How to Assess PV Module Supply-Chain Traceability Under the UFLPA: What the Law Presumes, What an Importer Must Prove, What CBP Asks For on Polysilicon, Who Is on the Entity List, and What the Enforcement Numbers Say

Short answer. For a module bound for the United States, traceability is not a marketing claim; it is the evidence an importer must be able to put in front of US Customs and Border Protection (CBP). Since 21 June 2022 the Uyghur Forced Labor Prevention Act (UFLPA) has presumed that goods made wholly or in part in the Xinjiang Uyghur Autonomous Region, or by an entity on the UFLPA Entity List, are prohibited imports; the presumption is set aside only if the importer complied with CBP's guidance, answered every CBP inquiry completely, and proved by clear and convincing evidence that the goods were not made with forced labour. Polysilicon is a statutory high-priority sector, and CBP's guidance tells importers what a polysilicon supply-chain file should contain, from the quartzite onward. This guide reads the statute, CBP's guidance, the DHS strategy and Entity List, and two laboratory and agency reports on where polysilicon is made. It describes US import rules only, and it attributes statements about Xinjiang to the US documents that make them.

1. What the law presumes

Public Law 117–78 was enacted on 23 December 2021. Section 3 directs the CBP Commissioner to presume that goods mined, produced or manufactured wholly or in part in the Xinjiang Uyghur Autonomous Region, or produced by an entity on the lists the Act requires under section 2(d)(2)(B)(i), (ii), (iv) or (v), are prohibited under section 307 of the Tariff Act of 1930 and not entitled to entry. The presumption is set aside only if the Commissioner determines that the importer of record fully complied with the statutory guidance and any implementing regulations, completely and substantively responded to all CBP information requests, and showed by clear and convincing evidence that the goods were not made wholly or in part with forced labour; each exception must be reported publicly within 30 days; Section 3 took effect 180 days after enactment. CBP's programme page confirms that CBP enforces the presumption, conducts applicability and exception reviews when goods are detained, and that the presumption went into effect on 21 June 2022.

The Act also requires the enforcement strategy to name high-priority sectors, which must include cotton, tomatoes and polysilicon. For a module buyer the consequence is that polysilicon is the input CBP's documents single out.

2. What an importer must be able to show

CBP's operational guidance of June 2022 lists the categories of evidence an importer may need: documentation of a due-diligence system, supply-chain tracing information, supply-chain management measures, evidence that the goods were not made wholly or in part in Xinjiang and, for China-origin goods, evidence that they were not made with forced labour. The last category may include a supply-chain map of all entities, worker information such as wage payment and output per worker, recruitment information and internal controls, and credible audits. The guidance says its lists are not exhaustive, additional documentation may be required, and each detained shipment receives a detention notice stating the reasons.

For polysilicon specifically, Appendix A asks for complete transaction records and supply-chain documentation showing all entities involved in manufacturing, manipulating or exporting the good and the country of origin of each material back to the suspected source; a flow chart of each procurement and production step identifying where each material originated, from the quartzite used to make polysilicon to the polysilicon plants to the downstream facilities; and a list of all entities at each step with citations to the business records used to identify upstream parties the importer did not deal with directly. It warns that goods from factories that source polysilicon both inside and outside Xinjiang risk detention, because it is harder to verify that only non-Xinjiang polysilicon was used and that materials were not replaced or commingled.

CNWattHub editorial method: read the Appendix A list as the minimum table of contents for a module traceability file — quartz, metallurgical-grade silicon, polysilicon, ingot, wafer, cell, module — with one documented transaction chain per step and the factory's sourcing policy on mixed polysilicon stated in writing.

