Commerce is watching polysilicon imports to stop stockpiling

Solar panel prices are set to change later this year because of a new federal tariff. Starting December 4, 2026, imported solar panels and their components (wafers, cells, and polysilicon, the raw material used to make solar cells) will face a 15% tariff, along with minimum prices set at each stage of manufacturing. The Trump administration ordered the tariffs, citing national security concerns about relying on foreign-made polysilicon.

In the meantime, the Commerce Department is watching for companies trying to stockpile cheap imported solar products before the tariff kicks in. It is comparing recent import volumes to each importer's historical averages and has set strict weekly limits for new importers with no track record, covering everything from raw polysilicon to finished panels. Importers who exceed these limits without approval will be blocked from bringing in more product until the tariff takes effect.

Some domestic panel manufacturers support the crackdown, saying it stops foreign companies from flooding the market to dodge new trade rules. Others in the solar industry have mixed views on the tariffs themselves.

For homeowners, the practical takeaway is that solar panel prices could rise once the tariff and minimum pricing rules start in December. If you are considering solar for your home, panels bought or installed before that date may be cheaper than those installed afterward, though the exact price impact isn't yet clear.