A heat store (1) for storing heat energy, consisting of a solid material with a high heat storage capacity, e.g. a concrete block (3). Heat energy is conveyed by a heat transfer fluid flowing through a circuit (6) that partially consists of a duct (2) embedded in the solid material block (3), said circuit (6) also being used to deliver the stored energy to a heat consumer. The heat transfer fluid may also remove stored heat from the solid block when it is buried in the ground.
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