https://inhabitat.com/highdro-power-toilets-harvest-energy-from-falling-waste-water
Leicester De Montfort University industrial design graduate Tom Broadbent has created an ingenious device that can harvest energy from falling waste water found in the pipes of high-rise buildings. Broadbent’s “HighDro Power” makes this conversion possible by utilizing the same principles as a hydroelectric dam — only smaller. Fitting nicely inside any bathrooms, the HighDro Power transforms the simple act of flushing a toilet into an energy-generating action.