Method of operating a gas turbine with staged and/or sequential combustion

The invention concerns a method of operating a gas turbine with staged and/or sequential combustion, in which the burners of a second stage or a second combustor are singularly and sequentially switched on during loading and switched off during de-loading. The total fuel mass flow and the compressor inlet guide vanes are adjusted at the same time to allow controlling gas turbine operation temperatures and engine power with respect to the required CO emission target.