Yokohama, Japan -- JGC Holdings Corporation (Representative Director, Chairman President and Chief Execution Officer (CEO): Masayuki Sato) is pleased to announce that its domestic EPC company, JGC Corporation (Representative Director, President: Yasuharu Yamaguchi; "JGC"), has signed a Memorandum of Understanding (MOU) with Energy Dome S.p.A. (CEO: Claudio Spadacini; "Energy Dome"), an Italian company possessing CO2 Battery technology, on October 1, 2025. The purpose of this MOU is to explore potential collaboration for the introduction of CO2 Battery technology in the Japanese market.

With the rapid expansion of renewable energy generation such as solar and offshore wind power, stabilizing power supply has become a key challenge, and the development of energy storage technologies is increasingly expected to address output fluctuations. Among these technologies, Long Duration Energy Storage (LDES) has gained attention as a promising means of enhancing grid stability. In Japan, LDES has been newly designated as an eligible technology under the government's 2025 "Long-term Decarbonization Power Source Auction" program to encourage investment in decarbonized power generation, indicating expectations for further growth of this field.

Among various LDES technologies, CO2 Battery technology compresses and liquefies CO₂ using compressors and stores it in steel vessels. When power demand increases, such as during the night, the stored CO₂ is reheated and expanded to drive a turbine and generate electricity. Unlike lithium-ion batteries, CO2 Batteries do not require rare metals, and their major components can be procured from existing supply chains, while also offering no degradation over time.

JGC recognizes several competitive advantages of adopting the compared to other LDES systems, including its high charge-discharge efficiency and lower cost. In addition, as a globally recognised company, Energy Dome has already demonstrated the reliability, safety, and scalability of its CO2 Battery across multiple international markets; its technology has been selected by leading utilities and corporate buyers for delivering firm, dispatchable electricity at scale. Based on these advantages, JGC decided to enter into this MOU with Energy Dome. Under this agreement, both companies will jointly explore opportunities for introducing commercial-scale installing CO2 battery plants in Japan, combining Energy Dome's with JGC's EPC execution capabilities.

Headquartered in Milan, Italy, Energy Dome is now commercialising its mature CO2 Battery technology. The company has been operating a commercial-scale CO2 Battery plant (20 MW output, 200 MWh storage capacity), and is deploying its solution globally under a growing portfolio of commercial contracts. It is widely recognised for its robust safety profile, dependable performance, and ability to scale quickly using readily available industrial materials and supply chains.

Through this MOU, JGC will collaborate with potential project partners to study the feasibility of introducing CO2 Battery plants in Japan, leveraging Energy Dome's proven execution record. By realizing such plants, JGC aims to contribute to the realization of a decarbonized society in Japan.

【Conceptual diagram of CO2 Battery operation】

Charging phase: CO₂ is compressed and liquefied using a compressor.

Discharging phase: CO₂ is expanded and vaporized to drive a turbine and generate power.

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