Exhibit 4(l)


                                    GUARANTEE
                                       OF
                         MINNESOTA POWER & LIGHT COMPANY


                  For  value  received,  Minnesota  Power  &  Light  Company,  a
corporation duly organized and existing under the laws of the State of Minnesota
(herein called the "Guarantor"),  hereby fully and unconditionally guarantees to
the  Trustee  under  the  Indenture,  dated as of May 15,  1996,  between  ADESA
Corporation (the "Company") and The Bank of New York, as Trustee  (together with
any amendments thereto, the "Indenture"),  the payment of the obligations of the
Company under the  Securities of the First Series and the Indenture  relating to
such series, including,  without limitation, the due and punctual payment of the
principal of and premium,  if any, and interest on the  Securities  of the First
Series when and as the same shall become due and payable, whether at maturity or
upon redemption or upon declaration or otherwise, according to the terms thereof
and of the  Indenture.  In case of the failure of the Company  punctually to pay
any such principal, premium, if any, or interest, the Guarantor hereby agrees to
cause any such payment to be made  punctually  when and as the same shall become
due and payable,  whether at maturity or upon redemption or upon  declaration or
otherwise, and as if such payment were made by the Company. The Guarantor hereby
agrees  that  its  obligations   hereunder  shall  be  full  and  unconditional,
irrespective of the validity,  legality or  enforceability  of the Securities of
the First  Series or the  Indenture,  the  absence of any action to enforce  the
same,  the waiver or consent by the Holder of the Securities of the First Series
or by the Trustee with respect to any provisions  thereof or of said  Indenture,
the  recovery of any  judgment  against the Company or any action to enforce the
same or any other  circumstance  which  might  otherwise  constitute  a legal or
equitable  discharge  or defense of a guarantor.  The  Guarantor  hereby  waives
diligence,  presentment, demand of payment, filing of claims with a court in the
event of merger or bankruptcy of the Company,  any right to require a proceeding
first against the Company,  protest or notice with respect to the  Securities of
the  First  Series  or the  indebtedness  evidenced  thereby,  and  all  demands
whatsoever,  and covenants that this Guarantee will not be discharged  except by
complete performance of the obligations contained in the Securities of the First
Series and in this Guarantee.

                  The Guarantor  hereby  guarantees  that the obligations of the
Company under the Securities of the First Series and the Indenture to the extent
related  to  such  series  will  be  paid  to the  Trustee  without  set-off  or
counterclaim or other reduction  whatsoever  (whether for taxes,  withholding or
otherwise) in lawful currency of the United States of America.

                  The obligations of the Guarantor  hereunder are independent of
the  obligations of the Company under the Securities of the First Series and the
Indenture to the extent related to such series, and a separate action or actions
may be brought and prosecuted  against the Guarantor whether or not an action or
proceeding  is brought  against  the  Company  and whether or not the Company is
joined  in any  such  action  or  proceeding.  The  liability  of the  Guarantor
hereunder  is full and  unconditional  and (to the extent  permitted by law) the
liability  and  obligations  of the Guarantor  hereunder  shall not be released,
discharged,  mitigated,  waived, impaired or affected in whole or in part by any
circumstance  (including any statute of  limitations)  (other than payment) that
might  constitute  a defense  available  to, or  discharge of the Company or the
Guarantor,   including,   without   limitation,   any  termination,   amendment,
modification, addition, deletion, supplement or other change to any of the terms
of the Securities of the First Series or the Indenture,  any failure on the part
of the Trustee or any Holder to enforce,  assert or exercise any right, power or
remedy,  any  waiver,  consent,  extension,  renewal,  indulgence,   compromise,
release,  settlement,  refunding or other action or inaction under or in respect
of any obligation or liability of the Company or the Guarantor or the Trustee or
any  Holder,  or any  modification,  compromise,




settlement or release by the Trustee,  or by operation of law or  otherwise,  of
the  obligations  or the  liability of the Company  under the  Securities of the
First Series, in whole or in part.

                  The  Guarantor  agrees  that if at any time all or any part of
any payment at any time received by the Trustee or the Holders of the Securities
of the First  Series is or must be  rescinded or returned by the Trustee or such
Holders  for  any  reason  whatsoever   (including,   without  limitation,   the
insolvency,  reorganization or bankruptcy of the Company),  then the Guarantor's
obligations hereunder shall, to the extent of the payment rescinded or returned,
be deemed to have continued in existence  notwithstanding  such previous receipt
by the Trustee or such Holders, and the Guarantor's  obligations hereunder shall
continue to be effective or  reinstated,  as the case may be, as if such payment
had never been made.

