SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 11-K



(Mark One)

/X/   Annual Report Pursuant to Section 15(d) of the Securities Exchange Act
      of 1934

For the fiscal year ended DECEMBER 31, 2005

                                       or

/ /  Transition Report Pursuant to Section 15(d) of the Securities Exchange Act
     of 1934

For the transition period from                  to
                                 -------------       -------------



                           Commission File No. 1-3548




                    MINNESOTA POWER AND AFFILIATED COMPANIES
                   RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN

                            (Full Title of the Plan)


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


                                  ALLETE, Inc.
                             30 West Superior Street
                          Duluth, Minnesota 55802-2093

                          (Name of issuer of securities
                          held pursuant to the Plan and
                          the address of its principal
                                executive office)

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




                                      INDEX

                                                                            PAGE

Report of Independent Registered Public Accounting Firm                       2

Statement of Net Assets Available for Benefits -
         December 31, 2005 and 2004                                           3

Statement of Changes in Net Assets Available for Benefits -
         Year Ended December 31, 2005                                         4

Notes to Financial Statements                                                 5

Supplemental Schedules

     Schedule I:     Schedule of Assets (Held at End of Year) -
                          December 31, 2005                                  12

     Schedule II:    Schedule of Assets (Acquired and Disposed of
                          Within Year) -
                          Year Ended December 31, 2005                       13

     Schedule III:   Schedule of Reportable Transactions in
                          Excess of 5% of Fair Value of Plan Assets -
                          Year Ended December 31, 2005                       14

Signatures                                                                   15



Note:    Other schedules required by 29 CFR 2520.103.10 of the  U.S.  Department
         of Labor's Rules and Regulations for Reporting and Disclosure under the
         Employee  Retirement  Income Security  Act  of  1974  have been omitted
         because they are not applicable.



1                          ALLETE 2005 RSOP Form 11-K





             REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Participants and Administrator of the
Minnesota Power and Affiliated Companies
Retirement Savings and Stock Ownership Plan


We have audited the accompanying  statement of net assets available for benefits
of the Minnesota  Power and Affiliated  Companies  Retirement  Savings and Stock
Ownership  Plan (the "Plan") as of December  31, 2005 and 2004,  and the related
statement  of changes in net assets  available  for  benefits for the year ended
December 31, 2005.  These  financial  statements are the  responsibility  of the
Plan's  management.  Our  responsibility  is to  express  an  opinion  on  these
financial statements based on our audit.

We conducted our audit of these  statements in accordance  with the standards of
the Public Company Accounting  Oversight Board (United States).  Those standards
require that we plan and perform the audit to obtain reasonable  assurance about
whether the financial  statements  are free of material  misstatement.  An audit
includes  examining,  on a test  basis,  evidence  supporting  the  amounts  and
disclosures in the financial  statements.  An audit also includes  assessing the
accounting  principles  used and significant  estimates made by management,  and
evaluating the overall  financial  statement  presentation.  We believe that our
audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the net assets available for benefits of the Plan as of
December  31,  2005 and 2004,  and the changes in its net assets  available  for
benefits for the year ended  December 31, 2005,  in conformity  with  accounting
principles generally accepted in the United States of America.

Our audit was  conducted  for the  purpose  of  forming  an opinion on the basic
financial statements taken as a whole. The supplemental  schedules,  Schedule of
Assets (Held at End of Year) - December 31, 2005,  Schedule of Assets  (Acquired
and  Disposed of Within  Year) - Year Ended  December  31, 2005 and  Schedule of
Reportable  Transactions  - Year Ended  December 31, 2005, are presented for the
purpose  of  additional  analysis  and are  not a  required  part  of the  basic
financial   statements  but  are  supplementary   information  required  by  the
Department of Labor's rules and Regulations  for Reporting and Disclosure  under
the  Employee  Retirement  Income  Security  Act  of  1974.  These  supplemental
schedules are the  responsibility of the Plan's  management.  These supplemental
schedules have been subjected to the auditing  procedures  applied in the audits
of the basic financial  statements and, in our opinion, are fairly stated in all
material  respects  in  relation to the basic  financial  statements  taken as a
whole.


Reilly, Penner & Benton LLP


Milwaukee, Wisconsin
June 1, 2006


                           ALLETE 2005 RSOP Form 11-K                          2




                                     MINNESOTA POWER AND AFFILIATED COMPANIES
                                    RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                                  STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
                                                     Thousands



                                                                                          DECEMBER 31,
                                                                                  2005                   2004
------------------------------------------------------------------------------------------------------------------
                                                                                                 
ASSETS

     Investments
         Participant Funds                                                      $288,352               $260,432
         Unallocated Funds                                                       116,402                104,877
------------------------------------------------------------------------------------------------------------------

                                                                                 404,754                365,309
------------------------------------------------------------------------------------------------------------------

     Contributions Receivable
         Participant                                                                 207                    305
         Employer                                                                    946                  1,521
------------------------------------------------------------------------------------------------------------------

                                                                                   1,153                  1,826
------------------------------------------------------------------------------------------------------------------

     Cash                                                                              1                      3

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

                                                                                 405,908                367,138
------------------------------------------------------------------------------------------------------------------

LIABILITIES

     Accrued Interest                                                              2,387                  2,387

     Accrued Administrative Expenses                                                 124                      -

     Long-Term Debt                                                               69,818                 69,818
------------------------------------------------------------------------------------------------------------------

                                                                                  72,329                 72,205
------------------------------------------------------------------------------------------------------------------

NET ASSETS AVAILABLE FOR BENEFITS                                               $333,579               $294,933
------------------------------------------------------------------------------------------------------------------

                             The accompanying notes are an integral part of these statements.




