In Equation , CRF is the capital recovery factor; T P C is the overnight capital cost as calculated from Equation ; O&M f ixed is the yearly fixed Operations and Maintenance cost invariant of the plant load/capacity and O&M variable is the yearly Operations and Maintenance cost that scales with plant load. The denominator in Equation is the yearly amount of pressurised CO 2 , which we set as the nominal mass flow (kg/s) integrated over the year, assuming 100% availability i.e., 8,760 hours at the design rate. The variable O&M costs will, for simplicity, be set at the cost of electricity to power compressor, and eventual refrigeration / pumping. The capital recovery factor is defined as: