Energy Diversity

Desired Trend


Current Trend

Baseline (2010): 3.2%
Current (2019): 11.3%

Theme Efficient


Percent of electricity supplied by renewable sources

Why is it Important?

Renewable energy is a sustainable solution for society’s energy needs. Renewable energy increases energy security, improves air quality by reducing pollution, and reduces greenhouse gas emissions. Renewable energy also promotes growth in the local economy, because renewable energy production requires jobs that can’t be outsourced. Sources of renewable energy include hydropower, wind, landfill gas, and solar. Solar energy includes solar purchased by utility companies from customers as well as solar energy credits purchased from third party brokers.

The states of Missouri and Illinois have renewable energy standards for investor owned utilities. In Illinois, legislation enacted in 2007 requires 25 percent of electricity to be generated from renewable sources by 2026, with 75 percent of that amount from wind and six percent from solar. Missouri’s Prop C, passed by voters in 2008, requires utility companies to generate 15 percent of electricity from renewable sources by 2021, with two percent of that amount from solar. As of 2018, the Missouri Renewable Energy Standard requires that 10 percent of energy sales come from renewable sources. This requirement will increase again in 2021 to 15%. . In Illinois, the 2018 renewable energy standard required that 14.5 percent of energy sales come from renewable sources and will increase to 16 percent for 2019.

How are we Doing?

In the St. Louis region approximately 11.3 percent of electricity was generated from renewable sources in 2019, an increase over the baseline year (2010) percentage of 3.3 percent.The increase in renewable energy sourcing corresponds to the increasing renewable energy standards set by the states of Missouri and Illinois.

To meet its renewable energy requirements in Illinois, Ameren Illinois sourced 11 percent of its total electricity from wind power in 2019, with another 2 percent from hydropower. In Missouri, Ameren uses renewable energy credits generated from a variety of sources to meet the states renewable energy requirements. In 2019, around 5 percent of Ameren Missouri’s renewable energy came from credits generated by a hydroelectric plant in Keokuk, Iowa, and 7 percent comes from credits generated by a wind farm in Mitchell County, Iowa. Around 2 percent of its renewable energy credits comes from landfill gas captured in Maryland Heights, and another 2 percent comes from various sources of solar power, including the solar facility in O’Fallon. In 2019, for the first time, third-party brokers supplied the largest share of renewable energy credits used. Non-solar third-party credits accounted for 81 percent of the renewable energy credits used by Ameren, while third-party solar accounted for another 1 percent.  

To meet energy demands, Ameren uses energy procured from outside sources, and it uses energy generated through facilities that Ameren operates itself. Ameren operates 22 unique energy centers throughout Illinois, Iowa, and Missouri. Around 50 percent of the energy capacity generated from these centers comes from coal, with another 30 percent coming from oil and natural gas. In 2098, around 3.9 percent of Ameren Missouri’s energy production capacity came from renewable sources, which equates to around 392 megawatts of energy. In September of 2017, Ameren announced plans to add 700 megawatts of wind energy to its operations by 2020 and 100 megawatts of solar energy by 2027. Ameren’s announcement also included plans to retire several coal facilities, including the Meramec facility in south St. Louis County.2

Geographic Level

St. Louis eight-county bi-state region, including Franklin, Jefferson, St. Charles, and St. Louis counties and the city of St. Louis in Missouri and Madison, Monroe, and St. Clair counties in Illinois. View map.


1The percent of electricity supplied by renewable sources is calculated using an average of the Missouri and Illinois renewable energy requirements weighted by population. 

2Ameren. Press Release: Ameren Plans Major Expansion of Wind, Solar Generation to Serve Customers. 25 September 2017; Accessed on February 5, 2018 at


Data Sources

Ameren Corporation