Your Panels Got a Second Set of Tariffs. Customs Is Already Collecting Them.

If you are collecting solar quotes this fall, you already knew about December 4. There is a second thing, it is bigger on paper, and Customs started collecting on it months ago.

On September 16 the Commerce Department published its final determinations in an antidumping and countervailing duty case covering solar cells from India, Indonesia and Laos. The all-others dumping margins came in at 123.04% for India, 94.36% for Indonesia and 65.43% for Laos. Stack the subsidy side on top, at 126.09%, 73.20% and 82.03%, and India alone lands near 249%.

Watch what happened between the draft and the final. In April the preliminary dumping margins were 123.04% for India, 35.17% for Indonesia and 22.46% for Laos. Indonesia’s final number is nearly triple the preliminary. Laos almost tripled too.

Why these three countries and not the ones you remember? Because the panels moved. The Alliance for American Solar Manufacturing and Trade, led by First Solar, Hanwha Qcells and Mission Solar, filed the petition in July 2025 arguing that producers relocated out of Cambodia, Malaysia, Thailand and Vietnam after those countries got hit. This is the same case, one hop downstream. Duties land, production walks across a border, duties follow. Nobody in this fight is a consumer advocate, including the side that wins.

The volume is not trivial. Those three countries supplied just over 6.0 gigawatts of covered solar product worth roughly $1.54 billion in 2024, split about $792.6 million India, $415.2 million Indonesia, $335.7 million Laos.

Here’s the catch, and it is the useful part. The duty rate is not your number.

At $1.54 billion across 6.0 gigawatts, the imported cell in your system is worth something like 26 cents a watt at the border. An 8 kW system runs about $20,960 installed, per EnergySage’s 2026 figure, or roughly $2.62 a watt. The cell is a slice of what you pay, and no installer is going to keep buying at a 249% markup anyway. Supply will move again. What actually reaches your driveway is not a 249% panel, it is a slightly higher floor under every panel, plus the Section 232 minimum import prices we wrote about in the December 4 change.

So the risk to you is not the tariff. It is the change order.

Do this before you sign anything this fall. Ask, in writing, what country the cells in your quoted panels come from. Then ask whether the price is all-in, or whether the contract lets the installer pass a tariff or duty increase through to you after signature. If that clause exists, strike it or walk. A quote you cannot hold is not a quote.

And ignore the deadline pitch. The International Trade Commission still has to vote on October 14, orders would issue around November 2, and if the Commission finds no injury, every dollar of deposit gets refunded and the whole thing goes away. Run your own numbers in our solar calculator, pull three quotes off the solar hub, and compare what installers will actually write at a fixed price.

The salesman gets a new deadline every quarter. You get one contract.

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