Published September 2026. Policy dates and figures below reflect the proclamation as issued; we will update this article as implementation details are clarified.
In August 2026 the White House signed a Section 232 proclamation covering polysilicon and the solar components made from it. The measure takes effect on December 4, 2026, and it will raise the landed cost of imported solar modules across the board.
For businesses weighing a commercial solar project, this is worth understanding now rather than discovering later — not because it changes whether solar makes sense, but because it affects what a system costs and when pricing is locked.
What the Proclamation Does
The action followed a Section 232 investigation in which the Secretary of Commerce found that the quantity and circumstances of polysilicon imports threaten to impair national security. It has two distinct parts, and the second is the one that matters most.
| Measure | Detail | Why It Matters |
|---|---|---|
| Tariff | 15% on imported polysilicon-derived components — ingots, wafers, cells and finished modules — regardless of country of origin | Applies globally, so sourcing from a different country does not avoid it. |
| Minimum import price | Floor prices including $0.22 per watt for solar cells and $0.38 per watt for solar modules | This is the binding constraint. Imported modules cannot enter below the floor no matter what they cost to make. |
| Effective date | December 4, 2026 | Approximately 120 days after the announcement. Goods landing after this date are subject to both measures. |
Why the Price Floor Matters More Than the Tariff
A 15% duty on a component is a manageable increase. A minimum import price is a different instrument: it sets an absolute floor beneath which imported product cannot be sold into the United States.
Recent reporting has put imported module pricing well below the new $0.38 per watt floor, with panels assembled in some markets trading at roughly a third of it. For product in that range, the floor — not the 15% — determines the new price. The cheapest imported modules are affected most; product already priced near or above the floor is affected least.
Domestically assembled modules are not subject to the import measures. U.S. assembly capacity has been reported as exceeding annual U.S. installation volume, so supply exists. Historically it has carried a premium over the lowest-cost imports, and the new floor narrows that gap considerably.
What It Means for a Commercial Project Budget
Modules are a significant line item in a commercial solar system, but they are not the whole of it. Racking, inverters, conductors, switchgear, engineering, permitting, interconnection and labor make up a substantial share of installed cost, and none of those are directly affected by this action.
So the direction is clear and the magnitude is not dramatic: imported-module pricing goes up, project cost follows to a lesser degree, and the effect varies with the equipment a given design specifies.
We are not going to publish a percentage. Module pricing moves, supply chains adjust, and any number we printed today would be wrong by the time you read it. What we will do is quote your project at current pricing and tell you plainly what the equipment costs when we price it.
How This Interacts With the Tax Credit Deadline
Businesses evaluating commercial solar are working against a second clock. Projects that did not begin construction by July 4, 2026 must be placed in service by December 31, 2027 to qualify for the federal Investment Tax Credit.
Those two timelines point the same direction. A project that moves in the coming months prices equipment sooner and leaves comfortable margin against the credit deadline. A project that waits faces both a changed module market and a compressed schedule.
We cover the deadline and what it requires in detail in a companion article on the December 31, 2027 placed-in-service requirement.
Tax treatment depends on your specific circumstances. Consult your tax professional.
What This Means for Commercial Customers
Tariffs are not a reason to install solar, and they are not a reason to avoid it. The economics of a right-sized commercial system rest on the utility bill it retires over twenty-five years, and a modest change in module pricing does not overturn that.
What this action does change is the value of moving deliberately rather than indefinitely. Equipment pricing is one of the few variables in a solar project that a business can influence purely by timing.
At Light Ray Electric we design in-house and purchase for each project individually, so we can tell you exactly what is specified, what it costs today, and what the alternatives are.
Our Design Philosophy
Our answer to rising equipment cost is the same as our answer to everything else: build the system the building actually needs. A right-sized array buys fewer modules to begin with, which makes it the design least exposed to module pricing in the first place.
Request a free consultation to get current pricing for your facility.