                  The  failure of the  Trustee  to  enforce  any right or remedy
hereunder,  or promptly to enforce any right or remedy hereunder, or promptly to
enforce any such right or remedy,  shall not  constitute a waiver  thereof,  nor
give rise to any estoppel against the Trustee, nor excuse the Guarantor from its
obligations hereunder.

                  No reference  herein to the Indenture and no provision of this
Guarantee  or of the  Indenture  shall  alter or  impair  the  guarantee  of the
Guarantor, which is absolute and unconditional,  of the due and punctual payment
of the  principal  of and  premium,  if any, and interest on the Security of the
series upon which this Guarantee is endorsed.

                  The Guarantor  shall be subrogated to all rights of the Holder
of the  Securities  of the First  Series  against  the Company in respect of any
amounts paid by the Guarantor  pursuant to the provisions of this Guarantee upon
payment by the Guarantor of all amounts due and payable under such Guarantee.

                  This  Guarantee  shall be  irrevocable  unless  terminated  as
provided  herein.  This Guarantee shall be terminated upon the assumption by the
Guarantor of the  obligations  of the Company under the  Securities of the First
Series and the Indenture to the extent related to such series as provided in the
terms of such Securities.

                  All  capitalized  terms used in this  Guarantee  which are not
defined  herein but are defined in the  Indenture  shall have the  meanings  set
forth in the Indenture.

                  This Guarantee shall be deemed to be a contract made under the
laws of the State of New York and  shall for all  purposes  be  governed  by and
construed in accordance with the laws of such State.

Section 1.  Consolidation, Merger and Sale of Assets.

                  During the term of this  Guarantee,  the  Guarantor  shall not
consolidate  with or merge into any other  corporation,  or convey or  otherwise
transfer or lease its properties and assets  substantially as an entirety to any
Person, unless

               (a) the corporation  formed by such  consolidation  or into which
      the  Guarantor is merged or the Person  which  acquires by  conveyance  or
      transfer,  or which  leases,  the  properties  and assets of the Guarantor
      substantially  as an  entirety  shall be a Person  organized  and  validly
      existing  under the laws of the United  States,  any State  thereof or the
      District of Columbia,  and shall expressly assume,  the obligations of the
      Guarantor under this Guarantee;

                                      -2-


               (b) immediately  after giving effect to such transaction no Event
      of Default,  and no event  which,  after  notice or lapse of time or both,
      would become an Event of Default,  shall have occurred and be  continuing;
      and

               (c)  the  Guarantor  shall  have  delivered  to  the  Trustee  an
      Officer's  Certificate (as hereinafter  defined) and an Opinion of Counsel
      (as hereinafter  defined),  each stating that such consolidation,  merger,
      conveyance,  or other  transfer or lease and such  supplemental  indenture
      comply  with  this  Guarantee  and that all  conditions  precedent  herein
      provided for relating to such transactions have been complied with.

               Upon any  consolidation  by the  Guarantor  with or merger by the
Guarantor  into any other  corporation or any  conveyance,  or other transfer or
lease of the properties and assets of the Company  substantially  as an entirety
in  accordance  with this  Section,  the  successor  corporation  formed by such
consolidation  or into which the Guarantor is merged or the Person to which such
conveyance,  transfer or lease is made shall succeed to, and be substituted for,
and may exercise  every right and power of, the Guarantor  under this  Guarantee
and under the terms of the Securities of the First Series (including  assumption
of the  obligations  under  the  Securities  of the First  Series  and under the
Indenture to the extent  related to such series) with the same effect as if such
successor Person had been named as the Guarantor herein, and thereafter,  except
in the  case of a  lease,  the  predecessor  Person  shall  be  relieved  of all
obligations and covenants under this Guarantee.

Section 2. Limitation on Liens.

               A.      The Guarantor  shall  not  suffer  any Lien  (other  than
Permitted  Liens)  to be  created  or to exist  upon any  property  (other  than
Excepted Property) of the Guarantor,  real,  personal or mixed, of whatever kind
or nature and located in the State of  Minnesota,  whether  owned at the date of
the execution and delivery of this Guarantee or hereafter  acquired,  all except
as expressly contemplated in subsection B of this Section.