3                          ALLETE 2005 RSOP Form 11-K




                                     MINNESOTA POWER AND AFFILIATED COMPANIES
                                    RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                             STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
                                                     Thousands


                                                                          YEAR ENDED DECEMBER 31, 2005
                                                             -----------------------------------------------------
                                                               PARTICIPANT          UNALLOCATED
                                                                  FUNDS                FUNDS              TOTAL
------------------------------------------------------------------------------------------------------------------
                                                                                               
INVESTMENT INCOME
     Dividend Income                                            $  7,511              $ 3,395           $ 10,906
     Interest Income                                                 155                    -                155
     Net Appreciation in Fair Value of Investments                25,394               17,889             43,283
     Other                                                            80                    -                 80
------------------------------------------------------------------------------------------------------------------

                                                                  33,140               21,284             54,424
------------------------------------------------------------------------------------------------------------------

CONTRIBUTIONS
     Participant                                                   8,138                    -              8,138
     Employer                                                          -                2,684              2,684
     Rollover                                                        250                    -                250
------------------------------------------------------------------------------------------------------------------

                                                                   8,388                2,684             11,072
------------------------------------------------------------------------------------------------------------------

DEDUCTIONS
     Participants' Withdrawals                                   (15,950)                   -            (15,950)
     Interest Expense                                                  -               (7,158)            (7,158)
     Administrative Expenses                                          (2)                (446)              (448)
     Redemption Fees                                                  (3)                   -                 (3)
------------------------------------------------------------------------------------------------------------------

                                                                 (15,955)              (7,604)           (23,559)
------------------------------------------------------------------------------------------------------------------

TRANSFERS AND ALLOCATIONS
     Transfers to Retirement Plans                                (3,291)                   -             (3,291)
     Allocations to Participants                                   5,539               (5,539)                 0
------------------------------------------------------------------------------------------------------------------

                                                                   2,248               (5,539)            (3,291)
------------------------------------------------------------------------------------------------------------------

NET INCREASE                                                      27,821               10,825             38,646

NET ASSETS AVAILABLE FOR BENEFITS

     Beginning of Year                                           259,290               35,643            294,933
------------------------------------------------------------------------------------------------------------------

     End of Year                                                $287,111              $46,468           $333,579
------------------------------------------------------------------------------------------------------------------

                         The accompanying notes are an integral part of these statements.


                           ALLETE 2005 RSOP Form 11-K                          4


                    MINNESOTA POWER AND AFFILIATED COMPANIES
                   RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                          NOTES TO FINANCIAL STATEMENTS


NOTE 1 - DESCRIPTION OF THE PLAN

The  Minnesota  Power and  Affiliated  Companies  Retirement  Savings  and Stock
Ownership  Plan  (RSOP or  Plan) is a  contributory  defined  contribution  plan
subject to the  provisions  of the Employee  Retirement  Income  Security Act of
1974, as amended (ERISA),  and qualifies as an employee stock ownership plan and
profit sharing plan. At December 31, 2005, there were 1,778  participants in the
RSOP.  Participating  affiliated  companies  (collectively,  the  Companies)  at
December 31, 2005, included:

     - ALLETE, Inc. (ALLETE, or Company)
     - Minnesota Power (an operating division of ALLETE)
     - Superior Water, Light and Power Company
     - MP Affiliate Resources, Inc.

The RSOP provides eligible employees of the Companies an opportunity to save for
retirement by electing to make  before-tax and after-tax  contributions  through
payroll   deduction,   and  directing  the  contributions  into  various  401(k)
investment options. (See Participant Investment Options.) The RSOP also provides
eligible  employees of the Companies employee stock ownership benefits in ALLETE
common stock (Common Stock).

BASIS OF PRESENTATION

Participant funds represent the participants' 401(k) investment funds and shares
allocated  to  participants  in the ALLETE  RSOP Stock Fund.  Unallocated  funds
represent  unallocated  shares to be allocated to the participants in the ALLETE
RSOP Stock Fund in the future.

ADMINISTRATION

The  Plan is  administered  for the  Companies  by the  Employee  Benefit  Plans
Committee (Committee).  The mailing address of the Committee is 30 West Superior
Street, Duluth,  Minnesota 55802-2093.  The Committee consists of 10 members who
were  appointed by the Board of Directors of ALLETE.  The Board of Directors has
the power to  remove  members  of the  Committee  from  office.  Members  of the
Committee are all employees of the  Companies  and receive no  compensation  for
their services with respect to the Plan.

The  responsibility  of the Committee  includes the  determination of compliance
with the Plan's  eligibility  requirements,  as well as, the  administration and
payment  of  benefits  in a manner  consistent  with  the  terms of the Plan and
applicable law. The Committee has the authority to establish,  modify and repeal
policies and  procedures as it may deem necessary to carry out the provisions of
the Plan. The Committee also has the authority to designate persons to carry out
fiduciary responsibilities (other than trustee responsibilities) under the Plan.
The  Committee  has the power to appoint an  investment  manager or managers (as
defined by ERISA),  attorneys,  accountants  and such other  persons as it shall
deem necessary or desirable in the  administration  of the Plan.  Administration
fees and  expenses  of  agents,  outside  experts,  consultants  and  investment
managers are paid by the  Companies or the Plan.  The Plan charges  participants
who take  participant  loans or use the Plan's  self-managed  brokerage  account
feature for expenses relating to such loans or accounts.

