Estimates of the costs and mitigation potential of climate change mitigation projects are incorrectly reported in the literature since they don't adequately account for costs of transactions, and for the role that barriers play in reducing the market penetration of projects. IES group is developing estimates of transaction costs of such projects in the US and abroad, and quantify the impact of barriers on mitigation potential. The analysis has resulted in two major reports on these two topics that are of interest to the research community engaged in integrated analysis of climate change.