In 2007 EPRI released its first Prism and MERGE analyses, providing a technically and economically feasible roadmap for the electricity sector as it seeks to reduce its greenhouse gas emissions. The Prism analysis provided a comprehensive assessment of potential CO2 reductions in key technology areas of the electricity sector. The MERGE analysis identified the optimum economic technology portfolio in response to a given CO2 emissions constraint.
The 2009 update reflects economic and technological changes that have the potential to affect projected emissions and the technologies to address them. This update also includes new technologies and analysis features.