Fortum Oslo Varme (FOV) decided (in July 2018) to build a 1:350 scale pilot plant to demonstrate that the selected Shell's CANSOLV capture technology using solvent DC-103 is suitable for cleaning CO₂ from the exhaust gases of the Klemetsrud (Oslo, Norway) waste to energy (WtE) plant. This paper presents the most important measurement data and results from a pilot plant testing campaign from March to December 2019. The project stated requirements for the successful completion of the first pilot plant campaign were at least 2000 operational hours and total amine emissions lower than 0.4 ppmv on average over the last 500 h of testing. Emphasis is on the online emission measurement results both with and without an aerosol emissions mitigation system located downstream of the capture unit. The impact of perturbations in the plant operating conditions and inlet gas quality is discussed, in particular the particulates content. The pilot plant campaign achieved its primary purpose of demonstrating low amine emissions. It also produced important data on absorbent degradation in actual operation on WtE flue gas while confirming other performance parameters such as CO2 capture efficiency, steam consumption and CO2 product purity. Thus, it can be concluded that the all requirements according to objectives of the pilot campaign were successfully met.