Ameriprise  Retirement  Services  (Ameriprise),  a service  group of  Ameriprise
Financial  Services,  Inc. and Ameriprise Trust Company, is the service provider
for the Plan handling participant recordkeeping and certain other administrative
responsibilities.  Ameriprise  allows  the  Plan to  value  accounts  daily  and
provides  participants with on-line capability to direct the investment of their
account balances.  Ameriprise Trust Company  (Trustee),  which is located at 994
Ameriprise Financial Center, Minneapolis,  Minnesota, 55474-0507, is the trustee
for the Plan.  The Trustee  carries $20 million of blanket bond insurance and $5
million of professional  liability insurance.  Prior to August 2005,  Ameriprise
was  known  as  American  Express  Retirement  Services;   Ameriprise  Financial
Services,  Inc. was known as American  Express  Financial  Advisors,  Inc.;  and
Ameriprise  Trust  Company  was known as  American  Express  Trust  Company.  In
September  2005,   American  Express  Financial   Corporation  spun  off  as  an
independent service provider Ameriprise  Financial,  Inc., the parent company of
Ameriprise Financial Services, Inc. and Ameriprise Trust Company.


5                          ALLETE 2005 RSOP Form 11-K


NOTE 1 - DESCRIPTION OF THE PLAN (CONTINUED)

PARTICIPANT INVESTMENT OPTIONS

The Plan's  401(k)  investment  fund options at December  31,  2005,  are listed
below.  Detailed  descriptions  of the investment  options and risk profiles are
available in the corresponding fund's prospectus.

     - ALLETE Stock Fund
     - RiverSource Trust Bond Index Fund II
     - RiverSource Trust Income Fund II
     - RiverSource Trust Small Cap Equity Index Fund II
     - Artisan International Fund
     - Dodge & Cox Stock Fund
     - Dodge & Cox International Fund
     - HighMark Small Cap Value Fund
     - MainStay Large Cap Growth Fund
     - The Oakmark Equity and Income Fund
     - Oppenheimer Developing Markets Fund
     - Vanguard Institutional Index Fund
     - Vanguard Mid-Cap Index Fund
     - William Blair Small Cap Growth Fund

Participants  may also establish a self-managed  brokerage  account which allows
the  participant  to  make  investments  in or  transfers  to a  wide  range  of
securities,   including   publicly  traded  stocks,   bonds  and  mutual  funds.
Participants  who have a  self-managed  brokerage  account  pay an annual fee in
addition to any trading fees incurred upon investment changes.

Participants  may change their level of  contribution,  change their  investment
elections for future contributions and make transfers between investment options
at any time by contacting Ameriprise.

REDEMPTION  FEES. In 2005,  certain mutual funds began charging  redemption fees
that are paid out of the participant's account. A redemption fee is charged when
shares are  transferred  or exchanged out of the fund before the fund's  minimum
holding period has been met.




SUMMARY OF                                            EFFECTIVE              REDEMPTION               MINIMUM
REDEMPTION FEES BY FUND                                 DATE                    FEE               HOLDING PERIOD
-------------------------------------------------------------------------------------------------------------------
                                                                                         
Artisan International Fund                          June 1, 2005             2 percent                90 days
Oppenheimer Developing Markets                      June 1, 2005             2 percent                30 days
William Blair Small Cap Growth Fund                 June 1, 2005             1 percent                60 days
-------------------------------------------------------------------------------------------------------------------


EMPLOYEE STOCK OWNERSHIP BENEFITS - ALLETE RSOP STOCK FUND

ALLETE  sponsors a leveraged  employee  stock  ownership  plan (ESOP) within the
RSOP.  Eligible  employees  of the  Companies  receive  Common  Stock  ownership
benefits in the ALLETE RSOP Stock Fund.  These benefits are primarily  funded by
payments made by the Plan on a loan (see Loan  Account).  Shares of Common Stock
are allocated to eligible  employees as provided by the Plan (see Basic Account,
Special  Account,  Partnership  Account,  Bargaining  Unit  Account and Matching
Account).  The shares of Common Stock allocated to a  participant's  ALLETE RSOP
Stock  Fund  come  from  the  Loan  Account,   as  determined  by  ALLETE.  Each
participant's account value, however, is determined on a unit basis and consists
of both Common  Stock and cash.  (See Note 5.) The unit value is  adjusted  each
business day to reflect investment results, including cash.

Dividends are  automatically  reinvested in Common Stock held in the ALLETE RSOP
Stock Fund; however,  participants may make an election, at any time, to receive
cash dividends paid on certain  eligible  shares.  Units within a  participant's
Basic  Pre-1989  Account  can be  withdrawn  at any time,  while all other units
within  a  participant's  ALLETE  RSOP  Stock  Fund  can be  withdrawn  when the
participant  reaches  age 59  1/2 or  terminates  employment.  Participants  may
transfer all or any part of their ALLETE RSOP Stock Fund,  excluding their Basic
Pre-1989 Account, to other 401(k) investment options at any time.

                           ALLETE 2005 RSOP Form 11-K                          6



NOTE 1 - DESCRIPTION OF THE PLAN (CONTINUED)

LOAN ACCOUNT. The RSOP was amended in 1990 to establish a leveraged Loan Account
and borrow $75 million (RSOP Loan) to acquire  2,830,188  newly issued shares of
Common Stock  (1,886,792  shares  adjusted for stock splits) from ALLETE for the
benefit of eligible participants. Under this amendment, active participants with
a Basic  Account are allocated  shares to their Special  Account with a value at
least equal to: (a) dividends  payable on shares held by those  participants  in
the Plan and (b) tax savings  generated from the deductibility of dividends paid
on all  shares  of  Common  Stock  held in the RSOP as of  August  4,  1989.  In
accordance with this  amendment,  a promissory note was issued to ALLETE for $75
million at a 10.25%  interest rate with a term not to exceed 25 years.  The Loan
Account  may also  provide  for  other  allocation  types as  determined  by the
Company.

BASIC  ACCOUNT.  Participants'  Basic Accounts  received  shares of Common Stock
purchased with incremental investment tax credit contributions and payroll-based
tax credit  contributions.  Contributions  to the  participants'  Basic Accounts
ceased after 1986.

SPECIAL ACCOUNT.  For the years 1985 through 1989, the Companies  received a tax
deduction  for cash  dividends  paid to  participants  on ALLETE RSOP Stock Fund
shares in their Basic  Account.  The  Companies  contributed  to the ALLETE RSOP
Stock Fund an amount equal to the  estimated  income tax benefit of the dividend
deduction associated with eligible shares in the Basic Account. Shares of Common
Stock  purchased with these  contributions  were allocated to the  participants'
Special Account.

PARTNERSHIP ACCOUNT. Since 1989, partnership  allocations have been made to each
nonunion participant's Partnership Account based on the ratio of a participant's
annual compensation to the annual compensation of all eligible participants.  If
the value of the shares credited to a participant's  Partnership Account is less
than  3.5  percent  of  the  participant's  eligible  annual  compensation,  the
Companies will contribute additional shares to equal 3.5 percent.

BARGAINING  UNIT ACCOUNT.  Quarterly  non-elective  allocations  are made to the
ALLETE RSOP Stock Fund equal to 1.0 percent of each union participant's eligible
compensation.

MATCHING  ACCOUNT.  Quarterly  matching  allocations are made to the ALLETE RSOP
Stock Fund equal to 50 percent of each nonunion  participant's 401(k) before-tax
contributions,  disregarding  contributions  in  excess  of  4  percent  of  the
participant's periodic pay for the period.

CONTRIBUTIONS

PARTICIPANT CONTRIBUTIONS to the Plan consist of the following:

     -   BEFORE-TAX  CONTRIBUTIONS. Before-tax contributions consist  of  salary
         reduction  contributions,  results sharing  contributions  and flexible
         dollar contributions.  Total before-tax contributions in 2005 could not
         exceed  $14,000  for  participants  less  than  age 50 or  $18,000  for
         participants  at least age 50, as permitted under Section 401(k) of the
         Internal Revenue Code (Code).

         -   SALARY  REDUCTION  CONTRIBUTIONS.  Salary  reduction  contributions
             are  equal  to  an amount  the  participant  has  elected to reduce
             his or her compensation pursuant to a salary reduction agreement.

         -   RESULTS SHARING CONTRIBUTIONS. Results  sharing  contributions  are
             equal to the portion (up to 100  percent)  of  the Results  Sharing
             Award  the  participant  irrevocably  elects  to  forgo  and  that,
             pursuant to the ALLETE  Results  Sharing  Program,  would otherwise
             be  paid  to  the participant.

     -   VOLUNTARY CONTRIBUTIONS (AFTER-TAX CONTRIBUTIONS). Each participant  is
         also  allowed to make  voluntary  after-tax  contributions  to the Plan
         through payroll  deductions.  Total voluntary  contributions  made by a
         participant may not exceed 25 percent of the participant's compensation
         in any pay period.

     -   ROLLOVERS.  Contributions  by  participants  may  also be made  through
         rollovers from other qualified plans or individual retirement accounts.


7                          ALLETE 2005 RSOP Form 11-K




NOTE 1 - DESCRIPTION OF THE PLAN (CONTINUED)

EMPLOYER  CONTRIBUTIONS  for each year are paid to the Trustee either in cash or
in Common Stock.  Expenses incurred in discretionary  activities relating to the
design,  formation  and  modification  of the Plan  (commonly  characterized  as
"settlor" functions) are paid by the Companies.

VESTING AND FORFEITURE ACCOUNT

As of July 1, 2001, all  contributions  plus actual  earnings  thereon are fully
vested and  nonforfeitable.  In 2005, the Plan was amended to allow distribution
checks issued and outstanding for more than 180 days (unclaimed  benefits) to be
redeposited  into the Plan and treated as  forfeitures.  A  forfeiture  account,
which  consists  of  previously   forfeited  nonvested  accounts  and  unclaimed
benefits,  totaled  $30,000 at December 31, 2005  ($27,000 at December 31, 2004)
and is invested in RiverSource Trust Income Fund II. Dollars from the forfeiture
account may be used to reduce future Plan expenses.

DISTRIBUTIONS AND WITHDRAWALS

A participant may elect,  at any time, to receive in cash future  dividends paid
on Common Stock shares in their  ALLETE RSOP Stock Fund Basic  Pre-1989  Account
and ALLETE Stock Fund.

Prior to termination,  a participant may withdraw,  at any time, all or any part
of their:
     -  Plan  accounts,  if the  participant  has  attained  age 59 1/2;
     -  After-tax  account,  regardless of the  participant's  age; or
     -  Pre-1989  Basic Account, regardless of the participant's age.

