This chapter explores the integration of gas turbine combined-cycle (GTCC) power generation systems with plasma-based renewable energy technologies. In liquefied natural gas (LNG)-fueled GTCC plants, achieving zero carbon dioxide (CO2) emissions is feasible if the energy efficiency of the non-thermal plasma (NTP) CO2 reduction process reaches at least 49%. The chapter provides an in-depth analysis of zero-emission power plants, covering key topics such as the fundamentals of GTCC systems, carbon monoxide (CO)-based gas turbines, and NTP conversion technologies. These technologies facilitate the transformation of CO2 into synthetic fuel gases, primarily consisting of CO, through the recirculation of exhaust gases. The discussion focuses on methods to achieve CO2 reduction in a self-sustaining manner at ambient temperature and atmospheric pressure. Specifically, the process of converting CO2 into CO via NTP-based reduction techniques is explained. Experimental evaluations were conducted to assess the CO2 reduction performance using various gas mixtures. Initially, CO2 is adsorbed from a nitrogen-CO2 mixture (approximately 10% CO2 concentration) onto an adsorbent material. Following adsorption, the desorbed CO2 is processed using NTP, achieving a concentration increase to 10–22% under similar conditions. Laboratory tests have demonstrated that NTP technology can achieve an energy efficiency of 20%. These results indicate that an efficiency of 49% could be realized for GTCC applications by scaling the NTP system to an industrial level. The chapter concludes with key findings and a set of exercises for further understanding.