Wins Two Grid-Scale Battery Storage Projects in FY2025 Long-Term Decarbonization Power Source Auction
Hexa Energy Services LLC, which develops grid-scale battery storage projects to promote renewable energy and stabilize the grid, has won two projects totaling 90,470 kW in the FY2025 Long-Term Decarbonization Power Source Auction.
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- 📰 Published: May 15, 2026 at 00:41
- 🔍 Collected: May 14, 2026 at 16:02
- 🤖 AI Analyzed: May 14, 2026 at 17:34 (1h 32m after Collected)
Hexa Energy Services LLC (Headquarters: Chiyoda-ku, Tokyo; Executive Officers: Yuko Shah, Yoichiro Mizuta; hereinafter "the Company"), which develops grid-scale battery storage projects to promote the further introduction of renewable energy and ensure grid stability, is pleased to announce that two of its grid-scale battery storage projects have been selected in the "Capacity Market Long-Term Decarbonization Power Source Auction Results (Bidding Year: FY2025)"*1, published by the Organization for Cross-regional Coordination of Transmission Operators, JAPAN (OCCTO) on May 13, 2026.
The winning projects are the "HC25 Chugoku Dai-ichi Battery Storage System" and the "HC25 Tohoku Dai-ni Battery Storage System," with winning capacities of 46,927 kW and 43,543 kW respectively, for a total of 90,470 kW.
The Long-Term Decarbonization Power Source Auction is a system established in FY2023 as part of the capacity market, aimed at promoting investment in decarbonized power sources, including new power source investments, and securing a long-term supply capacity from decarbonized power sources. The Company has already won a total of 11 projects in the FY2023 Long-Term Decarbonization Power Source Auction, and this new win is an addition to those.
Overview of Winning Projects
No. / Project Name / Power Source Type / Winning Capacity
1 / HC25 Chugoku Dai-ichi Battery Storage System / Battery (other than lithium-ion) / 46,927 kW
2 / HC25 Tohoku Dai-ni Battery Storage System / Battery (other than lithium-ion) / 43,543 kW
Total / 90,470 kW
*1 Publication of Capacity Market Long-Term Decarbonization Power Source Auction Results (Bidding Year: FY2025) | OCCTO
Company Comment
"We are delighted that our two grid-scale battery storage projects in the Chugoku and Tohoku areas (totaling 90.47 MW) have been selected in the FY2025 Long-Term Decarbonization Power Source Auction. Grid-scale battery storage is increasingly important power infrastructure, given the growing uncertainty in the energy situation, such as rising energy costs and concerns about stable supply, alongside the expansion of renewable energy. It plays a crucial role in balancing supply and demand, alleviating grid congestion, and stabilizing power supply. Furthermore, projects selected in the auction can contribute to reducing the public burden for grid stabilization. We are steadily realizing the projects selected in the FY2023 auction, and we will leverage the development, investment, and operational expertise gained through this process to steadily advance the projects selected in this auction. While emphasizing coexistence with local communities, ensuring safety, and considering the environment, we will contribute to the realization of Japan's decarbonized society and the advancement of its energy infrastructure."
Future Outlook
With this selection, the Company will promote the commercialization of 90,470 kW of battery storage projects in the Chugoku and Tohoku areas. The Company's portfolio now amounts to a total of 13 auction-selected projects and other initiatives, reaching approximately 650 MW of transmission-end capacity and approximately 3 GWh of rated capacity. The Company will proceed with the prescribed auction procedures appropriately and will work with relevant municipalities, local communities, transmission and distribution system operators, partners, and financial institutions to steadily promote the commercialization of the selected projects.
About Hexa Energy Services LLC
A Japanese operating company of the I Squared Capital group, which develops infrastructure projects in over 70 countries worldwide. The company develops renewable energy projects and grid-scale battery storage projects that contribute to the decarbonization of energy. Committed to addressing the challenges in Japan's energy infrastructure from a global perspective, the company is already developing a total of 549 MW (as of November 2025) of grid-scale battery storage projects in Japan.