               B.      The  provisions of subsection A shall not prohibit the 
creation or existence  of any Lien on property of the  Guarantor  which  secures
indebtedness for borrowed money if either:

                       1. the Guarantor shall make effective  provision  whereby
               this  Guarantee  shall be secured  equally and  ratably  with the
               indebtedness secured by such Lien; or

                       2. the  Guarantor  shall  deliver to the  Trustee  bonds,
               notes or other  evidences  of  indebtedness  secured by such Lien
               (hereinafter  called "Secured  Obligations")  (a) in an aggregate
               principal  amount equal to the aggregate  principal amount of the
               Securities of the First Series then Outstanding, (b) maturing (or
               being subject to mandatory  redemption) on such dates and in such
               principal amounts that, at each Stated Maturity of the Securities
               of the First Series,  there shall mature (or be redeemed) Secured
               Obligations  equal in principal  amount to the  Securities of the
               First  Series then to mature and (c)  containing,  in addition to
               any  mandatory  redemption  provisions  applicable to all Secured
               Obligations   outstanding  under  such  Lien  and  any  mandatory
               redemption  provisions  contained  therein pursuant to clause (b)
               above,   mandatory  redemption  provisions   correlative  to  the
               provisions,  if any, for the mandatory  redemption (pursuant to a
               sinking fund or otherwise) of the  Securities of the First Series
               or for the  redemption  thereof at the option of the  Holder,  as
               well as a provision for mandatory redemption upon an acceleration
               of the maturity of all Outstanding Securities of 

                                      -3-


               the First Series  following an Event of Default  (such  mandatory
               redemption   to  be  rescinded   upon  the   rescission  of  such
               acceleration);  it being  expressly  understood that such Secured
               Obligations  (x) may, but need not, bear  interest,  (y) may, but
               need not,  contain  provisions for the redemption  thereof at the
               option  of the  issuer,  any  such  redemption  to be  made  at a
               redemption  price or prices  not less than the  principal  amount
               thereof  and (z) shall be held by the  Trustee for the benefit of
               the Holders of all  Securities  of the First  Series from time to
               time Outstanding subject to such terms and conditions relating to
               surrender  to  the  Guarantor,  transfer  restrictions,   voting,
               application  of  payments of  principal  and  interest  and other
               matters as shall be set forth in an indenture supplemental hereto
               specifically  providing  for the  delivery to the Trustee of such
               Secured Obligations.

               C.      If the  Guarantor  shall elect either of the alternatives
described in  subsection  B, the Guarantor shall deliver to the Trustee:

                       1. an  amendment  to this  Guarantee  (a)  together  with
               appropriate inter-creditor  arrangements,  whereby this Guarantee
               shall be secured by the Lien  referred to in subsection B equally
               and ratably with all other  indebtedness  secured by such Lien or
               (b)  providing  for  the  delivery  to  the  Trustee  of  Secured
               Obligations;

                       2. an  Officer's  Certificate  (a) stating  that,  to the
               knowledge of the signer, (I) no Event of Default has occurred and
               is  continuing  and (II) no event has occurred and is  continuing
               which  entitles the secured  party under such Lien to  accelerate
               the maturity of the indebtedness  outstanding  thereunder and (b)
               stating the aggregate principal amount of indebtedness  issuable,
               and then proposed to be issued, under and secured by such Lien;

                       3. an Opinion of Counsel (a) if this  Guarantee  is to be
               secured by such Lien,  to the effect that all  Securities  of the
               First Series then Outstanding are entitled to the benefit of such
               Lien equally and ratably with all other indebtedness  outstanding
               under such Lien or (b) if Secured Obligations are to be delivered
               to the Trustee,  to the effect that such Secured Obligations have
               been  duly   issued   under  such  Lien  and   constitute   valid
               obligations,  entitled  to the  benefit of such Lien  equally and
               ratably with all other  indebtedness  then outstanding under such
               Lien.

               D.      For all purposes of this  Guarantee,  except as otherwise
expressly  provided or unless the context otherwise requires:
                       
                       "Excepted Property" means

                       (a)  all  cash on hand or in  banks  or  other  financial
               institutions,  deposit  accounts,  shares of stock,  interests in
               general or  limited  partnerships,  bonds,  notes,  evidences  of
               indebtedness and other securities not hereafter paid or delivered
               to,  deposited with or held by the Trustee  hereunder or required
               so to be;

