![]() Mexico’s greenhouse gas (GHG) emissions from the electricity sector were 126.6 MtCO 2eq, corresponding to 19.0% of total national emissions ( INECC, 2015). Therefore, these plants might need at least a similar carbon tax value to ensure their operation during their useful life. Finally, from the findings of this research, it is concluded that the CAC for NOAK plants is expected to be, in the best scenario, as low as $69/tCO 2. At an 85% capture level, the CAC for the conventional NOAK NGCC plant is $104.1/tCO 2 maintaining this same CAC value, the carbon capture rate could increase from 85% to 90.8% if EGR configuration is implemented. EGR at 85% capture level showed the best economic performance among the study cases evaluated, with a CAC equal to $102.5/tCO 2. The results showed that NOAK plants could potentially decrease the levelized cost of electricity (LCOE) by 10%–11%, and the CAC by 21%–23%, compared with first-of-a-kind (FOAK) plants. A hybrid method combining engineering-economic and experience-curve approaches was used to estimate the costs of Nth-of-a-kind (NOAK) plants. ![]() Several critical variables influencing the overall cost of the plant were considered, such as the work required for solvent regeneration ( W r e g e n), technology maturity, learning rate, carbon tax credit, and carbon capture level (85%, 90%, and 95%). A thermo-economic analysis was performed considering the second-law efficiency for the CO 2 separation process ( η 2 n d ) and the CO 2 avoided cost (CAC) as main indicators. This work aims to analyze the cost projection of natural gas combined cycles (NGCC) with post-combustion carbon capture (PCC) technology for two promising power plant configurations, namely: conventional NGCC and exhaust gas recirculation (EGR). 2Instituto Mexicano Del Petróleo, Dirección de Investigación en Exploración y Producción, Gerencia de Herramientas y Sistemas para Pozos e Instalaciones, Eje Central Lázaro Cárdenas 152, Mexico City, Mexico.1Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México (UNAM), Mexico City, Mexico.Díaz-Herrera 1* † Ascención Romero-Martínez 2 Gabriel Ascanio 1 †
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