The Whispering Willow Wind Farm in Franklin County, Iowa. The wind farm is capable of generating up to 200 megawatts of emissions-free wind energy for its customers — enough to power approximately 50,000 homes. The construction on the wind farm began in 2008 and completed in 2009. It consists of 121 wind turbines spread out over 144 square miles (370 km2).

The company expects that over the next 20 years, the Whispering Willow Wind Farm will offset approximately 2 million tons of carbon dioxide, 2,600 tons of nitrogen oxides, 7,000 tons of sulfur dioxides and 0.5 ton of mercury. The carbon dioxide avoided is the equivalent of taking approximately 309,000 standard-size automobiles off the road each year.