3. Who is on the lists

The DHS strategy of June 2022 published the initial lists. Its Section 2(d)(2)(B)(i) list of Xinjiang entities included Hoshine Silicon Industry (Shanshan) and subsidiaries, Xinjiang Daqo New Energy, Xinjiang East Hope Nonferrous Metals, Xinjiang GCL New Energy Material Technology and the Xinjiang Production and Construction Corps, and the strategy's product table describes the three polysilicon makers' products as polysilicon including solar-grade polysilicon. The list has since grown. The DHS UFLPA Entity List page records each entity with an effective date; its Section 2(d)(2)(B)(v) list, for entities that source material from Xinjiang or from persons working with the Xinjiang government or XPCC under labour schemes, includes solar-sector entries effective 15 January 2025: Baotou Meike Silicon Energy, Donghai JA Solar Technology, Hongyuan Green Energy and Jiangsu Meike Solar Technology. The page is dynamic; the entries above are those on the retrieval date, and a buyer should read the current page.

4. Why polysilicon origin is the crux

Two official estimates of concentration exist, and they differ. The DHS strategy states, with its own footnoted sources, that Xinjiang produces about one-fifth of the world's cotton and about half of the world's polysilicon, and that materials made in Xinjiang may be shipped to another province or a third country and commingled with inputs from other regions, obscuring origin. The IEA's 2022 Special Report on Solar PV Global Supply Chains says China's share of global polysilicon, ingot and wafer production would soon reach almost 95% on the basis of capacity under construction, and puts Xinjiang at 40% of global polysilicon manufacturing. Both figures date from 2022 and are reported here as attributed estimates, not current data. The US DOE's 2022 supply-chain deep dive ranks Xinjiang first among Chinese provinces for polysilicon manufacturing and says forced labour in raw-material mining and processing there adds uncertainty to the supply chain's reliance on Chinese production, with metallurgical-grade silicon and the coal used for electricity highlighted by the US government as beneficiaries of forced-labour programmes. The DHS strategy also notes that the US Department of Labor's list of goods produced by child or forced labour includes polysilicon for China, added in 2021.

5. What the enforcement numbers say

DHS's FY2024 review reports that CBP stopped 4,850 shipments worth $1.75 billion suspected of forced-labour content in FY2024; 4,614 of them ($1.73 billion) were subject to UFLPA reviews or enforcement; CBP denied entry to 1,570 shipments ($185 million) for presumed UFLPA violations or failure to provide evidence, released 2,121 shipments ($1.29 billion), and the rest were pending at publication. These counts cover all commodities, not solar alone. CNWattHub arithmetic on those figures: by value, the released shipments ($1.29 billion) were about 75% of the $1.73 billion under UFLPA review, and the denied shipments ($185 million) about 11%; by count, 2,121 of 4,614 is about 46% released and 1,570 of 4,614 about 34% denied, with the remainder pending. The gap between value shares and count shares is in the source's numbers; this guide does not infer a cause. No solar-specific detention count is quoted here (see Scope limits).

Reading table

Checklist

CNWattHub editorial method, not a sourced rule:

1. Ask the module supplier for the Appendix A file: transaction records and a flow chart for every step from quartzite to module, with the entity at each step named and the records cited.
2. Ask in writing whether any factory in the chain sources polysilicon from both inside and outside Xinjiang; CBP's guidance treats mixed sourcing as a detention risk.
3. Screen every named entity, including aliases and former names, against the current DHS Entity List page.
4. Keep worker-level evidence (wage payment, output per worker, recruitment controls) and audit reports for Chinese sites, since CBP's guidance lists them for China-origin goods.
5. Plan for a detention: the guidance says a detention notice states the reasons, and the statute requires a complete and substantive response to every inquiry.

Scope limits

US statute, CBP and DHS documents, and one DOE and one IEA report only. The guide describes US import compliance; it does not describe the EU Forced Labour Regulation (not retrievable in this session) or any Chinese regulation on supply-chain tracing. Statements about labour conditions in Xinjiang are attributed to the US government documents that make them. No solar-specific detention statistic is quoted, because the figures on CBP's UFLPA statistics page could not be retrieved as text in this session; the two polysilicon-share figures are 2022 estimates. The Entity List page is dynamic. Not legal or trade-compliance advice.