Solar subsidy in Hamura, 2026

Hamura (羽村市) pays ¥8,000 per kW, up to ¥80,000 for solar and flat ¥50,000 for a battery, on top of Tokyo. A 5 kW roof with a 10 kWh battery in Hamura stacks to about ¥1,690,000 in FY2026 (令和8年度), of which ¥90,000 is the ward’s share.

Ward or city

FY2026 scheme confirmed, paid in city eco-points.

Solar size5 kW

A typical Tokyo roof fits 3 to 6 kW.

Battery size10 kWh

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

House

Existing houseNew build

OptionsJoin the demand-response trialLifts the ¥1.2M battery cap and adds ¥100,000. Your battery is sometimes controlled remotely.Add V2H (vehicle to home)

Roof faces

Your quote total, if you have one

Without one, payback uses the public price range.

Tokyo, solar¥600,000
5 kW × ¥120,000 per kW (over 3.75 kW) source
Tokyo, battery¥1,000,000
10 kWh × ¥100,000 per kWh, capped at ¥1,200,000 without the DR trial source
Hamura, solar¥40,000
5 kW × ¥8,000 per kW, capped at ¥80,000 source
Paid as city eco-points, not cash. ¥16,000 per kW, cap 150,000 points, with an in-city contractor
Hamura, battery¥50,000
Flat ¥50,000 source
50,000 eco-points when installed with solar; 80,000 with an in-city contractor
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, Hamura figures dated 2026-10-06. 1 line not included.

¥1,690,000

Years to pay back

After subsidy, south-facing roof

Solar only

8.1 yrs

¥860,000 net, saves ¥106,150 a year

Solar + 10 kWh battery

8.9 yrs

¥1,110,000 net, saves ¥124,300 a year

Assumptions, editable

Grid price, ¥ per kWhExport price (FIT), ¥ per kWhYield, kWh per kW per year

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.

東京都羽村市の既存住宅に、太陽光発電 5kW と 蓄電池 10kWhの設置を検討しています。見積もりをお願いします。
東京都の令和8年度補助金（事前申込は契約前に必要）と、区市町村の上乗せ補助を見積書に明記してください。
連絡は電話よりメールが助かります。

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.

What Hamura pays, and when to apply

Solar: ¥8,000 per kW, up to ¥80,000Paid as city eco-points, not cash. ¥16,000 per kW, cap 150,000 points, with an in-city contractor
Battery: Flat ¥50,00050,000 eco-points when installed with solar; 80,000 with an in-city contractor
When to apply: Before the work starts. Like Tokyo, the ward wants the application in before you sign.
Status: FY2026 scheme confirmed, paid in city eco-points.
Source: Solar Partners, Tokyo FY2026 municipal subsidy roundup, 2026-10-06. Not yet checked against the Hamura page.

Tokyo’s calendar

1. 2026-02-18
FY2026 figures announced, pending budget approval.
2. 2026-05-29
Pre-application opens. Pre-apply before you sign a contract with an installer.
3. 2026-06-30
Grant application and completion report open.
4. 2026-10-01
Battery pre-applications from this date must use FY2026 SII-registered products.
5. 2027-03-31
Deadline, or earlier if the budget runs out.