The Public Service Commission of Wisconsin has approved two Alliant Energy battery energy storage projects totaling 175 megawatts (MW). The approval clears the way for construction to begin on the 100-MW Grant County Battery Project and 75-MW Wood County Battery Project. They will be located alongside the company’s Grant County and Wood County solar sites. The integration of these battery systems with Alliant Energy’s utility-scale solar sites increases customer access to safe, reliable energy even when the sun isn’t out.

"We appreciate the PSCW’s approval of these cutting-edge battery energy storage systems that will enhance grid reliability and flexibility for our customers,” according to David de Leon, President of Alliant Energy’s Wisconsin energy company. “These projects are another step toward achieving our clean energy goals while enabling a more resilient and cost-effective energy future. We are excited to break ground on these innovative battery projects and look forward to the benefits and enhanced value these systems will deliver to our customers.” 

Alliant Energy expects to begin construction on both battery projects in early 2024. The Wood County project in the town of Saratoga is expected to be operational by the end of 2024 while the Grant County project in the town of Potosi is expected to be operational by mid-2025. They will have the capacity to power over 80,000 homes for four hours and 100,000 homes for four hours, respectively. Alliant Energy selected FlexGen, a leading energy storage solution and software technology provider, to provide the energy management system and battery energy storage equipment.