The administration of President Donald Trump is preparing to revoke federal approval of Avangrid’s planned New England Wind project off the coast of Massachusetts, according to a court filing released on Wednesday.

Miniatures of windmill, solar panel and electric pole are seen in front of Iberdrola Renewables logo in this illustration taken January 17, 2023.

The filing marked the latest in a series of measures taken by U.S. authorities to halt offshore wind development. Last week, the administration announced it was reconsidering approval of SouthCoast Wind, another proposed project in Massachusetts. Recently, the Interior Department also issued a stop-work order for the Revolution Wind project near Rhode Island, which was already 80% complete.

According to the Department of Justice attorneys, the government intends to move by October 10 to vacate the U.S. Bureau of Ocean Energy Management’s approval of the construction and operations plan for New England Wind. The court filing was made in a lawsuit earlier this year in the U.S. District Court for the District of Columbia. The case was brought by local organizations and individuals opposing offshore wind, who claim the project’s approval violated federal environmental laws.

Avangrid, owned by Spanish energy company Iberdrola (IBE.MC), declined to comment on the development. Officials from Iberdrola also did not provide a statement.

New England Wind had received federal approval in 2024 under the administration of former President Joe Biden. The project site, about 30 miles (48 kilometers) south of Barnstable, Massachusetts, was divided into two lease areas, New England Wind 1 and New England Wind 2. Combined, the projects were expected to generate enough electricity to power approximately 900,000 homes.

Avangrid had stated last year that New England Wind 1 was scheduled to start construction in 2024 and begin operations in 2029. However, the current legal and regulatory actions have raised uncertainty over the project’s future.

Thomas Stavola Jr., an attorney for the plaintiffs in the case, ACK for Whales, a Nantucket-based group, said in a statement: “The federal agencies are now recognizing what Plaintiffs have long argued - that the project’s approvals are fatally flawed and violate numerous environmental statutes.”

The developments reflect broader challenges facing offshore wind in the U.S., which has encountered rising costs and supply chain constraints despite earlier policy support. The outcome of the legal and regulatory proceedings will determine whether New England Wind proceeds as planned or faces cancellation, adding further complexity to the future of offshore renewable projects in the region.