Electric energy storage device

A method for storing electric energy, comprising the steps of:

• producing electric energy with a renewable electric energy source,
• heating a heat reaction chamber of an energy storage device comprising a first hydride material and a susceptor material with an electromagnetic field generated and transmitted by a first metal coil embedded in the heat reaction chamber with the electric energy, such that a hydrogen gas is released from the first hydride material,
• transferring the released hydrogen gas from the heat reaction chamber to an energy storage through a valve, wherein the energy storage comprises a second hydride material mixed with a susceptor material and a second metal coil,
• storing the released hydrogen gas in the energy storage for a time interval,
• releasing the stored gas from the energy storage,
• returning the released gas from the energy storage to the heat reaction chamber through a valve by controlled heating of the energy storage,
• converting the stored gas to heat in the heat reaction chamber by hydrogen gas reaction with the first hydride material,
• heating a heat exchanger with heat from the heat reaction chamber, where the heat exchanger is connected to an external system.