For case comparison the total CAPEX is used as one indicator. However, the total CAPEX does not consider annualised costs. Annual costs include several other factors such as fixed operations and maintenance cost (FOPEX), variable operations and maintenance cost (VOPEX) in addition to the annualised CAPEX. A Levelised Cost, for the purpose of this study referred to as Levelised Cost of CO 2 Compression, LCOCC, factors this in. Especially the variable cost of electricity required for compression, refrigeration and pumping is an important factor. For example a high CAPEX case with low power requirement may provide a lower LCOCC than a low CAPEX case with high power requirement (depending on the difference in CAPEX and the cost of electricity). In this study we use the following simplified definition of levelised cost in analogy with NREL's Levelised Cost of Energy (LCOE) which assumes overnight capital cost and O&M costs being invariant over the years . The LCOCC is given as: