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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 KhwPyWrQ12/llk7ifQJ6Th/hIbokfe1nGdECYfiSuyASjRlzVW5YeofKbWuCAV61
 VNJtsL6yd+IWxe+887BH8Q==

<SEC-DOCUMENT>0000064463-04-000060.txt : 20041220
<SEC-HEADER>0000064463-04-000060.hdr.sgml : 20041220
<ACCEPTANCE-DATETIME>20041220170643
ACCESSION NUMBER:		0000064463-04-000060
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041216
FILED AS OF DATE:		20041220
DATE AS OF CHANGE:		20041220

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MECHANICAL TECHNOLOGY INC
		CENTRAL INDEX KEY:			0000064463
		STANDARD INDUSTRIAL CLASSIFICATION:	MEASURING & CONTROLLING DEVICES, NEC [3829]
		IRS NUMBER:				141462255
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		431 NEW KARNER ROAD
		STREET 2:		BUILDING #4
		CITY:			ALBANY
		STATE:			NY
		ZIP:			12205
		BUSINESS PHONE:		5185332200

	MAIL ADDRESS:	
		STREET 1:		431 NEW KARNER ROAD
		STREET 2:		BUILDING #4
		CITY:			ALBANY
		STATE:			NY
		ZIP:			12205

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Marusak Thomas J
		CENTRAL INDEX KEY:			0001312027

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-06890
		FILM NUMBER:		041214779

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		518-786-9195

	MAIL ADDRESS:	
		STREET 1:		24 EAST RIDGE ROAD
		CITY:			LOUDONVILLE
		STATE:			NY
		ZIP:			12211
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>mar207.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2004-12-16</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000064463</issuerCik>
        <issuerName>MECHANICAL TECHNOLOGY INC</issuerName>
        <issuerTradingSymbol>MKTY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001312027</rptOwnerCik>
            <rptOwnerName>Marusak Thomas J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>431 NEW KARNER ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ALBANY</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>12205</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>By: Cynthia A. Scheuer as Attorney in Fact for</signatureName>
        <signatureDate>2004-12-20</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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