A power plant arrangement, comprising: at least one main air compressor for compressing ambient air into a compressed ambient gas flow; a gas turbine assembly; an oxidizer unit for receiving at least a first portion of the compressed ambient gas flow from the at least one main air compressor and configured to deliver a compressed oxygen-rich gas flow to the at least one gas turbine assembly; and the at least one gas turbine assembly, comprising: a turbine combustor, fluidly connected to the oxidizer unit, for mixing the compressed oxygen-rich gas flow witch at least a first portion of a recirculated gas flow and a fuel stream to form a combustible mixture and for burning the combustible mixture and forming the recirculated gas flow; a turbine connected to the turbine combustor, and being arranged to be driven by the recirculated gas flow from the turbine combustor; a turbine compressor, fluidly connected to the turbine combustor, and connected to a turbine shaft and being arranged to be driven thereby; a recirculation loop for recirculating the recirculated gas flow from the turbine to the turbine compressor; a recirculated gas flow extraction path for extracting a second portion of the recirculated gas flow from the at least one gas turbine assembly; a gas separation system for receiving the second portion of the recirculated gas flow from the recirculated gas flow extraction path and separating the second portion of the recirculated gas flow into a nitrogen portion and a carbon dioxide portion; an air separation unit configured to separate oxygen and nitrogen from ambient air, wherein the at least a first portion of the compressed ambient gas flow is passed through the air separation unit and an oxygen flow is derived therefrom and is delivered to the oxidizer unit, wherein at least a second portion of the compressed ambient gas flow is delivered to the oxidizer unit and mixed with the oxygen flow from the air separation unit. at least one main air compressor for compressing ambient air into a compressed ambient gas flow; a gas turbine assembly; an oxidizer unit for receiving at least a first portion of the compressed ambient gas flow from the at least one main air compressor and configured to deliver a compressed oxygen-rich gas flow to the at least one gas turbine assembly; and the at least one gas turbine assembly, comprising: a turbine combustor, fluidly connected to the oxidizer unit, for mixing the compressed oxygen-rich gas flow witch at least a first portion of a recirculated gas flow and a fuel stream to form a combustible mixture and for burning the combustible mixture and forming the recirculated gas flow; a turbine connected to the turbine combustor, and being arranged to be driven by the recirculated gas flow from the turbine combustor; a turbine compressor, fluidly connected to the turbine combustor, and connected to a turbine shaft and being arranged to be driven thereby; a recirculation loop for recirculating the recirculated gas flow from the turbine to the turbine compressor; a recirculated gas flow extraction path for extracting a second portion of the recirculated gas flow from the at least one gas turbine assembly; a gas separation system for receiving the second portion of the recirculated gas flow from the recirculated gas flow extraction path and separating the second portion of the recirculated gas flow into a nitrogen portion and a carbon dioxide portion; an air separation unit configured to separate oxygen and nitrogen from ambient air, wherein the at least a first portion of the compressed ambient gas flow is passed through the air separation unit and an oxygen flow is derived therefrom and is delivered to the oxidizer unit, wherein at least a second portion of the compressed ambient gas flow is delivered to the oxidizer unit and mixed with the oxygen flow from the air separation unit. a turbine combustor, fluidly connected to the oxidizer unit, for mixing the compressed oxygen-rich gas flow witch at least a first portion of a recirculated gas flow and a fuel stream to form a combustible mixture and for burning the combustible mixture and forming the recirculated gas flow; a turbine connected to the turbine combustor, and being arranged to be driven by the recirculated gas flow from the turbine combustor; a turbine compressor, fluidly connected to the turbine combustor, and connected to a turbine shaft and being arranged to be driven thereby; a recirculation loop for recirculating the recirculated gas flow from the turbine to the turbine compressor; a recirculated gas flow extraction path for extracting a second portion of the recirculated gas flow from the at least one gas turbine assembly; a gas separation system for receiving the second portion of the recirculated gas flow from the recirculated gas flow extraction path and separating the second portion of the recirculated gas flow into a nitrogen portion and a carbon dioxide portion; an air separation unit configured to separate oxygen and nitrogen from ambient air, wherein the at least a first portion of the compressed ambient gas flow is passed through the air separation unit and an oxygen flow is derived therefrom and is delivered to the oxidizer unit, wherein at least a second portion of the compressed ambient gas flow is delivered to the oxidizer unit and mixed with the oxygen flow from the air separation unit.