Interstate Power and Light Company (IPL), a subsidiary of Alliant Energy Corporation, said that it has initiated commercial operation of its first owned-and-operated wind farm in Iowa. The Whispering Willow Wind Farm-East in Franklin County, Iowa has a capacity of 200 megawatts (MW).

The IUB's approval included a return on equity of 11.7 percent and a 25 year depreciation life the IPL wind development.