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Grid-scale battery storage projects in Japan
35 projects · 1,230 MW · 4,473 MWh disclosed. Status: Operating 16, Under construction 11, In development 4, Financed 4.
| Project | Sponsor | Location | Size | Status | Revenue | Financing / lenders | Source |
|---|---|---|---|---|---|---|---|
| Gurīn Japan BESS Portfolio Development · COD NPD | Gurīn Energy | Japan portfolio; Phase 1 in Soma, Fukushima | 500 MW / 2,000 MWh | In development | Revenue structure NPD | JPY 91bn investment commitment; debt NPD | ↗ |
| Maibara-Koto Energy Storage Plant Scheduled 2027 | ORIX | Maibara, Shiga | 134 MW / 548 MWh | Under construction | LTDA · 20-year fixed income in principle | Financing amount NPD | ↗ |
| Yonezawa Energy Storage Plant Construction · 2030 | ORIX + 3 external investors | Yonezawa, Yamagata | 75 MW / 309 MWh | Under construction | Revenue structure NPD | External equity; debt NPD | ↗ |
| Yufu Energy Storage Plant Construction · 2028 | ORIX + 3 external investors | Yufu, Oita | 70 MW / 280 MWh | Under construction | Revenue structure NPD | External equity; debt NPD | ↗ |
| Sumitomo Namie BESS Target COD 2029 | Sumitomo Corporation (via BS Holdings, 100% subsidiary) | Namie, Fukushima | 62 MW / 291 MWh | Under construction | Selected in the Long-Term Decarbonization Power Source Auction (launched 2024) | Project financing arranged by major Japanese financial institutions Major Japanese financial institutions | ↗ |
| Nozu BESS Financial close · target Q3 2028 | Nozomi Energy / Actis | Nozu, Usuki, Oita | 50 MW / 196 MWh | Financed | FY2023 LTDA · 20-year CPI-linked | Non-recourse PF; amount NPD Aozora | ↗ |
| Helios BESS Operating in power markets | HD Renewable Energy | Hokkaido | 50 MW | Operating | Merchant · JEPX / EPRX / capacity | JPY 5.4bn green project bond · up to 19 years Nomura Capital Investment, Nomura Securities | ↗ |
| Kinokawa Energy Storage Plant Operating · Dec 2024 | ORIX / KEPCO (50:50) | Kinokawa, Wakayama | 48 MW / 113 MWh | Operating | Power-market trading · E-Flow | JV equity; debt NPD | ↗ |
| SUNPIN SP Shiga Otsu Storage Station Grid-connected Nov 2026 · Target COD Dec 2026 | SUNPIN JAPAN (EPC: Bluepoint Power Solution; operation: E-Flow) | Ishiyama-sencho, Otsu, Shiga | 45 MW / 180 MWh | Under construction | Revenue structure NPD | Financing NPD | ↗ |
| Hirohara BESS Construction · early 2027 | Eku Energy | Miyazaki City, Miyazaki | 30 MW / 120 MWh | Under construction | Tokyo Gas 20-year operating rights | Project finance; amount NPD MUFG | ↗ |
| Tagawa BESS Financed · COD NPD | Hexa Energy Services | Tagawa, Fukuoka | 30 MW / 130 MWh | Financed | LTDA · FY2023 | Project finance; amount NPD MUFG, Société Générale | ↗ |
| Ishikari Energy Storage Facility Planned FY2027 | RENOVA / SMFL MIRAI Partners | Ishikari, Hokkaido | 30 MW | Financed | Tokyo Gas 20-year offtake | Approx. JPY 5bn project finance MUFG | ↗ |
| Mimasaka BESS Financed · COD NPD | Kingdom / Stonepeak | Mimasaka, Okayama | 29 MW | Financed | LTDA · 20-year capacity contract | Long-term PF; amount NPD MUFG | ↗ |
| Ecokaku 11-Site Grid BESS Portfolio Partly operating · as of 4 Nov 2026: 3 sites operating, 7 in test operation, 1 grid-connected | エコ革 (Ecokaku) | 11 sites in 6 prefectures, Japan: Tochigi (Tochigi City, Kanuma), Saitama (Fukaya, Hiki District, Kumagaya), Chiba (Isumi), Gifu (Ena), Tottori (Sakaiminato), plus 1 undisclosed | 21.9 MW / 82.7 MWh | Under construction | Revenue structure NPD | Financing NPD | ↗ |
