Approving Willow would be just the latest shift by Biden toward the political center as he moves toward a potential reelection bid. He similarly dismayed liberals last week by saying he would not veto a GOP-led repeal of changes to D.C.’s criminal code.

Environmental groups acknowledged Saturday that they were largely in the dark about the White House’s plans, but said they believed that the current discussions inside the administration were largely over whether to limit the number of drilling sites at the Willow project to two rather than three. Conoco had proposed building five well pads.

“It sounds like different groups in the White House are still discussing” the potential size of the project, said one environmental advocate who had been in contact with the administration late Friday.

“They told us they had nothing to offer” on the state of project deliberations, added the person, who was granted anonymity to describe internal White House deliberations.

But if the reports of the approval are true, Biden’s shift to the center on oil would threaten to demoralize the climate activists he needs to support him in 2024, said Jamal Raad, co-founder and senior adviser of the group Evergreen Action.

“It will be harder for us and climate activists to rally around this president come next year,” Raad said, explaining the action would detract from his many accomplishments, such as the $370 billion in climate and clean energy incentives in the Inflation Reduction Act, while putting the onus on Biden to issue tougher environmental rules on cars and power plants.

Conoco declined to comment until it hears a decision directly from the administration.

Conoco Chief Executive Ryan Lance last week urged the administration to approve Willow, saying the project was in line with the Biden administration’s recent exhortations to the industry to increase oil production to help batten down prices.

“This is exactly what this administration has been asking our industry to do over the last couple of years,” Lance told an energy conference in Houston.

Regardless of the size, any plan would call for drilling oil and building miles of pipelines and roads, a gravel pit, an air strip and other infrastructure in the National Petroleum Reserve-Alaska, a 36,875-square-mile patch of federal land in the relatively undeveloped Arctic wilderness. It would produce as much as 600,000 barrels of oil over its three-decade lifetime.

The project would also add nearly 280 million tons of greenhouse gas into the atmosphere over that period, according to the Interior Department’s environmental analysis. That would be the equivalent of adding two new coal-fired power plants to the U.S. electricity system every year, according to the Environmental Protection Agency’s emissions calculator.

The National Petroleum Reserve-Alaska, originally set aside by the Harding administration for potential oil drilling in 1923, is outside the Arctic National Wildlife Refuge, another swath of northern Alaska that Biden has declared off-limits for oil development.

Environmentalists said they were still holding onto hope based on the administration’s denial that it made a final decision to OK the project, despite multiple news reports saying that an announcement of the approval would be made in the coming days. (Bloomberg News first reported Friday night that the administration had decided to greenlight it.)

“Great! Then there is still time to turn this all around!!!” Natural Resources Defense Council spokesperson Anne Hawke posted on Twitter after White House press secretary Karine Jean-Pierre denied on Friday that a final decision had been made.

Hawke also reached out to Swedish climate activist Greta Thunberg for help persuading Biden, tweeting at the young advocate: “In just days, the US will approve a massive oil project in Alaska. Can you help us tell US @POTUS to #StopWillowProject?”

Sen. Ed Markey (D-Mass.), a longtime climate advocate, expressed dismay at the news.

“We cannot allow the Willow Project to move forward,” he tweeted late Friday. “We must build a clean energy future — not return to a dark, fossil-fueled past.”

An approval, if it comes, would infuriate environmental groups and continue a year-long strengthening of the administration’s relationship with the oil industry. But it would also come as market analysts are forecasting that oil prices will remain volatile for the next several years, which would make killing the project politically tricky.

Biden himself has softened his rhetoric on transitioning the country away from fossil fuels, and he has repeatedly pressed the oil and gas industry to increase production in the short term to keep prices lower.

“We are still going to need oil and gas for a while.” he said during his State of the Union speech last month.

The Willow development is the rare large-scale oil project to be announced in recent years in the United States, where the industry has instead shifted its focus to drilling smaller, cheaper and faster projects using fracking to tap into shale fields in the Southwest. If approved, construction could start soon, and additional construction in Alaska’s North Slope for Willow will occur throughout the summer and fall, the company has said.

Alaskan native tribes have expressed split opinions on the project, with some warning it would degrade their environment and others welcoming its potential economic gains.

“The Willow Project is a new opportunity to ensure a viable future for our communities, creating generational economic stability for our people and advancing our self-determination,” said Nagruk Harcharek, president of the nonprofit Voice of Arctic Iñupiat, in a statement Saturday. “North Slope Iñupiat communities have waited nearly a generation for Willow to advance.”