How drinking water pipes can also deliver electric power

Aired: 4/14/2015 | 0:06:49 | Clip
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.