An electricity supply apparatus includes a control device configured to calculate an amplitude of a control signal and to generate the control signal; an energy station configured to draw a current from a mains, to provide part of the drawn current to the load, to receive the control signal from the control device, and to vary the drawn current according to the amplitude; and a battery configured to recharge by drawing part of the drawn current and to discharge by supplying the load. The apparatus is characterized in that the control device is further configured to calculate the amplitude of the control signal also according to battery information relating to a recharge and/or a discharge condition of the battery.