NORTHERN STATES POWER CO /MN/
424B2, 1994-02-11
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED JANUARY 14, 1994)

                                  $200,000,000
                         NORTHERN STATES POWER COMPANY
                           (A MINNESOTA CORPORATION)

            5 1/2% FIRST MORTGAGE BONDS, SERIES DUE FEBRUARY 1, 1999
                                 -------------

                    INTEREST PAYABLE FEBRUARY 1 AND AUGUST 1
                                 --------------

INTEREST  ON THE 5 1/2%  FIRST MORTGAGE BONDS, SERIES  DUE FEBRUARY 1, 1999 (THE
"OFFERED BONDS")  IS PAYABLE  ON FEBRUARY  1 AND  AUGUST 1  OF EACH  YEAR,
      COMMENCING   AUGUST  1,  1994.  THE  OFFERED  BONDS  ARE  NOT
             REDEEMABLE PRIOR TO MATURITY. SEE
                    "SUPPLEMEN           TAL 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 DEPOSITARY ("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 IT PARTICPANTS. 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.
                                 --------------

                       PRICE 99.825% AND ACCRUED INTEREST
                                 --------------

<TABLE>
<CAPTION>
                                                   UNDERWRITING
                                    PRICE TO       DISCOUNTS AND     PROCEEDS TO
                                   PUBLIC (1)     COMMISSIONS (2)   COMPANY (1)(3)
                                ----------------  ---------------  ----------------
<S>                             <C>               <C>              <C>
PER BOND......................      99.825%           .1620%           99.663%
TOTAL.........................    $199,650,000       $324,000        $199,326,000
<FN>
- ---------
(1) PLUS ACCRUED INTEREST FROM FEBRUARY 1, 1994.
(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 $421,000 PAYABLE BY THE COMPANY.
</TABLE>

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

    THE OFFERED  BONDS ARE  OFFERED, SUBJECT  TO  PRIOR SALE,  WHEN, AS  AND  IF
ACCEPTED BY THE UNDERWRITERS AND SUBJECT TO APPROVAL OF CERTAIN LEGAL MATTERS BY
GARDNER,  CARTON &  DOUGLAS, COUNSEL FOR  THE UNDERWRITERS. IT  IS EXPECTED THAT
DELIVERY OF THE OFFERED BONDS WILL BE MADE ON OR ABOUT FEBRUARY 17, 1994 THROUGH
THE BOOK-ENTRY  FACILITIES  OF THE  DEPOSITORY  TRUST COMPANY,  AGAINST  PAYMENT
THEREFOR IN NEW YORK FUNDS.
                                 --------------

MORGAN STANLEY & CO.
       INCORPORATED
                           SMITH BARNEY SHEARSON INC.
                                                              PIPER JAFFRAY INC.

FEBRUARY 10, 1994
<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.

    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.
                                 --------------

                                USE OF PROCEEDS

    The net proceeds from the sale of $200,000,000 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) $30,000,000  in principal amount of its 6 1/8%
First Mortgage Bonds, Series due June 1, 1995, at a redemption price of  100.29%
of the principal amount thereof plus accrued interest to the date of redemption,
(ii)  $45,000,000 in principal amount of its 5 7/8% First Mortgage Bonds, Series
due August 1, 1996,  at a redemption  price of 100.51%  of the principal  amount
thereof  plus accrued interest  to the date of  redemption, (iii) $30,000,000 in
principal amount of its 6 1/2% First Mortgage Bonds, Series due October 1, 1997,
at a redemption price  of 100.75% of the  principal amount thereof plus  accrued
interest  to the date of redemption and  (iv) $45,000,000 in principal amount of
its 6 3/4% First Mortgage Bonds, Series  due May 1, 1998, at a redemption  price
of  100.93% of the principal amount thereof plus accrued interest to the date of
redemption. The balance  of the net  proceeds will be  used to repay  short-term
borrowings.  Short-term borrowings of the Company  aggregated $192 million as of
January 31, 1994.

                       CONSTRUCTION PROGRAM AND FINANCING

    Total Northern States  Power Company (NSP)  capital expenditures  (including
allowance   for   funds  used   during   construction  and   excluding  business
acquisitions) totaled $362 million in 1993. Internally generated funds  provided
98.5%  of the capital expenditures for  1993. These capital expenditures include
gross additions to  utility property  of $357  million. In  addition to  capital
expenditures,  NSP invested $159 million in 1993 to acquire three energy-related
businesses: Minneapolis  Energy  Center,  Viking Gas  Transmission  Company  and
certain assets of Centran Corporation.

