Japan’s Ministry of the Environment (MOE) has launched two subsidy programs designed to promote the adoption of perovskite solar cells and enhance battery storage integration. Applications for these initiatives opened on September 4, 2025, with deadlines set for early October. Reports indicate that the subsidies could cover up to 75% of the costs associated with the procurement and installation of perovskite solar modules, with additional support for facilities designated as emergency evacuation centers.
The first program, aimed at fostering social implementation models for perovskite solar technology, is part of the fiscal 2025 subsidies for decarbonization and economic transition. It is specifically focused on locations ideal for scalable setups, particularly areas with high energy self-consumption or those near significant demand points. To qualify, projects must employ film-type perovskite cells, produce a minimum of 5 kW per installation, and be situated at sites with a load limit of 10 kg/m² or less. Local governments, private enterprises, and relevant organizations are eligible to apply, with a closing date of October 3, 2025.
The second initiative, the fiscal 2025 emission reduction subsidy for private renewable ventures, aims to facilitate cost reductions for solar systems by incentivizing the integration of battery storage alongside perovskite deployments. Eligible applicants must incorporate energy storage solutions in their projects. Private businesses and organizations can submit applications until October 7, 2025, at noon JST. Japan has set an ambitious goal of achieving 20 GW of perovskite solar capacity by 2040, leveraging advancements in flexible tandem cells and innovative manufacturing techniques. Ongoing industry trials are exploring lightweight PV modules for roofs unsuitable for standard panels, while the government is also investing in research and development of solid-state batteries. Recent analyses highlight the potential economic benefits of solar-plus-storage systems enhanced with heat pumps across various regions.