This chapter aims at evaluating CCS equipped power generationin a power system context. Initially, the main power system servicesand mechanisms are reviewed. Decarbonisation poses transformationalchallenges associated with system reliability and operability to theenergy system. New approaches to evaluate power generation and storagetechnologies in a whole-systems context are discussed and demonstrated.CCS power plants are able to reduce the total system cost and leadto a least-cost decarbonisation of the power sector. Enhanced flexibilityin CCS power generation can provide additional value to the system.Research, policies, and markets should aim at explicitly evaluatingnew technology services to the power system, such as flexibility,low CO₂ emissions, or the provision of ancillary services.