Carbon capture and storage is significant technology in the limitation of greenhouse gases in the atmosphere worldwide. Carbon capture and storage consists of four general processes within the system: carbon capture, carbon compression and transport, carbon injection and carbon storage. All the processes require energy to operate the system and therefore produce additional amount of carbon dioxide emissions. The energy penalty decreases the efficiency of the plant: the total conditional efficiency of the CCS system is often characterised as difference between CO2 emissions eliminated by CCS and CO2 emissions produced by CCS processes. Additionally, CCS is associated with environmental, safety and human consequences because of CO2 leakage from storage sites and its impact to ecosystems, stability of geological layers and changes in geological properties of formations, etc. This paper is aimed at the identification and optimisation of costs and the environmental impact categories caused by energy consumption at a CCS power plant for the realization of carbon compression, pipeline transport and carbon injection phases.