It makes sense after you see it. Where there are people, there is water. Where there is water flowing in pipes, there is energy. Dams don’t produce electricity by holding back the water. Dams produce electricity by channeling the water through pipes that have turbines in them. The same idea can be used in municipal water supplies. Deliver water and energy at the same time.
“Portland Adds Hydroelectric Water Pipes” – Slash Gear
Pretending Not To Panic 