In order to build a carbon-free society, Tokyo is promoting the insulation and use of renewable energy in rental housing, which accounts for approximately 50% of all housing in Tokyo.
METI hereby announces that it will begin accepting registrations of businesses that will provide financial support for energy-saving performance diagnosis and insulation renovations for rental housing, as well as for the use of renewable energy through bulk low-voltage electricity reception.

Business overview

1）Energy-saving performance diagnosis and insulation renovation (existing homes)

For rental housing, subsidies will be provided for the expenses related to the diagnosis, renovation, etc., when performance information based on energy-saving performance diagnosis is displayed in real estate advertisements, etc., and when renovations are carried out to ensure a certain level of insulation performance based on the diagnosis results.

2）Introduction of renewable energy (new and existing homes)

For rental housing, subsidies will be provided for the expenses related to solar power generation equipment and ancillary equipment for low-voltage electricity bulk reception, provided that renewable energy electricity is supplied to each residence through a combination of solar power generation and low-voltage electricity bulk reception.

Grant amount etc.

1）Energy-saving performance diagnosis and insulation renovation

Grant target	Subsidy rate	Upper limit	Requirements
Highly insulated windows	2/3	300,000 yen/house	The product must be registered as eligible for subsidies under the national Carbon Dioxide Emissions Reduction Project Subsidy or the Decarbonization Industry Growth Promotion Subsidy.
High insulation door	2/3	270,000 yen/house	・Thermal conductivity must be less than 2.9 watts per square meter Kelvin ・When installed in conjunction with window or insulation renovations, etc.
Insulation repairs to walls and floors	2/3	600,000 yen/house	The product must be registered as eligible for subsidies under the national Carbon Dioxide Emissions Reduction Measures Subsidy Program or the Childrearing Green Housing Support Program.
Creating current status diagrams for energy conservation diagnosis	10/10	100,000 yen/household	Creating current house drawings to be used when conducting energy conservation diagnosis, etc.
Energy saving performance diagnosis and display	10/10	1.2 million yen/building	・It evaluates the energy consumption performance and envelope performance of a house. ・Displaying the energy consumption performance of buildings, etc.

2）Introduction of renewable energy

Grant target	Subsidy unit price	Upper limit	Requirements
Solar power generation equipment (new construction)	3.6 kilowatts or less		・The electricity supplied by the solar power generation system can be used in all units of the rental housing in which the solar power generation system is installed. ・It must be newly installed in a rental property or on the premises within Tokyo.
	180,000 yen/kilowatt	540,000 yen
	Over 3.6 kilowatts and under 50 kilowatts
	150,000 yen/kilowatt	－
Solar power generation facility (existing)	3.75 kilowatts or less
	300,000 yen/kilowatt	900,000 yen
	Over 3.75 kilowatts and less than 50 kilowatts
	240,000 yen/kilowatt	－
Functional PV addition	According to the classification of functionality	Maximum 80,000 yen/kilowatt	Corresponds to the classification of functionality stipulated in the standards for photovoltaic power generation systems with excellent functionality
Mounting installation top-up	200,000 yen/kilowatt	Power output less than 50 kilowatts	Limited to installation on flat roofs of rental housing, etc.
Waterproofing work top-up	180,000 yen/kilowatt		Limited to installation on flat roofs of existing rental housing, etc.
Electricity meter	70,000 yen/house	－	The electricity meter must have been inspected in accordance with the Measurement Act, etc.
Data collection device	100,000 yen/building	－	・It must be linked to a solar power generation system. ・Ability to provide electricity data to the Tokyo Metropolitan Government and Cool Net Tokyo, etc.
Storage battery system	120,000 yen/kilowatt-hour	2.16 million yen/building	Those used for energy utilization in residential areas, etc.

Business registration period

May 29, 2025 – February 27, 2026
*In order to undertake the subsidized projects for energy-saving performance diagnosis, insulation renovation, and renewable energy introduction, you must register with the Tokyo Metropolitan Climate Change Action Center (Cool Net Tokyo), a public interest incorporated foundation run by the Tokyo Metropolitan Environmental Public Corporation.

Grant recipients

1）Energy-saving performance diagnosis and insulation renovation

Owner of a rental property that will undergo energy-saving performance diagnosis and insulation renovation, etc.

2）Introduction of renewable energy

Owners of rental housing that will introduce low-voltage bulk electricity supply, etc.
*In order for energy-saving performance diagnosis, insulation renovations, and renewable energy introduction to be eligible for subsidies under this program, they must be carried out by a business operator registered with the Tokyo Metropolitan Climate Change Action Center (Cool Net Tokyo), a public interest incorporated foundation run by Tokyo Metropolitan Environmental Public Corporation.

Grant application period

June 26, 2025 (scheduled) – March 31, 2026 (ends when the total amount of applications reaches the budget)

Budget amount

Approximately 19.9 billion yen

Application reception desk

Cool Net Tokyo (link is external)

This project is an initiative to promote the “Tokyo 2050 Strategy.”
Strategy 20: Zero-emission “Maximizing energy efficiency”

Contact: (Overview of the business system) Environment Bureau, Climate Change Department, Household Energy Policy Division Phone: 03-5388-3709 (Regarding business registration and application acceptance) Tokyo Metropolitan Environmental Public Corporation Tokyo Metropolitan Government Global Warming Prevention Activity Promotion Center (Cool Net Tokyo) Phone: 03-6258-5317