NOVELTY - The control unit (1) for controlling hydrogen electrolysis, hydrogen storage (4) and electricity generation from hydrogen reservoirs at power grid, is claimed, where the power grid is monitored for voltage and frequency and is determined from these monitored information, where the power grid is extracted by electrolysis current or is supplied by operation of an electricity generator. The power grid is manually monitored by a control program or by remote control. The control program is carried out using external parameters such as weather data, time, day or current rate information.    USE - The control unit is useful for controlling hydrogen electrolysis, hydrogen storage and electricity generation from hydrogen reservoirs at power grid, where the stored hydrogen is used for refueling vehicles or the operation of fuel cells in households or other facilities.    ADVANTAGE - The control unit ensures efficient, rapid and precise control of hydrogen electrolysis, hydrogen storage and electricity generation from hydrogen reservoirs.    DETAILED DESCRIPTION - The control unit (1) for controlling hydrogen electrolysis, hydrogen storage (4) and electricity generation from hydrogen reservoirs at power grid, is claimed, where the power grid is monitored for voltage and frequency and is determined from these monitored information, where the power grid is extracted by electrolysis current or is supplied by operation of an electricity generator. The power grid is manually monitored by a control program or by remote control. The control program is carried out using external parameters such as weather data, time, day or current rate information. The remote control is done through the internet or mobile. The unit parameters are detected, stored and reported in addition at a headquarters, where the system parameters influence the function of the unit, for example no more further electrolysis is operated in full hydrogen tank. The control unit parameters are partially or completely changed or set via a control panel. The control unit controls electrolysis or electricity generation in the plant in a network-independent island power supply system on external request.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a control unit.    Control unit (1)    Electrolysis unit (2)    Hydrogen storage (4)    Water supply (6)    Operator console. (9)