The Revolution Door, generating power with revolving doors

The idea for Revolution Door comes directly from New York through the study Fluxxlab. The aim is to seize the revolving doors of buildings to generate renewable energy. The truth is that hundreds of thousands of people daily to enter and leave through these doors, which seems a priori that the invention can be successful. 
The system takes the human energy and redistributes electricity to the outside, where an external mechanism is responsible for controlling it. A simple concept and brilliant at the same time, similar to that used in hydroelectric dams or wind turbines but adapted to the city. Ultimately, Revolution Door is a very ingenious alternative to assist in their means, to alleviate the energy deficit that can affect us in the near future.