Eshi BESS

One of Japan's largest BESS.

Eshi BESS secured a LTDA contract from OCCTO in April 2025.

Project overview

Eshi BESS is a utility-scale 150 MW / 600 MWh lithium-ion battery energy storage system located in Eshi, Okayama Prefecture. It is one of the largest proposed BESS to date in Japan.

With a proposed operational life of 20+ years, the project will provide vital flexibility to enable more renewable energy generation and increase the resilience of the electricity network in Japan.

Eku Energy was awarded in Japan’s long-term decarbonisation power source auction (LTDA) from OCCTO for the four-hour battery storage asset to contribute to the stability of the electricity grid. Eshi BESS is expected to be operational no later than 2030.

Key Facts

Japan
Okayama Prefecture
Storage capactiy -
150 MW / 600 MWh
Current status -
Development
Since

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Project timeline

Current Status
1. Development

The site is selected and we are engaging with the local community to introduce the project and gather feedback before lodging all required studies for Development Approval (DA) by local councils and regulatory bodies.

Current Status
2. Pre-Construction and Financial Close

Once the Development Approval (DA) is received, we negotiate contracts with suppliers and offtakers, and secure financing of the project  ahead of financial close.

Current Status
3. Construction

We mobilise to site for ground-breaking and start building the project.

Current Status
4. Operations

Now the BESS is ready to deliver additional storage capacity to the grid and is managed by a team to ensure it operates as intended.

Current Status
5. Decommissioning

After 20+ years of its intended operational life, the BESS is decommissioned and the site is restored.

Eshi

FAQs

What is the Long-Term Decarbonisation Power Source Auction (LTDA) and who is OCCTO?
What is the Agreement that Eku Energy was awarded by OCCTO?
Has the community been consulted on this project?

If you would like to find out more about what a battery energy storage system is and how they work click here

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