The two wind farms are the 170MW Beaver Creek and 168MW Prairie wind farms, which are currently in operation, said the utility.
While the Beaver Creek wind farm is spread across the Boone and Greene counties, the Prairie wind farm has been built in Mahaska County.
Construction of the two wind farms began in the spring of 2017 after the approval by the Iowa Utilities Board in 2016.
Put together, the Beaver Creek and Prairie wind projects generate enough power to meet the electricity requirements of more than 140,000 households in Iowa.
The two wind farms are part of MidAmerican Energy’s $3.6bn Wind XI project and add a combined 169 wind turbines to the 2,000 plus that are currently owned and operated by the electric utility.
While the Beaver Creek wind farm is made up of 85 turbines, the Prairie wind farm features 84 turbines.
The Wind XI project, which is expected to be fully completed in late 2019, will have a total power generation capacity of 2,000MW.
MidAmerican Energy expects its renewable generation to make up more than 90% of the annual retail power consumption of its customers by 2020.
MidAmerican Energy resource development vice president Mike Fehr said: “We’re committed to providing reliable service and outstanding value to our customers, and wind energy accomplishes both.
“Wind energy is good for our customers, and it’s an abundant, renewable resource that also energizes the economy.”
According to MidAmerican Energy, the Beaver Creek and Prairie wind projects are estimated to deliver property tax revenue worth $62.4m over the next 20 years.
