Every year, America misses out on 1.2 million megawatt-hours of electricity, enough to power a small city. Where's it all going? Literally, it's being flushed down the drain.
With the right kind of technology, we could harvest the energy of water running downhill through America's infrastructure, including canals, tunnels, pipelines, and existing dams, reports Susan Kraemer at Earth Techling.
The key is "micro-hydropower" devices, which can harvest small amounts of water power. For human-made waterways, there's Hydrovolts "Big Canal Turbine."