Image: United Solar
Solar polysilicon manufacturer United Solar Holding has secured more than US$900 million in financing for its polysilicon manufacturing facility in Oman, marking a major milestone for the project.
The company said completion of the financing will enable production at its 100,000-metric-ton polysilicon plant to begin in the first quarter of 2026. Once fully ramped up, the facility is expected to supply enough polysilicon to support approximately 40 GW of solar module capacity annually.
United Solar said the plant has been designed to meet international standards for quality, traceability and environmental performance, and will be compliant with policy frameworks such as the US Foreign Entity of Concern (FEOC) requirements, enabling the company to supply polysilicon to the US market.
According to the Solar Energy Industries Association (SEIA), the US currently has around 25 GW of operational annual polysilicon capacity, with a further 8 GW announced. By contrast, total US solar module nameplate capacity exceeded 60 GW by the end of October 2025.
The financing includes US$480 million in debt from the International Finance Corporation (IFC) and partner banks for United Solar’s subsidiary United Solar Polysilicon, alongside more than US$400 million in term debt and working capital facilities from local commercial banks led by Sohar International Bank SAOG.
“This is a transformative moment for United Solar and the global solar industry,” said Sam Zhang, founder and chairman of United Solar. “With the support of OIA and IFC, we are building the infrastructure needed to strengthen the global solar supply chain and ensure reliable access to high-quality, traceable polysilicon that meets the world’s most rigorous standards.”
Total investment in the 100,000-ton polysilicon plant has reached US$1.6 billion. Previous financing rounds include US$250 million from the World Bank in August 2025 and OMR 60 million (US$155 million) from Oman’s sovereign wealth fund, the Future Fund Oman (FFO), in October 2024. The FFO is also United Solar’s largest shareholder, with a total investment of nearly US$260 million.
