NOVELTY - Purified hydrogen gas and fuel is produced by passing tail gas from plasma process into pressure swing adsorption (PSA) system (13) to generate purified hydrogen product (16) and PSA tail gas, separating and compressing purified hydrogen product, and separating and compressing PSA tail gas for use as fuel (17) or reuse back into plasma process.    USE - Production of purified hydrogen gas and fuel for combined cycle power plant, simple cycle power plant, and steam power plant (all claimed).    ADVANTAGE - Generation and recapture of electricity reduces combined cycle power plant net air emission, simple cycle power plant net air emission, steam power plant net air emission, steam power plant fossil fuel consumption, and coal consumption and increases simple cycle steam power plant overall efficiency.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) generating and recapturing of electricity from combined cycle power plant which involves flowing natural gas into plasma process and hydrogen generating plant, flowing hydrogen produced into combined cycle power plant, flowing natural gas into combined cycle power plant to produce electricity, partially flowing into power grid, and partially flowed back into plasma process plant;    (2) recapturing electricity generated from simple cycle power plant which involves flowing natural gas into plasma process and hydrogen generating plant, flowing hydrogen produced into simple cycle power plant, flowing natural gas and nitrogen dilution gas into single cycle power plant to produce electricity, and flowing electricity back into plasma process plant; and    (3) generating and recapturing of electricity from steam power plant which involves inputting electricity and natural gas into plasma process carbon black, air and hydrogen generating plant, flowing air and hydrogen produced into steam generating boiler, flowing steam generated into steam power plant to produce electricity, and flowing electricity back into plasma process plant or to electricity grid.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of tail gas integration system.    PSA system (13)    Hydrogen product compressor (14)    PSA tail gas compressor (15)    Hydrogen product (16)    Fuel (17)