                       (b)  all  contracts,  leases,  operating  agreements, and
               other  agreements  of  whatsoever  kind and nature;  all contract
               rights,  bills,  notes and other  instruments  and chattel  paper
               (except to the extent that any of the same constitute securities,
               in which case they are  separately  excepted from this  Guarantee
               under clause (a) above); all revenues,  income and earnings,  all
               accounts,  accounts  receivable  and unbilled  revenues,  and all
               rents,  tolls,  issues,  

                                      -4-


               product and profits,  claims, credits, demands and judgments; all
               governmental and other licenses,  permits,  franchises,  consents
               and  allowances;  all patents,  patent  licenses and other patent
               rights, patent applications, trade names, trademarks, copyrights,
               claims,  credits,  choses in action and other intangible property
               and general intangibles  including,  but not limited to, computer
               software;

                       (c)  All  automobiles,   buses,   trucks,  truck  cranes,
               tractors,  trailers and similar  vehicles and movable  equipment;
               all rolling stock,  rail cars and other railroad  equipment;  all
               vessels, boats, barges and other marine equipment; all airplanes,
               helicopters,  aircraft  engines and other flight  equipment;  all
               parts,  accessories  and supplies used in connection  with any of
               the foregoing;  and all personal  property of such character that
               the  perfection  of a  security  interest  therein  or other Lien
               thereon is not  governed  by the  Uniform  Commercial  Code as in
               effect in the jurisdiction in which such property is located;

                       (d) all goods,  stock in trade,  wares,  merchandise  and
               inventory  held for the purpose of sale or lease in the  ordinary
               course of business; all materials,  supplies, inventory and other
               items of personal  property which are consumable  (otherwise than
               by ordinary  wear and tear) in their use in the  operation of any
               property of the  Guarantor;  all fuel,  including  nuclear  fuel,
               whether  or not  any  such  fuel is in a form  consumable  in the
               operation of any property of the  Guarantor,  including  separate
               components  of any fuel in the  forms in  which  such  components
               exist at any time  before,  during or after the period of the use
               thereof as fuel; all hand and other portable tools and equipment;
               all furniture and furnishings; and computers and data processing,
               data storage,  data  transmission,  telecommunications  and other
               facilities, equipment and apparatus, which, in any case, are used
               primarily  for   administrative   or  clerical  purposes  or  are
               otherwise not necessary for the operation or  maintenance  of the
               facilities, machinery, equipment or fixtures of the Guarantor for
               (i) the  generation,  transmission  or  distribution  of electric
               energy, (ii) the transmission,  storage or distribution of gas or
               (iii) the appropriation, storage, transmission or distribution of
               water;

                       (e) all coal,  ore,  gas, oil and other  minerals and all
               timber,  and all rights and  interests  in any of the  foregoing,
               whether or not such  minerals or timber  shall have been mined or
               extracted or otherwise  separated from the land; and all electric
               energy,  gas  (natural  or  artificial),  steam,  water and other
               products   generated,   produced,   manufactured,   purchased  or
               otherwise acquired by the Guarantor;

                       (f) all real  property,  leaseholds,  gas rights,  wells,
               gathering,  tap or other pipe lines, or facilities,  equipment or
               apparatus,  in any  case  used  or to be used  primarily  for the
               production or gathering of natural gas;

                       (g) all hydroelectric  plants and all lands, power sites,
               flowage rights, water rights, riparian rights, permits, licenses,
               franchises,   privileges,   leaseholds,  water  locations,  water
               appropriations,  ditches,  flumes,  reservoirs,  reservoir sites,
               canals,  raceways,   dams,  dam  sites,  aqueducts,   structures,
               facilities,  equipment,  or apparatus,  in any case used or to be
               used  primarily in connection  with the  Company's  hydroelectric
               plants; and

                       (h)  all leasehold interests held by the Guarantor as
               lessee.

                                      -5-


                       "Lien"  means  any  mortgage,   deed  of  trust,  pledge,
security  interest,  encumbrance,  easement,  lease,  reservation,  restriction,
servitude,  charge or similar  right and any other lien of any kind,  including,
without limitation, any conditional sale or other title retention agreement, any
lease  in the  nature  thereof,  and  any  defect,  irregularity,  exception  or
limitation in record title.

                       "Officer's  Certificate" means a certificate signed by an
Authorized Officer and delivered to the Trustee.  "Authorized Officer" means the
Chairman of the Board,  the President,  any Vice President,  the Treasurer,  any
Assistant  Treasurer,  or any  other  officer  or  agent of the  Guarantor  duly
authorized  by the Board of Directors  to act in respect of matters  relating to
this Guarantee.  "Board of Directors" means either the board of directors of the
Guarantor or any committee  thereof duly authorized to act in respect of matters
relating to this Guarantee.

