Method for loading and discharging a thermal chemical heat storage medium, wherein, during the loading of the heat storage medium, a heat flow is transmitted to the heat storage medium and at the same time a reaction medium is released from the heat storage medium, and wherein during the discharging of the heat storage medium the reaction medium released during loading is supplied to the heat storage medium and a heat flow released in this process is discharged from the heat storage medium, wherein for loading and discharging the heat storage medium is conveyed back and forth between two reservoir vessels (3, 4), characterized by the method steps of: - providing the unladen heat storage medium in a first reservoir vessel; - conveying the unladen heat storage medium along a first conveying section, in the form of a mechanical screw conveyor, from the first reservoir vessel to a second reservoir vessel, and - loading the unladen heat storage medium along the first conveying section, in the form of a mechanical screw conveyor, by supplying the heat flow by means of an electrical heating device, with simultaneous complete removal of the reaction medium from the now laden heat storage medium; - filling the second reservoir vessel with the heat storage medium laden along the first conveying section, in the form of a mechanical screw conveyor; - conveying the laden heat storage medium along a second conveying section, in the form of a mechanical screw conveyor, from the second reservoir vessel back to the first reservoir vessel, and - discharging the laden heat storage medium along the second conveying section, in the form of a mechanical screw conveyor, by supplying the reaction medium removed during loading, with simultaneous release and discharge of the heat flow by means of a heat transfer medium; - filling the first reservoir vessel with the heat storage medium unladen along the second conveying section, in the form of a mechanical screw conveyor. - providing the unladen heat storage medium in a first reservoir vessel; - conveying the unladen heat storage medium along a first conveying section, in the form of a mechanical screw conveyor, from the first reservoir vessel to a second reservoir vessel, and - loading the unladen heat storage medium along the first conveying section, in the form of a mechanical screw conveyor, by supplying the heat flow by means of an electrical heating device, with simultaneous complete removal of the reaction medium from the now laden heat storage medium; - filling the second reservoir vessel with the heat storage medium laden along the first conveying section, in the form of a mechanical screw conveyor; - conveying the laden heat storage medium along a second conveying section, in the form of a mechanical screw conveyor, from the second reservoir vessel back to the first reservoir vessel, and - discharging the laden heat storage medium along the second conveying section, in the form of a mechanical screw conveyor, by supplying the reaction medium removed during loading, with simultaneous release and discharge of the heat flow by means of a heat transfer medium; - filling the first reservoir vessel with the heat storage medium unladen along the second conveying section, in the form of a mechanical screw conveyor.