The first case studied is a case where only compression is considered from 1.5 to 150 bar i.e., no liquefaction/pumping. The effect of number of compressor stages is studied in combination with different inter-stage pressure drop being applied to investigate the effect of this parameter, i.e. pressure drop, on the number of compression stages. For this case, a CO 2 flow of 100 kg/s is considered and an isentropic compressor efficiency of 80% is applied. Compressor discharge cooling is achieved by means of air-cooled heat exchangers with a discharge temperature of 38 • C and an ambient air temperature of 23 • C. For the techno-economic analysis 20 years lifetime, an interest rate of 8%, an annual fixed OPEX of 4% of total CAPEX, a capacity factor, CF , of 1 and an electricity cost of 65 USD/MWh are considered. The CEPCI index is set to 800.6 corresponding to approx. mid 2023. This CEPCI index is used throughout the remaining sections of the present study.