When participants  terminate  employment,  become disabled or die, they or their
beneficiaries may elect to receive all or any part of their Plan accounts.

TRANSFERS  TO  RETIREMENT  PLANS.  Upon  retirement,  participants  may elect to
transfer  their Plan  account  balances to the  Minnesota  Power and  Affiliated
Companies Retirement Plan A or Plan B, if the participant is receiving a benefit
from one of these retirement  plans. The amount of transfers to these retirement
plans totaled $3,291,000 for 2005.

LOAN  PROGRAM.  The Plan  allows  participants  to borrow  money from their Plan
accounts.  The maximum amount a participant may borrow is equal to the lesser of
(a) the  participant's  aggregate  before-tax  account,  after-tax  account  and
rollover account  balances,  (b) 50 percent of their total Plan balance,  or (c)
$50,000,  less the largest  outstanding  loan balance owed in the prior 12-month
period.  The loans may not be less  than  $1,000.  The loans are for terms up to
five years for a general  purpose  loan and ten years for the  acquisition  of a
primary residence. A fixed interest rate of the prime rate plus 1 percent on the
first day of the month that the loan is  originated is charged until the loan is
repaid. As loans are repaid, generally through payroll deductions, principal and
interest  amounts  are  redeposited  into  the   participant's   Plan  accounts.
Participants are required to pay a $50 loan application fee to cover the cost of
processing the loan.

PLAN TERMINATION

The  Companies  reserve  the  right to  reduce,  suspend  or  discontinue  their
contributions to the Plan, at any time, or to terminate the Plan in its entirety
subject to the provisions of ERISA and the Code. If the Plan is terminated,  all
of the account  balances of the  participants  will be distributed in accordance
with the terms of the Plan.


NOTE 2 - SUMMARY OF ACCOUNTING POLICIES

The Plan uses the accrual basis of accounting and, accordingly,  reflects income
in the year earned and  expenses  when  incurred.  Common  stock and mutual fund
investments  are  reported  at their fair value based on quoted  market  prices.
Collective fund  investments are reported at net asset value which  approximates
fair  value.  Participants'  loans are  reported at  estimated  fair value which
represents outstanding principal and any related accrued interest.

                           ALLETE 2005 RSOP Form 11-K                          8




NOTE 2 - SUMMARY OF ACCOUNTING POLICIES (CONTINUED)

The preparation of financial statements in conformity with accounting principles
generally  accepted in the United States of America requires  management to make
estimates  and  assumptions   that  affect  the  reported   amounts  of  assets,
liabilities  and  changes  therein,  and  disclosure  of  contingent  assets and
liabilities at the date of the financial statements. Actual results could differ
from those estimates.

The Plan  presents,  in the  statement  of changes in net assets  available  for
benefits,  the  net  appreciation  (depreciation)  in  the  fair  value  of  its
investments  which  consists  of  the  realized  gains  or  losses  on  disposed
investments and the unrealized appreciation  (depreciation) on those investments
owned at year end.

The Plan invests in various  funds that are a combination  of stocks,  bonds and
other investment securities.  Investment securities are exposed to various risks
such as  interest  rate,  market  and  credit  risks.  Due to the  level of risk
associated  with  certain  investment  securities,  it  is at  least  reasonably
possible that changes in the values of investment  securities  will occur in the
near term and that such changes could materially  affect the amounts reported in
the statement of net assets available for benefits.

NOTE 3 - ALLETE SPIN-OFF AND REVERSE STOCK SPLIT

On September  20, 2004,  ALLETE spun off ADESA,  Inc.  (ADESA),  its  Automotive
Services business, by distributing to ALLETE shareholders all of ALLETE's shares
of ADESA common stock.  One share of ADESA common stock was distributed for each
outstanding  share of ALLETE  common  stock held as of the  September  13, 2004,
record date. On September 20, 2004, ALLETE's  one-for-three reverse common stock
split also became effective. All Common Stock amounts have been adjusted for all
periods to reflect the one-for-three reverse stock split.

Participants  in the ALLETE RSOP Stock Fund and the ALLETE Stock Fund received a
pro rata share of ADESA  common stock based on the  unitization  formula used to
determine each  participant's  equivalent number of ALLETE shares on the date of
the  spin-off.  The ADESA RSOP Stock Fund and the ADESA Stock Fund (ADESA Funds)
were  established to capture the ADESA shares  received in the spin-off and were
not investment fund options.  Participants could transfer out of the ADESA Funds
at any time.  The decision to transfer out of either of the ADESA Funds resulted
in a sale of ADESA  common  stock,  but did not result in a  purchase  of ALLETE
common stock unless the participant  chose to transfer those funds to the ALLETE
Stock Fund. In September 2005, an independent  trustee,  hired by ALLETE,  began
selling any  remaining  ADESA common stock and  purchasing  ALLETE  common stock
according to the  requirements of the RSOP. All the ADESA common stock was sold,
and the  purchase of ALLETE  Common  Stock was  completed  on October 25,  2005.
Remaining  participant balances in the ADESA RSOP Stock Fund and the ADESA Stock
Fund were transferred to the corresponding ALLETE RSOP Stock Fund and the ALLETE
Stock Fund on November 15, 2005.

