Alliant Energy is seeking approval from the Iowa Utilities Board to add up to 500 megawatts (MW) of wind energy in the state. A decision is expected in early 2018.

The company received approval in 2016 for a similar expansion. The combined projects would represent a $1.8 billion investment and add up to 1,000 MW of new wind generation in Iowa. Wind is expected to be more than one-third of the company's Iowa energy mix in 2020.

Alliant Energy's Iowa energy company, Interstate Power and Light, filed an application that includes:

  • A cost cap of $1,780/kilowatt, including allowance for funds used during construction (AFUDC) and transmission costs
  • 11 percent return on common equity (ROE)
  • 40-year depreciable life
  • In service by end of 2020