MADISON, Wisconsin (January 13, 2026) – Two important Battery Energy Storage Systems (BESS) are now fully operational. According to Alliant Energy, its Wood County facility in Saratoga, Wisconsin, and its Wever facility in Lee County, Iowa are now each storing electricity generated by adjacent solar fields. Both projects are critical components of the company’s Energy Blueprint, which is the company’s roadmap for building a strong energy future to meet the growing energy needs in Iowa and Wisconsin.
“We are proud to serve every customer with genuine care and to help build communities that shine with strength, connection and possibility,” said Dave Herkert, AVP of Strategic Projects at Alliant Energy. “As we bring new projects like these online, we’re expanding our capacity to deliver reliable energy when our communities need it most.”
Wood County BESS
Located in the town of Saratoga, the Wood County BESS is on land adjacent to the Alliant Energy’s 150 megawatt (MW) solar field. The BESS portion of the site stores 75 MW of electricity and can power the equivalent of 80,000 homes for up to four hours. The new Wood County BESS facility brings Alliant Energy’s planned and operational energy storage in Wisconsin to 275 MW.
Wever BESS
Located in Southeast Iowa, the 100-MW Wever BESS is on land adjacent to the 150-MW solar farm. The storage system will be able to power the equivalent of 100,000 homes for up to four hours. The Wever BESS, combined with three other planned projects, will bring planned battery storage capacity in Iowa to approximately 400 MW.
Storage and Safety
BESS charge from nearby wind or solar generation when renewable energy is abundant, or from other available resources. The batteries can then add energy to the grid when demand increases, typically on hot summer days and cold winter nights. Alliant Energy contracted with battery energy solutions and software provider FlexGen to design battery components and a portion of the systems at both the Wood County and Wever battery sites.
“Our mission is to equip utilities and the communities they serve with energy solutions to harness, store and distribute the energy that is vital to the core of our daily lives and economies,” said Jason Rislov, Senior Vice President of Operations at FlexGen. “As grid conditions grow more dynamic, battery storage gives companies like Alliant Energy the confidence to deliver energy as promised while integrating renewable generation, strengthening grid resiliency and meeting long-term load growth.”
Both battery systems are monitored 24 hours a day, seven days a week, allowing operators to act immediately to any changes in performance. Alliant Energy also worked with local fire departments to ensure readiness should an incident occur on either site. By storing and releasing solar‑generated energy, these BESS facilities give Alliant Energy greater flexibility and help avoid customer costs that would otherwise come from replacing equipment or building additional lines and poles to meet growing energy needs.
For more information, visit alliantenergy.com/newbess
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 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.