Device (1) for storing electric energy, comprising a heat reaction chamber (3) comprising a metal carbonate or a metal hydride material, a gas storage (4) and an electric heater (5) adapted to heat the reaction chamber (3), a Stirling engine (7) comprising a heater head (8) and adapted to be powered by the heat reaction chamber (3), a generator (9) connected to and adapted to be driven by the Stirling engine (7), where the device is provided with a compressor (11) arranged downstream of the reaction chamber (3) and upstream of the gas storage (4) adapted to increase the pressure of the gas flowing into the gas storage (4) from the reaction chamber (3), and a pressure relief valve (10) arranged downstream of the gas storage (4) and upstream of the heat reaction chamber (3) adapted to control the pressure of the gas flowing into the reaction chamber (3) from the gas storage (4). The advantage of the invention is that a reliable and cost-effective storage device for renewable electric energy is provided.
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