NOVELTY - The electric-power generator (101) has hydrogen desorber, hydrogen generator, electromotive units (I,II), and controller. The hydrogen desorber has hydrogen generation container (1) installed with functional substance (2) or battery element comprising cathode (3), anode (6) and electrolyte (21). The battery element generates electric power in unit (I), and hydrogen acceptor (30) generates electric power in unit (II) by hydrogen gas. The controller controls the amount of hydrogen gas generated by hydrogen generator according to load current amount.    USE - Electric-power generator is used as power supply device for mobile telephones and motor vehicles.    ADVANTAGE - The electric-power generator is highly functional, lightweight, and economical. The electric-power generator enables storage and transport of safe natural power sources with an inexhaustible supply material harmless to the human body. A perfect zero-emission cycle and global-warming prevention become possible.    DETAILED DESCRIPTION - The electric-power generator (101) has a hydrogen desorber, a hydrogen generator, electromotive units (I,II), and a controller. The hydrogen desorber has a hydrogen generation container (1) installed with a functional substance (2), or a battery element consisting of a cathode (3), an anode (6), and an electrolyte (21). The hydrogen generator has a liquid container (20) which generates hydrogen gas both by bonding of hydrogen atoms fixed between crystals due to quality-change of functional substance by hydrolysis, and by hydrolysis in which the functional substance is reacted with water or aqueous solution (electrolyte). The battery element in the hydrogen generation container generates electric power in electromotive unit (I), and a hydrogen acceptor (30) generates electric power in electromotive unit (II) by hydrogen gas produced in the hydrogen generation container. The controller controls the amount of hydrogen gas generated by the hydrogen generator according to the load current amount by applying electric power generated by unit (I) to a load apparatus (10). The functional substance contains lumps, fragments, or fine particles of compound containing carbon family elements, such as silicon or their alloys or hydrides, compound containing alkali metals, such as lithium or their alloys or hydrides, compound containing alkali-earth elements, such as magnesium and calcium, or their alloys or hydrides, or compound containing boron group elements, such as aluminum and boron, or their alloys or hydrides. The anode uses thionyl chloride, nickel hydroxide, metal oxide, and/or transition-metal oxide. The electrolyte solution contains water, organic solvent, brine (magnesium chloride), chloride, and/or aqueous solution or organic solution of acid or alkali. INDEPENDENT CLAIMS are included for the following:    (1) functional substance;    (2) hydrogenation of functional substance; and    (3) reduction of functional substance.    DESCRIPTION OF DRAWING(S) - The drawing shows the general view of the electric-power generator.    Hydrogen generation container (1)    Functional substance (2)    Cathode (3)    Anode (6)    Load apparatus (10)    Liquid container (20)    Electrolyte (21)    Hydrogen acceptor (30)    Electric-power generator (101)