Three utilities have received approval from Wisconsin utility regulators to buy the state’s largest renewable energy plant.

On Thursday, the Public Service Commission approved the $649 million purchase of the Koshkonong Solar Energy Center by We Energies, Wisconsin Public Service and Madison Gas and Electric.

The utilities are buying the solar plant from Chicago-based developer Invenergy. The commission approved its construction last year in the towns of Christiana and Deerfield in Dane County, the solar panels covering roughly half of the 4,600 acre site.

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