In two moves aimed at bettering the environment, the Dane County Board on Thursday approved the purchase of 295 acres to expand Indian Lake County Park and a major solar farm that would allow the county to move to all-renewable energy.

County Board members unanimously authorized an agreement for Alliant Energy to build a 16.5-megawatt solar farm on county-owned property in the town of Cottage Grove. The project still needs approval from state regulators.