The federal government has signed new tariffs on polysilicon and the products made from it, including solar wafers, cells, and modules. For commercial property owners with a solar project on the horizon, there is now a firm deadline driving the timing of your next move.
What is happening
In July 2025, the U.S. Department of Commerce opened a Section 232 national security investigation into imports of polysilicon and its derivative products.1 Section 232 is the same trade authority that has already produced tariffs on steel, aluminum, and semiconductors. It gives the federal government broad power to restrict imports it determines are a threat to national security, and unlike some trade actions, it does not require proof of unfair pricing.
That investigation is now complete. On August 6, 2026, the president signed a proclamation establishing minimum import prices for polysilicon and its derivatives, alongside a 15 percent tariff that applies to every imported polysilicon, wafer, cell, and finished panel regardless of country of origin. The minimum import prices are set at $21 per kilogram for polysilicon, $100 per kilogram for ingots and wafers, $0.22 per watt for solar cells, and $0.38 per watt for finished modules. Products priced below those floors will be blocked from entering the U.S. market. These trade protections take effect on December 4, 2026.2
This comes on the heels of another policy shift. The Section 201 safeguard tariffs that had applied to most imported solar panels since 2018 expired on February 6, 2026, after reaching their eight-year statutory limit.3 That left a gap in trade protection that this new Section 232 action now fills, this time with a broader, more permanent structure.
Why This Stacks on Top of Existing Pressure
Commercial buyers who assumed shifting to suppliers in Southeast Asia would sidestep tariff exposure should take note. A separate antidumping and countervailing duty case decided earlier this year found preliminary combined duty rates of approximately 139 percent for Indonesia, 103 percent for Laos, and 234 percent for India.4 The new Section 232 tariff applies on top of that, and it applies globally, regardless of country of origin. There is no lower-tariff country left to source around.7
Industry analysts are not projecting relief anytime soon. Intertek CEA forecasts module prices will keep rising through 2027. Most planned U.S. cell and wafer manufacturing capacity is not expected to reach meaningful scale until late 2026 at the earliest, and analysts generally do not expect real price competition from domestic supply until 2028.5
The proclamation also includes an anti-stockpiling provision. It authorizes Customs and Border Protection to restrict imports if it suspects an importer is attempting to build up inventory now specifically to dodge the December tariffs, so this is not a matter of simply front-loading a warehouse full of panels before the deadline.6
What This Means for Your Project
December 4, 2026 is now a hard line. Projects that complete procurement and installation before that date avoid these new costs entirely. Projects still sourcing equipment after that date will pay against the new price floors and the 15 percent tariff on every component in the supply chain, from raw polysilicon through the finished panel.
This also coincides with an unrelated but equally firm deadline. Commercial projects now have only until December 31, 2027 to be placed in service to qualify for current investment tax credits and bonuses under the One Big Beautiful Bill Act. Between rising equipment costs starting in December and a fixed placed-in-service deadline the following year, the case for moving now is coming from two directions at once.
There is one piece of good news buried in this. Projects using domestic content, including panels and components that meet FEOC compliance requirements, are positioned to be less exposed to these import-driven cost increases and may also qualify for the Domestic Content Bonus, which can add meaningfully to your total incentive stack.
What to Do Now
With a confirmed effective date of December 4, 2026, the window to secure current equipment pricing and lock in your place in the installation queue has a clear countdown attached to it. Solar Energy Solutions is helping commercial clients across the Midwest, Southeast, and Mid-Atlantic evaluate their exposure and move projects forward before these tariffs land.
If you have a commercial solar project under consideration, now is the time to talk with our team about locking in pricing and timeline.
Sources
1 Anza Renewables, “Mitigating Solar & Storage Tariff, Trade, & Supply Chain Risk,” January 22, 2026.
2 Reuters, “Trump Unveils Trade Actions to Protect Key Solar and Semiconductor Material,” republished by GV Wire, August 6, 2026.
3 Solar Power World, “End of an Era: Sec. 201 Tariffs on Imported Solar Panels Expire,” February 9, 2026.
4 Coalition for a Prosperous America, “Solar Trade Case Preliminary Duties Underscore Need for Full Supply Chain Action in Polysilicon 232,” April 24, 2026.
5 pv magazine USA, “Intertek CEA Forecasts Rising U.S. Solar Module Prices Through 2027 Amid Tariff Uncertainty,” March 16, 2026.
6 Associated Press, “Trump Announces Tariffs on Key Component for Solar Panels and Semiconductors,” republished by Yahoo Finance, August 6, 2026.
7 Solar Power World, “Sec. 232 Polysilicon Results: The Price of All Imported Solar Panels Is Going Up,” August 6, 2026.
