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Solar Silicon Cost Rises for Eighth Week in Blow to Clean Energy

Polysilicon prices are at the highest level since 2011, threatening to slow solar panel installations

Solar Panels
Photographer: Theo Giacometti/Bloomberg

Polysilicon prices extended gains into an eighth week because of factory outages, threatening to slow the pace of solar panel installations just as governments around the world boost clean energy targets.

The average cost of the most expensive grade of polysilicon rose 0.9% to 297.6 yuan ($44.08) per kilogram on Wednesday, according to the China Silicon Industry Association. A separate index compiled by BloombergNEF shows prices are at the highest level since 2011.