                       "Opinion of Counsel" means a written  opinion of counsel,
who may be  counsel  for the  Guarantor,  or  other  counsel  acceptable  to the
Trustee.

                       "Permitted  Liens" means, as of any particular  time, any
of the following:

                       (a) Liens for taxes,  assessments and other  governmental
               charges or  requirements  which are not  delinquent  or which are
               being contested in good faith by appropriate proceedings;

                       (b) mechanics',  workmen's,  repairmen's,  materialmen's,
               warehousemen's  and  carriers'  Liens,  other  Liens  incident to
               construction,  Liens  or  privileges  of  any  employees  of  the
               Guarantor  for salary or wages earned,  but not yet payable,  and
               other  Liens,  including  without  limitation  Liens for worker's
               compensation  awards,  arising in the ordinary course of business
               for charges or requirements which are not delinquent or which are
               being contested in good faith and by appropriate proceedings;

                       (c) Liens in respect of attachments,  judgments or awards
               arising out of judicial or  administrative  proceedings (i) in an
               aggregate amount not exceeding Ten Million Dollars  ($10,000,000)
               or (ii) with  respect  to which the  Guarantor  shall (X) in good
               faith be prosecuting an appeal or other proceeding for review and
               with respect to which the Guarantor  shall have secured a stay of
               execution pending such appeal or other proceeding or (Y) have the
               right to prosecute an appeal or other proceeding for review;

                       (d) easements,  leases,  reservations  or other rights of
               others in, on, over,  and/or across,  and laws,  regulations  and
               restrictions affecting, and defects,  irregularities,  exceptions
               and limitations in title to, the property of the Guarantor or any
               part thereof;  provided,  however,  that such easements,  leases,
               reservations, rights, laws, regulations,  restrictions,  defects,
               irregularities,   exceptions  and   limitations  do  not  in  the
               aggregate  materially  impair  the  use by the  Guarantor  of its
               property  considered  as a whole for the purposes for which it is
               held by the Guarantor;

                       (e) defects,  irregularities,  exceptions and limitations
               in title to real property  subject to  rights-of-way  in favor of
               the Guarantor or otherwise or used or to be used by the Guarantor
               primarily for  right-of-way  purposes or real property held under
               lease,  easement,  license or similar right;  provided,  however,
               that (i) the  Guarantor  shall have  obtained  from the  apparent
               owner or owners of such real property a sufficient  right, by the
               terms  of  the  

                                      -6-


               instrument granting such right-of-way,  lease, easement,  license
               or similar  right,  to the use thereof for the purposes for which
               the  Guarantor  acquired the same,  (ii) the  Guarantor has power
               under eminent domain or similar  statutes to remove such defects,
               irregularities,  exceptions or limitations or (iii) such defects,
               irregularities,  exceptions  and  limitations  may  be  otherwise
               remedied   without   undue   effort  or  expense;   and  defects,
               irregularities,  exceptions  and  limitations  in  title to flood
               lands, flooding rights and/or water rights;

                       (f)  Liens  securing  indebtedness  or other  obligations
               neither  created,  assumed nor guaranteed by the Guarantor nor on
               account of which it customarily  pays interest upon real property
               or  rights  in or  relating  to  real  property  acquired  by the
               Guarantor for the purpose of the  transmission or distribution of
               electric  energy,  gas or water,  for the purpose of  telephonic,
               telegraphic, radio, wireless or other electronic communication or
               otherwise for the purpose of obtaining rights-of-way;

                       (g)  leases  existing  at the date of the  execution  and
               delivery  of this  Guarantee  affecting  properties  owned by the
               Guarantor at said date and renewals and extensions  thereof;  and
               leases affecting such properties  entered into after such date or
               affecting  properties  acquired by the Guarantor  after such date
               which, in either case, (i) have respective terms of not more than
               ten (10) years (including extensions or renewals at the option of
               the  tenant)  or (ii)  do not  materially  impair  the use by the
               Guarantor  of such  properties  for the  respective  purposes for
               which they are held by the Guarantor;

                       (h) Liens vested in lessors,  licensors,  franchisors  or
               permitters  for rent or other  amounts to become due or for other
               obligations or acts to be performed, the payment of which rent or
               the  performance  of which other  obligations or acts is required
               under leases, subleases, licenses, franchises or permits, so long
               as the payment of such rent or other  amounts or the  performance
               of such other  obligations  or acts is not delinquent or is being
               contested in good faith and by appropriate proceedings;

