Section 232 Solar Tariffs: What Commercial Solar Buyers Need to Know
The cost and sourcing of solar equipment in the United States is entering another period of change.
In August 2026, the federal government announced new trade measures under Section 232 of the Trade Expansion Act targeting imports of polysilicon and products made from it, including solar cells and modules.
Beginning December 4, 2026, covered imports will be subject to new minimum import prices, while many downstream polysilicon products will also face an additional 15% tariff.
For businesses considering commercial solar, this does not mean that every solar project will suddenly cost 15% more. But it does mean equipment sourcing, manufacturing location and procurement timing are becoming increasingly important factors when evaluating a project.
Here is what commercial property owners should know.
What Is Section 232?
Section 232 of the Trade Expansion Act of 1962 gives the federal government authority to investigate whether certain imports threaten to impair U.S. national security and, when necessary, take action to adjust those imports.
Historically, Section 232 has been associated with products such as steel and aluminum. More recently, the federal government has expanded its use to industries and supply chains considered strategically important to the United States.
In 2026, that expanded to polysilicon.
Polysilicon is a highly purified form of silicon that serves as a foundational material for both semiconductors and solar photovoltaic products. Solar-grade polysilicon is processed into ingots and wafers, which are then used to manufacture solar cells and ultimately solar modules.
Following a Department of Commerce investigation, the federal government determined that U.S. dependence on imported polysilicon and its derivative products posed a national security concern.
According to the August 2026 presidential proclamation, the United States accounted for less than 2% of global polysilicon production capacity in 2024 and was “virtually entirely dependent” on imports of solar ingots, wafers and cells.
The new Section 232 measures are intended to encourage more of that supply chain to move to the United States.
Laymans Summary of How Section 232 Impacts Commercial Solar Systems
This tariff was put in place for US manufacturing to compete in the solar panel manufacturing space. We all see solar panel manufacturing facilities popping up all over the Country, and this tariff is supposed to be a price floor on imports, so that US manufacturing doesn’t get undercut by outside Countries.
Our expert opinion is that this will not have a dramatic affect on pricing. Most solar panel manufacturers that we work with (Top 20 global brands) have already invested in US manufacturing facilities. This tariff will speed up the adoption of domestic sourcing materials in the US. One manufacturer already said it will have less than a 10% impact on solar panel pricing due to the fact that they were already sourcing domestic components already, so those domestic components price will not be affected by Section 232 tariffs.
If in fact there is a 10% price increase on solar panels, this is a smaller percent increase on the overall project cost. WattHub sees a bright future for solar panel installation as foreign and domestic solar panel manufacturers are already shifting their componentry to US made products. Considering the tax credit expiration at the end of 2027, if you are thinking about a commercial solar system for your building or business, don’t waste anymore time. Get it in motion quickly to avoid the tariff that is being enacted on December 4th 2026. There will still be an existing inventory of solar panels pre-tariff after December 4th, but supply is selling quickly.
See a deeper explanation below on the tariff itself:
What Are the New Section 232 Tariffs on Solar Products?
The new policy has two major components that affect the solar industry.
First, the federal government established minimum import prices for several products within the solar manufacturing supply chain.
The initial minimum prices are:
• Polysilicon: $21 per kilogram
• Polysilicon ingots and wafers: $100 per kilogram
• Solar cells: $0.22 per watt
• Solar modules: $0.38 per watt
These minimum prices are designed to prevent covered imported products from entering the U.S. market below specified price levels.
If covered merchandise enters the country below the applicable minimum import price, additional duties may be assessed to account for the difference.
Second, many covered polysilicon derivative products will also be subject to an additional 15% Section 232 tariff.
Both measures are scheduled to take effect on December 4, 2026.
There are important exceptions and different treatments for certain U.S. trading partners, so the actual tariff applicable to a particular product can depend on its country of origin and other factors.
Why Is the U.S. Targeting Polysilicon and Solar Manufacturing?
The reasoning behind the tariffs goes beyond solar pricing.
Polysilicon is a foundational material for two industries the federal government considers strategically important: semiconductors and solar energy.
According to the federal government’s Section 232 findings, the U.S. share of global polysilicon production capacity fell from approximately 50% in 2005 to less than 2% in 2024.
At the same time, global polysilicon production has grown substantially. The federal government reported that worldwide production increased by more than 270% since 2020, contributing to significant global oversupply.
The concern is that low-cost foreign production makes it difficult for U.S. manufacturers to compete economically, leaving the country increasingly dependent on overseas supply chains.
The new tariffs and minimum pricing requirements are designed to create stronger economic conditions for domestic production of polysilicon, ingots, wafers, cells and other related products.
The policy also creates an incentive program for companies that commit to investing in new or expanded U.S. manufacturing facilities.
Does This Mean Solar Panels Will Cost 15% More?
Not necessarily.
A 15% tariff on certain imported products does not translate directly into a 15% increase in the total price of a commercial solar project.
A commercial solar installation includes much more than solar modules. Total project costs can include inverters, racking, electrical equipment, engineering, permitting, labor, interconnection, development and other project-specific expenses.
