Alliant Energy’s first 100-megawatt battery energy storage system (BESS) is now operational in southwest Wisconsin. The battery captures and stores excess energy generated by solar and other resources, releasing the energy to the grid when needed. It sits next to Alliant’s 200-MW solar project in Grant County. 

“Energy storage systems, like this one, complement our existing generation resources and serve as an incredibly important step toward creating a more intelligent and resilient grid,” David de Leon, president of Alliant Energy’s Wisconsin energy company, said in a statement. “The combination of BESS and solar is a critical part of our balanced energy portfolio. Collectively, they offer enormous potential, adding value and flexibility, while ensuring the availability of reliable and cost-effective energy for our customers.”

The battery system can power over 100,000 homes for up to four hours on a single charge. Expanding into battery storage is part of Alliant Energy’s Energy Blueprint, a roadmap for advancing and balancing energy options