Tokyo Solar

Tokyo pays most of the cost of a solar roof this year. Here is your number.

Tokyo, your ward and the national programme each pay a share, and each has its own form and deadline. Set the roof and the battery and the stack adds up, line by line, with the date and source of every figure.

Subsidy calculator

Without a ward, the stack shows Tokyo only.

5 kW

A typical Tokyo roof fits 3 to 6 kW.

10 kWh

0 for no battery. 5 to 10 kWh covers an evening.

House
Options

Without one, payback uses the public price range.

  1. Tokyo, solar¥600,000

    5 kW × ¥120,000 per kW (over 3.75 kW) source

  2. Tokyo, battery¥1,000,000

    10 kWh × ¥100,000 per kWh, capped at ¥1,200,000 without the DR trial source

  3. Nationalnot included

    National programmes (みらいエコ住宅2026, the SII battery scheme) may apply on top of Tokyo. Not yet verified on this site. source

    Not included in the total. Ask the installer to list it on the quote.

Subsidy total

FY2026 (令和8年度). Tokyo figures dated 2026-02-18. 1 line not included.

¥1,600,000

Years to pay back

After subsidy, south-facing roof

Solar only

8.5 yrs

¥900,000 net, saves ¥106,150 a year

Solar + 10 kWh battery

9.7 yrs

¥1,200,000 net, saves ¥124,300 a year

Assumptions, editable

Self-use 30% of generation without a battery, 60% with. Generation 5,500 kWh a year. Costs estimated at ¥300,000 per kW and ¥130,000 per kWh. Panels degrade and prices change; treat this as a first pass, not a forecast.

Two ways to get a real quote. Pick the one that fits your household.

Installers price by roof, not by nationality. The only thing that changes is who answers the phone.

Someone at home can take a call in Japanese

Japanese comparison services send your request to two to five installers and confirm it by phone, in Japanese. If a partner or housemate can take that call, this is the cheapest route to three quotes. Copy this summary and hand it over.

グリエネ Griene450 installers, phone verification in Japanese.ソーラーパートナーズ Solar PartnersAccepts under 10% of installers that apply. Pricing data from 15,000 contracts.

You need the whole thing in English

Tell us the roof and the ward. We pass it to one installer with an English-speaking salesperson who covers Tokyo, and to nobody else. They file the Tokyo pre-application. Reply usually within three working days.

Sending: ward not chosen, 5 kW solar, 10 kWh battery, existing house.

Your details go to the installer and this site only. No list, no resale.

The order matters. Pre-apply, then sign.

Tokyo refuses grants where the contract was signed before the pre-application. Installers who work this market know it. A quote that does not name the pre-application date is the first thing to question.

FY2026 (令和8年度). Ward schemes have their own windows, and about half of them want the application after installation instead.

  1. 1. 2026-02-18

    FY2026 figures announced, pending budget approval.

  2. 2. 2026-05-29

    Pre-application opens. Pre-apply before you sign a contract with an installer.

  3. 3. 2026-06-30

    Grant application and completion report open.

  4. 4. 2026-10-01

    Battery pre-applications from this date must use FY2026 SII-registered products.

  5. 5. 2027-03-31

    Deadline, or earlier if the budget runs out.

Already holding a quote in Japanese?

Type in the total and the system size. See where it sits against public Tokyo prices, and which subsidy lines are missing from it.

Check my quote

Questions people ask before they call anyone

Do I qualify as a foreign resident?
The Tokyo overview sets no nationality condition. The grant goes to the person who owns or lives in the house and pays for the system. The detailed rules are in Japanese; the installer files the forms.
Battery or not?
Tokyo pays ¥100,000 per kWh, which is most of the battery. The case is blackout cover and using your own evening power instead of selling it at ¥16. Compare the two payback figures above with your bill.
What paperwork is involved?
Residence record, building registry extract (建物登記, about ¥200), a bank certificate, the electricity contract, and the pre-application. Most installers file for you; ask before you sign.