There is apparently no data available in the open literature and public domain on actual installed costs of CO 2 compression systems for high pressure / dense phase pipeline transport, despite a reasonable amount of EOR projects both in the US and Australia making direct comparison between the implemented cost model and real data challenging. Nevertheless, in the following we take a step-wise approach in building confidence in the implemented cost model by first reviewing available data for compressor costs from vendor data, to estimation of full compression system total plant cost and comparison against literature and other software cost models, to finally comparing levelised cost estimates against published studies.