Using Isentropic Ltd's innovative combined heat pump/heat engine, electricity is used to create a large temperature difference (+500 C hot and -160 C cold), which can then be stored in two low-cost insulated tanks filled with crushed rock. Recombining the hot and cold regenerates the electricity with an overall round-trip efficiency of 75%. Isentropic® PHES system is normally located within a steel-framed building. The storage material (crushed rock) is ideally sourced from a local quarry or mine. Assuming suitable rock is available, the only operations required are to crush the rock, grade it, wash it and dry it. The stores are designed so that they can be easily transported in smaller sections and then assembled on site.

The facility is capable of 1,900kW charging (input) power.

Heat Thermal Storage