                       (i) controls,  restrictions,  obligations,  duties and/or
               other burdens imposed by federal,  state, municipal or other law,
               or by rules,  regulations or orders of Governmental  Authorities,
               upon  any  property  of the  Guarantor  or the  operation  or use
               thereof or upon the Guarantor with respect to any of its property
               or the operation or use thereof or with respect to any franchise,
               grant,  license,  permit or public  purpose  requirement,  or any
               rights   reserved  to  or   otherwise   vested  in   Governmental
               Authorities   to   impose   any  such   controls,   restrictions,
               obligations, duties and/or other burdens;

                       (j) rights  which  Governmental  Authorities  may have by
               virtue of franchises,  grants, licenses, permits or contracts, or
               by virtue of law, to purchase, recapture or designate a purchaser
               of or order  the sale  of,  any  property  of the  Guarantor,  to
               terminate franchises,  grants,  licenses,  permits,  contracts or
               other  rights or to regulate  the  property  and  business of the
               Guarantor;   and  any  and  all   obligations  of  the  Guarantor
               correlative to any such rights;

                       (k) Liens required by law or governmental regulations (i)
               as a condition to the transaction of any business or the exercise
               of any  privilege  or license,  (ii) to enable the  Guarantor  to
               maintain   self-insurance   or  to   participate   in  any  funds
               established  to cover any  insurance  risks,  (iii) in connection
               with  workmen's  compensation,   unemployment  insurance,

                                      -7-

               social  security,  any pension or welfare benefit plan or (iv) to
               share  in the  privileges  or  benefits  required  for  companies
               participating  in one or more of the  arrangements  described  in
               clauses (ii) and (iii) above;

                       (l)  Liens on property of the Guarantor which are granted
               by  the  Guarantor  to  secure  duties  or  public  or  statutory
               obligations or to secure,  or serve in lieu of,  surety,  stay or
               appeal bonds;

                       (m)  rights  reserved  to or  vested in others to take or
               receive any part of any coal,  ore, gas, oil and other  minerals,
               any timber and/or any electric  capacity or energy,  gas,  water,
               steam and any other products, developed, produced,  manufactured,
               generated, purchased or otherwise acquired by the Guarantor or by
               others on property of the Guarantor;

                       (n) (i) rights and  interests  of Persons  other than the
               Guarantor   arising  out  of  contracts,   agreements  and  other
               instruments to which the Guarantor is a party and which relate to
               the common ownership or joint use of property; and (ii) all Liens
               on the  interests of Persons other than the Guarantor in property
               owned in common by such  Persons and the  Guarantor if and to the
               extent that the  enforcement  of such Liens  would not  adversely
               affect the  interests of the  Guarantor  in such  property in any
               material respect;

                       (o) any restrictions on assignment and/or requirements of
               any  assignee to qualify as a permitted  assignee  and/or  public
               utility or public service corporation;

                       (p) any Liens  which have been bonded for the full amount
               in dispute or for the  payment of which other  adequate  security
               arrangements have been made;

                       (q) grants, by the Guarantor of easements,  ground leases
               or  rights-of-way  in, upon,  over and/or  across the property or
               rights-of-way  of the  Guarantor  for the purpose of roads,  pipe
               lines,  transmission  lines,  distribution  lines,  communication
               lines, railways, removal of coal or other minerals or timber, and
               other  like  purposes,  or for the  joint or  common  use of real
               property,  rights-of-way,  facilities and/or equipment; provided,
               however,  that no such grant shall  materially  impair the use of
               the  property or  rights-of-way  for the  purposes for which such
               property or rights-of-way are held by the Guarantor;

                       (r)      Prepaid Liens;

                       (s) Purchase  Money Liens and any other Liens existing or
               placed upon property at the time of, or within one hundred eighty
               (180) days after, the acquisition  thereof by the Guarantor,  and
               any extensions, renewals and/or replacements of any such Liens to
               secure any refundings,  refinancings  and/or  replacements of the
               indebtedness  secured thereby;  provided,  however,  that no such
               Purchase  Money Lien or other  Lien shall  extend to or cover any
               property of the Guarantor other than (i) the property so acquired
               and  improvements,  extensions and additions to such property and
               renewals,  replacements and substitutions of or for such property
               or any part or parts  thereof  and (ii) with  respect to Purchase
               Money  Liens,  other  property   subsequently   acquired  by  the
               Guarantor;

                       (t)  Liens on  property  of the  Guarantor  which  secure
               indebtedness  for borrowed money which matures less than one year
               from the date of the  issuance or  incurrence  thereof 

                                      -8-


               and is not  extendible  at the  option  of the  issuer,  and  any
               extensions,  renewals  and/or  replacements  of any such Liens to
               secure any refundings,  refinancings  and/or replacements of such
               indebtedness by or with similar indebtedness;

                       (u)  Liens   created  or  assumed  by  the  Guarantor  in
               connection  with the issuance of debt  securities the interest on
               which is not  included  in gross  income for  purposes of federal
               income taxation  pursuant to Section 103 of the Internal  Revenue
               Code of 1986, as amended (or any successor provision of law), for
               the purpose of financing, in whole or in part, the acquisition or
               construction  of  property  to be used by the  Guarantor,  to the
               extent that such Lien is required in connection with the issuance
               of such debt securities either by applicable law or by the issuer
               of such debt  securities  or is  otherwise  necessary in order to
               establish or maintain such exclusion  from gross income;  and any
               extensions,  renewals  and/or  replacements  of any such Liens to
               secure any refundings,  refinancings  and/or  replacement of such
               debt securities by or with similar securities;

                       (v)  Liens securing indebtedness or lease obligations (i)
               which are related to the  construction or acquisition of property
               not  previously  owned by the Guarantor or (ii) which are related
               to the  financing  of a  project  involving  the  development  or
               expansion of property of the  Guarantor  and (iii) the obligee in
               respect of which has no recourse to the Guarantor or any property
               of the Guarantor other than the property  constructed or acquired
               with the  proceeds of such  transaction  or the project  financed
               with the proceeds of such transaction (or the proceeds thereof);

                       (w)  Liens created by the Mortgage and Deed of Trust 
               dated  September 1, 1945 between the  Guarantor  and Irving Trust
               Company  (now The Bank of New  York) and  Richard  H. West (W. T.
               Cunningham,  successor), as Trustees, as heretofore and hereafter
               supplemented and amended (the  "Mortgage");  and Liens created by
               any other indenture  hereafter executed by the Guarantor pursuant
               to  which  bonds  issued  under  the  Mortgage  are  or are to be
               delivered to the  trustee(s)  under such indenture in a principal
               amount at least equal to the principal  amount of debt securities
               to be secured by such indenture; and

                       (x) in addition to the Permitted Liens defined in clauses
               (a) through  (w) above,  Liens on any  property of the  Guarantor
               (other  than  Excepted  Property)  to  secure   indebtedness  for
               borrowed money (under  circumstances not otherwise  excepted from
               the operation of this Section) in an aggregate  principal  amount
               not  exceeding  2.5% of the total assets of the Guarantor and its
               consolidated  subsidiaries,  as shown on the latest balance sheet
               of the Guarantor and its  consolidated  subsidiaries,  audited by
               independent certified public accountants, dated prior to the date
               of the issuance or incurrence of such indebtedness.

                       "Prepaid  Lien"  means  any  Lien  securing  indebtedness
for the  payment,  prepayment  or  redemption  of which  there  shall  have been
irrevocably  deposited  in trust with the  trustee or other  holder of such Lien
moneys and/or Investment Securities which (together with the interest reasonably
expected  to be  earned  from the  investment  and  reinvestment  in  Investment
Securities of the moneys and/or the principal of and interest on the  Investment
Securities  so  deposited)  shall  be  sufficient  for such  purpose;  provided,
however,  that if such indebtedness is to be redeemed or otherwise prepaid prior
to the stated  maturity  thereof,  any notice  requisite to such  redemption  or
prepayment shall have been given in accordance with the instrument creating such
Lien or  irrevocable  instructions  to give such notice shall have been given to
such trustee or other holder. As used herein,  the term "Investment  Securities"
means 

