Japan Sets Perovskite Solar Cell Targets for Government Facilities, Aiming for 50-70MW by 2035

Japan's Ministry of the Environment announced new deployment targets for perovskite solar cells at government facilities during an expert panel meeting on June 18, 2026. The government aims to install 50-70MW of perovskite solar capacity by 2035 and 100MW or more by 2040 across facilities under government ownership. These targets are part of a government implementation plan decided in February 2025 and represent a strategic effort to accelerate decarbonization in the public sector.

Perovskite solar cells represent next-generation photovoltaic technology characterized by their lightweight construction and thin profile, enabling installation on surfaces unsuitable for conventional silicon-based panels, such as curved surfaces, walls, and roofs with weight restrictions. The government aims to establish cost competitiveness of 14 yen per kilowatt-hour by 2030 and achieve cost parity of 10-14 yen per kilowatt-hour or lower by 2040. Public sector demand is projected to reach 5-7 gigawatts across the nation, according to the next-generation solar battery strategy.

The Ministry of the Environment plans to lead the effort by creating installation demonstration cases across various government facility types—including administrative offices, social welfare facilities, educational and training centers, and research institutions—beginning in fiscal year 2027. These initial deployments will serve as templates for broader adoption. The government will provide support and guidance to independent administrative institutions and national universities to accelerate their adoption plans.

Recognizing that local municipalities manage significantly more facilities than the national government, the ministry is strengthening support for regional adoption. As of May 20, 2026, 182 municipalities had expressed interest in perovskite solar deployment through the public-private council on next-generation solar battery expansion and industrial competitiveness. The government will assist these municipalities with target-setting, deployment planning, and implementation strategies. Government agencies will also coordinate facility selection, support initial deployment examples, and facilitate technology transfer to municipalities and independent institutions.