    <SEC-DOCUMENT>0001437749-22-012928-index.html : 20220518
    <SEC-HEADER>0001437749-22-012928.hdr.sgml : 20220518
    <ACCEPTANCE-DATETIME>20220518165912
    ACCESSION NUMBER:		0001437749-22-012928
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		3
    CONFORMED PERIOD OF REPORT:	20220518
    FILED AS OF DATE:		20220518
    DATE AS OF CHANGE:		20220518

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NextDecade Corp.
    		CENTRAL INDEX KEY:			0001612720
    		STANDARD INDUSTRIAL CLASSIFICATION:	NATURAL GAS TRANSMISSION & DISTRIBUTION [4923]
    		IRS NUMBER:				465723951
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-36842
    		FILM NUMBER:		22939951

    	BUSINESS ADDRESS:
    		STREET 1:		1000 LOUISIANA STREET
    		STREET 2:		SUITE 3900
    		CITY:			HOUSTON
    		STATE:			TX
    		ZIP:			77002
    		BUSINESS PHONE:		7135741880

    	MAIL ADDRESS:
    		STREET 1:		1000 LOUISIANA STREET
    		STREET 2:		SUITE 3900
    		CITY:			HOUSTON
    		STATE:			TX
    		ZIP:			77002

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Harmony Merger Corp.
    		DATE OF NAME CHANGE:	20140703
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>next20220503_def14a.htm
    <DESCRIPTION>FORM DEF 14A
    <TEXT>
    Document 1 - file: next20220503_def14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>proxycardpage1.jpg
    <TEXT>
    Document 2 - file: proxycardpage1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>proxycardpage2.jpg
    <TEXT>
    Document 3 - file: proxycardpage2.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>