The CO2 is condensed at 60 bar in unit 11, liquid CO2 is pumped to l00 bar and returmed to recuperator 3, Water from combustion may be heated in unit 9 if process steam is needed. Liquid CO2 from combustion is injected into the well 16. The N2 compressor 6 is attached to the shaft by a switch. When the separated N2 is com and injected, the net power output pressed