Producer
Tongwei Co., Ltd.
Chengdu-based company that is the world's largest solar-grade polysilicon producer (capacity: ~230,000 MT/year in 2024). Originally founded as a fish feed and aquaculture company in 1984 — the solar division grew out of leveraging aquaculture pond rooftops for solar panel testing. Now controls ~26% of global polysilicon capacity and the largest global solar cell manufacturing operation.
2
Inputs supplied
2
Goods downstream
1
Facilities
0
Stories
What they make
2 inputs Tongwei Co., Ltd. supplies
Click an input to see every good that depends on it, every country that produces it, and every other company in the supply chain.
Where it shows up
Goods downstream
Essential goods that depend on something Tongwei Co., Ltd. makes — pick one to see the full supply chain.
What else they do
Business segments
The company's full revenue map — where this supply-chain role fits within their broader business.
Solar-Grade Polysilicon (World #1)
38%Solar Cells (World's Largest Producer)
35%Solar Modules & Agrivoltaic Systems
12%Aquaculture & Animal Nutrition (Original Business)
15%
Intelligence
What's known
Sourced claims about this company's role in supply chains — chokepoints, concentration, incidents, dual-use connections.
Did you know2023
Tongwei Co., Ltd. — the world's largest solar-grade polysilicon producer with ~26% global market share — is simultaneously one of China's largest aquaculture and animal feed companies. The 通威 (Tongwei) brand of fish feed is one of the most recognized aquatic feed brands in China, feeding millions of freshwater fish in carp, tilapia, shrimp, and eel farms across the Yangtze River basin and South China. The same Chengdu conglomerate that supplies ~26% of the polysilicon for global solar panel manufacturing also supplies the feed pellets for a significant portion of China's domestic fish production. A company in the aquaculture feed business — about as far from high-tech semiconductors as possible — invented a business model that leveraged fish ponds to develop solar technology expertise, and then built that expertise into a global clean energy supply chain monopoly position.
Tongwei Co., Ltd. ↗Origin2024
Tongwei Co., Ltd. — the world's largest solar polysilicon producer, controlling ~26% of global capacity — was founded in 1984 as a fish feed and aquaculture company. The solar division grew from experiments mounting PV panels on aquaculture pond covers to save on electricity costs. Today the same company supplies the silicon feedstock for a quarter of the world's solar panels while its aquaculture division remains one of China's largest fish feed producers.
S&P Global Commodity Insights ↗Concentration2025
Tongwei Co., Ltd. became the world's largest polysilicon producer by 2024, with approximately 910,000 MT of annual production capacity across three facilities — more than double its nearest competitor GCL Technology (480,000 MT, four facilities). Tongwei also manufactures solar cells (the step downstream from polysilicon), making it vertically integrated across two of the three most capital-intensive solar supply chain steps (polysilicon + cells). This vertical integration means Tongwei can internally consume its own polysilicon for cell production, giving it pricing power and supply security that pure-play polysilicon producers lack.
PV Tech ↗Capacity2023
Tongwei's 'Fishing-Solar Complementary' (渔光互补) agrivoltaic system — solar panels mounted above fish ponds — creates a virtuous cycle: the fish provide cooling water that improves panel efficiency by 5-10% (solar panels are 0.3-0.5% less efficient per degree Celsius above 25°C); the solar panels provide shade that reduces water temperature fluctuation and evaporation, improving fish growth; and the system produces both food and clean electricity from the same land area. Tongwei has deployed over 10 GW of agrivoltaic installations across China, predominantly over fish ponds. The concept born at a fish feed company has influenced global agricultural solar policy in Europe, the US, and Japan — countries are now studying and incentivizing 'agrivoltaics' as a dual land-use strategy. Tongwei's 1984 aquaculture company accidentally invented a land-use model that may reshape rural energy and food production globally.
Tongwei Co., Ltd. ↗