Trump imposes tariffs on polysilicon, hitting solar panels and semiconductors from Dec. 4

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President Donald Trump on Thursday announced tariffs on polysilicon and its related products, in his administration’s latest attempt to eliminate China’s choke points in the global supply chain for solar panels and semiconductors.

But Trump’s directive won’t take effect until Dec. 4 — well after November’s midterm elections and a planned September summit between Trump and Chinese leader Xi Jinping — as the administration grapples with voters complaining of high prices and fragile trade negotiations with China.

“This will bring the supply chain here,” Commerce Secretary Howard Lutnick said of the order on Thursday alongside Trump at the White House. “We’ve got the industry here, it’s too small, and it’s going to explode.”

Because polysilicon is used in semiconductors and solar panels, it’s essential for military hardware and everyday electronics like cell phones and laptops, in addition to the world’s fastest-growing energy source.

The order imposes a 15 percent tariff on imported polysilicon and its derivatives, as well as minimum prices for imports of polysilicon, polysilicon ingots and wafers, solar cells and solar modules.

It also includes a clause intended to prevent companies from stockpiling those materials between now and December, authorizing Customs and Border Protection to restrict imports if it suspects an importer is attempting to dodge the higher duties.

Trump’s order is the result of a Commerce Department investigation launched last July into national security risks in the polysilicon supply chain, as part of a broader effort to shift supply chains away from China for multiple industries including wind turbines and robotics.

China has a near-monopoly on the production of polysilicon, according to S&P Global . But recent U.S. efforts to limit key areas of trade with China have already drawn a backlash from Beijing, which earlier this week implemented new controls on drone exports to the U.S.

The White House emphasized the order’s impact on domestic semiconductor production, a key focus as the U.S. looks to build out infrastructure related to artificial intelligence. Trump said the U.S. will “have a big percentage of the chip business by the time I leave office.”

But Thursday’s order may have a big impact on the solar industry, according to Jon Toomey, president of the pro-tariff Coalition for a Prosperous America organization.

“This proclamation delivers the most significant global trade protection action for the American polysilicon and solar industry in the modern era,” Toomey said in a statement. “For the first time, the United States is protecting the entire solar supply chain with a single action — and rewarding the manufacturers that build here — while taking a significant step to bolster the domestic semiconductor supply chain.”