In Tokyo, we are promoting initiatives to realize a decarbonized society and ensure a stable energy supply, using the HTT (H: Reduce, T: Generate, T: Store) principles for electricity. We would like to inform you that we will provide support to development companies for the practical application of “Air Solar ^[Note]“, a Japanese-made solar cell characterized by being “thin, light, and flexible”.

[Note] About air solar

This is a solar cell that uses a crystal structure called perovskite.
Compared to silicon-based solar cells, they possess the following characteristics and are expected to be highly competitive against silicon-based solar cells.

• 1）Because it is “thin, light, and flexible,” the range of places where it can be installed is wide.
• 2）Development of manufacturing technology has the potential to enable mass production and reduce manufacturing costs.
• 3）In addition to being a technology originating in Japan, approximately 30% of the world’s iodine production comes from Japan.

Business overview

To accelerate the practical application of air solar technology, we will subsidize a portion of the costs of demonstration projects conducted by development companies, thereby promoting its social implementation.

Requirements for projects eligible for subsidies

• Based on the regional characteristics of Tokyo, this project aims to identify challenges and verify the effectiveness of promoting the widespread adoption of air solar power within the city.
• Projects that continue to utilize the results of the grant-funded project within Tokyo and have plans to work toward early social implementation within Tokyo, etc.

Grant amount

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

Application period

April 1, 2026 – March 31, 2027 (Ends when the total amount of applications reaches the upper limit)

Budget amount

120 million yen

Application reception desk

(Public Interest Incorporated Foundation) Tokyo Metropolitan Environmental Public Corporation, Tokyo Center for Promoting Activities to Prevent Global Warming (Cool Net Tokyo)

Business website

Business website (link to external site)

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

Contact: (Regarding grant programs) Environmental Bureau, Climate Change Countermeasures Department, Planning Division Phone: 03-5388-3524 (Regarding application acceptance) Tokyo Metropolitan Environmental Public Corporation, Tokyo Center for Global Warming Prevention Activities (Cool Net Tokyo)） Phone: 03-6258-5313