The Benkatine Turbine is a neat little gizmo that generates power from any pipe which feeds water. Think of it as a micro-hydroelectric power plant and you’re somewhere close, except you’re using small flows of water to create power rather than a mega-massive dam holding back billions of gallons of water. I suspect that this will be more useful for placement in things like rain water run-offs than in toilet pipework, but then again…? More here.
HydroElectric – in-pipe turbine known as the Benkatina Turbine. The Benkatina was designed to generate electricity under conditions that were previously uneconomic, and to be integrated into any existing or planned downhill flow system including fresh water, waste water, industrial output, gutters, etc. The Benkatina comes in different sizes, providing different power output of various ranges.