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Treated Denver wastewater flows into the South Platte River in April. In what may be the largest U.S. project of its kind, Denver will use excess energy from sewage wastewater to heat and cool a new agriculture, arts and education center. Hart Van Denburg/CPR News hide caption toggle caption Hart Van Denburg/CPR News Treated Denver wastewater flows into the South Platte River in April. In what may be the largest U.S. project of its kind, Denver will use excess energy from sewage wastewater to heat and cool a new agriculture, arts and education cente...

Hart Van Denburg/CPR News The National Western Center plans to use excess energy from Denver's existing wastewater system to heat and cool buildings, now under construction at the 250-acre site, including Colorado State University's new "Spur" campus. A secret cache of renewable energy is lurking in the sewers. The key question is how to coax it to the surface and put it to work in the battle against climate change. There’s no mystery over how excess energy ends up below cities. Showers, hot waters and sinks all add hot water to sewers. In fact, the U.S. Department of Energy estimates Ameri...