| Denki no Eki Isahaya BESS Target COD Dec 2028 (preparatory works began Oct 2026) | でんきの駅 (JV: JR Kyushu, BS Holdings [Sumitomo Corp.], Sumitomo Corporation Kyushu) | Isahaya, Nagasaki (former JR Kyushu railway substation site) | 16 MW / 70 MWh | Under construction | Revenue structure NPD | Financing NPD | ↗ |
| Pacifico Koganai ESS Operating · Dec 2025 | Pacifico Energy | Tokyo power area | 2 MW / 10 MWh | Operating | Full merchant · wholesale / balancing / capacity | Fully self-funded | ↗ |
| Kitsuki BESS Operating · disclosed Oct 2026 | Owner NPD (CHINT Power system) | Kitsuki, Oita | 2 MW / 8 MWh | Operating | Arbitrage + frequency regulation | Financing NPD | ↗ |
| Shinidemitsu Nagasu BESS Operating · Nov 2026 (completed Oct 2026) | 新出光 (Shinidemitsu) | Nagasu, Tamana District, Kumamoto | 2 MW / 8 MWh | Operating | Revenue structure NPD | METI grid-scale battery subsidy (FY2024); debt NPD | ↗ |
| TAOKE Minamichita 2MW Storage Station Grid-connected · Oct 2026 (commercial operation date NPD) | TAOKE ENERGY (developer); to be handed over to BT Holding | Minamichita, Chita District, Aichi Prefecture | 2 MW / 8.1 MWh | Under construction | Power-market trading via EMS (contracts NPD) | Financing NPD; handover to BT Holding after test run | ↗ |
| Keiyo Gas Isesaki Grid BESS Operating · Oct 2026 | KG BESS LLC (Keiyo Gas / Keiyo Gas Real Estate); developer-builder: Sunvillage | Kamiueki-honmachi, Isesaki, Gunma | 2 MW / 8 MWh | Operating | Wholesale (JEPX), balancing and capacity markets; aggregator Marubeni Power Retail | Financing NPD | ↗ |
| Teshikaga Storage Station (Buddynet) Completed · Sep 2026 (grid-connected) | 所有者非開示 / Owner NPD (developed & built by Buddynet バディネット) | Teshikaga, Kawakami District, Hokkaido | 2 MW / 8 MWh | Operating | Revenue structure NPD | Financing NPD | ↗ |
| Nisshin LRD Storage Station (Fujinomiya) Completed · Sep 2026 (grid-connected) | 所有者非開示 / Owner NPD (built by Buddynet バディネット) | Fujinomiya, Shizuoka | 2 MW / 8 MWh | Operating | Revenue structure NPD | Financing NPD | ↗ |
| Nagano No.5 Storage Station (Saku) Completed · Oct 2026 (grid-connected) | 所有者非開示 / Owner NPD (built by Buddynet バディネット) | Saku, Nagano | 2 MW / 8 MWh | Operating | Revenue structure NPD | Financing NPD | ↗ |
| ADW Miyazaki Nichinan Storage Station Operating · Nov 2026 | 株式会社エー・ディー・ワークス (A.D.Works, ADWorks Group) | Nichinan, Miyazaki Prefecture | 2 MW / 8 MWh | Operating | Wholesale market trading; balancing market entry planned around Feb 2027 | Financing NPD | ↗ |
| NC Tottori City Ketakacho No. 2 Power Storage Station Operating · Grid connected Jun 2026 | Remixpoint | Ketakacho, Tottori City, Tottori Prefecture, Japan | 2 MW / 8.3 MWh | Operating | Balancing market (participating since 28 Oct 2026); expected revenue about ¥15M per month | NPD | ↗ |
| Kasama Gymnasium-Adjacent BESS Operating · Oct 2026 | Kasama City / Fuyo General Lease / TEPCO Town Planning | Adjacent to Kasama Citizens' Gymnasium, Kasama City, Ibaraki Prefecture, Japan | 2 MW / 8 MWh | Operating | Power market trading in normal times (market NPD); free supply to Kasama Citizens' Gymnasium in disasters | NPD | ↗ |
