The world energy demand increases year by year together with the greenhouse gases emissions. The state regulations are becoming stricter and stricter requiring pollutants reduction. In this context, hydrogen represents an effective alternative to traditional fuels such as natural gas. Its high reactivity extends the flammability limits and the flame speed and one of the main advantages is the lower emissions. Despite the advantageous properties, some issues arise in the field of flame stabilization and safety. In this thesis, a heavy-duty gas turbine is considered, the FIAT TG-20. It was designed to be used with natural gas, hence after a preliminary study on the Base Load conditions, the study focuses on blended mixtures with hydrogen, in order to evaluate the potentials of the existing geometry.