                                      -9-


any of the following  obligations  or securities on which neither the Guarantor,
any other  obligor on the  Securities  of the First Series nor any  Affiliate of
either is the obligor: (a) Government Obligations;  (b) interest bearing deposit
accounts  (which may be represented by  certificates of deposit) in any national
or state bank (which may include the Trustee or any Paying Agent) or savings and
loan  association  which  has  outstanding  securities  rated  by  a  nationally
recognized  rating  organization  in  either  of  the  two  (2)  highest  rating
categories  (without regard to modifiers) for short term securities or in any of
the three (3) highest rating  categories  (without regard to modifiers) for long
term  securities;  (c)  bankers'  acceptances  drawn  on  and  accepted  by  any
commercial  bank (which may include the Trustee or any Paying  Agent)  which has
outstanding  securities rated by a nationally  recognized rating organization in
either of the two (2) highest rating  categories  (without  regard to modifiers)
for short term  securities or in any of the three (3) highest rating  categories
(without regard to modifiers) for long term securities;  (d) direct  obligations
of, or  obligations  the principal of and interest on which are  unconditionally
guaranteed  by, any State or Territory  of the United  States or the District of
Columbia, or any political subdivision of any of the foregoing,  which are rated
by a nationally  recognized rating organization in either of the two (2) highest
rating categories  (without regard to modifiers) for short term securities or in
any of the three (3) highest rating categories (without regard to modifiers) for
long  term  securities;  (e)  bonds  or  other  obligations  of  any  agency  or
instrumentality  of the United States;  (f) corporate debt securities  which are
rated by a nationally  recognized  rating  organization in either of the two (2)
highest  rating  categories   (without  regard  to  modifiers)  for  short  term
securities or in any of the three (3) highest rating categories  (without regard
to modifiers) for long term securities;  (g) repurchase  agreements with respect
to any of the foregoing  obligations or securities with any banking or financial
institution  (which may  include  the  Trustee or any  Paying  Agent)  which has
outstanding  securities rated by a nationally  recognized rating organization in
either of the two (2) highest rating  categories  (without  regard to modifiers)
for short term  securities or in any of the three (3) highest rating  categories
(without regard to modifiers) for long term securities; (h) securities issued by
any regulated investment company (including any investment company for which the
Trustee or any Paying  Agent is the  advisor),  as defined in Section 851 of the
Internal Revenue Code of 1986, as amended, or any successor section of such Code
or successor  federal  statute,  provided that the portfolio of such  investment
company is limited to  obligations or securities of the character and investment
quality contemplated in clauses (a) through (f) above and repurchase  agreements
which are fully collateralized by any of such obligations or securities; and (i)
any other  obligations  or  securities  which may  lawfully be  purchased by the
Trustee in its capacity as such.

                       "Purchase Money Lien" means, with respect to any property
being acquired by the Guarantor, a Lien on such property which

                       (a) is taken or retained  by the  transferor  of such  
               property to secure all or part of the purchase price thereof;

                       (b) is  granted  to one or more  Persons  other  than the
               transferor  which, by making advances or incurring an obligation,
               give value to enable the  grantor of such Lien to acquire  rights
               in or the use of such property;

                       (c) is held by a trustee or agent for the  benefit of one
               or more Persons  described  in clause (a) or (b) above,  provided
               that such Lien may be held,  in addition,  for the benefit of one
               or more other Persons which shall have theretofore  given, or may
               thereafter  give,  value to or for the  benefit or account of the
               grantor of such Lien for one or more other purposes; or

                                      -10-


                       (d) otherwise constitutes a purchase money  mortgage or a
               purchase money security  interest under applicable law;

and,  without  limiting the  generality of the  foregoing,  for purposes of this
Guarantee,  the term  Purchase  Money Lien  shall be deemed to include  any Lien
described  above whether or not such Lien (x) shall permit the issuance or other
incurrence of additional indebtedness secured by such Lien on such property, (y)
shall permit the subjection to such Lien of additional property and the issuance
or other  incurrence of additional  indebtedness on the basis thereof and/or (z)
shall have been granted prior to the acquisition of such property,  shall attach
to or otherwise  cover property  other than the property  being acquired  and/or
shall secure  obligations  issued prior and/or subsequent to the issuance of the
obligations delivered in connection with such acquisition.

                                      -11-



               IN WITNESS  WHEREOF,  MINNESOTA  POWER & LIGHT COMPANY has caused
this  Guarantee to be executed in its corporate  name by the manual or facsimile
signature of its Chairman of the Board of Directors or its  President or any one
of its Vice  Presidents  and its  corporate  seal or a  facsimile  thereof to be
impressed  or  imprinted  hereon,  and the same to be  attested by the manual or
facsimile signature of its Secretary or any one of its Assistant Secretaries.

      Dated:  May 30, 1996

                                                MINNESOTA POWER & LIGHT COMPANY

[Corporate Seal]

                                                By  Edwin L. Russell
                                                   ----------------------------
Attest:                                                             President


Sean MacPherson
- ----------------------------
Assistant Secretary

                                      -12-