Storage system for renewable energies

The system (1) has an electricity generation unit (2) e.g. wind wheel or solar module, and a power supply (4) feeding electrical energy to a charging module (5) i.e. charging cabinet, which is coupled with the power supply. The power supply is connected to the electricity generation unit over a switch (9). The charging module is formed as a mobile on the power supply and an uncoupled charging module. The charging module comprises a set of connecting places (6) for charging a set of mobile energy store units (7) e.g. rechargeable battery modules or fuel cells. An independent claim is also included for a method for storing electrical energy produced in an electricity generation unit.