NOVELTY - The installation (1) has a hydrogen generation unit (12) that generates hydrogen. A hydrogen storage device (17) stores hydrogen comprising a loading unit (16) for loading a carrier medium with the hydrogen and an unloading unit (22) for discharging the hydrogen of the carrier medium. A heat device (4) generates and stores the heat. The heat device connected with the unloading unit provides the heat. The heat device has a metal oxide compound which contains vanadium, chromium, manganese, iron, cobalt, copper, nickel, zinc, cerium, zirconium, molybdenum and/or tungsten.    USE - Installation for use as photovoltaic plants, wind power plants and/or hydroelectric power plants for storing energy for use in generation of electric current.    ADVANTAGE - The availability of the electric current, which is generated from the regenerative forms of energy is enhanced. The decomposition of water into hydrogen and oxygen is enabled by the electrolyzer. The heat required for the unloading of hydrogen is easily provided and the loss is reduced. The release of the hydrogen from the hydrogen storage device is enabled. The stream inflow efficiency of the plant is enhanced. The energy is more available at comparatively low cost. The current-to-current efficiency of conditioning is improved. The generation and the storage of the required heat are allowed. The partial reduction of the metal compound or the metal oxide mixture is possible. The metal oxide compound and the metal oxide mixture are available at low cost. Therefore, an improvement in the current-to-current efficiency is achieved. The heating of the heat transfer medium is improved. The discharge is carried out in a simple manner. The effort and the supply of the hydrogen into the hydrogen oxidation unit are simplified. The storing effect of the hydrogen storage device is enhanced.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for storing energy.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the installation for storing energy.    Installation for storing energy (1)    Heat device (4)    Hydrogen generation unit (12)    Loading unit (16)    Hydrogen storage device (17)    Unloading unit (22)