| Kyotango 2MW Grid BESS Not publicly disclosed | 未公开 / NPD / 非開示 (works contractor: Green Energy Plus) | Kyotango, Kyoto | 2.0 MW / 8.1 MWh | In development | Revenue structure NPD | Financing NPD | ↗ |
| Musashi-Ranzan Storage Station (Shiga, Ranzan, Saitama) Completed Jun 2026, handed over; COD NPD | Enblue (developer/seller); owner not disclosed | 1872-1 Shiga, Ranzan, Hiki District, Saitama | 2.0 MW / 8.1 MWh | Under construction | Revenue structure NPD | Financing NPD | ↗ |
| NC Kainan Kizu Storage Station Operating · Nov 2026 | 日本蓄電池株式会社 / リミックスポイント（共同組成ファンド） | Kainan, Wakayama | 2.0 MW / 8.1 MWh | Operating | Planned: balancing market, JEPX and capacity market | Fund jointly formed by Nihon Chikudenchi and Remixpoint; lender NPD | ↗ |
| NC Makurazaki Sakurayama-Higashimachi Storage Station Energised · Nov 2026 (commercial operation date NPD) | 日本蓄電池 Nippon Chikudenchi (fund jointly formed with Remixpoint); EPC: 鹿栄電設 | Makurazaki, Kagoshima Prefecture | 2.0 MW / 8.1 MWh | Under construction | Balancing market, JEPX wholesale, capacity market, renewable smoothing (contracts NPD) | Developed via fund jointly formed with Remixpoint; lenders NPD | ↗ |
| NC Karatsu Hamatama-machi Hamasaki Storage Station Operating · Nov 2026 (balancing market from 6 Nov 2026) | 日本蓄電池 (Nippon Chikudenchi); aggregator Digital Grid; business management Remix Point | Hamatama-machi Hamasaki, Karatsu, Saga Prefecture | 2.0 MW / 8.1 MWh | Operating | Balancing market (aggregator: Digital Grid) | NPD | ↗ |
| Tadasu-no-Mori Kani BESS Not publicly disclosed | 糺の森 (Tadasu-no-Mori) | Kani, Gifu | 1.9 MW / 6.2 MWh | In development | Revenue structure NPD | Financing NPD | ↗ |
| SD Ayabe Storage Station Operating · Sep 2026 | 綜電 (Soden) | Ayabe, Kyoto | 1.9 MW / 8.1 MWh | Operating | Aggregator: Sustech (ELIC platform) | Financing NPD | ↗ |
| SD Fukuchiyama Storage Station Operating · Sep 2026 | 綜電 (Soden) | Fukuchiyama, Kyoto | 1.9 MW / 8.1 MWh | Operating | Aggregator: Sustech (ELIC platform) | Financing NPD | ↗ |
| Ami Daini 2MW Storage Station (Star Seeds, Ami, Ibaraki) Grid connection planned Jul 2027 (construction completion Apr 2027) | Star Seeds (acquiring from developer Wintec) | Ami, Inashiki District, Ibaraki Prefecture, Japan | 1.9 MW | In development | NPD | NPD (acquisition price not disclosed) | ↗ |
Disclosed lenders in Japan
MUFG (4) · Major Japanese financial institutions (1) · Aozora (1) · Nomura Capital Investment (1) · Nomura Securities (1) · Société Générale (1)
Latest Japan news
- 10 Nov 2026Sunpin Japan connects its first utility-scale battery, 45 MW/180 MWh in Otsu, Shiga, with December operation via E-Flow
- 10 Nov 2026Eco Kaku: 11 grid batteries across Japan now interconnected, 3 operating, about 21.9 MW in total
- 10 Nov 2026RENON POWER's low-voltage grid battery orders pass 1,500 sites, about 75 MW/300 MWh on its own conversion
- 9 Nov 2026A.D.Works completes its third operating grid battery, about 2 MW/8 MWh in Nichinan, Miyazaki
- 6 Nov 2026Tokyo Gas: grid-scale battery capacity planned for operation reaches about 1.1 GW, targets 2 GW in early 2030s
- 6 Nov 2026Digital Grid's grid-scale battery volume passes 250 MW, up 50 MW in about a month
- 4 Nov 2026JR Kyushu and Sumitomo Corp to build 16 MW/70 MWh battery in Isahaya, Nagasaki, for Dec 2028 operation
- 30 Oct 2026Chugoku Electric and JR West sign MOU to study joint battery storage business
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