Energy Diversity

Desired Trend


Current Trend

Baseline (2010): 3.2%
Current (2012): 4.2%

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.

How are we Doing?

In the St. Louis region approximately 4.2 percent of electricity was generated from renewable sources in 2012, an increase over the baseline year (2010) percentage of 3.2 percent.1 The increase in renewable energy sourcing corresponds to the increasing renewable energy standards set by the states of Missouri and Illinois. In 2012, the majority of renewable energy for Ameren Illinois was sourced from wind power (seven percent of total electricity), with another one percent from hydro power. Ameren Missouri obtained around three percent of its electricity from renewables, with the majority of that percentage from hydropower in 2012, followed by wind and solar.

As of 2012, the majority of electricity for the St. Louis region is generated from coal, which provides 73 percent of electricity for Ameren Missouri and 68 percent of electricity for Ameren Illinois. Nuclear power is the next largest source, providing 24 percent of electricity for Ameren Missouri and 13 percent of electricity for Ameren Illinois.

Geographic Level

St. Louis eight county bi-state region, including Franklin, Jefferson, St. Charles and St. Louis counties and 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 by adjusting the percent of electricity from renewable sources for Ameren Missouri and Ameren Illinois to account for the electricity usage of St. Louis area Ameren customers from each state.

Data Sources

Ameren Corporation