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Alliant Energy's new Battery Energy Storage System (BESS) in Wever, Iowa, is set to become operational on January 30, 2026. Construction began in May 2025. The 99-megawatt facility will store energy from Alliant's adjacent 150-megawatt solar farm and other sources, providing power to over 100,000 homes for up to four hours.

The site features 128 battery storage units and 34 inverters, designed and built by FlexGen, based in Durham, North Carolina. The lithium iron phosphate (LFP) batteries used are 98% recyclable and intended to have a 20-year lifespan.

Safety measures include remote monitoring and fire detection systems. The project aims to enhance energy reliability and affordability for customers.