A power plant with at least one steam cycle and with at least one high temperature thermal energy (heat) exchange system is provided. The high temperature thermal energy exchange system includes at least one heat exchange chamber with chamber boundaries which surround at least one heat exchange chamber interior of the heat exchange chamber. The chamber boundaries include at least one inlet opening for guiding in an inflow of at least one heat transfer fluid into the heat exchange chamber interior and at least one outlet opening for guiding out an outflow of the heat transfer fluid out of the heat exchange chamber interior; at least one heat storage material is arranged in the heat exchange chamber interior such that a heat exchange flow of the heat transfer fluid through the heat exchange chamber interior causes a heat exchange between the heat storage material and the heat transfer fluid.