Background and Basis of Presentation	6 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background and Basis of Presentation	Note 1 — Background and Basis of Presentation NextDecade Corporation, a Delaware corporation, is a Houston-based energy company primarily engaged in construction and development activities related to the liquefaction of natural gas and sale of LNG. We are constructing and developing a natural gas liquefaction and export facility located in the Rio Grande Valley near Brownsville, Texas (the “Rio Grande LNG Facility”). Construction of Trains 1–3 (“Phase 1”) by Phase 1 LLC, Train 4 by Train 4 LLC, and Train 5 by Train 5 LLC commenced in July 2023, September 2025, and October 2025, respectively. We are also developing and advancing the permitting process for expansion Trains 6 through 8 at the Rio Grande LNG Facility. Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and with Rule 10-01 of Regulation S-X. Accordingly, they do not include all the information and disclosures required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2025. In our opinion, all adjustments which are necessary to a fair presentation of the unaudited consolidated financial statements have been included, and all such adjustments are of a normal recurring nature. The results of operations for the three and six months ended June 30, 2026 are not necessarily indicative of the operating results for the full year. Certain reclassifications have been made to prior period amounts to conform to the current presentation. The Company began presenting operating and maintenance expense, which primarily consists of costs associated with the Rio Grande LNG Facility and pre-operational readiness activities, as a separate line item on its Consolidated Statements of Operations. These reclassifications did not have a material effect on the Company’s financial position, results of operations, or cash flows.

NextDecade Corporation, a Delaware corporation, is a Houston-based energy company primarily engaged in construction and development activities related to the liquefaction of natural gas and sale of LNG. We are constructing and developing a natural gas liquefaction and export facility located in the Rio Grande Valley near Brownsville, Texas (the “Rio Grande LNG Facility”). Construction of Trains 1–3 (“Phase 1”) by Phase 1 LLC, Train 4 by Train 4 LLC, and Train 5 by Train 5 LLC commenced in July 2023, September 2025, and October 2025, respectively. We are also developing and advancing the permitting process for expansion Trains 6 through 8 at the Rio Grande LNG Facility.

The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and with Rule 10-01 of Regulation S-X. Accordingly, they do not include all the information and disclosures required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2025. In our opinion, all adjustments which are necessary to a fair presentation of the unaudited consolidated financial statements have been included, and all such adjustments are of a normal recurring nature. The results of operations for the three and six months ended June 30, 2026 are not necessarily indicative of the operating results for the full year.

Certain reclassifications have been made to prior period amounts to conform to the current presentation. The Company began presenting operating and maintenance expense, which primarily consists of costs associated with the Rio Grande LNG Facility and pre-operational readiness activities, as a separate line item on its Consolidated Statements of Operations. These reclassifications did not have a material effect on the Company’s financial position, results of operations, or cash flows.