Aug 6 (Reuters) - A U.S. court has overturned the

Federal Energy Regulatory Commission's (FERC) authorization for

NextDecade's ( NEXT ) Rio Grande LNG project for not issuing a

supplemental environmental impact statement, the company said on

Tuesday.

The facility has been in development for several years,

suffering repeated delays, and phase 1 is now expected to reach

completion by early 2029 at an expected cost of about $18

billion.

NextDecade ( NEXT ) said it was "disappointed in the court's decision

and disagrees with its conclusions."

"At this time, construction continues on the first three

liquefaction trains and related infrastructure (Phase 1)" the

company said, adding it "is evaluating the impact of the court's

decision on the timing of a positive final investment decision

(FID) on Train 4".

Earlier this year, Abu Dhabi National Oil Company (ADNOC)

acquired an 11.7% stake in phase 1 of the project and NextDecade ( NEXT )

signed a non-binding agreement with Saudi Aramco to

supply 1.2 million tonnes per annum (MTPA) of LNG for 20 years.

NextDecade ( NEXT ) was planning to start the construction of the

fourth liquefaction train in the second half of 2024 after the

FID.

(Reporting by Tanay Dhumal in Bengaluru; Editing by Anil

D'Silva)