Tellus Materials Energy Technology Perspective
Commercial Breakthrough in Large-Scale Electrolysis and Salt Cavern Storage
ACES Delta's 40 fully operational 5.5MW electrolyzers, combined with 300GWh of salt cavern storage, demonstrate unprecedented possibilities for green hydrogen deployment at both temporal and geographic scales. This integrated system validates the feasibility of large-scale, long-duration storage leveraging renewable energy surpluses, directly reducing the total cost of ownership for both hydrogen generation and energy storage solutions.
The seamless integration of electrolyzer technology with geological storage is fundamentally reshaping energy storage economics.
Project Scale and Operational Status
The ACES Delta green hydrogen project in Utah is now entering its final commissioning phase following a major operational milestone. This 220-megawatt facility, developed through a joint venture between Chevron and Mitsubishi Power, has successfully completed the installation of all 40 electrolyzer units, with each system now operating at maximum capacity. According to Norwegian electrolyzer manufacturer HydrogenPro, these state-of-the-art 5.5-megawatt units are performing at 100% load capacity across all installations, while compression systems have initiated the transfer of hydrogen gas into subsurface salt cavern storage facilities.
This large-scale hydrogen production and storage complex began its commissioning process last December and has now progressed to its final testing and validation stages. Located north of Delta, Utah, the facility represents a significant advancement in America's trajectory toward large-scale green hydrogen production and deployment.
Strategic Energy Hub Design and Vision
The ACES Delta initiative is spearheaded by a consortium of Chevron and Mitsubishi Power, with the primary objective of supplying stable, reliable green hydrogen to the Los Angeles Department of Water and Power's 840-megawatt Intermountain Power Station. This facility will blend green hydrogen with conventional natural gas in a 30% hydrogen and 70% gas mixture for combustion, generating dispatchable electricity that ultimately serves the Los Angeles metropolitan area.
The project's innovative approach leverages the renewable energy surplus available through the Western Interconnection grid, a transmission system spanning across the western United States and western Canada. By activating electrolyzer units during periods of peak renewable energy generation, the facility can produce up to 100 tonnes of green hydrogen daily. This hydrogen is then pressurized and stored within two subterranean salt caverns offering a combined storage capacity of 300 gigawatt-hours, sufficient to accommodate approximately 9,000 tonnes of hydrogen. According to Chevron's specifications, this storage capacity exceeds the combined capacity of all grid-connected battery storage systems in the United States by a factor of two to three times.
Technological Breakthroughs and Scale Leadership
All 40 electrolyzer units at ACES Delta are supplied by HydrogenPro, which manufactures high-pressure alkaline electrolyzers primarily at its facility in Tianjin, China, where the company has established substantial technical expertise in green hydrogen production. The scale of ACES Delta substantially exceeds competing projects currently under development. The second-largest green hydrogen initiative in the United States is Infinium's 100-megawatt e-fuels project in Texas, representing only half the capacity of ACES Delta. In comparison, America's largest completed and operational renewable hydrogen facility is Linde's 35-megawatt plant at Niagara Falls, which is considerably smaller in scale.
HydrogenPro Chief Executive Officer Jarle Dragvik commented on the achievement: "I am proud of HydrogenPro's engagement in one of the largest hydrogen projects in the world, contributing to California's clean energy supply and advancing global decarbonization efforts."
Policy Environment and Development Challenges Ahead
The project was originally slated for commercial operation in 2025 but has experienced delays that extended its timeline. Chevron, holding approximately 78% ownership of the project, has maintained confidentiality regarding the specific factors contributing to this postponement.
The American green hydrogen sector faces emerging policy headwinds. Following the new administration's assumption of office, federal green hydrogen production incentives under the 45V tax credit program were rapidly discontinued, creating significant challenges for numerous projects currently under development or in planning stages. Against this backdrop, ACES Delta's successful progression and near-completion status establishes a pivotal benchmark for large-scale commercial deployment within the American green hydrogen industry. Should the facility achieve successful commercial operation, it will provide critical validation of green hydrogen's viability and economic competitiveness as a long-duration, dispatchable renewable energy storage solution, with profound implications for the global hydrogen sector's future trajectory.
