CORRECT AS OF
ANY TIME SUBSEQUENT TO THE DATE OF SUCH INFORMATION.

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

                               TABLE OF CONTENTS

                             PROSPECTUS SUPPLEMENT

<TABLE>
<CAPTION>
                                                   PAGE
                                                 ---------
<S>                                              <C>
Use of Proceeds................................        S-2
Supplemental Description of Offered Bonds......        S-2
Underwriting...................................        S-5
                        PROSPECTUS
Available Information..........................          2
Documents Incorporated by Reference............          2
NSP............................................          3
Proposed Merger................................          3
Use of Proceeds................................          4
NSP's Ratio of Earnings to Fixed Charges.......          4
Description of New Bonds.......................          5
Legal Opinions.................................         11
Experts........................................         11
Plan of Distribution...........................         11
</TABLE>

                                  $250,000,000

                             NORTHERN STATES POWER
                                    COMPANY
                           (A MINNESOTA CORPORATION)

                          7 1/8% FIRST MORTGAGE BONDS
                            SERIES DUE JULY 1, 2025

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

                             PROSPECTUS SUPPLEMENT
                               -----------------

                            PAINEWEBBER INCORPORATED

                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION

                                LEHMAN BROTHERS

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

                                 JUNE 28, 1995

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