<SEC-DOCUMENT>0000066756-21-000070.txt : 20210820
<SEC-HEADER>0000066756-21-000070.hdr.sgml : 20210820
<ACCEPTANCE-DATETIME>20210820132845
ACCESSION NUMBER:		0000066756-21-000070
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210819
FILED AS OF DATE:		20210820
DATE AS OF CHANGE:		20210820

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Jimmerson Heidi E
		CENTRAL INDEX KEY:			0001209757

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-03548
		FILM NUMBER:		211193125

	MAIL ADDRESS:	
		STREET 1:		30 W. SUPERIOR STREET
		CITY:			DULUTH
		STATE:			MN
		ZIP:			55802

	FORMER NAME:	
		FORMER CONFORMED NAME:	EDDINS HEIDI J
		DATE OF NAME CHANGE:	20021211

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALLETE INC
		CENTRAL INDEX KEY:			0000066756
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
		IRS NUMBER:				410418150
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		30 W SUPERIOR ST
		CITY:			DULUTH
		STATE:			MN
		ZIP:			55802-2093
		BUSINESS PHONE:		2182795000

	MAIL ADDRESS:	
		STREET 1:		30 W SUPERIOR STREET
		CITY:			DULUTH
		STATE:			MN
		ZIP:			55802-2093

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALLETE
		DATE OF NAME CHANGE:	20000901

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MINNESOTA POWER INC
		DATE OF NAME CHANGE:	19980603

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MINNESOTA POWER & LIGHT CO
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-08-19</periodOfReport>

    <issuer>
        <issuerCik>0000066756</issuerCik>
        <issuerName>ALLETE INC</issuerName>
        <issuerTradingSymbol>ALE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001209757</rptOwnerCik>
            <rptOwnerName>Jimmerson Heidi E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>606 STAFFORD LANE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. AUGUSTINE</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>32086</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-08-19</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3253</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>69.5</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>23006.22</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.44-$69.57, inclusive. The reporting person undertakes to provide to ALLETE, any security holder of ALLETE, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range provided above.</footnote>
        <footnote id="F2">Includes shares acquired in exempt transactions pursuant to the dividend equivalent feature of stock awards deferred under the ALLETE non-employee director deferral plan, based on plan information available as of August 15, 2021.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Ingrid K. Johnson for Heidi E. Jimmerson</signatureName>
        <signatureDate>2021-08-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