As a result of the  September  2004  spin-off of ADESA,  the RSOP  received  3.3
million  shares of ADESA common stock  related to unearned ESOP shares that have
not been  allocated  to  participants.  The RSOP was  required to sell the ADESA
common  stock and use the proceeds to purchase  ALLETE  Common Stock on the open
market. Under the direction of an independent trustee, at December 31, 2004, the
RSOP had sold all of these ADESA  shares  which  resulted  in total  proceeds of
$65.9 million and had used $35.6 million of the proceeds to purchase 1.0 million
shares of ALLETE common stock during the fourth  quarter of 2004. As of February
15, 2005,  the remaining  $30.3 million of proceeds from the sale of 3.3 million
shares of ADESA common stock related to unallocated ESOP shares had been used to
purchase 759,725 shares of ALLETE Common Stock.


NOTE 4 - FEDERAL INCOME TAX STATUS

A favorable  determination  letter dated March 23, 2004,  was obtained  from the
Internal  Revenue  Service  stating  that the  RSOP,  as  amended  and  restated
effective  January 1, 2002,  qualified as an employee stock ownership plan and a
profit sharing plan under Section 401(a) of the Code.

The Plan has  subsequently  been amended and the Committee  continues to believe
that the Plan is currently  designed and being  operated in compliance  with the
applicable  requirements of the Code.  Therefore,  no provision for income taxes
has been included in the Plan's financial statements.

9                           ALLETE 2005 RSOP Form 11-K



NOTE 5 - INVESTMENTS




FAIR/NET ASSET VALUE OF INVESTMENTS
REPRESENTING 5 PERCENT OR MORE OF ASSETS
AT DECEMBER 31,                                                                        2005                 2004
--------------------------------------------------------------------------------------------------------------------
Thousands
                                                                                                    
ALLETE RSOP Stock Fund                                                               $198,783             $158,523
ADESA RSOP Stock Fund                                                                     N/A              $41,711
RiverSource Trust Income Fund II                                                      $44,356              $37,267
ALLETE Stock Fund                                                                     $28,499                  N/A
Vanguard Institution Index Fund                                                       $26,446                  N/A
The Oakmark Equity and Income Fund                                                    $20,438                  N/A
--------------------------------------------------------------------------------------------------------------------




                                                                 NUMBER OF                                 FAIR
ALLETE RSOP STOCK FUND                                            SHARES               COST                VALUE
--------------------------------------------------------------------------------------------------------------------
Thousands
                                                                                                 
December 31, 2005        Allocated    - Common Stock              1,855               $48,615             $ 81,606
                                        Money Market                                      775                  775
--------------------------------------------------------------------------------------------------------------------

                                                                                       49,390               82,381
--------------------------------------------------------------------------------------------------------------------

                         Unallocated  - Common Stock              2,612                40,103              114,952
                                        Money Market                                    1,450                1,450
--------------------------------------------------------------------------------------------------------------------

                                                                                       41,553              116,402
--------------------------------------------------------------------------------------------------------------------

                                                                                      $90,943             $198,783
--------------------------------------------------------------------------------------------------------------------

December 31, 2004        Allocated    - Common Stock              1,443               $27,991             $ 53,049
                                        Money Market                                      597                  597
--------------------------------------------------------------------------------------------------------------------

                                                                                       28,588               53,646
--------------------------------------------------------------------------------------------------------------------

                         Unallocated  - Common Stock              2,002                30,921               73,555
                                        Money Market                                   31,322               31,322
--------------------------------------------------------------------------------------------------------------------

                                                                                       62,243              104,877
--------------------------------------------------------------------------------------------------------------------

                                                                                      $90,831             $158,523
--------------------------------------------------------------------------------------------------------------------





                                                                 NUMBER OF                                  FAIR
ADESA RSOP STOCK FUND                                             SHARES               COST                 VALUE
--------------------------------------------------------------------------------------------------------------------
Thousands
                                                                                                  
December 31, 2004        Allocated    - Common Stock              1,926               $13,274              $40,861
                                        Money Market                                      850                  850
--------------------------------------------------------------------------------------------------------------------

                                                                                      $14,124              $41,711
--------------------------------------------------------------------------------------------------------------------


For the ALLETE  Stock Fund and the ALLETE  RSOP Stock Fund,  each  participant's
account  value is  determined  on a unit basis and consists of both Common Stock
and cash  invested  in a money  market  fund.  The unit value is  adjusted  each
business day to reflect investment results including cash.




                                             ALLETE STOCK FUND                          ALLETE RSOP STOCK FUND
                                         ---------------------------------------------------------------------------
AT DECEMBER 31,                             2005             2004                       2005                 2004
--------------------------------------------------------------------------------------------------------------------
Thousands
                                                                                               
Number of Units                             5,139            2,519                     13,996               10,891

Common Stock                              $27,989          $11,477                    $81,606              $53,049
Money Market                                  510              198                        775                  597
--------------------------------------------------------------------------------------------------------------------

Net Value                                 $28,499          $11,675                    $82,381              $53,646
--------------------------------------------------------------------------------------------------------------------


                            ALLETE 2005 RSOP Form 11-K                        10



NOTE 5 - INVESTMENTS (CONTINUED)

In  November  2005,  participant  balances  in the ADESA RSOP Stock Fund and the
ADESA Stock Fund were  transferred to the  corresponding  ALLETE RSOP Stock Fund
and the ALLETE Stock Fund.  (See Note 3.) Each  participant's  account value for
these funds was  determined  on a unit basis and  consisted of both common stock
and cash invested in a money market fund.




