Power generator using gray water

The Sidwell Friends School InvenTeam invented the Gray Water Electricity Generator (GWEG) to capture energy from the downward flow of gray water and rainwater in apartment buildings. A turbine is installed at the bottom of gray water pipes to harness the potential energy of the downward flowing water and create a pressure head that turns a generator. GWEG, demonstrated in a three-story prototype, is the model for future implementations in apartment buildings with 15 stories or more. GWEG has an estimated continuous output of 200 W.