NOVELTY - Electrical current generating system comprises: (1) a fuel cell operating at 250degreesC; (2) a gas system which is a hydrogen gas separation system (1) or oxygen gas delivery system (2), coupled to the fuel cell, the gas system comprises: (i) a compressor; or (ii) a pump; and (iii) a drive system for the compressor or pump comprises a mechanism for removing energy from the gas systems, or heat of the fuel cell.    USE - As an electrical current generating system for fuel cells, e.g. molten carbonate and solid oxide fuel cells (all claimed).    ADVANTAGE - The system enhances energy efficiency of fuel cells, while enhancing electrical power output. The concentrated carbon dioxide is delivered for disposal or sequestration. The system and the processes completely eliminates NOx emissions by complete elimination of combustion in the presence of nitrogen. The system and processes also provides a high overall efficiency to achieve the most sustainable use of energy resources.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (a) process for providing a feed stream to a fuel cell operating at 250degreesC, comprises:    (i) providing (1) or (2) coupled to the fuel cell, the gas systems comprises a device selected from a compressor or vacuum pump;    (ii) recovering energy from the gas systems, or heat of the fuel cells; and    (iii) operating the compressor or vacuum pump with the recovered energy to provide the feed stream to the cell; and    (b) process for providing an oxygen-containing gas stream and a carbon dioxide-containing gas stream to a cathode of a molten carbonate fuel, and a hydrogen-containing gas stream to a anode of the fuel cell, comprises:    (i) separating a hydrogen-containing gas stream into a hydrogen-enriched gas stream and a carbon dioxide-enriched gas stream;    (ii) combusting a mixture of the carbon dioxide-enriched gas stream and an oxygen-containing gas stream to provide a combustion product gas stream;    (iii) introducing the hydrogen-enriched gas stream into the fuel cell anode; and    (iv) introducing the combustion product gas stream into the fuel cell cathode.    DESCRIPTION OF DRAWING(S) - The figure shows an axial section of the rotary PSA module.