AT DECEMBER 31, 2004                                ADESA STOCK FUND                     ADESA RSOP STOCK FUND
--------------------------------------------------------------------------------------------------------------------
Thousands
                                                                                   
Number of Units                                           1,142                                   3,178

Common Stock                                            $14,296                                 $40,861
Money Market                                                587                                     850
--------------------------------------------------------------------------------------------------------------------

Net Value                                               $14,883                                 $41,711
--------------------------------------------------------------------------------------------------------------------


NOTE 6 - REPAYMENT OF LOANS

The Trustee  repays  principal and interest on the RSOP Loan with dividends paid
on the shares of Common  Stock in the Loan  Account  and with  certain  employer
contributions  to the Plan.  The shares of Common Stock  acquired by the Trustee
are held in the Loan Account, and allocated to the accounts of Plan participants
as the RSOP Loan is repaid.

The RSOP Loan was obtained from ALLETE. There were 2,612,540  unallocated shares
of  Common  Stock in the Plan  pledged  as  collateral  at  December  31,  2005.
Prepayments of principal can be made without  penalty.  The lender has no rights
to shares that are allocated under the Plan.

                                PRINCIPAL PAYMENTS
                              $75 MILLION 10.25% LOAN
                       ------------------------------------
                                    Thousands
                         2011                      $ 9,818
                         2012                       15,000
                         2013                       15,000
                         2014                       15,000
                         2015                       15,000
                       ------------------------------------

                                                   $69,818
                       ------------------------------------


NOTE 7 - DEPARTMENT OF LABOR EXAMINATION

In October 2005, the U.S.  Department of Labor (DOL) began an examination of the
RSOP. At the time of this filing,  the DOL had not provided  management  with an
estimated  completion  date for the  examination.  Management  is unaware of any
findings related to the examination.


NOTE 8 - SUBSEQUENT EVENT

On June 1, 2006,  Ameriprise  Financial,  Inc., the parent company of Ameriprise
Financial  Services,  Inc.  and  Ameriprise  Trust  Company,  sold  its  defined
contribution recordkeeping business to Wachovia Bank, N.A., a large, diversified
financial  services company.  Ameriprise will continue to provide  recordkeeping
and  directed  trustee  services  to the RSOP for a period of time  until  these
services can be transitioned to Wachovia.

11                           ALLETE 2005 RSOP Form 11-K




                                                                      SCHEDULE I


                                       MINNESOTA POWER AND AFFILIATED COMPANIES
                                      RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                              PLAN NUMBER 002 / EMPLOYER IDENTIFICATION NUMBER 41-0418150
                                       SCHEDULE OF ASSETS (HELD AT END OF YEAR)
                                             FORM 5500 SCHEDULE H LINE 4i
                                                 AT DECEMBER 31, 2005
                                                       Thousands

(a)                       (b)                                             (c)                  (d)           (e)

                                                                    DESCRIPTION OF                         CURRENT
                  IDENTITY OF ISSUER                                  INVESTMENT              COST      VALUE
--------------------------------------------------------------------------------------------------------------------
                                                                                                 
    ALLETE RSOP STOCK FUND
  *  ALLETE, Inc.                                            Common Stock - 4,467 Shares      $88,718     $196,558
  *  RiverSource Money Market II                             Money Market                       2,225        2,225
--------------------------------------------------------------------------------------------------------------------

          Total ALLETE RSOP Stock Fund                                                        $90,943      198,783
--------------------------------------------------------------------------------------------------------------------

    ALLETE STOCK FUND
  *  ALLETE, Inc.                                            Common Stock - 636 Shares                      27,989
  *  RiverSource Money Market II                             Money Market                                      510
--------------------------------------------------------------------------------------------------------------------

          Total ALLETE Stock Fund                                                                           28,499
--------------------------------------------------------------------------------------------------------------------

    COLLECTIVE FUND SECURITIES
  *  RiverSource Trust Bond Index Fund II                    Collective Fund - 376 Shares                    5,467
  *  RiverSource Trust Income Fund II                        Collective Fund - 1,737 Shares                 44,356
  *  RiverSource Trust Small Cap Equity Index Fund II        Collective Fund - 113 Shares                    2,310
--------------------------------------------------------------------------------------------------------------------

          Total Collective Fund Securities                                                                  52,133
--------------------------------------------------------------------------------------------------------------------

    MUTUAL FUND SECURITIES
     Artisan International Fund                              Mutual Fund - 261 Shares                        6,597
     Dodge & Cox International                               Mutual Fund - 77 Shares                         2,692
     Dodge & Cox Stock Fund                                  Mutual Fund - 88 Shares                        12,061
     Highmark Small Cap Value Fund                           Mutual Fund - 671 Shares                       11,623
     Mainstay Large Cap Growth Fund                          Mutual Fund - 297 Shares                        1,650
     The Oakmark Equity and Income Fund                      Mutual Fund - 818 Shares                       20,438
     Oppenheimer Developing Markets Fund                     Mutual Fund - 473 Shares                       17,195
     Vanguard Institutional Index Fund                       Mutual Fund - 232 Shares                       26,446
     Vanguard Mid-Cap - Institutional Fund                   Mutual Fund - 593 Shares                       10,486
     William Blair Small Cap Growth Fund                     Mutual Fund - 428 Shares                       10,344
--------------------------------------------------------------------------------------------------------------------

          Total Mutual Fund Securities                                                                     119,532
--------------------------------------------------------------------------------------------------------------------

    SELF-MANAGED BROKERAGE ACCOUNTS                                                                          2,904
--------------------------------------------------------------------------------------------------------------------

  * PARTICIPANT LOANS                                        Loans Receivable from
                                                             Participants - 5% to 13.65%                     2,903
--------------------------------------------------------------------------------------------------------------------

    TOTAL INVESTMENTS                                                                                     $404,754
--------------------------------------------------------------------------------------------------------------------
*  Party in Interest

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

  Not required for participant directed transactions.




