A power plant includes a first gas turbine engine, a second gas turbine engine, a flue gas duct, a CO2 capture system for treating flue gases from the second gas turbine engine and an exhaust system. It additionally includes at least one among a direct connection between the first gas turbine engine and the exhaust system, and a damper for on-line regulating the flue gases flow through it, a direct connection between the first gas turbine engine and the CO2 capture system, and a damper for regulating the flue gases flow through it, a supply of fresh oxygen containing fluid for the second gas turbine engine.