<SUBMISSION>
<ACCESSION-NUMBER>0001181431-08-015232
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20080228
<FILING-DATE>20080303
<DATE-OF-FILING-DATE-CHANGE>20080303
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>WEISBERG ROBERT I
<CIK>0001185772
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-32393
<FILM-NUMBER>08659590
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>1855 NORMAN AVENUE
<CITY>SANTA CLARA
<STATE>CA
<ZIP>95054
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>ENVIRONMENTAL POWER CORP
<CIK>0000805012
<ASSIGNED-SIC>4991
<IRS-NUMBER>042782065
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>ONE CATE STREET
<STREET2>4TH FLOOR
<CITY>PORTSMOUTH
<STATE>NH
<ZIP>03801
<PHONE>6034311780
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>ONE CATE STREET
<STREET2>4TH FLOOR
<CITY>PORTSMOUTH
<STATE>NH
<ZIP>03801
</MAIL-ADDRESS>
</ISSUER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd197818.xml
<DESCRIPTION>R WEISBERG FEBRUARY 28, 2008 SAR GRANT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-02-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000805012</issuerCik>
        <issuerName>ENVIRONMENTAL POWER CORP</issuerName>
        <issuerTradingSymbol>( EPG )</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001185772</rptOwnerCik>
            <rptOwnerName>WEISBERG ROBERT I</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>41 WEST SHORE DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BELVEDERE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94920</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Appreciation Right</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>4.97</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-02-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>29558</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-02-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>29558</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>29558</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The stock appreciation right may be settled in cash, in shares of common stock, or in a combination of cash or shares, at the election of the Company.</footnote>
        <footnote id="F2">The stock appreciation right becomes exercisable in three equal installments on March 31, 2008, May 30, 2008 and July 31, 2008, provided that the recipient continues to provide consulting services to the Company as of such dates.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Scott E. Pueschel, Attorney-in-Fact</signatureName>
        <signatureDate>2008-03-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
