This work presents a study of different CO2 compression models. Various CO2 compression options widely used in the industry will be modelled through Aspen plus and energy requirement and heat available will be quantified and compared. An operating costs and capital costs assessment has been first conducted using Aspen Process Economics Analyzer. A heat integration equation for the potential transfer of heat available into electricity for all CO2 compression options has been used, and potential energy-saving and cost-saving have been quantified. The results show that the optimal option has a cost-saving of nearly 4.17dollars/t CO2 for the operating costs. This optimal option has also a power requirement of 61,302 kW and has an equipment cost of 0.17dollars/t CO2.