THERMAL ENERGY STORAGE SYSTEM WITH INPUT LIQUID KEPT ABOVE 650°C

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A thermal energy storage system has an insulated storage container filled with a particulate earth material. A heat input conduit circuit is buried in the earth material and transfers heat from an input liquid flowing in the heat input conduit circuit to the earth material. A heat output system is operative to transfer heat from the earth material in the storage container to an external heat consumer. During operation the input liquid enters the inlet port of the heat input conduit circuit at an input operating temperature and leaves the outlet port at an output operating temperature, and the output operating temperature is above about 650°C. The input liquid remains liquid at the input and output operating temperatures under atmospheric pressure. Energy is stored at a relatively high temperature compared to the prior art, and provides increased efficiency for heat consuming processes.