Energy Vault Holdings Inc. has begun construction on the 150 MW SOSA Energy Center in Madison County, Texas, marking a major milestone in the company’s growing “Own & Operate” Asset Vault strategy and expanding its total portfolio under operation and construction to more than 340 MW.
The battery energy storage system, located in Texas’ ERCOT North market, is expected to reach commercial operation by the second quarter of 2027. Originally developed by Savion, a subsidiary of Shell plc, the project was formally acquired by Energy Vault in the fourth quarter of 2025 and represents the first Asset Vault project to move into full construction.
The 150 MW/300 MWh facility will deploy Energy Vault’s third-generation B-VAULT™ DC battery technology, designed to support rapid deployment, competitive construction costs and improved system availability. Once operational, the project is expected to provide critical grid-balancing services while supporting renewable energy integration across one of the nation’s most active power markets.
“Breaking ground on the SOSA Energy Center so quickly after acquisition demonstrates the velocity with which we are executing and growing Energy Vault's Asset Vault platform and underscores our strategic commitment to the Texas ERCOT market, one of the most dynamic energy markets in the United States,” said Robert Piconi, Chairman and Chief Executive Officer of Energy Vault. “Texas continues to lead the nation in renewable energy adoption and grid modernization, making it a cornerstone market for our growth strategy. This project not only demonstrates our ability to rapidly execute on high-quality acquisitions and move swiftly from acquisition to construction, but also advances Energy Vault’s position as a key energy infrastructure partner in supporting Texas's energy transition.”
Energy Vault expects the SOSA Energy Center to operate under a 6- to 8-year offtake agreement, which is currently in advanced negotiations with an investment-grade counterparty. Over the technical life of the project, total revenue is projected to exceed $350 million, translating to approximately $17 million to $20 million in recurring, high-margin annual revenue.
The company will self-perform engineering, procurement, construction and long-term service operations for the facility, allowing it to capture value across the full lifecycle of the asset. Energy Vault said the project benefits from fully secured site control, a clean title and completed environmental and interconnection milestones, positioning it for a streamlined construction timeline.
The SOSA Energy Center also reflects Energy Vault’s broader investment momentum in late 2025. During the fourth quarter, the company increased cash and liquidity by roughly 65% to more than $100 million, exceeding the high end of its guidance range. In parallel, Asset Vault commenced off-site construction on three additional energy storage projects in its near-term pipeline, with expected commercial operations between late 2027 and late 2028.
Company executives said the growing balance sheet strength positions Energy Vault to continue scaling its owned asset base while executing its long-term energy asset management strategy in competitive power markets.
Originally reported by Business Wire.
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