Key Findings
The Japanese government has finalized plans to implement fundamental reviews and specific measures concerning key regulations that currently impede the domestic introduction and widespread adoption of next-generation solar cells, including perovskite solar cells, by the end of fiscal year 2026 (March 2027). Three major deregulation efforts are particularly noteworthy:
- Review of Safety Measures for Hazardous Material Facilities: Streamlining regulations concerning trace amounts of lead in perovskite solar cells to align with actual risks.
- Changes to Area Calculation Standards under the Factory Location Act: Acknowledging ‘vertical projection area’ in addition to the conventional horizontal projection area for film-type solar cells installed on factory walls.
- Clarification of BIPV (Building-Integrated Photovoltaics) Design Standards: In cooperation with the Ministry of Land, Infrastructure, Transport and Tourism, clarifying the rules for how BIPV products apply under the Building Standards Act and the Electricity Business Act.
These measures are anticipated to simplify the installation of perovskite solar cells for construction companies and power producers, providing a strong impetus for market expansion.
Technical Details
Currently, perovskite solar cells, due to their lightweight, thin, and flexible properties, are expected to find applications in locations where conventional silicon solar cells are difficult to install, such as building facades, curved roofs, and structures with low load-bearing capacity. However, regulations like the ‘horizontal projection area’ standard for solar power generation equipment under the Factory Location Act were often unsuitable for film-type perovskite solar cells installed vertically. Additionally, BIPV products, possessing aspects of both building materials and power generation equipment, faced regulations under both the Building Standards Act and the Electricity Business Act, leading to complex design and installation processes. This deregulation directly addresses these technical and legal challenges, promoting the adoption of perovskite solar cells in various forms. The review of safety measures aims to reduce unnecessary regulatory burdens while aligning with international safety standards.
Background & Context
Japan must accelerate the introduction of renewable energy to achieve its 2050 carbon neutrality goal and enhance energy self-sufficiency. Solar power is a key pillar, but land availability constraints pose a challenge. Perovskite solar cells are seen as a trump card to solve this issue, and the government also supports R&D through initiatives like the ‘Green Innovation Fund.’ This deregulation represents a policy approach to remove market barriers in parallel with technological development, contributing significantly to Japan’s energy security, decarbonization targets, and improved international competitiveness. Notably, as domestic companies like Sekisui Chemical advance the commercialization of flexible perovskite solar cells, government support is highly timely.
Strategic Significance & Outlook
The implementation of regulatory easing within FY2026 is expected to significantly accelerate the market introduction and diffusion of perovskite solar cells. The BIPV market, in particular, is projected to see substantial growth, potentially promoting adoption not only in factories and commercial facilities but also in general residences. This could lead to a dramatic increase in Japan’s solar power generation capacity and a higher proportion of renewable energy in the energy mix. The government plans to continue reviewing regulations in line with technological innovation and market needs, vigorously promoting the societal implementation of clean energy technologies. This will help Japan solidify its position as a leading clean energy nation and contribute to the global energy transition.
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