A major challenge to the adoption of CCS is the high and uncertain capital investment required. Of the capture technologies in development, post-combustion capture (PCC) using amine scrubbing is the most mature. There has been extensive testing at pilot scale, and commercial-scale demonstration projects are in various stages . However, most CCS cost analyses in open literature rely on "simplified" cost estimates, as the costs of commercial-scale projects are generally not published in detail . There has been increasing awareness that for capture retrofit applications in particular, there can be significant costs to integrate the capture unit with the host site . These costs are dependent on the details of the host site, and are therefore frequently neglected in less rigorous studies. Comparing studies to explain the causes of major differences is an important part of understanding the true cost of capture .