    NSP's  utility  capital  expenditures (including  allowance  for  funds used
during construction) are  currently estimated to  be $396 million  for 1994  and
$1.8  billion for the five years ended December 31, 1998. Also included in NSP's
projected capital expenditures is  $60 million in 1994  and $280 million  during
the five years ended December 31, 1998 for nuclear fuel for NSP's three existing
nuclear  units. The  remaining capital  expenditures through  1998 are  for many
utility projects, none of which are extraordinarily large relative to the  total
capital  expenditure  program. Approximately  80%  of the  1994  utility capital
expenditures and approximately 95% of the 1994-1998 utility capital expenditures
are expected  to  be  provided  by internally  generated  funds.  The  foregoing
estimates  of utility capital expenditures and internally generated funds may be
subject to  substantial  changes due  to  unforeseen factors,  such  as  changed
economic  conditions, competitive conditions,  resource planning, new government
regulations, changed tax laws and rate regulation.

                                      S-2
<PAGE>
    Although they  may  vary depending  on  the  success, timing  and  level  of
involvement   in  projects  currently  under  consideration,  potential  capital
requirements for NSP's non-regulated  projects (including equity investments  in
joint  ventures) are estimated to  be $130 million in  1994 and $540 million for
the five-year period 1994-1998. These non-regulated projects are expected to  be
financed  primarily through project  debt. The remaining  project costs would be
funded through equity investments from NSP. Such equity investments are expected
to be  financed on  a  long-term basis  through  internally generated  funds  or
through NSP's issuance of common stock and debt.

                              RECENT DEVELOPMENTS

1993 FINANCIAL RESULTS

    NSP's  1993  earnings  per  share  from  continuing  operations  were $3.02,
compared with  $2.31  in 1992  before  an  accounting change.  The  increase  in
earnings  was due primarily to  more normal weather and  rate increases in 1993.
Total earnings per  share of $3.04  in 1992  include a one-time  increase of  73
cents per share due to an accounting change that recognizes the accrual of prior
year's  unbilled  revenues.  The  Company's Current  Report  on  Form  8-K dated
February 9,  1994  contains  NSP's unaudited  Statements  of  Income,  unaudited
Consolidated  Statements of Cash  Flows and unaudited  Consolidated Statement of
Changes in Common Stockholders'  Equity for the three  years ended December  31,
1993,  and its unaudited  Consolidated Balance Sheet  and unaudited Consolidated
Statements of  Capitalization,  as  of  December 31,  1993  and  1992,  and  are
incorporated herein by reference.

    The  following summary financial information is qualified in its entirety by
the detailed information  and financial  statements included  elsewhere in  this
Prospectus,  including the  information contained in  the documents incorporated
herein by reference.

                  SELECTED CONSOLIDATED FINANCIAL INFORMATION
              (THOUSANDS OF DOLLARS, EXCEPT FOR PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                          YEAR ENDED DECEMBER 31,
                                                             -------------------------------------------------
                                                                   1991              1992            1993
                                                             ----------------  ----------------  -------------
                                                               (FROM AUDITED AMOUNTS IN FORM      (UNAUDITED)
                                                                           10-K)
<S>                                                          <C>               <C>               <C>
INCOME STATEMENT:
  Electric Revenues........................................  $   1,863,238     $   1,823,316     $   1,974,916
  Gas Revenues.............................................        337,920           336,206           429,076
  Income from Continuing Operations before Accounting
   Change..................................................        207,012(1)        160,928(2)        211,740
  Net Income...............................................        224,047(3)        206,440(3)        211,740
  Earnings Available for Common Stock......................        206,053           190,268           197,160
  Earnings per Average Common Share:
    Continuing Operations before Accounting Change.........           $3.02            $2.31(2)          $3.02
      Total................................................           $3.29  (3)          $3.04  (3)         $3.02
</TABLE>

