The Wood County battery energy storage system (BESS), in the town of Saratoga in central Wisconsin, sits adjacent to our existing 150-megawatt (MW) solar field. The Wood County BESS went online in late 2025 and can store 75 MW of electricity drawn from the nearby solar field or other sources. When fully charged, the batteries at this site can power the equivalent of 80,000 homes for four hours.
The Wood County BESS facility has an estimated 20-year lifespan. Operators monitor the site 24 hours a day, seven days a week, which allows them to respond immediately to any changes in performance.
This BESS facility brings our planned and operational energy storage in Wisconsin to 275 MW.
How does battery storage work?
Battery storage systems charge from the grid when energy demand is low or directly from wind or solar projects when excess renewable energy is abundant. They discharge energy when demand increases, such as on hot summer or cold winter days. The ability to capture and store energy to use when needed improves the overall benefit of renewable resources.
