While Fossil-fuel-fired gas turbines remain the most reliable approach of power production, strict regulations and Acts have been imposed to limit NOx and carbon emissions. Innovative techniques have become resorts for the power generation industry to overcome such a low level of tolerance. The emerging concept of CO2-Argon-Steam Oxy-Fuel (CARSOXY) power generation has theoretically proven to increase gas turbine cycle efficiency whilst eliminating NOx emissions. Nevertheless, facilitating a higher level of technology maturity of CARSOXY gas turbines is essential to promote this technique to the industry within economically feasible scenarios while considering technical aspects of CARSOXY combustion. This thesis covers multidisciplinary aspects to facilitate further studies on CARSOXY, the performance of CARSOXY gas turbines under variable operation conditions and cycle arrangements, the production of CARSOXY, the techno-economic sustainability of CARSOXY and flame characterization. This will aid to bring CARSOXY to more mature status. A parametric study for several CARSOXY gas turbine cycles has been conducted to identify the ultimate working conditions for each cycle with respect to cycle efficiency. A cycle has been suggested for each range of working conditions. Further increase in CARSOXY cycle efficiency is promised using a newly suggested CARSOXY blend. CARSOXY gas turbines face the technical and economic challenges of conventional engineering practices for argon and carbon dioxide productions. Therefore, this thesis proposes a novel approach of continuously providing a gas turbine with the required molar fractions of CARSOXY blend. The elegance of this approach appears as an opportunity to use it in sites where ammonia is produced whilst proving its techno-economic sustainability. Finally, this thesis experimentally assesses CARSOXY in comparison to a CH4/air flame. OH Chemiluminescence integrated with Planar-Induced Fluorescence imaging techniques have been utilized to study flame stability, and flame geometry over a range of operation conditions. Results from this thesis provide a baseline investigation of CARSOXY gas turbines to be adopted by developers and manufacturers in the future.