-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 IwM30N0CPWEWtFs4p+Ag/CBG7XVk4/EfYVfQlGMPyTkslUOr8C4hVi3zj59rBa1d
 sU/SR7IhehQUTS49Z6Bakw==

<SEC-DOCUMENT>0000003673-09-000150.txt : 20091208
<SEC-HEADER>0000003673-09-000150.hdr.sgml : 20091208
<ACCEPTANCE-DATETIME>20091208160440
ACCESSION NUMBER:		0000003673-09-000150
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20091204
FILED AS OF DATE:		20091208
DATE AS OF CHANGE:		20091208

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SARSTEN GUNNAR E
		CENTRAL INDEX KEY:			0001176443

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-00267
		FILM NUMBER:		091228831

	MAIL ADDRESS:	
		STREET 1:		ALLEGHENY ENERGY, INC
		STREET 2:		800 CABIN HILL DRIVE
		CITY:			GREENSBURG
		STATE:			PA
		ZIP:			15601

	FORMER NAME:	
		FORMER CONFORMED NAME:	SARSTEN GUNNAR A
		DATE OF NAME CHANGE:	20020627

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALLEGHENY ENERGY, INC
		CENTRAL INDEX KEY:			0000003673
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				135531602
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		800 CABIN HILL DRIVE
		CITY:			GREENSBURG
		STATE:			PA
		ZIP:			15601
		BUSINESS PHONE:		7248373000

	MAIL ADDRESS:	
		STREET 1:		800 CABIN HILL DRIVE
		CITY:			GREENSBURG
		STATE:			PA
		ZIP:			15601

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALLEGHENY ENERGY INC
		DATE OF NAME CHANGE:	19970926

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALLEGHENY POWER SYSTEM INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WEST PENN ELECTRIC CO
		DATE OF NAME CHANGE:	19660908
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>sarstenform4_1209stksaleex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-12-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000003673</issuerCik>
        <issuerName>ALLEGHENY ENERGY, INC</issuerName>
        <issuerTradingSymbol>AYE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001176443</rptOwnerCik>
            <rptOwnerName>SARSTEN GUNNAR E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ALLEGHENY ENERGY, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>800 CABIN HILL DRIVE</rptOwnerStreet2>
            <rptOwnerCity>GREENSBURG</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>15601</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, $1.25 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2009-12-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>23.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>27858</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Shares sold pursuant to a 10b5-1 Trading Plan dated September 23, 2009.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Amanda J. Skov  Attorney-in-Fact</signatureName>
        <signatureDate>2009-12-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----