The study, "Replacement Costs of Domestic Crude Oil," has been undertaken by Lewin and Associates, Inc., on behalf of IDE Fossil Energy/Office of Planning and Environment (OPE). It serves as input to the ongoing analysis of high risk, long-term technology options in fossil energy being cumulated by the OPE. The specific purpose of the study is to provide information that will assist in planning for an efficient; transition from conventional supplies for future energy sources. While a number of alternative price-supply futures are examined in the study, no judgment is made as to the likelihood or exact timing of their occurrence. This study is neither a prediction nor a projection but rather is designed to explore and seek understanding of alternative assumptions about the domestic resource extraction technologies, and various constraints and their impact on the costs and availability of domestic crude oil supplies.