Over the past 20 years, MidAmerican Energy customers have embraced our efforts to build renewable energy and have experienced tangible benefits. From the first wind farm built in Buena Vista and Sac counties in 2004 to today’s fleet of more than 3,400 wind turbines across the state, MidAmerican has positioned Iowa as a renewable energy powerhouse. These investments have delivered cleaner energy, helped keep electricity costs low for all customers, strengthened environmental sustainability and supported local communities through economic growth.

 

In 2016, MidAmerican set an ambitious goal – to generate renewable energy equal to 100% of our Iowa retail customers’ annual usage.

 

To track progress toward that goal, MidAmerican worked with customers, regulators and environmental stakeholders in 2017 to launch the GreenAdvantage program. The program provides a transparent, verifiable way to track renewable energy generated on behalf of customers. Rather than selling renewable energy certificates (RECs) on the market, MidAmerican retires them. This allows Iowa businesses, industrial facilities and residents to claim the renewable energy associated with their electricity use and advance their own sustainability goals.

 

On behalf of its customers, MidAmerican continued to invest in wind and solar energy, striving to reach its 100% renewable goal. Thanks in part to a robust wind resource, in 2022, MidAmerican achieved its goal and verified through the GreenAdvantage program that we generated the equivalent of 100% of our Iowa retail customers’ annual energy needs using renewable energy sources.

 

Today, customers have shifted to evaluating energy generation on a carbon-free basis – including sources like nuclear in addition to renewable energy like wind and solar. To support changing customer preferences and priorities, MidAmerican redefined the GreenAdvantage program in 2024 to track carbon-free energy, as well as energy generated from renewable sources. The adjustment includes retiring emission-free energy certificates (EFECs) in addition to RECs originally included in the program.

 

In 2025, MidAmerican delivered the equivalent of 95.9% carbon-free energy to serve Iowa customers’ electricity usage over the course of the year.

 

Each year, by April 1, MidAmerican files its Iowa Fuel Report with the Iowa Utilities Commission, detailing the percentage mix of fuel and energy inputs used to produce electricity, including the percentages of electricity produced by coal, nuclear energy, natural gas, oil and resources purchased from other companies. The 2025 Iowa Fuel Report is the basis for the GreenAdvantage calculation.

 

2025 documentation verifying the retirement of RECs and EFECs

Prior Year Reports: