Alliant Energy to Launch 99-MW Battery Energy Storage System in Wever, Iowa by January 30, 2026
Alliant Energy is set to launch a 99-megawatt Battery Energy Storage System in Wever, Iowa, by January 30, 2026, following construction that began in May 2025. This facility will store energy from an adjacent solar farm, providing power to over 100,000 homes for up to four hours, while utilizing 98% recyclable lithium iron phosphate batteries designed for a 20-year lifespan. The project aims to enhance energy reliability and affordability for customers, incorporating advanced safety measures such as remote monitoring and fire detection systems.

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.




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