State’s First Large-Scale Battery Storage Project Now Serving MGE Customers

Wisconsin’s first large-scale energy storage project—the Paris Solar-Battery Park in Kenosha County—is now serving Madison Gas and Electric (MGE) customers. 

The 110-megawatt (MW) battery portion of the Paris Solar-Battery Park came online in June 2025. The 200-MW solar portion of the project went into service in December 2024. 

The storage facility is made up of batteries capable of powering more than 130,000 homes for four hours. On sunny days, the batteries store excess power and release it at night or in the early morning when the sun is not shining. 

“Carbon is our target, and Wisconsin’s first large-scale battery storage project continues the progress we're making in working toward innovative solutions to achieve net-zero carbon electricity,” said Jeff Keebler, MGE Chairman, President and CEO. 

MGE owns 11 MW of the Paris facility’s battery storage and 20 MW of solar capacity. We Energies and Wisconsin Public Service, both subsidiaries of WEC Energy Group, own the remaining battery storage and solar capacity. 

The project was developed by U.S.-based Invenergy, a leading global developer, owner, and operator of sustainable energy solutions.