NOVELTY - Apparatus for producing hydrogen, comprises: a collector (A) of radiation to concentrate solar radiation on a converter; a separator (B) to separate the output chemical from the byproduct chemical; a reactor (C) to react the output chemical to form a storage chemical; and a processor (D) to modify at least one of the density, temperature, and pressure of the storage chemical for transportation and handling.    USE - The apparatus is useful for: producing hydrogen; generating an exothermically reactive composition; generating ammonia as a reactive hydrogen compound for subsequent exothermic reaction as a fuel; generating a chemical; and storing solar energy as chemical energy (claimed).    ADVANTAGE - The apparatus provides a highly efficient solar energy collection, storage system, water dissociation, hydrogen separation, optional hydrogen adsorption or reaction, transport and distribution.    DETAILED DESCRIPTION - Apparatus for producing hydrogen, comprises: a collector (A) of radiation to concentrate solar radiation on a converter, which has an absorptivity with respect to solar radiation to substantially convert the solar radiation to thermal energy, introduce the thermal energy to an input chemical, and drive a chemical process using the input chemical as a feedstock to produce an output chemical and a byproduct chemical; a separator (B) to separate the output chemical from the byproduct chemical; a reactor (C) to react the output chemical to form a storage chemical, reactive to produce energy but sufficiently stable for safe handling outside designation as an energetic material; and a processor (D) to modify at least one of the density, temperature, and pressure of the storage chemical for transportation and handling. INDEPENDENT CLAIMS are also included for:    (1) an apparatus for generating an exothermically reactive composition comprising hydrogen, comprising a solar (A) for collecting incident radiation in the electromagnetic spectrum to be redirected as redirected radiation, a generator comprising an energy conversion system to convert redirected radiation to thermal energy, (C) receiving the thermal energy to dissociate water at temperatures less than 1800degreesC, producing hydrogen and byproducts and a conduit conducting the output chemical from (B) to the reactor, a (B) to separate the hydrogen from the byproducts, and (D) to reformulate the hydrogen into a compound of hydrogen stable at substantially standard temperature and pressure and reactive to produce energy;    (2) an apparatus for generating ammonia as a reactive hydrogen compound for subsequent exothermic reaction as a fuel, comprising a solar (A) for collecting radiation in the electromagnetic spectrum incident from the sun, concentrating the radiation and redirecting the radiation to a converter, a generator comprising the converter to convert radiation redirected into thermal energy, (C) comprising a first catalyst, (C) receiving the thermal energy, introducing the thermal energy to water, directly dissociating the water thermally at a temperature substantially less than 1800degreesC, and producing hydrogen and byproducts, (B) to filter non-electronically the hydrogen from the byproducts, and (D) to reformulate the hydrogen into ammonia liquid to be stable proximate substantially standard temperature and pressure;    (3) an apparatus for generating a chemical having an exothermic reactivity comprising a (A) for collecting energy from a source, a generator comprising a conversion system to convert at least one first chemical species and energy into a second chemical species and first byproducts, a separation system to separate the second chemical species from the first byproducts, a first (D) to stabilize the second chemical species for use as a feedstock to produce energy and a second byproduct, and a second (D) to provide energy to the first and second byproducts and regenerate the at least one first chemical species; and    (4) an apparatus for storing solar energy as chemical energy, comprising a source of water, a (A) of solar radiation, a (A) for converting solar radiation to thermal energy and introducing that thermal energy into the water, a frame containing an array of mirrors fixed in an orientation to reflect incoming radiation to the collector, and to maintain all the mirrors in the array in substantially rigid body relation to one another and to the frame and with respect to the collector, a drive system comprising motors for orienting the frame in order to optimize the received incoming radiation from the sun, a pivot system for aiming the array and associated frame with respect to the direction of incoming solar radiation, a base for mounting the pivot with respect to the earth, (C) for providing the heated water and a catalyst in order to dissociate hydrogen and oxygen from one another, a dryer for removing water from the hydrogen, (B) for removing dissociated oxygen from the water, a drive mechanism for moving the hydrogen, and a storage system for storing the hydrogen.