The Chinese Companies Behind America's Solar Supply Chain

A solar panel passes through four manufacturing stages before installation: polysilicon production, wafer slicing, cell fabrication, and module assembly. Chinese companies dominate each stage. The degree of dominance varies — it is near-total at the polysilicon and wafer stages, and substantial at the cell and module stages — but the aggregate picture is one of deep structural dependence.

This dependence did not emerge by accident. It reflects two decades of Chinese industrial policy, state financing, and manufacturing scale-up that drove down costs and displaced Western producers. The result is a global solar supply chain that runs, at its foundation, through China.

Polysilicon is the raw material from which solar wafers are cut. China produces an estimated 80–85% of global polysilicon supply. The dominant producers are GCL Technology, Tongwei, Daqo New Energy, and Xinte Energy — all Chinese companies, several with operations in Xinjiang.

The Xinjiang dimension is legally significant. The Uyghur Forced Labor Prevention Act (UFLPA), signed into law in December 2021, creates a rebuttable presumption that goods produced in Xinjiang — or by entities on the UFLPA Entity List — were made with forced labor and are therefore inadmissible to the United States. Polysilicon from Xinjiang-based producers falls within this presumption.

Enforcement has been uneven. U.S. Customs and Border Protection has detained shipments and required importers to demonstrate that polysilicon in their supply chains does not originate from Xinjiang. The practical challenge is traceability: polysilicon from different sources is blended at the wafer and cell stages, making origin verification technically difficult.

Solar wafers — thin slices of silicon cut from polysilicon ingots — are produced almost entirely in China. LONGi Green Energy, the world's largest solar manufacturer, dominates wafer production. TCL Zhonghuan, GCL Technology, and Jinko Solar are also major producers.

There is effectively no significant non-Chinese wafer manufacturing capacity. Western producers that once operated in this segment — including Wacker Chemie's downstream operations and various American companies — have largely exited the market, unable to compete with Chinese pricing.

Solar cells (which convert light to electricity) and modules (assembled panels) are the stages where Chinese manufacturers have most actively sought to circumvent American trade restrictions. Following anti-dumping and countervailing duty orders on Chinese solar products, Chinese manufacturers shifted assembly operations to Southeast Asia — primarily Vietnam, Malaysia, Cambodia, and Thailand.

The Commerce Department's 2022 circumvention investigation found that solar cells and modules assembled in these four countries using Chinese-origin wafers and cells were circumventing existing anti-dumping orders. The Biden administration subsequently imposed duties on these products, though enforcement timelines and exemptions created continued uncertainty.

The major Chinese solar manufacturers with Southeast Asian assembly operations include LONGi, Jinko Solar, JA Solar, Trina Solar, and Canadian Solar (a Chinese-founded company incorporated in Canada). These five companies collectively supply a substantial share of the modules installed in American solar projects.

The Inflation Reduction Act's manufacturing tax credits (Section 45X) have catalyzed significant announced investment in American solar manufacturing. First Solar, an American company that uses cadmium telluride rather than silicon technology, has expanded domestic capacity. Qcells (a subsidiary of South Korea's Hanwha Group) has announced a major Georgia manufacturing complex. Several Chinese-affiliated companies have also announced American manufacturing investments.

However, announced capacity and operational capacity are different things. As of mid-2026, domestic manufacturing covers a fraction of American solar demand. The polysilicon and wafer stages remain almost entirely dependent on Chinese supply. Analysts project that meaningful domestic supply chain diversification — if it occurs — is a multi-year process.

American solar policy contains a structural tension that has not been resolved. Climate policy goals — deploying solar capacity rapidly and at scale — favor low-cost Chinese-origin panels. Supply chain security and forced labor concerns favor restricting Chinese-origin products. These objectives pull in opposite directions, and the policy response has reflected that tension: tariffs and UFLPA enforcement on one side, deployment incentives and enforcement delays on the other.

The result is a solar buildout that is simultaneously subsidized by American taxpayers and dependent on Chinese manufacturing. Whether that dependence constitutes a strategic vulnerability — and if so, what to do about it — remains an active policy debate.