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Transfer station is based on the idea of reusing sewage. Taking the fact into consideration that starting from the 10th floor, 30 litres of water poured down from 9 metres high can be transformed into 200KW/T of potential energy. So, if you take a building that is ten floors high as your calculation model, with four families of four members each, the electricity that can be generated every day by these sixteen people is over 200KW (subtracting the energy due to friction). Transfer station could generate the whole building's need of electricity from one whole day! In large, a city can generate far more electricity than one huge power supply station.
Rouzhen Li, Kongping Lin, Gui yuanlong, Yang chun
Guangzhou City, Guangdong, China