EXHIBIT 29

JOINT FILING AGREEMENT

This will confirm the agreement by and among all the undersigned that the Schedule 13D filed on or about this date and any amendments thereto with respect to the beneficial ownership by the undersigned of shares of common stock, $0.0001 par value per share, of NextDecade Corporation is being filed on behalf of each of the undersigned in accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934.  This agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.  The execution and filing of this agreement shall not be construed as an admission that the undersigned are a group, or have agreed to act as a group.

Dated:  March 19, 2021	Halcyon Mount Bonnell Fund LP
	By: Bardin Hill Investment Partners LP, its Manager
	/s/ Suzanne McDermott	/s/ John Freese
	Name: Suzanne McDermott	Name: John Freese
	Title: Chief Compliance Officer	Title: General Counsel
	March 19, 2021	March 19, 2021
	Date	Date
	Bardin Hill Fund GP LLC
	/s/ Suzanne McDermott	/s/ John Freese
	Name: Suzanne McDermott	Name: John Freese
	Title: Chief Compliance Officer	Title: General Counsel
	March 19, 2021	March 19, 2021
	Date	Date
	HCN LP
	By: Bardin Hill Investment Partners LP, its Manager
	/s/ Suzanne McDermott	/s/ John Freese
	Name: Suzanne McDermott	Name: John Freese
	Title: Chief Compliance Officer	Title: General Counsel
	March 19, 2021	March 19, 2021
	Date	Date

1

HCN GP LLC
/s/ Suzanne McDermott	/s/ John Freese
Name: Suzanne McDermott	Name: John Freese
Title: Chief Compliance Officer	Title: General Counsel
March 19, 2021	March 19, 2021
Date	Date
Halcyon Energy, Power and Infrastructure Capital Holdings LLC
By: Bardin Hill Investment Partners LP, its Manager
/s/ Suzanne McDermott	/s/ John Freese
Name: Suzanne McDermott	Name: John Freese
Title: Chief Compliance Officer	Title: General Counsel
March 19, 2021	March 19, 2021
Date	Date
First Series of HDML Fund I LLC
By: Bardin Hill Investment Partners LP, its Manager
/s/ Suzanne McDermott	/s/ John Freese
Name: Suzanne McDermott	Name: John Freese
Title: Chief Compliance Officer	Title: General Counsel
March 19, 2021	March 19, 2021
Date	Date
Bardin Hill Event-Driven Master Fund LP
By: Bardin Hill Fund GP LLC, its General Partner
/s/ Suzanne McDermott	/s/ John Freese
Name: Suzanne McDermott	Name: John Freese
Title: Chief Compliance Officer	Title: General Counsel
March 19, 2021	March 19, 2021
Date	Date
Bardin Hill Investment Partners LP
/s/ Suzanne McDermott	/s/ John Freese
Name: Suzanne McDermott	Name: John Freese
Title: Chief Compliance Officer	Title: General Counsel
March 19, 2021	March 19, 2021
Date	Date

2

/s/ Avinash Kripalani
Name:	Avinash Kripalani
March 19, 2021
Date
/s/ Jason Dillow
Name:	Jason Dillow
March 19, 2021
Date
/s/ Kevah Konner
Name:	Kevah Konner
March 19, 2021
Date
/s/ John Greene
Name:	John Greene
March 19, 2021
Date
/s/ Pratik Desai
Name:	Pratik Desai
March 19, 2021
Date

3