Energy Vault Holdings Inc. has announced that its Calistoga Resiliency Center $(CRC)$, the world's largest clean microgrid, has received approval from the California Public Utilities Commission (CPUC) to participate in the California Independent System Operator (CAISO) energy markets. This regulatory approval allows the CRC to unlock new revenue streams by offering grid services in California's wholesale electricity market. The CRC, fully owned and operated by Energy Vault, is supported by a recent $28 million financing close, including the sale of the project's Investment Tax Credit. This development marks a significant milestone for Energy Vault, enhancing the financial value of the project and demonstrating the effectiveness of its advanced technologies, including the H-VAULT™ energy storage system and Vault-Bidder™ AI platform.