“We appreciate the PSC’s approval of this innovative solution as we continue to build a strong and resilient energy future,” said Raja Sundararajan, executive vice president of Strategy and Customer Solutions at Alliant Energy. “The Columbia Energy Storage Project positions us to meet the growing energy needs of our customers and the communities we serve. It’s also a key part of our balanced energy mix, our roadmap for delivering the reliable, cost-effective energy customers count on.”
Development of the Columbia Energy Storage Project is led by Alliant Energy in partnership with Wisconsin Public Service Corporation, a subsidiary of WEC Energy Group, and Madison Gas and Electric.
Utilizing cutting-edge technology designed by Energy Dome, the Columbia Energy Storage Project will boost grid stability, improve resilience and deliver enough electricity to power approximately 18,000 Wisconsin homes for 10 hours on a single charge. The closed-loop system will take energy from the grid and convert CO2 gas into a compressed liquid form for long-term storage. Then, when the stored energy is needed, the system converts the liquid CO2 back to a gas, which powers a turbine to create electricity.
The energy storage system will be built south of Portage, Wisconsin in the town of Pacific and near Alliant Energy’s existing Columbia Energy Center. Construction is expected to begin in 2026 and be completed by the end of 2027.
The addition of energy storage capacity is part of Alliant Energy’s Energy Blueprint, the company’s long-term plan to expand generation capacity with a balanced mix of energy resources. For more information on the company’s battery energy storage projects, visit alliantenergy.com/battery.
Media Contact: Cindy Tomlinson, (608) 458-4040, [email protected]
About Alliant Energy
Alliant Energy Corporation (NASDAQ: LNT) provides regulated energy service to approximately 1 million electric and 430,000 natural gas customers across Iowa and Wisconsin. Alliant Energy's mission is to deliver energy solutions and exceptional service to customers and communities count on – safely, efficiently and responsibly. Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL) are Alliant Energy's two public energy companies. For more information, visit alliantenergy.com and follow Alliant Energy on LinkedIn, Facebook, Instagram and X.
About Energy Dome
Energy Dome is at the forefront of redefining long-duration energy storage with its CO2 Battery. The properties of carbon dioxide allow the system to store energy efficiently and cost-effectively through a patented thermodynamic process, hence representing the most valid alternative to lithium-ion batteries or pumped-hydro solutions. The CO2 Battery is already a fully validated and cost-effective system that uses no lithium or rare-earth elements to store electricity, boasting superior round-trip efficiency. With a modular approach and site-independent footprint, CO2 batteries use readily available, off-the-shelf components from reliable, existing supply chains, providing a scalable pathway to store massive amounts of intermittent renewable energy and accelerate the energy transition; it’s the only technology available today offering the right combination of efficiency, cost, scalability and that’s viable globally. For more information, visit energydome.com.
Forward-looking statement
This document includes forward-looking statements. These statements can be identified because they include words such as “plans,” “will,” “approximately,” “expected,” “plan,” or other words or expressions of similar import. Similarly, statements that describe the Columbia Energy Storage Project and our Energy Blueprint are forward-looking statements. These forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed in, or implied by, the statements. Actual results could be materially affected by the following factors, among others: unanticipated construction issues, delays or expenditures; the inability to obtain necessary equipment and labor in a timely manner; the inability to complete construction of the storage project by planned in-service dates and within the cost targets; unforeseen engineering or technology issues; failure of equipment and technology to perform as expected; the ability to successfully resolve warranty issues or contract disputes; federal governmental actions that delay or change the terms or amount of the grant funding for the energy storage project or include terms that make the grant uneconomical; political conditions in Alliant Energy’s and WPL’s service territories; current or future litigation, regulatory investigations, proceedings or inquiries; and economic conditions in Alliant Energy’s service territory. These factors should be considered when evaluating the forward-looking statements and undue reliance should not be placed on such statements. The forward-looking statements included herein are made as of the date hereof and Alliant Energy and WPL undertake no obligation to update publicly such statements to reflect subsequent events or circumstances.
Alliant Energy Corporation (NASDAQ: LNT) provides regulated energy service to approximately 1 million electric and 430,000 natural gas customers across Iowa and Wisconsin. Alliant Energy's mission is to deliver energy solutions and exceptional service customers and communities count on – safely, efficiently and responsibly. Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL) are Alliant Energy's two public energy companies. For more information, visit alliantenergy.com and follow Alliant Energy on LinkedIn, Facebook, Instagram and X.