Increasing urbanization leads to a rise in energy demand, which in turn leads to an increase in power plant load, fuel consumption, and emissions rate. The principle of conventional gas turbine power cycle is based on Brayton cycle. The high temperature exhaust is considered as waste, if not utilized. Therefore, a heat exchanger is added to utilize this waste heat called recuperator to preheat the compressed air. Conventional fuels contain hydrocarbons, which release lots of CO and NOx emissions, whereas fuels without carbon have fewer emissions. This paper presents the gas turbine performance comparison between hydrocarbon (CH4) and non-hydrocarbon fuel (NH3, H2). During this, the mass flow rate of air is kept constant throughout the cycle. The estimation of the energetic-exergetic performance of gas turbines has been accomplished by the use of thermodynamic modeling. Steady flow energy equation is used to estimate the quantitative parameters of gas turbines. Energy analysis compares the result quantitatively whereas exergy analysis compares qualitatively. Hydrogen and ammonia are able to produce the same power with zero carbon emissions. Among all the proposed fuels, the energy and exergy efficiency of H2 is 41.1 and 40.6% which is better than CH4 and NH3.