LONGi Green Energy has reportedly filed a public environmental impact assessment announcement for a new "Novel Crystalline Silicon-Perovskite Tandem Solar Cell Technology and Equipment Industrialization Project," confirming plans to invest 204 million yuan (about $28 million) in a 100 MW pilot production line for high-efficiency silicon-perovskite tandem solar cells in Xixian New Area, Shaanxi Province.
According to the announcement, the project is classified as a modification and will occupy roughly 4,000 square meters within the existing plant of LONGi's previously registered Phase I Pilot Project at its Central Research Institute. Rather than building new facilities from scratch, LONGi will use the leased factory space and supporting infrastructure already in place, installing key equipment such as perovskite thin-film deposition systems, perovskite rapid crystallization tools and functional-layer thin-film deposition equipment to support R&D and pilot-scale testing of the tandem cells.
The move follows a rapid run of efficiency records for LONGi's two-terminal silicon-perovskite tandem cells: in May 2026, the company's independently developed tandem cell reached a certified conversion efficiency of 35.2%, as recorded in the 68th edition of the Solar Cell Efficiency Tables compiled by Professor Martin Green's team at the University of New South Wales. In July, LONGi pushed the efficiency further to 35.5%, breaking its own world record for the technology again.
With this pilot line, LONGi's tandem cell program takes its next step: moving the technology out of the lab, where it has spent the past year marking successive efficiency records, and into the kind of pilot-scale production run needed before it can be industrialized commercially.