                            ALLETE 2005 RSOP Form 11-K                        12




                                                                     SCHEDULE II


                                       MINNESOTA POWER AND AFFILIATED COMPANIES
                                      RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                              PLAN NUMBER 002 / EMPLOYER IDENTIFICATION NUMBER 41-0418150
                               SCHEDULE OF ASSETS (ACQUIRED AND DISPOSED OF WITHIN YEAR)
                                             FORM 5500 SCHEDULE H LINE 4i
                                       FOR THE YEAR ENDED DECEMBER 31, 2005 
                                                       Thousands

              (a)                                   (b)                        (c)                       (d)

        DESCRIPTION OF                                                       COST OF                   PROCEEDS
      IDENTITY OF ISSUER                        INVESTMENT                ACQUISITIONS              OF DISPOSITIONS
--------------------------------------------------------------------------------------------------------------------
                                                                                           
RiverSource Money Market I                     Money Market                    $141                       $141

RiverSource Money Market II                    Money Market                 $31,738                    $31,738

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

 Excludes participant directed transactions, which are not required on this schedule.




13                           ALLETE 2005 RSOP Form 11-K




                                                                    SCHEDULE III


                                       MINNESOTA POWER AND AFFILIATED COMPANIES
                                      RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN
                              PLAN NUMBER 002 / EMPLOYER IDENTIFICATION NUMBER 41-0418150
                                          SCHEDULE OF REPORTABLE TRANSACTIONS
                                     IN EXCESS OF 5% OF FAIR VALUE OF PLAN ASSETS
                                             FORM 5500 SCHEDULE H LINE 4j
                                       FOR THE YEAR ENDED DECEMBER 31, 2005 
                                                       Thousands


         (a)                 (b)            (c)        (d)       (e)        (f)        (g)        (h)        (i)

                                                                                                CURRENT      NET
     IDENTITY OF         DESCRIPTION     PURCHASE    SELLING    LEASE     EXPENSE    COST OF     VALUE     GAIN OR
   PARTY INVOLVED         OF ASSET         PRICE      PRICE    RENTAL    INCURRED     ASSET    OF ASSET    (LOSS)
--------------------------------------------------------------------------------------------------------------------
                                                                                   
SINGLE TRANSACTION

RiverSource                 Money
    Money Market II        Market         $10,563       -         -          -          -       $10,563           -

RiverSource                 Money
    Money Market I         Market            -       $10,563      -          -       $10,563    $10,563          $0


SERIES OF TRANSACTIONS
  - SAME SECURITY

ADESA, Inc.                Common
                            Stock            -       $29,756      -          -       $11,019    $29,756     $18,737

ALLETE, Inc.               Common
                            Stock         $58,868       -         -          -          -       $58,868           -

ALLETE, Inc.               Common
                            Stock            -        $185        -          -         $61       $185          $124

RiverSource                 Money
    Money Market I         Market          $141         -         -          -          -        $141             -

RiverSource                 Money
    Money Market I         Market            -       $31,066      -          -       $31,066    $31,066          $0

RiverSource                 Money
    Money Market II        Market         $33,487       -         -          -          -       $33,487           -

RiverSource                 Money
    Money Market II        Market            -       $31,782      -          -       $31,782    $31,782          $0

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

 Excludes participant directed transactions, which are not required on this schedule.




                            ALLETE 2005 RSOP Form 11-K                        14




                                   SIGNATURES

Pursuant to the  requirements  of the Securities  Exchange Act of 1934,  ALLETE,
Inc., as plan administrator,  has duly caused this annual report to be signed on
its behalf by the undersigned hereunto duly authorized.



                                 MINNESOTA POWER AND AFFILIATED COMPANIES
                               RETIREMENT SAVINGS AND STOCK OWNERSHIP PLAN


                            By:     ALLETE, Inc., its Plan Administrator
                            ----------------------------------------------------



June 6, 2006                                 Donald J. Shippar
                            ----------------------------------------------------
                                             Donald J. Shippar
                               Chairman, President and Chief Executive Officer


15                          ALLETE 2005 RSOP Form 11-K




                                INDEX TO EXHIBITS


EXHIBIT
-------

   a     -    Consent of Independent Registered Public Accounting Firm







                            ALLETE 2005 RSOP Form 11-K



                                                                       EXHIBIT a



            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


We consent to the incorporation by reference in the Registration  Statement (No.
333-124455) on Form S-8 of ALLETE,  Inc. of our report dated June 1, 2006,  with
respect to the statements of net assets  available for benefits of the Minnesota
Power and Affiliated  Companies  Retirement Savings and Stock Ownership Plan for
the years ended December 31, 2005 and 2004, the related statements of changes in
net assets  available for benefits for the year ended December 31, 2005, and the
related supplemental  schedules as of December 31, 2005, which report appears in
the December 31, 2005,  annual  report on Form 11-K of the  Minnesota  Power and
Affiliated Companies Retirement Savings and Stock Ownership Plan.


Reilly, Penner & Benton LLP

Reilly, Penner & Benton LLP
Milwaukee, Wisconsin
June 1, 2006