Substantial energy is used to heat water for domestic, commercial, and industrial purposes, and much of that energy literally goes down the drain. After hot water enters a collection system, its heat persists, offering a renewable, carbon-free source of thermal energy that has been harnessed only rarely in North America. Looking to promote the adoption of sustainable energy sources, King County, Washington — home to the city of Seattle — is conducting a pilot program to work with property owners and developers who want to recover unused waste heat in the county’s sewer system. At press time, the county

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