First Solar to Pull Section 337 Complaint Following New US Polysilicon Tariff Action

Solar module manufacturer First Solar said it will withdraw its Section 337 complaint, a move that comes on the heels of a recent US Section 232 action covering polysilicon and its derivative products. The decision ties the fate of the trade case to a separate trade mechanism that now addresses some of the same import concerns at the border.

Section 337 refers to a statute that allows companies to petition the US International Trade Commission over unfair trade practices, including intellectual-property-related import injuries. Section 232, by contrast, is a national-security-based trade authority that can lead to tariffs or quotas on specific materials — in this case, polysilicon, the key raw material for most crystalline silicon solar panels, and derivative goods made from it.

For First Solar, the shift in the trade landscape appears to have reduced the practical need to pursue the ITC route. The company’s core product line uses thin-film semiconductor technology rather than the crystalline silicon architecture that dominates most of the global module market, which has historically placed it alongside domestic crystalline-silicon manufacturers in advocating for trade measures against certain imported panels.

Shares of First Solar traded at $203.10 in the latest session, down 4.85% from the prior close of $213.45, giving the company a market capitalization of roughly $23.1 billion. The stock’s decline came as the withdrawal announcement circulated, though broader market conditions and sector sentiment also influence daily moves in solar equities.

The development lands at a moment when the US solar supply chain is being reshaped by overlapping trade policies, domestic manufacturing incentives, and shifting input costs. Polysilicon sits upstream in the solar value chain — the earliest stage of production — and tariff actions on it can ripple downstream to module prices, project economics, and developers’ levelized cost of energy (LCOE), a common measure of the per-unit cost of electricity generated over a project’s lifetime.

Withdrawing the complaint does not foreclose future trade petitions; companies retain the ability to raise new claims if market conditions change. For now, the Section 232 framework becomes the primary policy instrument bearing on polysilicon imports, and manufacturers, developers, and importers alike will be monitoring how it is implemented in practice.

What to watch

• Implementation details of the Section 232 action on polysilicon and derivative products, including tariff levels and product scope.
• First Solar’s upcoming quarterly earnings report and any updated manufacturing or shipment guidance.
• Whether other domestic module makers pursue or withdraw comparable trade petitions.
• Comments from downstream developers and utilities on module pricing and project cost impacts as the policy takes effect.

Source: original release