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In early September lawmakers in St. Louis, Missouri passed a resolution committing to 100% renewable energy by 2035. According to the resolution, wind and solar would be the primary means for power generation. The city joins the growing list of other US cities committed to 100% renewable power.
Personally, it’s a little surprising to see St. Louis on the list of 100% renewable cities. Most larger metropolitan areas committed to full renewable sources are on the West Coast (San Jose, San Francisco, San Diego), although Atlanta, Madison, WI and Greensburg, KS have also committed. As of 2012, St. Louis’s energy mix is dominated by coal and nuclear—only 4.2% comes from renewable sources. The city clearly has a long way to go in a short time to meet the goal.
But upon closer inspection the potential for renewable power in St. Louis looks healthy. A 2004 NREL solar radiation map shows that Missouri has the potential for decent solar development—not as much as the Southwest or West Texas, but much more promising than the Northeast US. Wind power potential tells a similar story, as shown below: wind speeds at 80 meters average around 6 m/s in eastern Missouri, slightly better than the national average but not quite as windy as the Great Plains to the west.

Another potential renewables resource curiously absent from the city’s plan is hydropower development on the Mississippi River. A 2012 report by the US Department of Energy found that the Melvin Price Locks and Dam—located on the Mississippi only 17 miles from St. Louis—is #5 on the list of US non-powered dams in terms of untapped hydropower potential. The DoE estimates that the Melvin Price Dam could generate 1.4 million MWh per year and has an estimated potential capacity of nearly 300 MW.
Aside from renewable resources, St. Louis has the additional advantage of having a small city proper and large metro area. The independent city of St. Louis had an estimated population of only 311,000 in 2016; for comparison, Greater St. Louis—which consists of 11 Missouri and Illinois counties—has a population of nearly 3 million. Supplying power to a compact, manageable city (which has unfortunately been shrinking since the 1950s) is theoretically easier than with a large, sprawling metro area.
The resolution passed in September doesn’t legally hold the city to meeting their goal, but it does lay plans for future legislation and development for a city looking to at least diversify away from coal.
Image credit: NREL
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