Kind of off-topic from the subject of renewables but on-topic for the subject of what to do with waste heat from power generation: a city near me has a power pl

Kind of off-topic from the subject of renewables but on-topic for the subject of what to do with waste heat from power generation: a city near me has a power plant on the shore of Lake Michigan. They draw in water from the lake for steam generation and then have to dispose of the hot water somehow. Instead of dumping it straight back into the lake and disrupting the ecosystem with extra hot water, they run it under the sidewalks in the city. 762 gallons of really hot water runs under the sidewalks of the city every minute, keeping the northern-latitude tourist town ice-free, salt-free, snowplow-free no matter how cold it gets. There are really interesting ways to deal with all kinds of byproduct from industry that are non-obvious. Like heating a hospital with waste heat from a power plant.