The present model is compared against published cost estimates (CAPEX) as well as levelised cost of CO 2 compression. For bench-marking purposes, data is sourced from two references . The first bench-marking is made against data from Hendriks et al. . They presented levelised cost estimates of a 4-stage compression process from 1 to 120 bar. They used simple equations Comparison between values calculated in the present study with those of ref. .