    <SEC-DOCUMENT>0001488139-21-000048-index.html : 20210427
    <SEC-HEADER>0001488139-21-000048.hdr.sgml : 20210427
    <ACCEPTANCE-DATETIME>20210427083857
    ACCESSION NUMBER:		0001488139-21-000048
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		4
    CONFORMED PERIOD OF REPORT:	20210520
    FILED AS OF DATE:		20210427
    DATE AS OF CHANGE:		20210427

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Ameresco, Inc.
    		CENTRAL INDEX KEY:			0001488139
    		STANDARD INDUSTRIAL CLASSIFICATION:	CONSTRUCTION SPECIAL TRADE CONTRACTORS [1700]
    		IRS NUMBER:				043512838
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-34811
    		FILM NUMBER:		21856065

    	BUSINESS ADDRESS:
    		STREET 1:		111 SPEEN STREET
    		CITY:			FRAMINGHAM
    		STATE:			MA
    		ZIP:			01701
    		BUSINESS PHONE:		508-661-2200

    	MAIL ADDRESS:
    		STREET 1:		111 SPEEN STREET
    		CITY:			FRAMINGHAM
    		STATE:			MA
    		ZIP:			01701
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>a2021noticeandproxystateme.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: a2021noticeandproxystateme.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>amrcproxycard_pagex11.jpg
    <DESCRIPTION>PROXY CARD 1
    <TEXT>
    Document 2 - file: amrcproxycard_pagex11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>amrcproxycard_pagex21.jpg
    <DESCRIPTION>PROXY CARD 2
    <TEXT>
    Document 3 - file: amrcproxycard_pagex21.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>image0a031.jpg
    <DESCRIPTION>LOGO
    <TEXT>
    Document 4 - file: image0a031.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>