Italian long-duration energy storage company Energy Dome has signed a supply agreement for the Columbia Energy Storage Project with Alliant Energy.
Based in Columbia County, Wisconsin, the project would feature Energy Dome’s 20MW/200MWh CO2 battery.
This announcement of a signed supply agreement comes after the companies received a $30 million competitive Cooperative Agreement award from the U.S. Department of Energy’s Office of Clean Energy Demonstrations.
Alliant Energy also recently submitted project plans to the Wisconsin Public Service Commission. Construction on the project is expected to begin in 2025 and finish in 2026, according to the Energy Dome website.
“We see this as the first of many CO2 Batteries to be built in partnership between Energy Dome and Alliant to continue delivering reliable and affordable energy in the communities we serve,” said Raja Sundararajan, Alliant Energy Executive Vice President.
Energy Dome’s technology uses a thermodynamic cycle, charging by drawing CO2 from a ‘Dome’ gasholder, storing it under pressure, and then dispatching it by evaporating and expanding the gas through a turbine back into the gasholder. The company said its battery can power 18,000 homes in Wisconsin for 10 hours on a single charge.
Energy Dome is currently building an identical CO2 Battery plant in Sardinia, Italy. The Sardinia plant’s completion is expected by the second quarter of 2025. Energy Dome said the Sardinia project would provide the “ideal testbed from both a construction and operational perspective.”
