Abstract : Clear Air Force Station, located in the interior of Alaska where temperatures can drop as low as -60 deg This report addresses (1) the extent to which the Air Force evaluated options regarding the Clear Air Force Station combined heat and power plant and (2) what other options, if any, the Air Force considered before deciding on the alternative power source it selected. GAO reviewed the feasibility study; Department of Defense and Air Force guidance; and other analyses, contract information, and documentation related to the power plant. Fahrenheit, currently generates its own heat and power from a coal-fired combined heat and power plant. The station performs a critical radar mission for the Department of Defense, for which it is vital to have reliable sources of heat and power. Air Force Space Command has determined that the existing 50- year-old plant is operating inefficiently, and the Air Force plans to close the existing plant, after first connecting to the local power grid for electricity and constructing a new heat system for the administrative and residential areas of the installation. GAO was asked to review the Air Force s feasibility study and analyses of alternatives before the Air Force closes the plant. GAO also issued a restricted version of this report, which includes additional details on some estimated costs. In written comments on a draft of the restricted report, the Air Force concurred with GAO s observations.