    <SEC-DOCUMENT>0001213900-22-047625-index.html : 20220815
    <SEC-HEADER>0001213900-22-047625.hdr.sgml : 20220815
    <ACCEPTANCE-DATETIME>20220812203740
    ACCESSION NUMBER:		0001213900-22-047625
    CONFORMED SUBMISSION TYPE:	424B3
    PUBLIC DOCUMENT COUNT:		6
    FILED AS OF DATE:		20220815
    DATE AS OF CHANGE:		20220812

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			cleantech Acquisition Corp.
    		CENTRAL INDEX KEY:			0001849820
    		STANDARD INDUSTRIAL CLASSIFICATION:	GENERAL INDUSTRIAL MACHINERY & EQUIPMENT, NEC [3569]
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		424B3
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-262431
    		FILM NUMBER:		221161978

    	BUSINESS ADDRESS:
    		STREET 1:		1 EAST PUTNAM AVENUE, FLOOR 4
    		CITY:			GREENWICH
    		STATE:			CT
    		ZIP:			06830
    		BUSINESS PHONE:		6464659000

    	MAIL ADDRESS:
    		STREET 1:		1 EAST PUTNAM AVENUE, FLOOR 4
    		CITY:			GREENWICH
    		STATE:			CT
    		ZIP:			06830
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>424B3
    <SEQUENCE>1
    <FILENAME>f424b30822_cleantechacq.htm
    <DESCRIPTION>PROSPECTUS
    <TEXT>
    Document 1 - file: f424b30822_cleantechacq.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>twhitley_header.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: twhitley_header.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>thlb_logo.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: thlb_logo.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>tkroll_logo.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: tkroll_logo.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>tkroll_footer.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: tkroll_footer.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>tsig_duffandphelps.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: tsig_duffandphelps.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>