<TABLE>
<CAPTION>
                                                                             DECEMBER 31, 1993
                                                          -------------------------------------------------------
                                                                                (UNAUDITED)
                                                                                              PERCENT OF ADJUSTED
                                                               ACTUAL       AS ADJUSTED (4)     CAPITALIZATION
                                                          ----------------  ----------------  -------------------
<S>                                                       <C>               <C>               <C>
CAPITALIZATION:
  Long-term Debt, due after one year....................  $   1,291,867(5)  $   1,341,867(5)          39.35 %
  Cumulative Preferred Stock (including premium)........        240,469           240,469              7.05 %
  Common Stockholders' Equity (including premium).......      1,827,454         1,827,454             53.60 %
                                                          ----------------  ----------------     -------
    Total...............................................  $   3,359,790     $   3,409,790            100.00 %
                                                          ----------------  ----------------     -------
                                                          ----------------  ----------------     -------
<FN>
- ---------
(1) Excludes income (net of tax) from discontinued telephone operations of  $0.2
    million in 1991.
(2) Includes  the  1992  current-year impact  of  the change  in  accounting for
    unbilled revenues, which increased income by $9.8 million ($0.16 per share).
</TABLE>

                                      S-3
<PAGE>
(CONTINUATION OF FOOTNOTES FROM PRIOR PAGE)

<TABLE>
<S> <C>
(3) Includes, net  of tax,  income  from discountinued  operations and  gain  on
    disposal  of telephone operations of $17.0 million ($0.27 per share) in 1991
    and, net of tax, cumulative effect of unbilled revenue accounting change  of
    $45.5 million ($0.73 per share) in 1992.
(4) Adjusted  to give effect to the refunding  of $150 million in long-term debt
    and the issuance of $200 million in long-term debt.
(5) Excludes $90.6  million of  current  portion of  long-term debt  and  $141.6
    million  of pollution  control revenue  bonds that  are subject  to optional
    tender for purchase upon seven days notice by any bondholder.
</TABLE>

RATE MATTERS

    The Company received final rate  orders from the Minnesota Public  Utilities
Commission  (MPUC) in December  1993 and January 1994  allowing an annual retail
electric rate increase  of $72.2 million  (5.4%) and an  annual retail gas  rate
increase of $10.0 million (3.9%). The return on equity granted in both cases was
11.47%.  Electric rate  refunds of interim  rates collected are  required in the
amount of $12.6 million and are expected to  be paid in May 1994. No refunds  of
interim  gas rates collected are required. Final  rates for gas and electric are
expected to be implemented in March and April 1994, respectively. The effects of
the final orders  were recorded  in fourth  quarter 1993.  However, the  Company
restated  its third quarter 1993  earnings for the effects  of the final orders,
reporting earnings per share of $0.96 and $2.27, versus the previously  reported
earnings  per share of  $0.84 and $2.15  for three months  and nine months ended
September 30, 1993, respectively.

    On January 31, 1994, an appeal of the MPUC's determination on allowed return
on equity  was  filed with  the  Minnesota Court  of  Appeals by  the  Minnesota
Department  of Public Service, the Office  of Attorney General and the Minnesota
Energy  Consumers  intervenor  groups.  The   appeal  concerns  the  method   of
calculation  of the  rate of return  for both  the electric and  gas cases. This
issue could impact approximately $7 million in annual revenues for the  Company.
The  ultimate financial impact  of this appeal,  if any, is  not determinable at
this time. A decision by the court is expected by year end 1994.

UNION NEGOTIATIONS

    NSP's labor agreements with  its five local unions  expired on December  31,
1993. An interim agreement with the unions expires March 31, 1994. The Company's
final  offer  for  settlement  is  currently  being  presented  to  NSP's  union
employees. Results of  the employees'  vote is expected  on or  about March  14,
1994.  The Company is  not able to  predict the outcome  of negotiations at this
time.

BUSINESS ACQUISITIONS

    On March 4, 1993, NRG signed a letter of intent to join with Comalco Limited
of Australia (Comalco) and other parties to acquire the Gladstone Power  Station
from Queensland Electricity Commission (QEC). Gladstone is a 1,680 Mw coal-fired
plant  located  in  Gladstone, Queensland,  Australia.  A large  portion  of the
generated electricity would  be sold to  Boyne Smelters Limited  for use in  its
aluminum smelter, with the remainder being sold to QEC, in each case pursuant to
long-term  power  purchase  agreements.  NRG  expects  to  acquire  37.5 percent
interest in the Gladstone  plant for approximately  $60 million. A  wholly-owned
subsidiary  of NRG is  expected to operate  the Gladstone plant.  Closing of the
acquisition is expected in the first half of 1994.

