The China Solar Supply Chain: What Hawaii Homeowners Should Know

One country controls nearly the entire solar panel supply chain, from raw material to finished product. The numbers are staggering:

China produces roughly 95% of global polysilicon (the raw material), 97% of solar wafers, 85% of solar cells, and 80% of finished modules.^[1] This level of market concentration is almost unheard of in any global industry. It developed over 15 years through a combination of massive government subsidies, industrial policy, ruthless economies of scale, and pricing so aggressive it drove competitors out of business one by one.

The result: even panels with Japanese, German, or American brand names often contain Chinese polysilicon, wafers, or cells somewhere in their supply chain. And that creates three problems that directly affect your solar project in Hawaii — forced labor concerns, customs enforcement, and delivery reliability.

The Forced Labor Problem

In June 2022, the Uyghur Forced Labor Prevention Act (UFLPA) took effect.^[2] The law creates a rebuttable presumption that any goods from China's Xinjiang region are made with forced labor and banned from US import. This matters enormously for solar because 35–45% of global polysilicon production happens in Xinjiang.^[1] Daqo New Energy, East Hope, GCL-Poly, and Xinte Energy all operate massive facilities there. Multiple independent investigations have documented the connection between Xinjiang polysilicon production and forced labor practices.

US Customs and Border Protection enforces the UFLPA by detaining solar panel shipments at ports of entry and demanding that importers prove no Xinjiang-sourced materials are in the supply chain. The burden is on the importer, not the government. Since enforcement began, CBP has detained thousands of shipments, holding them for weeks or months.^[3] Some eventually get released. Others are permanently excluded.

We see the fallout on the ground here in Hawaii. A homeowner in Ewa Beach told us last year that they signed a contract with another installer in March, were promised a June installation, and their panels were still sitting in a Long Beach customs warehouse in September. The installer could not provide traceability documentation, so CBP held the shipment. That family paid HECO for six extra months at $0.47/kWh while waiting for panels that might never clear customs. They eventually cancelled and came to us. We had their system up in five weeks.

Who Operates Outside the Chinese Supply Chain

A small but critical segment of the global solar market has built supply chains independent of Chinese materials. These panels cost more, and the reason is straightforward: they can survive tariff enforcement and UFLPA scrutiny.

REC Group manufactures in Singapore using proprietary heterojunction (HJT) cell technology.^[4] The key differentiator is their polysilicon source: REC Silicon's facilities in Norway (the Fiskaa and Heroya plants) and Moses Lake, Washington. That gives REC a fully traceable, non-Chinese polysilicon chain. Their panels carry a 25-year product and performance warranty and consistently rank among the highest-efficiency residential panels on the market.

Hyundai Energy Solutions manufactures in South Korea with a vertically integrated supply chain. South Korean manufacturing provides clean traceability, avoids UFLPA and tariff issues, and carries the financial backing of the Hyundai conglomerate — a company that is not going anywhere.

Several companies assemble panels in the United States, including Qcells (Georgia), First Solar (Ohio), and Silfab (Washington/New York). But "assembled in the USA" does not mean what most people think. Only First Solar, which uses cadmium telluride thin-film technology instead of crystalline silicon, has a fully non-Chinese supply chain by default^[5] — because it does not use polysilicon at all. For the others, you have to ask where the cells and wafers come from. The answer is not always comfortable.

Why We Chose REC and Hyundai

Our decision to standardize on these two brands was not about marketing. It was a supply chain strategy.

Both manufacturers can document their polysilicon sources, which means zero UFLPA detention risk and reliable delivery timelines. Singapore and South Korea manufacturing avoids the Southeast Asian circumvention duties that pile cost onto panels from Vietnam, Cambodia, Thailand, and Malaysia. And manufacturers that invested in building non-Chinese supply chains tend to be the same ones that invested in premium cell technology, better quality control, and longer warranties. Those decisions are correlated for a reason: companies that take shortcuts on sourcing take shortcuts elsewhere, too.

When we commit to an installation date, our panels show up. We do not call customers two weeks before their install to say, "Sorry, your panels are stuck at customs in Long Beach." That peace of mind is built into the supply chain choice, not the sales pitch.

What "Made in USA" Actually Means

Be careful with this label. "Fully US-manufactured" — where polysilicon, wafers, cells, and module assembly all happen domestically — is extremely rare. First Solar comes closest, but with non-silicon technology. The far more common scenario is "US-assembled with imported cells," where cells from South Korea, Malaysia, or elsewhere are soldered into modules at an American facility. That qualifies for domestic content bonuses under certain programs, but it does not eliminate foreign supply chain dependencies. And "US-assembled with Chinese-origin cells" is still possible, still legal, and still carries UFLPA risk if the upstream polysilicon is not properly traced.

Brand name and assembly location tell you less than you think. Supply chain documentation tells you everything.

Five Questions to Ask Any Installer

If you are shopping for solar in Hawaii, these questions will separate the companies that have done the supply chain work from those that have not:

1. "Where are your panels manufactured?" — Get the country of module assembly, not just the brand headquarters.
2. "Where are the solar cells made?" — Cell manufacturing often happens in a different country than panel assembly.
3. "Where is the polysilicon sourced?" — This is the UFLPA question. If they cannot answer it, walk away.
4. "Have any of your panel shipments been detained by US Customs in the past 12 months?" — A direct indicator of whether their supply chain can survive enforcement.
5. "Can you provide written supply chain traceability documentation?" — Reputable manufacturers provide this. If your installer cannot produce it, your project timeline is at risk.

At AEI, we can trace our panels from Norwegian polysilicon to Singapore and South Korean factories to your roof. No ambiguity, no customs risk, no six-month delays while someone in a government office decides whether your panels are legal to import.