Don't waste it.
Store it.
We capture surplus renewable energy and release it when the grid needs it most, building the foundation for Japan's energy independence.
Meet us at RE+ 2026
RE+ 2026, North America’s largest clean energy event, will take place November 16–19, 2026 at the Las Vegas Convention Center. Visit us at Booth C8403 to talk about grid-scale battery storage in Japan.
The problem: Clean power is going to waste
Japan is adding renewable power fast. But when the sun is shining and the wind is strong, the grid can't always use it all. So operators curtail it – turning clean generation off when it's needed most, even as Japan continues to rely on imported fuel.
Surplus solar
Renewables generate more power than the grid can absorb.
Captured when it's available
Grid-scale batteries absorb surplus renewable energy before it's curtailed – saving it for when the grid needs it.
Released at peak
Stored power flows back to homes and industry when it's needed.
So how can grid-scale batteries help?
Store the midday sun. Deliver at evening peak.
Solar peaks around midday. Electricity demand often peaks later, when the sun is going down and into evening. A grid-scale battery bridges the gap; charge when clean power is abundant, discharge when demand is high. The result? Less curtailment. Lower peak demand. More renewable power delivered.
Solar peaks at midday
The sun determines when solar produces, not when it’s needed.
The battery captures the surplus
Instead of letting excess renewable power go to waste, the battery charges when supply exceeds demand.
Power when the grid needs it
As the sun sets and demand rises, stored energy flows back into the grid.
Turn surplus into supply.
Capture it at noon, put it to work at peak.
Fast, reliable, end-to-end delivery.
From securing land to construction, operation, grid-connection filings and long-term decarbonization auctions. We handle the entire project under one roof. Backed by domestic capital, we close fast and move with certainty.
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Zero renewable waste. Real energy independence.
Japan imports nearly all of its energy. By storing the clean power we already generate and supplying it on demand, we cut that dependence and accelerate decarbonization, building energy infrastructure the country can rely on.
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The scale we're building toward.
Projects the length of Japan.
From Tohoku to Kyushu, we deliver turnkey, grid-scale storage assets across Japan. Sites secured. Interconnection filed. Ready to deploy.
Green Battery in motion.
Latest updates.
Frequently asked questions.
What does Green Battery do?
Green Battery Inc. is a Tokyo-based company that develops, builds, operates and sells grid-scale battery energy storage systems (BESS) in Japan. Our batteries capture surplus solar and wind power that would otherwise be curtailed, then supply it back to the grid when demand peaks in the evening.
What is grid-scale battery storage, and why does Japan need it?
Grid-scale battery storage is a large battery facility connected directly to the power grid. It charges when renewable generation exceeds demand and discharges when demand is high. Japan relies on imports for about 99% of its primary energy, yet around 8.5 TWh of clean electricity is curtailed every year because the grid cannot absorb it at the moment it is generated. Storage turns that wasted power into firm, dispatchable supply. Read our vision.
What services does Green Battery provide?
We deliver storage projects end to end under one team: site acquisition and screening, system engineering, grid-interconnection applications and permitting (including Japan’s Long-Term Decarbonization Auction), procurement and construction with Tier-1 technology partners, and long-term operation and asset management. See our services.
Where are Green Battery’s projects located?
Our development pipeline spans four regional grids: Tohoku, Tokyo (Kanto), Chugoku and Kyushu. As of September 2026 it includes 396 grid-interconnection applications (28 extra-high-voltage and 368 high-voltage). View projects & pipeline.
Can I acquire or invest in a grid-scale storage project?
Yes. We currently have grid-connection-ready projects available for this fiscal year. Detailed specifications, capacity and commercial terms are shared with qualified partners on request. Contact us about investment.
I own land. Could it host a battery storage project?
Possibly. We screen sites early for grid-interconnection, zoning and permitting feasibility, and we work with landowners from the first conversation through construction. Tell us about your land.
How does Green Battery keep battery storage sites safe?
Every site uses layered protection: battery management systems that monitor cell voltage and temperature 24/7, built-in heat, smoke and off-gas detection linked to automatic suppression, coordination with local fire services before power-up, generous setbacks, low-noise equipment, and round-the-clock remote monitoring. Learn about safety & community.
Where is Green Battery based?
Our head office is at 7F, ICON PLACE SHIBAKOEN, 3-2-18 Shiba, Minato-ku, Tokyo, with branches in Sendai (Tohoku) and Fukuoka (Kyushu). We have about 50 employees and are a member of the Battery Business Association. Company profile.
Building the energy foundation for Japan's future.
We currently have grid-connection-ready projects available. Reach out to explore partnership and investment opportunities.