PRAIRIE ISLAND NUCLEAR STORAGE FACILITY

    As previously disclosed, the  Company is experiencing uncertainty  regarding
its  ability  to  store  used  nuclear  fuel  from  its  Prairie  Island nuclear
generating facility. The  Company's Prairie Island  nuclear generating  facility
stores its used nuclear fuel on an interim basis in a storage pool in the plant,
pending  the availability of a  U.S. Department of Energy high-level-radioactive
waste storage  or permanent  disposal  facility, or  a private  interim  storage
facility. At current operating levels, the pool will be full in 1994, so NSP has
proposed  to augment  Prairie Island's interim  storage capacity  by using steel
containers for  dry storage  of used  nuclear fuel  on the  plant site.  Without
additional on-site storage, operations at

                                      S-4
<PAGE>
Prairie  Island, which supplies  about 20 percent of  the Company's output, will
begin to be curtailed in  mid-1995 and the plant  will cease operating by  early
1996.  The Company has obtained a Certificate of Need from the MPUC allowing use
of a limited  number of steel  containers, providing adequate  storage at  least
through  the  year 2001.  The Nuclear  Regulatory Commission  has also  issued a
license approving a dry storage facility on the plant site for Prairie  Island's
used  fuel. However, in June  1993, the Minnesota Court  of Appeals decided that
the additional temporary storage  facilities must be  approved by the  Minnesota
Legislature.  The Company has  requested such approval  from the Legislature and
expects a decision  on this issue  during the current  session, which begins  on
February 22, 1994. Although hearings have begun, the Company cannot predict what
action the Minnesota Legislature will take.

    NSP's  net investment in the Prairie  Island generating facility at December
31, 1993, was  $520 million.  Future plant  decommissioning costs  in excess  of
amounts  not accrued and  collected in rates  were $247 million  at December 31,
1993. Should the facility need  to be shut down due  to the full utilization  of
spent  fuel storage capacity, the Company would request recovery of and a return
on its investment  and unrecorded decommissioning  costs through utility  rates.
However,  at this time, the  regulators' ultimate response to  such a request is
unknown. Without the generating capability  of the Prairie Island facility,  the
Company  estimates that  additional purchased  power expenses  of at  least $200
million per  year  could  be  incurred. To  the  extent  such  additional  costs
represent  energy purchases,  current rate  treatment provides  recovery through
cost-of-energy adjustments to customer rates. The Company will request  recovery
of  costs associated  with additional capacity  purchases or  investments in new
plants through general  rate filings. However,  at this time  the need for  such
costs  and  regulators' ultimate  response  to such  a  request is  unknown. The
Company estimates that the  present value of the  cost of supplying  replacement
power   and   recovering  its   investment   in  the   plant   and  unrecognized
decommissioning costs will be $1.8 billion. Due to the adverse consequences of a
plant shutdown, the Company will pursue all legal and legislative actions which,
at its discretion, may be applicable.

                    NSP'S RATIO OF EARNINGS TO FIXED CHARGES

<TABLE>
<CAPTION>
                                                        YEAR ENDED DECEMBER 31,
                                                ---------------------------------------
                                                   1993       1992   1991   1990   1989
                                                -----------   ----   ----   ----   ----
                                                (UNAUDITED)
<S>                                             <C>           <C>    <C>    <C>    <C>
Ratio of Earnings to Fixed Charges...........         4.0      3.2    3.9    3.7    4.1
</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 (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.

    Assuming  variable interest rate debt continues  at year-end 1993 rates, the
annual interest requirement on long-term debt of NSP outstanding at December 31,
1993 was $95,144,989.

                   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 February 1,  1994, 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.

                                      S-5
<PAGE>
GENERAL

    Interest on the Offered Bonds at the annual rate set forth on the cover page
of this Prospectus Supplement will  accrue from February 1,  1994, and is to  be
payable  semi-annually on  February 1  and August  1, beginning  August 1, 1994.
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  January 21 prior  to
February  1 and the July  21 prior to August  1 unless any Record  Date is not a
Business Day, in which event the Record Date will be the next preceding Business
Day).

