A group led by the Sierra Club has filed federal lawsuits challenging FERC’s decision earlier this year to reaffirm its approval of the Rio Grande and Texas LNG export projects as they continue a fight to stop the proposed facilities from advancing.

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The environmental group was joined by the city of Port Isabel and the Carrizo Comecrudo Tribe of Texas in filing the lawsuits against the projects and an associated pipeline in the U.S. Court of Appeals for the District of Columbia Circuit. The group argues that the Federal Energy Regulatory Commission reaffirmed its approval for the projects “without adequately addressing the deficiencies identified by the court” in its initial order two years ago. 

FERC reaffirmed its 2019 approvals for the projects in April, eliminating a...