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As a part of the EU integrated project CASTOR a 1 t/h CO2 absorption pilot plant has been erected at the 400 MW coal-fired Esbjerg power plant. The main purpose of the pilot plant is to demonstrate the post combustion capture technology in conjunction with a coal-fired power plant. Additionally, the pilot plant will be used to test the performance of new energy efficient solvents and to verify modelling work. The design of the pilot plant is based on a commercial CO2 production plant using alkanolamine as the absorbent. The pilot plant operates on a slipstream of the flue gas taken after the deNOx and desulphurisation plants. During the pilot plant’s first year, two 1000 hours test campaigns using monoethanolamine were conducted. Among others, the campaigns included tests to verify plant functionality and performance as well as a more detailed parametric study. This paper summarises the initial operation experience and some of the first results obtained during these campaigns