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WASHINGTON, D.C. — The Coalition for a Prosperous America (CPA) today underscored that the U.S. Department of Commerce’s preliminary antidumping determinations in the Solar 4 trade case further confirm the need for a comprehensive, full supply chain approach in the ongoing Section 232 investigation into polysilicon and its derivative products.
Commerce’s preliminary determinations found combined AD/CVD rates of approximately 139% for Indonesia, 103% for Laos, and 234% for India, along with findings of critical circumstances that could trigger retroactive tariffs. These findings reinforce a persistent pattern in global solar trade: when enforcement actions target specific countries, production and shipments shift to new jurisdictions. This dynamic underscores the limitations of country-by-country remedies and the need for durable, system-wide policy solutions.
At the same time, effective policy must distinguish between supply chains that are driven by subsidized, export-oriented production models and those that are independently owned, transparent, and directly supportive of U.S. manufacturing. As the United States works to rebuild domestic capacity, maintaining access to compliant upstream inputs that are integrated with and reinforce U.S.-based production will be important to ensuring that domestic manufacturing can scale efficiently and competitively.
At the center of this challenge is the domestic crystalline silicon photovoltaic (PV) cell industry—one of the most strategically important and historically underdeveloped segments of the U.S. solar manufacturing supply chain. Rebuilding domestic cell capacity is essential not only for energy generation, but for sustaining domestic demand for U.S.-produced polysilicon and ensuring that upstream production is matched with downstream domestic manufacturing capacity. Without a strong downstream manufacturing base, U.S. polysilicon producers risk becoming dependent on foreign manufacturers for end-use consumption, undermining both industrial resilience and long-term investment.
This issue extends beyond the solar sector. As CPA has emphasized in its recent analysis on solar energy’s importance to U.S. economic and national security, the same polysilicon ecosystem that supports solar manufacturing is foundational to the semiconductor industry. Weakness in domestic solar manufacturing directly impacts the scale, stability, and security of U.S. polysilicon production—creating potential vulnerabilities across both energy and advanced technology supply chains.
“Commerce’s preliminary determinations in the Solar 4 case reinforce what we have consistently seen—foreign producers adapt quickly to trade enforcement actions, and partial measures are not enough,” said Jon Toomey, President of the Coalition for a Prosperous America. “The administration now has an opportunity through the Section 232 polysilicon investigation to take a comprehensive approach that supports domestic production across the entire solar supply chain—particularly the crystalline silicon solar manufacturing sector. That includes ensuring strong domestic demand for U.S. polysilicon through robust cell and module manufacturing here at home.”
CPA has consistently warned that isolated tariffs on polysilicon risk creating unintended consequences. In its Section 232 comments supporting tariffs across the full domestic solar supply chain, CPA emphasized that policies must be structured to promote both domestic production and domestic consumption. Without coordinated action across polysilicon, ingots, wafers, cells, and modules, foreign manufacturers could incorporate U.S. inputs while continuing to dominate downstream production—undermining domestic investment. Critically, tariffs applied only to polysilicon would create a new and dangerous dependency by tying the viability of U.S. solar and polysilicon supply chains to continued purchases by Chinese manufacturers—effectively making American production reliant on CCP-controlled demand.
At the same time, policymakers should ensure that measures designed to strengthen domestic production do not inadvertently constrain the availability of compliant upstream inputs that are directly supportive of U.S. based manufacturing and investment.  Applying trade remedies without regard to how supply chains interact with U.S. manufacturing risks weakening domestic production by restricting inputs that are necessary to sustain it.
Recent developments in U.S. solar manufacturing demonstrate that American industry is prepared to scale when policy provides the right framework. As CPA highlighted in its recent statement on Suniva’s $350 million investment in a new solar cell manufacturing facility in South Carolina, U.S. manufacturers are making significant commitments to expand domestic cell capacity. These investments build on a broader resurgence in U.S. solar manufacturing and reflect growing confidence that domestic production can compete and grow.
CPA’s prior work—including its landmark report on the U.S. solar supply chain and strong support of enforcement actions against trade violations from Southeast Asia and for previous trade petitions—has consistently documented the scale of China’s dominance and the systemic nature of global overcapacity and trade circumvention.
The Solar 4 case highlights both the progress being made through trade enforcement and the limits of fragmented approaches. CPA urges the Trump administration to use the Section 232 process to implement a durable, full supply chain strategy that strengthens domestic manufacturing, supports U.S. producers, and secures critical industrial capabilities across both the crystalline silicon solar and semiconductor sectors while clearly distinguishing between high-risk, trade-distorting supply chains and those that reinforce U.S. industrial growth.
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CPA is the leading national, bipartisan organization exclusively representing domestic producers and workers across many industries and sectors of the U.S. economy.
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