HEXA Energy Services G.K. has announced the development of a 50 MWac grid-scale battery energy storage facility in Oyabe City, Toyama Prefecture, Japan, with commercial operations scheduled to begin in May 2028.
The company held a joint press conference with Oyabe City on October 8, 2026, to outline the HEXA Oyabe Battery Energy Storage Facility and its role in supporting renewable energy integration and electricity grid stability in the Hokuriku region.
The project is being developed in the Ishinada area of Oyabe City and was selected in the first round of Japan’s Long-Term Decarbonization Power Source Auction, introduced by the Ministry of Economy, Trade and Industry in fiscal 2023.
The battery storage facility is expected to charge during periods when renewable power generation, including solar power, exceeds electricity demand and discharge when supply is constrained. This operating model is intended to improve the utilization of renewable energy and provide balancing capacity to the regional power grid.
Project Details
- Project: HEXA Oyabe Battery Energy Storage Facility
- Location: Ishinada, Oyabe City, Toyama Prefecture, Japan
- Grid Connection Capacity: 50 MWac
- Scheduled Commercial Operations: May 2028
- EPC Partner: Shirokuma Power Co., Ltd.
HEXA previously held a groundbreaking ceremony for the project on September 6, 2026. Representatives from the local community, Shirokuma Power, which is responsible for the balance-of-plant EPC works, and HEXA attended the ceremony.
The company said safety and environmental considerations will remain key priorities during construction and operation. HEXA plans to establish multiple layers of safety measures and an operational management framework while continuing discussions with Oyabe City and local residents.
Oyabe City declared itself a Zero Carbon City in December 2021. The city government has expressed expectations that the battery storage project will contribute to regional decarbonization and strengthen local energy infrastructure.
HEXA has secured a total of 13 projects through Japan’s fiscal 2023 and fiscal 2025 Long-Term Decarbonization Power Source Auctions, including the Oyabe project. The company is focused on developing renewable energy and grid-scale battery storage assets to support Japan’s target of achieving carbon neutrality by 2050.
HEXA Energy Services was established in April 2023 and is wholly owned by I Squared Capital, a US-based infrastructure investment manager. The company invests in, develops and operates renewable energy assets, including grid-scale battery energy storage systems, in Japan.
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