The Trump Administration’s Section 232 tariff regime for polysilicon takes effect December 4, 2026, setting new minimum import prices on solar modules, cells, wafers, and polysilicon. Most coverage has focused on how far import prices will rise. Less has gone to the domestic content math, and for developers pursuing the 10% ITC domestic content adder, the news is better than the headlines suggest: the premium for domestic modules has shrunk.
That keeps blending (buying only the domestic module points a project needs and filling the rest with imported modules) the lowest-cost path to the adder on most projects, before and after December 4. Below, we break down how the premium has moved, how racking, inverters, and safe-harbor year determine how much your modules need to contribute, and why the real constraint is securing the supply a blend depends on. Now is the time to find module options before December 4. If you wait, or can’t secure supply now, expect pricing (and your options) to tighten significantly.
Section 232 Polysilicon Raised Prices, But the Domestic Content Premium Shrank
The Section 232 tariff raised the floor on every category of solar module, but it didn’t break the math behind the domestic content bonus:
- Before the proclamation, imports ran roughly 27 cents a watt and Domestic Cell modules roughly 47 cents, a premium of about 20 cents.
- As of October 5, pricing for delivery after December 4 puts imports at the 38-cent floor and Domestic Cell modules around 50 cents, narrowing the premium to about 12 cents.
- Domestic Lite modules sit around 40 cents, a premium of about 2 cents, down from roughly 7 cents in mid-June. Domestic Lite uses imported cells plus at least one qualifying U.S.-made component, such as the frame, glass, backsheet, or encapsulant. U.S. assembly alone earns no points.
With premiums that low, it makes sense to blend imported and domestic modules wherever possible. In almost every combination modeled in Anza’s post-Section 232 domestic content blending calculator, blending beats paying the domestic premium on every watt. On post-December 4 pricing, the 10% bonus still nets roughly 18 to 35 cents a watt of project value after the module premium, depending on system type and safe-harbor year. On a single-axis tracker safe-harbored in 2026, for example, blending nets about 23.3 cents a watt of value versus 18 cents for an all-Domestic Cell buy: 5.3 cents more valuable for clearing the same threshold.
How Blending Works: Racking, Inverters and Safe-Harbor Year Set the Gap Modules Have to Close
First, a quick refresher. The 10% domestic content bonus sits on top of the base ITC, and projects can still earn it if placed in service by the end of 2027 (or 2029 for projects that began construction or safe-harbored before July 4, 2026). To qualify, a project’s U.S.-made components, including modules, racking, and inverters, must reach a minimum domestic content requirement percentage set by the year construction begins. Projects must also meet the adder’s other requirements, including steel and iron sourcing and prevailing wage. For a fuller primer on how points are counted, see our earlier guide to blending your way to the 10% ITC adder.
Modules get the attention, but on most system types they don’t decide whether a project clears the threshold. Racking, inverters, and the year a project safe-harbors set the range a developer is working within long before a single module quote comes back. For example, on a standard tracker project, domestic racking typically contributes about 28.7 points before you count contributions from a single module. Modules only have to close the remaining gap, and closing the gap doesn’t have to mean using Domestic Cells. A blend can pair Domestic Cell modules with imports, or Domestic Lite modules with imports, whichever clears the threshold at the lowest cost.
At one end, an MLPE system safe-harbored in 2024 clears its threshold on domestic racking and inverter points alone. It needs no domestic modules at all and keeps roughly 35 cents a watt of bonus value.
Fixed tilt sits at the opposite end. With no racking or inverter points to lean on, modules make up more than 90% of a fixed-tilt project’s qualifying domestic content, so the module buy decides nearly everything. Blending still adds value through 2026, but the margin narrows each year. A fixed-tilt system safe-harbored in 2027 or later, at a 55-point threshold, cannot get there through modules at any price. It needs domestic balance-of-system components regardless of what a module costs.
Single-axis trackers and string systems fall between those poles, and where a given project lands depends as much on its safe-harbor year as on its racking or inverter choice. That’s because the threshold itself moves: 40 points in 2024, 45 in 2025, 50 in 2026, and 55 from 2027 on, rising five points every year. On a single-axis tracker, Anza’s model shows blended bonus value slipping from about 23.3 cents/watt with a 2026 safe harbor to 21.7 cents/watt with a 2027 safe harbor, because the higher bar means buying a bigger share of domestic modules and paying the premium on more of the project. Waiting a year to start construction doesn’t just risk losing supply. It raises the bar you have to clear.
Secure Modules Now, While You Can
If blending still works after December 4, why the urgency? Because availability changes. Suppliers are repricing ahead of the deadline, and the domestic and imported modules a blend needs are selling out. A lowest-cost mix only works if that supply is still available when you need it.
Domestic supply is running out first. Domestic manufacturing was already the tightest link in the supply chain before August 6, and announced capacity keeps slipping. One prominent domestic cell supplier says its 2027 domestic content is sold out, and only two TOPCon domestic cell manufacturers remain, one of which isn’t set up for large projects. As of October 5, suppliers on Anza’s platform list up to about 30 GW of domestic cell modules as available from Q4 2026 through 2028. Little of it is near term: about 0.5 GW for Q4 2026 delivery and about 12 GW for 2027, with the rest in 2028.
Imported supply is tightening too. New anti-stockpiling rules (effective September 22, 2026, through December 3, 2026) limit imports ahead of December 4: Commerce will measure existing importers of record against their historical averages, while new importers face fixed weekly caps. Importers that exceed the limits will be barred from importing polysilicon products until they obtain a waiver, which could leave buyers with stranded orders and no blend. That makes a supplier’s importer-of-record history, or its in-country inventory, as important as its price.
The best strategy is to procure now. Wait too long, and the cost isn’t just a higher premium. It’s fewer options, longer timelines, delivery risk, and, on some projects, a domestic content adder that slips out of reach.
How Anza Can Help
Anza helps on both halves of the problem: getting the blend right and securing the supply you need before it’s gone.
Anza’s platform shows the whole market, not one quote. As of October 5, 80% of active suppliers on Anza’s platform had Section 232-inclusive pricing, covering 229 of 281 modules, so buyers can compare repriced quotes as they land. Domestic Content Mode in Anza’s Solar Pro product finds the lowest-cost mix of Domestic Cell, Domestic Lite, and imported modules that clears a project’s threshold, ranked by Effective $/W.
Anza’s Advisory Services team can help from domestic content blending analysis and strategy to negotiations and purchase orders. Supporting an annual procurement run rate of 5 GW of solar modules, the team can get OEMs’ attention when capacity is scarce, negotiate pricing and terms, and help close purchase orders and contracts within days. That includes remaining capacity at pre-negotiated import pricing that clears U.S. customs before December 4, landed U.S. inventory from manufacturers and other buyers on Anza Exchange, and contract terms that push retroactive and stockpiling tariff exposure to the supplier.
This isn’t the first deadline-driven rush Anza has navigated. During the September 2025 safe-harbor crunch, Anza helped 11 clients safe-harbor roughly 1,100 MW, 310 MW of it in the final week. Acting early is what worked then, too.
Get the guidance you need now:
- Use our Section 232 Polysilicon Domestic Content Blending Calculator to see the minimum domestic module share you need and what the cost and benefit are of an all-Domestic Cell vs. a blending buy.
- Then schedule a meeting with Anza’s team to walk through your project or portfolio, whether you want to self-serve in the platform or have our procurement team secure the best terms while supply allows.