<SEC-DOCUMENT>0001562180-21-001240.txt : 20210217
<SEC-HEADER>0001562180-21-001240.hdr.sgml : 20210217
<ACCEPTANCE-DATETIME>20210217190739
ACCESSION NUMBER:		0001562180-21-001240
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210216
FILED AS OF DATE:		20210217
DATE AS OF CHANGE:		20210217

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Eldred Charles N
		CENTRAL INDEX KEY:			0001350048

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32462
		FILM NUMBER:		21646917

	MAIL ADDRESS:	
		STREET 1:		414 SILVER AVE SW MS 1275
		CITY:			ALBUQUERQUE
		STATE:			NM
		ZIP:			87102-3289

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PNM RESOURCES INC
		CENTRAL INDEX KEY:			0001108426
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				850019030
		STATE OF INCORPORATION:			NM
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		414 SILVER AVE. SW
		CITY:			ALBUQUERQUE
		STATE:			NM
		ZIP:			87102-3289
		BUSINESS PHONE:		5052412700

	MAIL ADDRESS:	
		STREET 1:		414 SILVER AVE. SW
		STREET 2:		ATTN: MS 0905 - CATHY MARTINEZ
		CITY:			ALBUQUERQUE
		STATE:			NM
		ZIP:			87102-3289

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MANZANO CORP
		DATE OF NAME CHANGE:	20000303
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primarydocument.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-02-16</periodOfReport>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0001108426</issuerCik>
        <issuerName>PNM RESOURCES INC</issuerName>
        <issuerTradingSymbol>PNM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001350048</rptOwnerCik>
            <rptOwnerName>Eldred Charles N</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2>CORPORATE HEADQUARTERS MS1275</rptOwnerStreet2>
            <rptOwnerCity>ALBUQUERQUE</rptOwnerCity>
            <rptOwnerState>NM</rptOwnerState>
            <rptOwnerZipCode>87158-1275</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>EVP Corp Development &amp; Finance</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Phantom Stock Shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-02-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>50.00</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>50.00</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7564.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>PNM Common Stock Fund - PNM Resources Executive Savings Plan II</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The security converts to common stock on a one-for-one basis.</footnote>
        <footnote id="F2">Reflects the amount of phantom shares acquired under the PNM Resources, Inc. Executive Savings Plan II through notational dividend reinvestment on the cash dividend payment date of February 16, 2021, being the first dividend payment date for PNM Resources' common stock following the termination of dividend reinvestment under the PNM Resources Direct Plan</footnote>
        <footnote id="F3">The phantom stock shares were acquired under the PNM Resources, Inc. Executive Savings Plan II, and will settle upon the Reporting Person's retirement or other termination of service.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Angela L. Pino, POA for Charles N. Eldred</signatureName>
        <signatureDate>2021-02-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
