NOVELTY - A power source comprises a reaction cell for the catalysis of atomic hydrogen; a reaction vessel; a vacuum pump; a source of atomic hydrogen; a source of a hydrogen catalyst comprising a bulk material; other reactant(s) to cause catalysis; and a heater for the vessel. The source of the atomic hydrogen or the source of hydrogen catalyst comprises a reaction mixture of reactant(s) comprising the element(s) that forms the atomic hydrogen or the hydrogen catalyst and other element(s). The catalysis of atomic hydrogen releases energy at greater than 300 kJ/mol hydrogen.    USE - Power source for power system (claimed).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a power system comprising a chemical fuel mixture comprising at least two components from a catalyst or a source of catalyst; atomic hydrogen or a source of atomic hydrogen; reactants to form the catalyst or the source of catalyst and the atomic hydrogen or the source of atomic hydrogen; reactant(s) to initiate the catalysis of atomic hydrogen; and a support to enable the catalysis, and thermal system(s) for reversing an exchange reaction to thermally regenerate the fuel from the reaction products comprising reaction vessels; a heat sink that accepts the heat from the power-producing reaction vessels across a thermal barrier; and a power conversion system that comprises a heat engine from Rankine or Brayton-cycle engine, turbine, steam engine, Stirling engine, or thermoelectric or thermionic converters; and    (2) a battery or fuel cell system that generates an electromotive force from the catalytic reaction of hydrogen to lower energy (hydrino) states providing direct conversion of the energy released from the hydrino reaction into electricity comprising reactants that constitute hydrino reactants during cell operation with separate electron flow and ion mass transport, a cathode compartment comprising a cathode, an anode compartment comprising an anode, and a source of hydrogen.    Regeneration reactions comprising reactions that form the initial chemical fuel mixture from the products of the reaction of the mixture are performed in reaction vessel(s) in conjunction with the other vessel(s) undergoing power reactions. The heat from a power-producing vessel flows to vessel(s) that is undergoing regeneration to provide the energy for the thermal regeneration. The vessels are embedded in a heat transfer medium to achieve the heat flow. Vessel(s) further comprises a vacuum pump, a source of hydrogen, and two chambers having a temperature difference maintained between a hotter chamber and a colder chamber such that a species preferentially accumulates in the colder chamber. A hydride reaction is performed in the colder chamber to form initial reactant(s) that is returned to the hotter chamber.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an energy reactor and power plant.    Boiler (10)    Hydrogen source (12)    Steam pipes and steam generator (13)    Turbine (14)    Water condenser (16)