Now for the idea. Take the power generators used at dams and place them in the sewer. That way, the tons and tons of gallons of water going down the drain can potentially help power the city's electric needs. Of course strategic placement would be necessary, but I figure that even if it can't power all of the homes, it might be able to power all public needs such as street lamps and traffic lights.
The background for my idea of sewer generated power was a result of considering the necessity of dams. A lot of power is generated by dams, but they ruin ecosystems and sometimes cause home-displacement. However, if every city with a sewer system could use all the water that goes through it, would that be more than enough "clean energy"?
N. D. Moharo