aerial photo of an electric battery storage system

Energy storage

Advancing our renewable energy future


As the electric grid continues evolving, we are leading the way with innovative solutions that integrate emerging technologies and optimize energy resources such as wind, solar, hydro and traditional generation systems. These efforts improve reliability and efficiency.

Energy storage infrastructure is a newer part of our strategy and a key to accelerating our transition to renewable energy. With major transformations underway, battery storage helps us meet demand, reduces the need for traditional power grid updates and ensures we are prepared in the event of outages and severe weather.

We currently have several battery storage pilot units in operation. We are also evaluating potential new development opportunities to harness more locally generated power and accelerate our transition to renewable energy. Find more information about our plans in our Energy Blueprint.

See all our upcoming generation projects

Battery storage systems

Battery storage units make the most of our renewable energy assets and increase efficiency and reliability. When demand is low, we store excess electricity that’s generated and then release it to the grid when needed.

Energy storage helps us better meet customer needs and helps us avoid costly infrastructure upgrades.

Portage battery facility structures
woman and man talking in front of a large battery storage system

Video: Battery storage explained

video thumbnail of an aerial shot of a battery storage system

Video: Grant County, Wis. battery storage system

Featured project: Columbia Energy Storage Project

We’re teaming up with Wisconsin Public Service Corporation, a subsidiary of WEC Energy Group, Madison Gas and Electric, and the Electric Power Research Institute – to build one of the most responsible, advanced energy storage systems in the country.

The 200-megawatt-hour project will be the first of its kind in the United States and represents a significant advancement toward a more reliable, resilient and cost-effective energy future.

We’ll build the facility on the site of the current Columbia Energy Center. Construction is expected to begin in 2026 and be finished by the end of 2027.
Learn more about the project
Long Duration Energy Storage rendering (Columbia County Wis.)

Alliant Energy energy storage facilities


Click on the map below to learn more about each of our current and planned energy storage facilities.

Potosi Fire Dept logo

"Potosi Fire and EMS teamed up with several groups, including Alliant Energy, for a great training opportunity on battery energy storage systems. Forty volunteer members from fire and EMS attended the training, which was informative, helpful and very useful. It was excellent paced and a good use of time, with good content. The trainers were professional and well knowledgeable on the topics."

Ryne Emler, Fire Chief - Potosi Wis. Volunteer Fire Department

Mayuri Farlinger, Alliant Energy
"Battery technology has advanced by leaps and bounds, enabling new projects to deliver greater efficiency, performance and affordability. We see enormous potential for energy storage systems as we continue our transition to safe, reliable and cost-effective renewable energy for our customers.”

Mayuri Farlinger, President – Alliant Energy's Iowa energy company and Vice President – Energy Delivery

More energy storage topics

Energy storage FAQ
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Your questions, answered
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