The flywheel has a diameter of one meter and weighs three tons, and can be placed in the garden of a private house. The proposed solution consists of a hollow, solid cylinder that is rotated around an axis and connected to an electric motor and generator. “When you have the energy to store, the engine drives the flywheel, which accelerates,” said the company's co-founder and general director, André Gennesseaux. “In the other direction, the motor can act as a brake to discharge the electricity.” Currently, Energiestro offers a standard storage solution with a nominal power of around 10 kW, which...