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A Chinese worker inspects polysilicon at a Wuhan factory. Feature China/Future Publishing via Getty Images
The Trump administration is preparing to impose new tariffs and minimum import prices on polysilicon in a bid to prop up a domestic supply chain for the primary ingredient in semiconductors and solar panels. The decision, due out after the market closes today, will set a tariff of at least 15% on imported polysilicon and set baseline prices for each component in the supply chain, from the raw material derived from purified quartz to solar wafers, cells, and modules, sources familiar with talks told me, confirming broad details first reported by Reuters and Bloomberg. The Department of Commerce plans to delay implementation to allow domestic manufacturers that rely on imported components time to adjust, and provide offsets to companies that make major investments in the U.S. The policy will serve as a key lifeline to solar manufacturers, who lost one of their main incentives to buy made-in-America panels when the investment and production tax credits for solar effectively ended last month. But industry sources told me that the new trade restrictions would likely fall short of incentivizing new manufacturing, and would require more support on the demand side. The dynamic mirrors what my colleague Matthew Zeitlin called the “paradox of Trump’s critical mineral crusade,” whereby the administration pulled out all the stops to boost mining of rare earths and lithium while eliminating the landmark electric vehicle tax credit that ensured a domestic market for those metals.
It’s hardly the only protectionism the Commerce Department is attempting this month. On Thursday, the agency plans to publish a temporary final rule that would block exports of battery scraps and tungsten waste without a special waiver from the Bureau of Industry and Security. Producers of the materials, E&E News reported, would be required to sell in the U.S. for one year. The move comes a week after President Donald Trump signed a memo blocking exports of mineral-rich waste as the White House seeks to shore up supplies of metals for weapons production. Tungsten, as the Bloomberg “Odd Lots” podcast explained nicely in a recent episode, has a very high melting point, making it ideal for artillery and ammunition. While it’s typically in demand in low amounts during peace time, soaring interest is a sign of widening global conflicts.
For retail investors, Oklo emerged as the face of the small modular reactor industry in 2024 after the Silicon Valley nuclear darling debuted on the stock market. But the company hadn’t yet split atoms. Last night, the company’s low-power test reactor in Texas sustained a reaction for the first time. The milestone makes Oklo the fifth company in the Department of Energy’s Reactor Pilot Program to achieve criticality, but the first to do so on private land. Oklo boasted that the company had erected the facility at a previously undeveloped greenfield site in less than a year, demonstrating that “American nuclear deployment timelines can be measured in months rather than years,” the company said in a press release.
The move comes five months after the Nuclear Regulatory Commission, which notoriously rejected Oklo’s first attempt at gaining approval for its power plant reactors, approved the company’s plans to produce medical isotopes from low-powered reactors, as I exclusively reported in this newsletter at the time.
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Two House Democrats formally referred Secretary of Energy Chris Wright to the Department of Justice for potential prosecution, accusing him of lying to Congress when asked whether the agency canceled green grants for partisan reasons. In a letter published Wednesday in The Hill, Representatives Zoe Lofgren of California and Gabe Amo of Rhode Island, alleged that Wright lied when he testified his blocking of billions in climate spending had nothing to do with the money going to states that voted for Democrat Kamala Harris in the 2024 election. In a federal lawsuit related to the same award terminations, Energy Department lawyers admitted that “the inclusion of grants in the October notice tranche was based solely on the political identity of the grant recipient’s state” Wright previously testified that politics had no role in the decisions. “Secretary Wright lied to the Committee with his statements, which sought to prevent us from learning the truth: that the October award terminations were an act of political retaliation,” Lofgren and Amo wrote in the letter, addressed to acting Attorney General Todd Blanche. “In doing so, he violated 18 USC §1001, which bars individuals from making ‘any materially false, fictitious, or fraudulent statement or representation’ to Congress. We have no choice but to refer Secretary Wright to the Department of Justice for potential prosecution in this matter.”
In 1978, the U.S. used millions more tons of coal than today. Yet miners in Appalachia are facing rates of pneumoconiosis — the incurable, fatal disease known as black lung — at exactly the same levels today. That’s the finding of new data published Wednesday in the American Journal of Respiratory and Critical Care Medicine. Miners in Kentucky, Virginia, and West Virginia who had spent at least 25 years working underground had by far the worst rates, with one in three testing positive in X-rays conducted by the National Institute for Occupational Safety and Health, a federal agency. “I’m disgusted,” Scott Laney, a NIOSH research epidemiologist who is the lead author of the research letter, told NPR. “This is not going to get better because of all the disease that’s already in the pipeline. These guys are being treated like disposable widgets, not human beings. … We’re watching them die right before our eyes.”
Your humble correspondent is due for a series of flights this afternoon. I lose little sleep over my personal carbon footprint; I don’t find it a useful metric, and even if I did, I live in New York City, so my family’s life in dense housing and reliance on public transit already places me well below most Americans. But I can’t help but think of it when I’m riding multiple planes in one day. Which makes this new Bloomberg feature so exciting. In Brazil’s Minas Gerais state, more than 200 researchers are working to commercialize jet fuel made from the oil-rich fruit of the macauba palm tree. Across 356,000 acres, the Abu Dhabi-based biofuels producer Acelen Renováveis plans to start processing macauba oil as part of a $3 billion project. The effort is meant to help the push to reduce airlines’ carbon intensity, but — as with biofuels in general — it’s worth considering the climate benefits with healthy doses of skepticism until detailed analyses come out.
