NOVELTY - The oxygen and hydrogen generation system (10) has a photoelectrolysis system (12) with a solar collector (22) to collect and concentrate solar radiation to heat water and generate electricity. An electrolysis unit (26) electrolyzes the heated water via generated electricity to produce two gas mixtures comprising oxygen and steam and hydrogen and steam. A primary device receives and uses the first gas mixture. A hydrogen membrane (36) receives and separates the hydrogen and steam mixture into a hydrogen component and a steam component.    USE - Oxygen and hydrogen generation system for e.g. IGCC plant, chemical manufacturing plant, or petroleum refinery.    ADVANTAGE - Provides a photoelectrolysis system with an on-demand source of oxygen gas diluted with water vapor which offers regulation compliance and logistical rewards over other oxygen-producing systems, where the oxygen may be produced or isolated and stored in liquid form on-site until use. Moreover, the oxygen mixture may provide improved temperature control or reactant mixing. Provide oxy-combustion reaction chambers that include separate inlets for independently providing both oxygen and steam to an oxy-combustion reaction, in which steam may provide a sink for excess thermal energy such that the temperature profile of the reactor becomes uniform. Provides a steam that generally makes the performance of the reactor more uniform in terms of energy and product output. Provides improved reactant mixing since the oxygen and the water are premixed before encountering the fuel by delivering an oxygen mixture to an oxy-combustion reactor.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic of a photoelectrolysis system providing an oxygen flow and a hydrogen flow directed into portions of an IGCC plant, a chemical manufacturing plant, or petroleum refinery.    Oxygen and hydrogen generation system (10)    Photoelectrolysis system (12)    Solar collector (22)    Electrolysis unit (26)    Hydrogen membrane (36)