Article
Author: Solarplaza
What US solar's new trade regime means before the 4 December deadline
US trade policy on solar just tightened considerably. Federal agencies have combined import price floors with national security equipment bans, moving well past the tariffs the industry has dealt with for years. The manufacturing buildout behind these rules has been underway since 2024, but the regulatory timeline has compressed fast: two major actions landed within six weeks of each other. For asset owners, investors, and equipment providers, the question now is practical: what changes before the compliance dates hit, and what can wait.
Key takeaways
What is happening?
Trade policy: two actions, six weeks apart
On 28 July 2026, the FCC's Public Safety and Homeland Security Bureau added foreign-produced power inverters to its Covered List via notice DA-26-786. This blocks new foreign inverter models from receiving the equipment authorization required to import, market, or sell them in the US, effective immediately. A few details matter more than the headline:
 
On 6 August 2026, a separate Section 232 proclamation established a minimum import price (MIP) program across the solar value chain: $21/kg on polysilicon, $100/kg on ingots and wafers, $0.22/W on cells, and $0.38/W on modules. An additional 15% ad valorem tariff applies on top of the MIP for ingots, wafers, cells, and modules, though not for raw polysilicon (Shanghai Metals Market). Treaty partners (Japan, South Korea, Taiwan, Switzerland, Liechtenstein, and the EU) get a capped combined rate that keeps their total duty at 15%; the UK gets a flat 10% (PowerInfoToday).
None of this is in effect yet, though. The measures apply to goods entered for consumption on or after 4 December 2026, 120 days after signing (pv magazine USA). For procurement teams, that window matters most: contracts settled before that date, at current pricing, sidestep the floor entirely.
Manufacturing: a buildout already in motion
Most of the manufacturing capacity additions in this story predate the July-August policy actions by months or years. The trade measures are accelerating a trend already in motion, not starting one.
Power electronics. Enphase has continued expanding US contract manufacturing across Texas and South Carolina; the company reported shipping 1.58 million microinverters and battery inverters from those facilities in Q2 2026 (Enphase Q2 2026 results). SolarEdge has been producing inverters and power optimizers domestically at facilities in Austin, Texas, and Tampa, Florida, since 2024 (SolarEdge/Flex milestone announcement), positioning both companies to qualify products for the FCC's domestic-content exemption.
Panels and cells. The biggest headline here is Tesla's filing for a proposed $10.1 billion vertically integrated solar cell facility in Fort Bend County, Texas, under the internal name "Project Crystal Sun." The plant surfaced publicly in early August via a Texas tax-incentive (JETI) application (Electrek; pv magazine). It would process polysilicon through to finished modules under one roof, a rare degree of vertical integration for a US facility, and a step toward Tesla's stated goal of 100 GW of annual domestic solar manufacturing. It isn't a committed project, though: Tesla is weighing the site against an out-of-state alternative and has said it may build elsewhere if the tax incentive isn't approved (Teslarati). If it goes ahead, commercial production wouldn't start before Q1 2029.
Elsewhere, Canadian Solar's US subsidiary CS PowerTech opened Phase I of a roughly $1 billion HJT solar cell facility in Jeffersonville, Indiana, on 24 July, targeting more than 6 GW of annual capacity once fully built out and supplying the company's Mesquite, Texas module plant (PV Tech; pv magazine USA). In Houston, SEG Solar brought a $200 million, 4 GW expansion toward commercial operation, lifting its total US module capacity to roughly 6 GW (pv magazine USA; Electrek). In Georgia, Qcells began cell production at its $2.5 billion Cartersville complex on 9 June, targeting 3.3 GW each of ingots, wafers, and cells alongside 3.5 GW of module capacity by Q3 2026, the first US site aiming to produce every major module component under one roof (Qcells press release; PV Tech). Upstream, Hemlock Semiconductor and Corning brought a Michigan ingot-and-wafer plant online in late 2025, targeting roughly one million wafers a day, or about 2 GW annually. That marks the return of domestic wafer production after nearly a decade (PV Tech).
Storage. LG Energy Solution's Holland, Michigan facility, producing LFP cells for grid storage, reached roughly 17 GWh of capacity by late 2025 and is targeting 30 GWh by the end of 2026 (Energy-Storage.News; Industrial Info Resources). Form Energy has been expanding its Weirton, West Virginia iron-air battery plant since breaking ground in October 2024, aiming for over 500 MW of annual capacity by 2028 (Form Energy; Boston Globe).
One reversal worth flagging: KORE Power's planned 6 GWh KOREPlex battery facility in Buckeye, Arizona was canceled in February 2025. The company halted the project, put the site up for sale, and its CEO stepped down (Energy-Storage.News; Renewable Energy World). It's not part of the current domestic buildout, despite still appearing in older coverage.
What does it mean?
US trade policy has moved from financial friction to structural isolation. For years, overseas suppliers absorbed tariffs by shifting final assembly across Southeast Asia. The current approach closes that route by combining national security controls with origin-based content rules that follow where a product is actually built, not who builds it.
The FCC's move targets the digital layer of the grid. Because modern inverters depend on firmware updates and continuous connectivity, regulators are treating them as a critical infrastructure risk. Existing approved models keep working, but the freeze on new authorizations locks out product refreshes from manufacturers that haven't localized assembly, regardless of nationality.
At the panel level, the Section 232 floors are designed to make underpriced imports uncompetitive once they take effect in December. Before that date, developers still have a pricing window; after it closes, low-cost imports lose their edge, and manufacturers gain a durable floor under domestic pricing.
Thin-film manufacturers like First Solar stand to gain the most from this structurally. Their CdTe modules fall outside the HTS codes the MIP program covers, so they benefit from the price floor without being subject to it (Anza).
How does it impact your business?
For buyers (asset owners, investors, and asset managers)
 
For sellers (equipment providers, O&M providers, and software vendors)
Sources
Trade policy
 
Manufacturing
This article was created in preparation for Solarplaza Summit Asset Management North America. Be the first to know when the new edition will be held by signing up for updates.
Copyright © 2026 Solarplaza International
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