Iowa Code Title XI. Natural Resources [Chs. 455-485] § 476.21. Discrimination prohibited

A corporation or cooperative association providing electrical or gas service shall not consider the use of renewable energy sources by a customer as a basis for establishing discriminatory rates or charges for any service or commodity sold to the customer or discontinue services or subject the customer to any other prejudice or disadvantage based on the customer's use or intended use of renewable energy sources. As used in this section, “renewable energy sources” includes but is not limited to solar heating, wind power and the conversion of urban and agricultural organic wastes into methane gas and liquid fuels.