Japan’s Rooftop Solar Mandates Drive Rooftop PV Market Growth from $2.9 Billion Toward 2035

Japan rooftop solar panel market reached $2.9 billion in 2025 and is expected to expand to $6.0 billion by 2035, registering a CAGR of 7.6% over the 2026–2035 period. Japan’s rooftop solar segment is gaining traction as government policy shifts and local mandates strengthen demand for rooftop photovoltaic (PV) systems. Urban centers like Tokyo are leading with regulations that require solar panels on newly built homes, positioning rooftop installations as a central element of distributed energy expansion and carbon reduction efforts. This regulatory push is creating clearer incentives for developers and builders to integrate rooftop solar into residential projects while supporting broader national goals for renewable energy growth and grid decarbonization.

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According to the data from the Tokyo Metropolitan Government, rooftop solar penetration in major cities is still emerging, but policy is shaping future adoption. As of the latest data, only about 4% of suitable buildings in Tokyo currently have solar generation equipment installed on their rooftops, indicating significant room for growth. Under a Tokyo Metropolitan Government mandate effective April?2025, solar panels will be required on new detached homes and residential buildings, a first for any Japanese city and a policy expected to increase rooftop solar uptake markedly compared with current levels.

Japan’s Rooftop Solar Market Grows with New Investments

• In December 2025, Virya Energy entered Japan’s renewable power sector by acquiring BayWa r.e.’s Japan solar platform and team, reinforcing its focus on supplying green power to large corporate clients.

• In November 2025, Japan Benex Corporation commissioned a 4.3-MWdc rooftop solar array, Benex Sakai-Koga Solar Port, in Ibaraki prefecture, the largest rooftop PV system owned by the company, installed on the LF Sakai-Koga logistics facility developed by Cushman & Wakefield Asset Management.

• In August 2025, Cool Intelligence Co., Ltd. (Tokyo) announced plans to sell ultralightweight flexible solar panels from Apollo Power (Israel) in Japan, designed for roofs with weight restrictions or unique structures, addressing renewable energy mandates and cost-efficiency goals.

• In September 2024, DAS Solar hosted a Japan New Product Launch and Customer Day in Tokyo, introducing lightweight N-type PV modules. Denkosha launched the "flexible solar G+" initiative for rooftop installations with weight or shape constraints, ensuring durable and safe systems.

Market Coverage

• The market number available for – 2025-2035
• Base year- 2025
• Forecast period- 2026-2035
• Segment Covered-
  • Type
  • End User
• Competitive Landscape – JinkoSolar Holding Co., Ltd., Kyocera Corp., Mitsubishi Electric Corp., Panasonic Corp., Sharp Corp., among others.

Key questions addressed by the report.

• What is the market growth rate?
• Which segment and region dominate the market in the base year?
• Which segment and region will project the fastest growth in the market?
• Who is the leader in the market?
• How are players addressing challenges to sustain growth?
• Where is the investment opportunity?

Japan Rooftop Solar Panel Market Report Segment

By Type

• Monocrystalline Silicon
• Polycrystalline Silicon
• Thin-Film
  • Amorphous Silicon (a-Si)
  • Cadmium Telluride (CdTe)
  • Copper Indium Gallium Selenide (CIGS)
• Others

By End-User

• Household Sector
• Corporate Sector

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