POWER OF ATTORNEY FOR SECTION 16 REPORTING OBLIGATIONS KNOW ALL BY THESE PRESENTS, that the undersigned, Arnaud Lenail-Chouteau, hereby makes, constitutes and appoints each of Matthew Schatzman, Chief Executive Officer, Brent Wahl, Chief Financial Officer, and Vera de Gyarfas, General Counsel, of NextDecade Corporation, a Delaware corporation, or any successor thereto (the "Company"), as the undersigned's true and lawful attorney-in-fact, with full power and authority as hereinafter described on behalf of and in the name, place and stead of the undersigned to: 1) prepare, execute in the undersigned's name and on the undersigned's behalf and submit to the U.S. Securities and Exchange Commission (the "SEC") a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the Securities Exchange Act of 1934 (as amended, the "Exchange Act") or any rule or regulation thereunder; 2) prepare, execute, acknowledge, deliver and file Forms 3, 4, and 5 (including any amendments thereto) with respect to the securities of the Company, with the SEC, any national securities exchange and the Company, as considered necessary or advisable under Section 16(a) of the Exchange Act of 1934 and the rules and regulations promulgated thereunder; 3) seek or obtain, as the undersigned's representative and on the undersigned's behalf, information of transactions in the Company's securities from any third party, including brokers, employee benefit plan administrators and trustees, and the undersigned hereby authorizes any such person to release any such information to the undersigned and approves and ratifies any such release of information; and 4) perform any and all other acts which in the discretion of such attorneys-in-fact are necessary or desirable for and on behalf of the undersigned in connection with the foregoing. The undersigned acknowledges that: 1) this Power of Attorney authorizes, but does not require, such attorneys-in-fact to act in their discretion on information provided to such attorney-in-fact without independent verification of such information; 2) any documents prepared and/or executed by such attorneys-in-fact on behalf of the undersigned pursuant to this Power of Attorney will be in such form and will contain such information and disclosure as such attorneys-in-fact, in his or her discretion, deems necessary or desirable; 3) this Power of Attorney does not relieve the undersigned from responsibility for compliance with the undersigned's obligations under the Exchange Act, including without limitation the reporting requirements under Section 16 of the Exchange Act; and

4) neither the Company nor such attorneys-in-fact assumes any liability for the undersigned's responsibility or failure to comply with the requirements of the Exchange Act, including without limitation for profit disgorgement under Section 16(b) of the Exchange Act. The undersigned hereby ratifies all that such attorneys-in-fact, for and on behalf of the undersigned, shall lawfully do or cause to be done by virtue of this Power of Attorney. This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact. IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17th day of October, 2024. By: ______/s/ Arnaud Lenail-Chouteau_____________________ Arnaud Lenail-Chouteau