Energy Vault Begins Construction of the Largest Green Hydrogen Long Duration Energy Storage System in the U.S.

Energy Vault | 22 February 2024

Hybrid Green Hydrogen plus Battery energy storage system will be capable of powering approximately 2,000 electric customers within PG&E’s Calistoga microgrid for up to 48 hours (293 MWh of carbon-free energy)


Project supported by a 10.5-year tolling agreement; Commercial operation expected by the end of Q2 2024, solidifying Energy Vault’s global leadership role in green hydrogen and gravity-based technologies for long duration energy storage

Enabling a sustainable world with renewable energy.

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