    Excluding the Offered Bonds,  17 series of Bonds  in an aggregate  principal
amount  of  $844,900,000  currently  are  outstanding  under  the  Indenture. At
December 31, 1993 the amount of  net Permanent Additions available for  issuance
of Bonds exceeded $3.7 billion. As of December 31, 1993, $255 million of retired
Bonds were available for the authentication of Bonds, of which $200 million will
be  used for the authentication of the Offered Bonds. Assuming the interest cost
on variable rate bonds is at the maximum allowable rate, earnings applicable  to
bond  interest for the twelve months ended December 31, 1993, would be 6.4 times
the annual interest requirements of the Bonds, including the Offered Bonds.

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

    DTC  will act  as securities depository  for the Offered  Bonds. The Offered
Bonds will be registered in the name of Cede & Co. (DTC's partnership  nominee).
Two  fully-registered Offered Bond 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  Offered Bonds  under the  DTC system  must be  made by or
through Direct Participants, which will receive  a credit for the Offered  Bonds
on  DTC's  records. The  ownership  interest of  each  actual purchaser  of each
Offered Bond ("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 Offered Bonds 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 Offered Bonds, except in the event that use of the book-entry system for the
Offered Bonds is discontinued.

                                      S-6
<PAGE>
    To   facilitate  subsequent  transfers,  all   Offered  Bonds  deposited  by
Participants with DTC are registered in  the name of DTC's partnership  nominee,
Cede  & Co. The deposit of the Offered  Bonds 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  Offered Bonds; DTC's records
reflect only the  identity of  the Direct  Participants to  whose accounts  such
Offered  Bonds 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 Offered
Bonds. 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
Offered  Bonds are credited on the record date (identified in a listing attached
to the Omnibus Proxy).

    Principal and interest payments  on the Offered Bonds  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 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 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  Offered Bonds at  any time  by giving reasonable  notice to the
Company or  the Trustee.  Under such  circumstances, if  a successor  securities
depository  is not obtained, certificates for  the Offered Bonds are required to
be printed and delivered.

    The Company  may decide  to  discontinue use  of  the system  of  book-entry
transfers  through DTC  (or a successor  securities depository).  In that event,
certificates for the Offered Bonds will 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.

                                      S-7
<PAGE>
                                  UNDERWRITERS

    Subject to the terms and conditions  set forth in an Underwriting  Agreement
dated  February 10, 1994  (the "Underwriting Agreement"),  the Underwriters have
severally agreed to purchase  from the Company the  amount of Offered Bonds  set
forth opposite their names below:

<TABLE>
<CAPTION>
      NAME                                                           AMOUNT
                                                                  ------------
<S>                                                               <C>
Morgan Stanley & Co. Incorporated...............................  $160,000,000
Smith Barney Shearson Inc.......................................    20,000,000
Piper Jaffray Inc...............................................    20,000,000
                                                                  ------------
      Total.....................................................  $200,000,000
                                                                  ------------
                                                                  ------------
</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  .125%  of  the  principal  amount  of  such  Bonds.  The
    Underwriters  may allow, and  such dealers may reallow,  a concession not in
    excess of  .100% 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  or  contribute to  payments the  Underwriters  may be  required to  make in
respect thereof.

    The Offered Bonds  of each  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-8
<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 $600,000,000 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 JANUARY 14, 1994
<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  10045. 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, 1992;

        2.  The Company's Quarterly Reports on Form 10-Q for the quarters  ended
           March 31, 1993, June 30, 1993 and September 30, 1993; and

        3.   The  Company's Current  Reports on Form  8-K dated  March 30, 1993,
           April 28, 1993, May 4, 1993, June 8, 1993, July 16, 1993, August  20,
           1993, October 1, 1993, December 7, 1993 and December 10, 1993.

    All  documents filed by the Company pursuant  to Section 13(a), 19(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  has   one
significant  subsidiary, Northern States Power  Company, a Wisconsin corporation
(the "Wisconsin Company"), and several  other subsidiaries including Viking  Gas
Transmission  Company, a Delaware  corporation, and NRG  Energy, Inc. ("NRG"), a
Delaware corporation. NRG manages many of NSP's non-utility energy subsidiaries.
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   130
communities within this area.

