The Darien Solar PV Park – Battery Energy Storage System is a 75,000kW energy storage project located in Darien, Wisconsin, US.

The project was announced in 2021 and will be commissioned in 2023.


The Darien Solar PV Park – Battery Energy Storage System is being developed by Invenergy. The project is owned by Madison Gas and Electric (50%), a subsidiary of MGE Energy and WEC Energy Group (50%).

Contractors involved

Madison Gas and Electric and WEC Energy Group are the owners. Invenergy is the developer.

Additional information

Madison Gas and Electric (MGE), in partnership with We Energies and Wisconsin Public Service (WPS), subsidiaries of WEC Energy Group, is seeking approval from the Public Service Commission of Wisconsin (PSCW) to purchase solar energy and battery storage from the Darien Solar Energy Center. If approved, MGE will own 25 MW of solar energy and 7.5 MW of battery storage from the 250 MW solar park to be built in the Town of Bradford in Rock County and the Town of Darien in Walworth County.

About Invenergy

Invenergy LLC (Invenergy) is a full-service energy solutions provider. The company invests, develops, constructs, owns, and operates renewable and other clean energy generation and storage facilities. The company captures, generates, and stores power from wind, solar, natural gas. Invenergy provides a range of technology and end-to-end energy solutions to corporations, utilities and other energy asset owners. Its services include asset management, energy management, and engineering and analysis, among others. It also offers on-site and performance inspections and maintenance services. The company operates through regional development offices in the US, Canada, Colombia, Mexico, Japan, Poland and Scotland. Invenergy is headquartered in Chicago, Illinois, the US.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.