- Established: April 2023
- Representatives: Executive Officers Yuko (Watanabe) Shah, Yoichiro Mizuta
- Headquarters: 7F GranTokyo South Tower, 1-9-2 Marunouchi, Chiyoda-ku, Tokyo
- Business: General power business utilizing renewable energy, battery storage, etc.
- URL: https://www.hexa-es.com/ja
Contact for this matter:
Hexa Energy Services LLC
TEL: 03-6734-0951 (Main) Email: info@hexa-es.com
The winning projects are the "HC25 Chugoku Dai-ichi Battery Storage System" and the "HC25 Tohoku Dai-ni Battery Storage System," with winning capacities of 46,927 kW and 43,543 kW respectively, for a total of 90,470 kW.
The Long-Term Decarbonization Power Source Auction is a system established in FY2023 as part of the capacity market, aimed at promoting investment in decarbonized power sources, including new power source investments, and securing a long-term supply capacity from decarbonized power sources. The Company has already won a total of 11 projects in the FY2023 Long-Term Decarbonization Power Source Auction, and this new win is an addition to those.
Overview of Winning Projects
No. / Project Name / Power Source Type / Winning Capacity
1 / HC25 Chugoku Dai-ichi Battery Storage System / Battery (other than lithium-ion) / 46,927 kW
2 / HC25 Tohoku Dai-ni Battery Storage System / Battery (other than lithium-ion) / 43,543 kW
Total / 90,470 kW
*1 Publication of Capacity Market Long-Term Decarbonization Power Source Auction Results (Bidding Year: FY2025) | OCCTO
Company Comment
"We are delighted that our two grid-scale battery storage projects in the Chugoku and Tohoku areas (totaling 90.47 MW) have been selected in the FY2025 Long-Term Decarbonization Power Source Auction. Grid-scale battery storage is increasingly important power infrastructure, given the growing uncertainty in the energy situation, such as rising energy costs and concerns about stable supply, alongside the expansion of renewable energy. It plays a crucial role in balancing supply and demand, alleviating grid congestion, and stabilizing power supply. Furthermore, projects selected in the auction can contribute to reducing the public burden for grid stabilization. We are steadily realizing the projects selected in the FY2023 auction, and we will leverage the development, investment, and operational expertise gained through this process to steadily advance the projects selected in this auction. While emphasizing coexistence with local communities, ensuring safety, and considering the environment, we will contribute to the realization of Japan's decarbonized society and the advancement of its energy infrastructure."
Future Outlook
With this selection, the Company will promote the commercialization of 90,470 kW of battery storage projects in the Chugoku and Tohoku areas. The Company's portfolio now amounts to a total of 13 auction-selected projects and other initiatives, reaching approximately 650 MW of transmission-end capacity and approximately 3 GWh of rated capacity. The Company will proceed with the prescribed auction procedures appropriately and will work with relevant municipalities, local communities, transmission and distribution system operators, partners, and financial institutions to steadily promote the commercialization of the selected projects.
About Hexa Energy Services LLC
A Japanese operating company of the I Squared Capital group, which develops infrastructure projects in over 70 countries worldwide. The company develops renewable energy projects and grid-scale battery storage projects that contribute to the decarbonization of energy. Committed to addressing the challenges in Japan's energy infrastructure from a global perspective, the company is already developing a total of 549 MW (as of November 2025) of grid-scale battery storage projects in Japan.
- Established: April 2023
- Representatives: Executive Officers Yuko (Watanabe) Shah, Yoichiro Mizuta
- Headquarters: 7F GranTokyo South Tower, 1-9-2 Marunouchi, Chiyoda-ku, Tokyo
- Business: General power business utilizing renewable energy, battery storage, etc.
- URL: https://www.hexa-es.com/ja
Contact for this matter:
Hexa Energy Services LLC
TEL: 03-6734-0951 (Main) Email: info@hexa-es.com