NOVELTY - The process comprises generating hydrazine from a plasma, contacting a spent hydride fuel with the hydrazine, and separating a regenerated hydride fuel from the spent hydride fuel with the hydrazine. The step of generating hydrazine from the plasma: comprises generating a solution of hydrazine in liquid ammonia in a glow discharge cell; and is carried out at less than -50 degrees C. The glow discharge cell operates using: conventional glow discharge; and contact glow discharge. A voltage applied across the cell is 400-800 volts. The contacting step is carried out at 40-80 degrees C.    USE - The process is useful for regenerating spent hydride fuel, which is useful as a fuel to power a fuel cell or an internal combustion engine and is spent hydride/polymer composite fuel such as spent ammonia borane/polymer composite fuel (all claimed).    ADVANTAGE - The process is capable of easily regenerating spent hydride fuel without problems associated with the manipulation of hydrazine.    DETAILED DESCRIPTION - The process comprises generating hydrazine from a plasma, contacting a spent hydride fuel with the hydrazine, and separating a regenerated hydride fuel from the spent hydride fuel with the hydrazine. The step of generating hydrazine from the plasma: comprises generating a solution of hydrazine in liquid ammonia in a glow discharge cell; and is carried out at less than -50 degrees C. The glow discharge cell operates using: conventional glow discharge; and contact glow discharge. A voltage applied across the cell is 400-800 volts. The contacting step is carried out at 40-80 degrees C. The process is operated in either batch mode or continuous batch mode. The spent ammonia borane fuel is separated into spent ammonia borane and polymer by sublimation after contacted with the solution and separated into spent ammonia borane and polymer by dissolution of component in a solvent before contacted with the solution. The plasma is generated using microwaves, an electron beam, electron cyclotron resonance or a silent electric discharge. The process is carried out in the presence of an iron or molybdenum catalyst.