    The  Company serves customers  in Minnesota, North  Dakota and South Dakota.
The Wisconsin  Company  serves  customers  in Wisconsin  and  Michigan.  Of  the
approximately  three million people served by  NSP, the majority is concentrated
in the Minneapolis-St.  Paul Metropolitan Area.  For 1992, about  61 percent  of
NSP's electric retail revenue was derived from sales in the Minneapolis-St. Paul
Metropolitan  Area and about 57  percent of gas revenues  came from sales in the
St. Paul  area. NSP's  electric generation  for 1992  was provided  for by  coal
(60%),  nuclear (35%),  and hydro 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.

                                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  $92.83 million  as of  November 30,  1993. The  specific
allocation  of the proceeds of a particular  series of the Offered Bonds will be
described in the Prospectus Supplement.

                       CONSTRUCTION PROGRAM AND FINANCING

    NSP's utility  capital  expenditures  (including allowance  for  funds  used
during  construction and  excluding business  acquisitions) are  estimated to be
$370 million for 1993 and up to $2.4 billion for the five years ending  December
31,  1997. Included in  these projected capital investments  are $38 million and
$267 million, respectively, for  nuclear fuel for  NSP's three existing  nuclear
units.  The remaining capital investments through  1997 are for numerous utility
projects, none of which  are significantly large relative  to the total  capital
investment   program.  Approximately   90-100%  of  the   1993  utility  capital
expenditures and at least 77% of the 1993-1997 utility capital expenditures  are
expected  to  be provided  by internally  generated funds.  In addition,  NSP is
attempting to reduce its capital expenditures for the period 1993-1997 below the
above estimates. If successful, the  percentage of utility capital  expenditures
provided  by internally  generated funds for  the five-year  period 1993-1997 is
expected to increase.  The foregoing estimates  of utility capital  expenditures
and  internally generated  funds may  be subject  to substantial  changes due to
unforeseen factors, such as changed economic conditions, competitive conditions,
resource planning,  new  government  regulations,  changed  tax  laws  and  rate
regulation.

    Dependent  on  the involvement  in  projects currently  under consideration,
potential capital investments in NSP's non-utility projects are estimated to  be
$160-190  million in 1993  and approximately $550-650 million  for the five year
period 1993-1997.

                                       3
<PAGE>
                    NSP'S RATIO OF EARNINGS TO FIXED CHARGES

<TABLE>
<CAPTION>
                                  TWELVE MONTHS       YEAR ENDED DECEMBER 31,
                                      ENDED         ----------------------------
                                SEPTEMBER 30, 1993  1992  1991  1990  1989  1988
                                ------------------  ----  ----  ----  ----  ----
                                   (UNAUDITED)
<S>                             <C>                 <C>   <C>   <C>   <C>   <C>
Ratio of Earnings to Fixed
 Charges......................            3.6        3.2   3.9   3.7   4.1   4.0
</TABLE>

    For purposes  of computing  the  ratio of  earnings  to fixed  charges,  (i)
earnings  consist  of  income  from continuing  operations  plus  fixed charges,
federal and  state  income  taxes,  deferred income  taxes  and  investment  tax
credits;  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.

    The  annual interest  requirement on  long-term debt  of NSP  outstanding at
September 30, 1993, was $126,894,400.

                            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 41 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  $220,000,000  aggregate   principal  amount  of
outstanding Bonds in December 1993 and January 1994, there will be 17 series  of
Bonds  in an  aggregate principal amount  of $920,900,000  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,
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.

                                       4
<PAGE>
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.

    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 transaction.

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

                                       5
<PAGE>
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 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 the Wisconsin Company,  nor
is the stock of the Wisconsin Company 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  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, 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

                                       6
<PAGE>
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 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 November
30, 1993, the amount  of net Permanent Additions  available for the issuance  of
Bonds  exceeded  $3.7  billion,  of  which $1  billion  could  be  used  for the
authentication of $600 million principal amount of the New Bonds. As of December
15, 1993, $109 million of retired Bonds were available for the authentication of
up to $109 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.)

                                       7
<PAGE>
    Earnings Applicable to Bond Interest  for the twelve months ended  September
30,  1993, would  be 3.6  times the  annual interest  requirements on  the Bonds
including the New  Bonds at an  assumed 8% interest  rate. 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 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. At November 30, 1993, no portion of the
retained earnings of the Company was restricted by the foregoing provision.

    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.)

                                       8
<PAGE>
    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, 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.)

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

                                       9
<PAGE>
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.)

    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.

                                    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  have  been  audited   by  Deloitte  &  Touche,  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

                                       10
<PAGE>
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 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.

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