Method and System for Controlling CO2 Emissions

A system, including a turbine fluid supply system, including a fuel supply assembly (16), including a first fuel supply (70) configured to supply a first fuel to a gas turbine engine (12); and a second fuel supply (72) configured to supply a second fuel to the gas turbine engine (12), wherein the first fuel has a greater carbon content than the second fuel, and a diluent supply assembly (18) comprising at least one diluent supply (80) configured to supply at least one diluent to the gas turbine engine (12); and a controller (37) configured to control the first fuel supply (70), the second fuel supply (72), or the at least one diluent supply (80) to adjust a percentage of carbon in a combustor of the gas turbine engine (12) to maintain a ratio of carbonaceous emissions in an exhaust gas per unit of energy produced by the gas turbine engine at or below a threshold ratio.