Tariffs on solar wafers, polysilicon, and certain tungsten products from China are going to rise dramatically come January 1st, 2025, the Biden administration announced Wednesday. That means higher price tags on key materials needed to make solar panels at a time when solar is the fastest growing source of electricity in the US.

Polysilicon is used to make solar wafers, which are the semiconductors in solar panels. Tungsten — the same material in old-school incandescent lightbulbs — has many uses in electronics because of its high melting point. The metal is also part of supply chains for the aerospace, automotive, defense, medical, and oil and gas industries.

It’s the latest instance of the Biden administration hiking up tariffs on goods from China — which dominates solar manufacturing — as part of its plan to build up domestic supply chains for clean energy.

“The tariff increases announced today will further blunt the harmful policies and practices by the People’s Republic of China,” ambassador Katherine Tai said in a statement. “These actions will complement the domestic investments made under the Biden-Harris Administration to promote a clean energy economy, while increasing the resilience of critical supply chains.”

American manufacturers welcomed the changes. “These trade measures will begin to counter the pervasive Chinese government subsidies in solar manufacturing. It is a step in the right direction,” Mike Carr, executive director of the Solar Energy Manufacturers for America (SEMA) Coalition, said in an emailed statement.

President-elect Donald Trump has said he plans to hike tariffs on imported goods from China even more than his predecessor, which is expected to increase prices on everything from cars to electronics.