Air Solar Social Implementation Promotion Project

Tokyo is promoting efforts to realize a decarbonized society and ensure a stable supply of energy, based on the key phrase “(H) reduce (T) create (T) store” for electricity.
As part of this initiative, we are implementing the “Air Solar Social Implementation Promotion Project,” which subsidizes part of the demonstration costs for developers of “Air Solar*,” a solar cell developed in Japan that is characterized by being “thin, light, and flexible,” in order to commercialize the technology.
We are pleased to announce that the subsidy recipients have been selected. We are still accepting applications for subsidy recipients for this project.

[Note] About Air Solar
These solar cells use a crystalline structure called perovskite. Compared to silicon solar cells, they have the following features and are expected to be highly competitive with silicon solar cells.

• 1）Being “thin, light and flexible” allows for a wider range of installation locations
• 2）Development of manufacturing technology may lead to mass production and lower manufacturing costs.
• 3）In addition to being a technology originating in Japan, approximately 30% of the world’s iodine, the main raw material, is produced domestically in Japan.

Subsidized businesses

Tokyo Gas Co., Ltd., Iida Group Holdings Co., Ltd., Macnica Inc., Reiko Co., Ltd.

Business overview

Install Air Solar in a model house to verify operation and evaluate installation methods.

• Verification on a vertical wall (pseudo wall)
• Verification on the balcony
• Verification on indoor walls
• Verification on windows (adhesive method, window frame fixing method)
• Verification of installation methods that allow for easy installation and replacement in homes

Installation location

Model house in Hino city

Business period

January 2026 to December 2026 (planned)

About the Air Solar Social Implementation Promotion Project

Business overview

In order to quickly commercialize Air Solar, we aim to accelerate its social implementation by subsidizing part of the costs of demonstration projects carried out by development companies.

Requirements for eligible projects

• Taking into account the regional characteristics of Tokyo, identify issues and verify the effectiveness of Air Solar in Tokyo.
• Those who plan to continue to utilize the results of the subsidized project in Tokyo and work towards early social implementation in Tokyo, etc.

Grant amount

Two-thirds of the costs required for the demonstration project (survey and design costs, equipment costs, construction costs, etc.) (maximum amount: 40 million yen)

Application period

April 1, 2025 – March 31, 2026 (ends when the total amount of applications reaches the budget)

Budget amount

120 million yen

Application reception desk

Tokyo Metropolitan Environmental Public Corporation, Tokyo Metropolitan Center for Global Warming Prevention Activities (Cool Net Tokyo)

Business website

Website (link to external site)

This project is an initiative to promote the “Tokyo 2050 Strategy.”
Strategy 20: Zero-emission “Making renewable energy a core energy source”

Contact: (Matters related to subsidy systems) Climate Change Department, Planning Division, Environment Bureau Phone: 03-5388-3524 (Regarding application acceptance) Tokyo Metropolitan Environmental Public Corporation, Public Interest Incorporated Foundation, Tokyo Metropolitan Global Warming Prevention Activities Promotion Center (Cool Net Tokyo) Phone: 03-6258-5313