A method for starting and operating a non-methane hydrocarbon ("NMHC") fueled gas turbine combined cycle power plant, the method comprising: injecting gaseous NMHC fuel into a gaseous NMHC fuel treatment system; injecting at least one of auxiliary steam, heat recovery steam generator ("HRSG") steam, or HRSG water into the gaseous NMHC fuel treatment system; mixing the at least one of auxiliary steam, HRSG steam, or HRSG water with the gaseous NMHC fuel in the NMHC fuel treatment system to form a gaseous NMHC fuel mixture; injecting the gaseous NMHC fuel mixture into a gaseous NMHC fuel distribution system; and providing the gaseous NMHC fuel mixture through the gaseous NMHC fuel distribution system to a combustor of the NMHC fueled gas turbine; the method further comprising supplying liquid NMHC fuel to a liquid NMHC fuel treatment system, or supplying liquid non-NMHC fuel to a liquid non-NMHC fuel treatment system; wherein supplying liquid NMHC fuel to a liquid NMHC fuel treatment system comprises: injecting the liquid NMHC fuel from the liquid NMHC fuel treatment system into a liquid NMHC fuel distribution system; and providing the liquid NMHC fuel through the liquid NMHC fuel distribution system to the combustor; and wherein supplying liquid non-NMHC fuel to a liquid non-NMHC fuel treatment system comprises: injecting the liquid non-NMHC fuel from the liquid non-NMHC fuel treatment system into a liquid non-NMHC fuel distribution system; and providing the liquid non-NMHC fuel through the liquid non-NMHC fuel distribution system to the combustor. injecting gaseous NMHC fuel into a gaseous NMHC fuel treatment system; injecting at least one of auxiliary steam, heat recovery steam generator ("HRSG") steam, or HRSG water into the gaseous NMHC fuel treatment system; mixing the at least one of auxiliary steam, HRSG steam, or HRSG water with the gaseous NMHC fuel in the NMHC fuel treatment system to form a gaseous NMHC fuel mixture; injecting the gaseous NMHC fuel mixture into a gaseous NMHC fuel distribution system; and providing the gaseous NMHC fuel mixture through the gaseous NMHC fuel distribution system to a combustor of the NMHC fueled gas turbine; the method further comprising supplying liquid NMHC fuel to a liquid NMHC fuel treatment system, or supplying liquid non-NMHC fuel to a liquid non-NMHC fuel treatment system; wherein supplying liquid NMHC fuel to a liquid NMHC fuel treatment system comprises: injecting the liquid NMHC fuel from the liquid NMHC fuel treatment system into a liquid NMHC fuel distribution system; and providing the liquid NMHC fuel through the liquid NMHC fuel distribution system to the combustor; and wherein supplying liquid non-NMHC fuel to a liquid non-NMHC fuel treatment system comprises: injecting the liquid non-NMHC fuel from the liquid non-NMHC fuel treatment system into a liquid non-NMHC fuel distribution system; and providing the liquid non-NMHC fuel through the liquid non-NMHC fuel distribution system to the combustor. injecting the liquid NMHC fuel from the liquid NMHC fuel treatment system into a liquid NMHC fuel distribution system; and providing the liquid NMHC fuel through the liquid NMHC fuel distribution system to the combustor; and wherein supplying liquid non-NMHC fuel to a liquid non-NMHC fuel treatment system comprises: injecting the liquid non-NMHC fuel from the liquid non-NMHC fuel treatment system into a liquid non-NMHC fuel distribution system; and providing the liquid non-NMHC fuel through the liquid non-NMHC fuel distribution system to the combustor. injecting the liquid non-NMHC fuel from the liquid non-NMHC fuel treatment system into a liquid non-NMHC fuel distribution system; and providing the liquid non-NMHC fuel through the liquid non-NMHC fuel distribution system to the combustor.