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According to a report by pv magazine, Japan’s New Energy and Industrial Technology Development Organization has released new design and construction guidelines for photovoltaic systems using flexible solar cells. The guidelines cover technologies including perovskite, chalcopyrite, and thin crystalline silicon.
The publication addresses structural load design, frameless mounting methods, and flammability considerations for systems mounted on buildings. NEDO developed the guidelines with input from several national institutes and an industry association. The move responds to a scarcity of suitable sites for conventional solar installations across Japan, which already has high solar capacity per land area.
Flexible and lightweight cells are intended for use on low-load rooftops and building walls where traditional panels are not viable. Past damage from severe weather events has raised community concerns about solar equipment safety, which the guidelines aim to help mitigate. The guidelines are presented as a consolidated reference for project developers and designers as commercial deployment of these technologies advances.
The guidelines apply only to building-mounted systems and explicitly exclude livestock facilities, horticultural structures, and indoor installations. Evaluations for wind and snow load structural safety, along with certain electrical safety tests, have not been finalized. A revised edition of the guidelines is anticipated by the end of fiscal year 2027.
This initiative follows Japan’s Seventh Strategic Energy Plan, which emphasized maximum renewable energy deployment while managing land-use and community constraints. The country has set a target for perovskite solar capacity by 2040. In the previous year, the Ministry of the Environment opened subsidy applications for programs promoting early perovskite deployment, with criteria including specific load capacities and battery integration.
Also in the previous year, NEDO launched a multi-year research and development program under the Green Innovation Fund to advance mass production technologies for tandem perovskite solar cells. In mid-2025, a one-year grid-connected trial of chalcopyrite solar panels began on an industrial building. The company behind the modules has secured funding for a planned manufacturing facility and is separately developing tandem cell technology.
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