US solar inventories jump 126% ahead of Section 232 tariff

US solar equipment inventories grew 126% in the second quarter of 2026, before the Section 232 tariffs and minimum prices take effect on December 4, pv magazine USA reported on November 6.

The August 2026 proclamation set import floor prices of 21 dollars per kilogram of polysilicon, 100 per kilogram of ingots and wafers, 0.22 per watt on cells and 0.38 per watt on modules, plus a 15% tariff on derivatives, according to Canary Media. The relief covers companies that commit polysilicon, ingot, wafer or cell plants in the United States with construction before January 20, 2029; module assembly alone does not qualify, according to Wood Mackenzie. The measure is global: it reaches modules entering the United States regardless of the country of assembly.

Wood Mackenzie estimates the floor will push utility-scale modules above 0.40 dollars per watt, near the 2022 peak, with increases of 11% in commercial and industrial systems and 20% in utility-scale projects. Analyst Elissa Pierce notes that the full impact will not arrive until 2027, because suppliers will work first through the stockpiled inventory. Wood Mackenzie counts 6.4 GW of integrated cell and module capacity in operation in the United States; no local manufacturer yet has enough cells for its own demand. Canary Media puts operating cell capacity at 10.6 GW, based on data from the US solar industry association (SEIA).

On the operational side, pv magazine USA reports that Customs and Border Protection (CBP) and the Department of Commerce have not yet published self-certification instructions. Sabah Bayatli, chief executive of OCI Energy, described change-in-law clauses to split risk among sponsors, suppliers and offtakers, and the pass-through of unforeseen costs into PPA (power purchase agreement) prices. Projects under construction are covered by prior contracts; the exposure is concentrated in the 2027-and-beyond pipeline.

For Mexico and the rest of the region, integrated into that supply chain, the 0.38 dollars per watt floor becomes the price reference and puts pressure on project capital investment.

What to watch: the CBP and Commerce guidance before December 4 and the first module quotes for 2027 deliveries.

This article was drafted with artificial intelligence assistance from verified sources and reviewed by a human editor before publication.