This story has been updated.

Work on the nearly-completed Revolution Wind project was allowed to resume on Monday, after a federal judge ruled that the Trump administration had failed to justify its sudden decision last month to halt all offshore construction on the $6 billion project.

In particular, U.S. District Court Judge Royce Lamberth said that the government has yet to provide any new information to back up its claims that the project — which is more than 80% completed — poses a severe risk to national security.

Any potential impacts on national security were already reviewed as part of the project’s years-long permitting process, Lamberth said. Without any apparent basis with which to reverse its prior approvals, he said the government’s stop-work order represented “the height of arbitrary and capricious action.”

“If Revolution Wind cannot meet its deadlines, the entire enterprise could collapse,” said Lamberth, who was appointed to the U.S. District Court for the District of Columbia by President Ronald Reagan.

“There is no question in my mind of irreparable harm,” he added.

The Trump administration did not immediately say whether it plans to appeal the ruling. In a statement Monday, Department of the Interior spokeswoman Elizabeth Peace said the agency will continue to investigate any potential national security and other concerns as work resumes on the project.

“The Department of the Interior remains committed to ensuring that prior decisions are legally and factually sound,” Peace said.

Revolution Wind is being developed as part of a joint-partnership between the Danish energy company Ørsted and Skyborn Renewables, a division of Global Infrastructure Partners. Both developers sued the Trump administration earlier this month in an effort to lift the stop-work order, which officials said was costing the project up to $2.3 million per day.

Much of the work on Revolution Wind is taking place at the State Pier in New London, where workers are tasked with preparing pieces of the massive turbine shafts and propeller blades to be loaded onto specialized ships and carried out to the assembly area off the coast of Block Island.

[RELATED: As Revolution Wind stalls, CT clean energy workers are adrift]

Once completed, the project is expected to supply 704 megawatts of carbon-free power to the New England electric grid supported by power-purchase agreements with utilities in Connecticut and Rhode Island.

In a statement after the judge agreed to the developers’ request for a preliminary injunction, Revolution Wind spokeswoman Meaghan Wims said that work on the project will resume “as soon as possible.”

“Revolution Wind will continue to seek to work collaboratively with the US Administration and other stakeholders toward a prompt resolution,” of the underlying lawsuit, she said.

In addition to the lawsuit brought by the developers, Connecticut Attorney General William Tong and his counterpart in Rhode Island jointly sued the Trump administration over its decision to issue halt work on Revolution Wind. While that case remains pending in federal court in Providence, Tong issued a statement on Monday calling Lamberth’s ruling a “major win” for the the state.

“The Trump Administration should see the writing on the wall with this decision and drop its defense of their indefensible actions,” Tong said. “Every day that this project is stymied is a day of lost employment, another day of unaffordable energy costs, and another day burning fossil fuels when American-made clean energy is within reach.”

Kate Sinding Daly, senior vice president for law and policy at Conservation Law Foundation, said in a statement Monday, “The court’s decision restores momentum toward bringing clean, local power to New England, strengthening our energy security, and supporting thousands of jobs across the region. We applaud the court for upholding the rule of law and rejecting a reckless attempt to sabotage clean energy progress that will slash bills and toxic pollution.”

Lamberth’s ruling came at the start of a critical week for the project that has been stalled since Aug. 23. 

In an affidavit filed with the federal court in Washington D.C. earlier this month, Ørsted’s senior engineering, procurement, and construction director Paul Murphy said the developers have a tight window this year to make use of several specialized transportation and installation ships contracted to work on the project. Once those ships depart to work on other scheduled projects, he said, it could be years before they are available to return.

In addition, offshore weather conditions during the winter pose a “significant risk” to workers, making further delays more likely.

If work on the project does not resume by the end of September, Murphy said that Revolution Wind risked missing its deadline to begin supplying power by the end of 2026. That could result in the developers having to forgo “billions of dollars” of revenue through power-purchase agreements, and may force them to cancel the project altogether.

“Revolution Wind currently has no mechanism for extending those deadlines, and the [power-purchase agreements] would be subject to termination, significantly threatening the financial viability of the entire Project and posing an existential risk to the Project, and thus to Revolution Wind,” he said

Officials in Connecticut were quick to praise Monday’s ruling, with many noting the number of jobs tied to the project along with projections of lower electric costs once Revolution Wind begins producing power.

“The Trump Administration offered no credible facts — not a shred of evidence — to support a continued stop work order that deprives thousands of workers of jobs and Connecticut consumers of more affordable energy,” U.S. Sen. Richard Blumenthal, D-Conn., said in a statement. “None of the government’s trumped-up arguments have factual or legal weight. While I am pleased with today’s ruling, construction should be permanently permitted to go forward, and workers should be allowed back to the site. The Trump Administration’s irresponsible pandering to the fossil fuel industry cannot be permitted to persist in wasting taxpayer and consumer dollars.”

[RELATED: Blumenthal calls Trump decision to halt offshore wind project ‘insane’]

After the Bureau of Ocean Energy Management issued its stop-work order in August, Gov. Ned Lamont said he reached out to officials within the Trump administration in an attempt to negotiate a deal that would allow work on the project to resume.

When the federal government halted work on similar wind farm under development in Brooklyn this spring, Lamont noted, it was widely reported that New York Gov. Kathy Hochul agreed to relent on her state’s opposition to several gas pipeline projects in exchange for the Trump administration allowing the wind project to continue. (Hochul has denied to making such an explicit agreement.)

In his efforts to get a deal, however, Lamont said he was repeatedly met with silence from federal officials.

Speaking to reporters on Monday, Lamont expressed satisfaction with the judge’s decision to issue an injunction.

“I haven’t had a chance to follow up with Ørsted yet to see what the timing is, but it’s good news on behalf of the consumers and bringing down the price of electricity and honoring a contract with Ørsted that goes back to the first Trump administration,” Lamont said.

Reporter Mark Pazniokas contributed to this article.