NOVELTY - A system comprises: a pumpable hydrogen storage slurry, where the pumpable hydrogen storage slurry comprises an inert liquid (105) and reversible hydride formers (107); at least one charging device (30) adapted to put non-hydrided reversible hydride formers of the pumpable hydrogen storage slurry in a hydrided state; and at least one discharge device (70) adapted to heating the pumpable hydrogen storage slurry under anhydrous conditions to release hydrogen from the hydrided reversible hydride formers and form non-hydrided reversible hydride formers.    USE - As a system (claimed) in which energy is stored or transported in the form of hydrogen.    ADVANTAGE - The slurry used in the system can be safely stored and transported, and the hydrogen may be easily extracted for use as a fuel. The slurry is generally not highly flammable or combustible and may be safely handled, stored, and transported. The slurry is stable at normal environmental temperatures and pressures, for example, such that hydrogen does not dissociate from the hydride and evolve. Because it is a liquid, the slurry can easily be pumped through conduits and into storage tanks, transportation devices, and/or charging and discharging devices. In the system energy can be stored in the hydrogen at a place where the energy is readily available, for example, from wind and/or the sun, but the demand for energy is relatively low, and transported to a place where energy demand is high.    DETAILED DESCRIPTION - A system comprises: a pumpable hydrogen storage slurry, where the pumpable hydrogen storage slurry comprises an inert liquid (105) and reversible hydride formers (107); at least one charging device (30) adapted to put non-hydrided reversible hydride formers of the pumpable hydrogen storage slurry in a hydrided state; and at least one discharge device (70) adapted to heating the pumpable hydrogen storage slurry under anhydrous conditions to release hydrogen from the hydrided reversible hydride formers and form non-hydrided reversible hydride formers. The reversible hydride formers have a hydrided state and a non-hydrided state. The pumpable hydrogen storage slurry is not subjected to significant hydrogen evolution at room temperature and pressure when the reversible hydride formers are in a hydrided state.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of storing and transporting energy.    Charging device (30)    Metal hydride slurry (38)    Discharge device (70)    Inert liquid (105)    Reversible hydride former (107)