Power plant and method for retrofit

The power plant (1) comprises a first gas turbine engine (2), a second gas turbine engine (2), a flue gas duct (4), a CO 2 capture system (5) for treating flue gases from the second gas turbine engine (3) and an exhaust system (6). It additionally comprises at least one among a direct connection (9) between the first gas turbine engine (2) and the exhaust system (6), and a damper (10) for on-line regulating the flue gases flow through it, a direct connection (13) between the first gas turbine engine (2) and the CO 2 capture system (5), and a damper (14) for regulating the flue gases flow through it, a supply (17) of fresh oxygen containing fluid for the second gas turbine engine (3).