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Hydroelectricity — using the flow of water to generate power — has long been a small but key source of renewable energy. How can cities around the country better harness that potential? A startup in Portland, Oregon, has developed a system that gets energy from gravity-fed drinking water pipes to produce electricity without any environmental impact. Hari Sreenivasan reports.
Read the full transcript: https://www.pbs.org/newshour/bb/drinking-water-pipes-can-also-deliver-electric-power/