 In late 2007, Alliant Energy received final approval to sell their utility services in Illinois to Jo-Carroll Energy.In 2000, the utility purchased the naming rights to the campus of the Dane County Expo Center just southwest of downtown Madison, including the county-owned arena, which were all renamed the Alliant Energy Center.In the 1970s IES constructed the Duane Arnold Energy Center, a 615 MW nuclear plant in Palo, Iowa.