Tokyo Solar

All wards and cities

Solar subsidy in Ota, 2026

Ota (大田区) pays up to ¥200,000 for solar and ¥100,000 per kWh, up to ¥200,000 for a battery, on top of Tokyo. A 5 kW roof with a 10 kWh battery in Ota stacks to about ¥1,800,000 in FY2026 (令和8年度), of which ¥200,000 is the ward’s share.

FY2026 scheme confirmed. In-ward contractor required.

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. Ota, solarnot included

    Up to ¥200,000, formula not published source

    In-ward contractor required. The per-kW figure on the roundup looks like a misprint; confirm with the ward.

  4. Ota, battery¥200,000

    10 kWh × ¥100,000 per kWh, capped at ¥200,000 source

    Shares a ¥200,000 cap with solar

  5. 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, Ota figures dated 2026-10-06. 2 lines not included.

¥1,800,000

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

8 yrs

¥1,000,000 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: Ota, 5 kW solar, 10 kWh battery, existing house.

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

What Ota pays, and when to apply

Solar
Up to ¥200,000In-ward contractor required. The per-kW figure on the roundup looks like a misprint; confirm with the ward.
Battery
¥100,000 per kWh, up to ¥200,000Shares a ¥200,000 cap with solar
When to apply
Before the work starts. Like Tokyo, the ward wants the application in before you sign.
Status
FY2026 scheme confirmed. In-ward contractor required.
Source
Solar Partners, Tokyo FY2026 municipal subsidy roundup, 2026-10-06. Not yet checked against the Ota page.

Tokyo’s calendar

  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.

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