A system, comprising: a turbine combustor; a turbine driven by combustion products from the turbine combustor; an exhaust gas compressor, wherein the exhaust gas compressor is configured to compress and route a combustion exhaust gas from the turbine to the turbine combustor; an exhaust gas recirculation path extending through the exhaust gas compressor, the turbine combustor, and the turbine; a recirculation conduit configured to direct an outflow of the combustion exhaust gas from the turbine as an inflow of the combustion exhaust gas to the exhaust gas compressor; a first exhaust gas extraction port disposed along the EGR path at the exhaust gas compressor, the turbine, the turbine combustor, or the recirculation conduit; a second EG extraction port disposed along the EGR path at the exhaust gas compressor, the turbine, the turbine combustor, or the recirculation conduit, wherein at least one of the first or second EG extraction ports is disposed at the turbine combustor; and a control system configured to: control the power plant such that the turbine combustor operates, in periods, at a preferred equivalence ratio between 0.95 and 1.05; receive sensor feedback indicative of a property of the combustion exhaust gas flowing through the first EG extraction port and the second EG extraction port; control extraction of the combustion exhaust gas through the first EG extraction port and the second EG extraction port during the periods when the combustor operates at the preferred equivalence ratio, based at least in part on the sensor feedback indicative of the property of the combustion exhaust gas; and controllably mixing the combustion exhaust gas extracted from the first EG extraction port and from the second EG extraction port to generate a combined combustion exhaust gas having a preferred value for the property of the combined combustion exhaust gas based on an intended downstream process. a turbine combustor; a turbine driven by combustion products from the turbine combustor; an exhaust gas compressor, wherein the exhaust gas compressor is configured to compress and route a combustion exhaust gas from the turbine to the turbine combustor; an exhaust gas recirculation path extending through the exhaust gas compressor, the turbine combustor, and the turbine; a recirculation conduit configured to direct an outflow of the combustion exhaust gas from the turbine as an inflow of the combustion exhaust gas to the exhaust gas compressor; a first exhaust gas extraction port disposed along the EGR path at the exhaust gas compressor, the turbine, the turbine combustor, or the recirculation conduit; a second EG extraction port disposed along the EGR path at the exhaust gas compressor, the turbine, the turbine combustor, or the recirculation conduit, wherein at least one of the first or second EG extraction ports is disposed at the turbine combustor; and a control system configured to: control the power plant such that the turbine combustor operates, in periods, at a preferred equivalence ratio between 0.95 and 1.05; receive sensor feedback indicative of a property of the combustion exhaust gas flowing through the first EG extraction port and the second EG extraction port; control extraction of the combustion exhaust gas through the first EG extraction port and the second EG extraction port during the periods when the combustor operates at the preferred equivalence ratio, based at least in part on the sensor feedback indicative of the property of the combustion exhaust gas; and controllably mixing the combustion exhaust gas extracted from the first EG extraction port and from the second EG extraction port to generate a combined combustion exhaust gas having a preferred value for the property of the combined combustion exhaust gas based on an intended downstream process. control the power plant such that the turbine combustor operates, in periods, at a preferred equivalence ratio between 0.95 and 1.05; receive sensor feedback indicative of a property of the combustion exhaust gas flowing through the first EG extraction port and the second EG extraction port; control extraction of the combustion exhaust gas through the first EG extraction port and the second EG extraction port during the periods when the combustor operates at the preferred equivalence ratio, based at least in part on the sensor feedback indicative of the property of the combustion exhaust gas; and controllably mixing the combustion exhaust gas extracted from the first EG extraction port and from the second EG extraction port to generate a combined combustion exhaust gas having a preferred value for the property of the combined combustion exhaust gas based on an intended downstream process.