Outgoing administration adviser Elon Musk is criticizing Republicans’ signature policy bill to advance President Trump’s agenda as the he walks out the door, saying it moves too quickly to phase out Biden-era low-carbon energy tax credits.

Musk, in a social media post on X, retweeted a post from his company Tesla Energy that warns against “abruptly ending the energy tax credits.”

The post states: “We urge the senate to enact legislation with a sensible wind down” of credits for low-carbon electricity companies and homeowners who want to install residential green energy such as rooftop solar.

In a separate post, Musk notes “there is no change to tax incentives for oil & gas, just EV/solar” in the House-passed GOP bill, which faces calls from changes from multiple Republicans in the Senate.

The posts highlight fissures within the Republican Party on how to deal with the energy tax credits passed by Democrats in 2022.

A number of Republicans have called for a more deliberate phaseout that does not strand energy projects already in progress, but what ultimately passed the House was a significant chop to the credits that many in the industry describe as unworkable.

In particular, the final version states that projects can only get the credit if they begin construction within 60 days of the bill’s passage and begin producing electricity by 2028.

Trump has called for Republicans to unite behind the bill, but Musk has also criticized it before, in an interview with CBS News, for not codifying the broad government funding cuts enacted by his Department of Government Efficiency (DOGE).

“I was disappointed to see the massive spending bill, frankly, which increases the budget deficit, not just decreases it, and undermines the work that the DOGE team is doing,” he said.