Danish wind power giant Ørsted is suing the the Trump administration for its order to halt work on the nearly completed Revolution Wind project off the coast of New England.

Ørsted and its joint venture partner Skyborn Renewables filed a complaint in the U.S. District Court for the District of Columbia on Thursday seeking to vacate the stop-work order from Trump’s Interior Department, arguing that the administration lacked the legal authority for the decision.

“The Project has spent billions of dollars in reliance on these valid approvals,” the filing said. “The Stop Work Order is invalid and must be set aside because it was issued without statutory authority, in violation of agency regulations and procedures and the Fifth Amendment’s Due Process Clause, and is arbitrary and capricious.”

The stop-work order was among several actions taken under President Donald Trump — a longtime wind critic — to impede development of the nascent U.S. offshore wind industry. Since the stop-work order, his administration has withdrawn grants for offshore wind-related infrastructure projects and signaled in legal proceedings that it intends to revoke permits for numerous projects approved under former President Joe Biden.

The Interior Department last month ordered the halt to construction of the massive Revolution Wind project off the coasts of Rhode Island and Connecticut until the Bureau of Ocean Energy Management could assess the national security risks and concern about its interference with reasonable uses of the surrounding waters.

State and federal officials, labor unions and clean energy advocates have pounced on the decision, arguing it will have a chilling effect on investments across the country while also costing the region some 1,000 union jobs. ISO New England, the region’s power grid operator, also warned that delaying the project “will increase risks” to reliability.

The filing from the Revolution Wind project on Thursday noted that the Defense Department had previously cleared the project to proceed.

Revolution Wind — which is 80 percent complete — received federal and state permits in 2023 and had been expected to begin operations next year. Its 65 turbines would have a production capacity of 704 megawatts, which could provide clean energy to power more than 350,000 homes in Connecticut and Rhode Island.

The filing said that if unabated, the stop-work order “will inflict devastating and irreparable harm” on Revolution Wind, which has already spent or committed about $5 billion on the project and will incur more than $1 billion in costs if the project is canceled.

A person close to the decision to sue the administration said Thursday that the “important” legal step is part of a multitrack approach, but noted that conversations with stakeholders, including at state and federal levels, continue to seek a resolution.

The Interior Department said Thursday that it does not have comment on litigation. The White House did not immediately respond to a request for comment.