A battery energy storage unit at Alliant Energy’s microgrid system in Boaz, WI.

Edgewater battery energy storage system

The Edgewater battery energy storage system (BESS) is on land adjacent to our Edgewater Generating Station. This standalone system will draw power from the grid during periods of low demand and release it when demand is high. When finished, the 99-megawatt (MW) Edgewater BESS will be able to power up to 100,000 homes for up to four hours.

What is a BESS?

A BESS is a large collection of batteries connected directly to the power grid. These facilities charge the batteries at night when demand is typically low and release energy during the day when demand is high. This helps us meet customer needs, reduces the need for traditional grid upgrades and strengthens reliability during outages and severe weather.

Energy storage FAQ

Project timeline

Spring 2026

Site preparation
Foundation and concrete work

Summer 2026

Battery installation

Fall 2026

Electrical completion
BESS operations

Learn more about energy storage
employee standing near energy storage equipment

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