The impact will also depend on which equipment is selected and where it is manufactured.
Certain countries and products receive different treatment under the proclamation. Products from qualifying trade partners may also receive exemptions under specific circumstances, particularly when the polysilicon contained in those products originates from a qualifying trade partner.
The result is that tariff exposure will need to be evaluated at the equipment and project level rather than through a simple percentage applied to the entire solar installation.
What Could the Tariffs Mean for Commercial Solar Projects?
The most immediate effect for commercial solar buyers is likely to be greater emphasis on procurement and equipment sourcing.
Equipment Origin Becomes More Important
Two solar modules with similar technical specifications may have different tariff exposure depending on where the product and its underlying components were manufactured.
Developers will increasingly need to understand not only the brand of equipment being proposed, but also the underlying supply chain.
Procurement Timing Could Matter
The new Section 232 measures are scheduled to apply to covered goods entered for consumption, or withdrawn from warehouse for consumption, beginning December 4, 2026.
That makes procurement schedules particularly relevant for projects currently under development.
Businesses evaluating projects should discuss with their solar provider when equipment will be purchased, when it is expected to enter the United States and whether pricing assumptions account for the new trade measures.
Domestic Manufacturing May Become More Competitive
One of the explicit objectives of the policy is to encourage investment in U.S. polysilicon and solar manufacturing.
The proclamation authorizes an onshoring program that can provide tariff benefits to companies investing in new or expanded U.S. production of polysilicon, ingots, wafers and cells.
Over time, that could increase the availability of domestically produced components and further change how commercial solar projects source equipment.
Project Economics Should Be Evaluated Using Current Pricing
Businesses should be cautious about assuming that historical solar equipment pricing will continue unchanged.
At the same time, tariff headlines alone do not determine whether a solar investment makes financial sense.
The more useful question is what a specific project costs today, how much electricity it is expected to produce and what financial return those savings create over the life of the system.
What Should Businesses Ask Their Solar Provider?
Businesses considering commercial solar should understand how current trade policy has been incorporated into their project’s pricing and equipment strategy.
Questions worth asking include:
• Which solar modules are being proposed for the project?
• Where are those modules, cells and major components manufactured?
• Are any of the proposed products subject to the new Section 232 tariffs or minimum import prices?
• Does the current project pricing already account for those costs?
• When will the equipment be procured and imported?
• Are domestically manufactured or tariff-advantaged alternatives available?
• Could changing equipment affect the project’s cost, production or expected return?
These questions can help businesses understand whether a proposal is based on realistic current-market assumptions.
Section 232 Is Part of a Larger Shift in the U.S. Solar Market
The new tariffs are one piece of a much larger change taking place across the U.S. solar industry.
Federal policy is increasingly focused on where solar equipment comes from, how it is manufactured and how dependent the United States should be on foreign supply chains.
Trade policy, domestic manufacturing incentives, cybersecurity requirements and changes to federal tax incentives are all affecting how solar projects are developed and financed.
For commercial property owners, that makes choosing equipment and timing procurement more complex.
But it does not change the fundamental calculation behind a commercial solar investment.
The decision still comes down to what the system costs, how much electricity it produces, how much utility expense it can offset and what financial value the project creates over its useful life.
What WattHub Is Watching
Section 232 policy can continue to evolve as the Department of Commerce implements the new rules and monitors imports.
WattHub is continuing to monitor:
• Implementation of the December 4, 2026 tariffs and minimum import prices
• Changes to covered solar products
• Solar module and equipment pricing
• Growth in U.S. solar manufacturing
• Equipment availability and procurement timelines
• Additional federal trade actions affecting commercial solar
• Changes to federal solar tax policy
For businesses considering solar, the goal should not be to predict every future trade policy change. It should be to build project economics around current information, understand the equipment being proposed and evaluate whether the investment makes financial sense under realistic assumptions.
Sources & Further Reading
The White House, “Adjusting Imports of Polysilicon and its Derivatives into the United States,” Presidential Proclamation, August 6, 2026.
https://www.whitehouse.gov/presidential-actions/2026/08/adjusting-imports-of-polysilicon-and-its-derivatives-into-the-united-states/
The White House, “Fact Sheet: President Donald J. Trump Bolsters National Security and Strengthens U.S. Supply Chains by Imposing Tariffs on Polysilicon and its Derivatives,” August 6, 2026.
https://www.whitehouse.gov/fact-sheets/2026/08/fact-sheet-president-donald-j-trump-bolsters-national-security-and-strengthens-u-s-supply-chains-by-imposing-tariffs-on-polysilicon-and-its-derivatives/
The White House, Annex I: Minimum Import Prices for Polysilicon and Polysilicon Derivatives, August 2026.
https://www.whitehouse.gov/wp-content/uploads/2026/08/ANNEX-I.pdf
The White House, Annex II: Harmonized Tariff Schedule Modifications for Polysilicon and Derivative Products, August 2026.
https://www.whitehouse.gov/wp-content/uploads/2026/08/Annex-II.pdf
