Information on the benefits of completing NEPA analyses is largely qualitative. EAs and CEs generally cost less than EISs, according to CEQ and federal agencies. For context, a 2003 task force report to CEQ-the only available source of governmentwide cost estimates-estimated that a typical EIS cost from $250,000 to $2 million. According to DOE data, its median EIS contractor cost for calendar years 2003 through 2012 was $1.4 million. DOE officials told GAO that they track the money the agency pays to contractors to conduct NEPA analyses. However, the Department of Energy (DOE) tracks limited cost data associated with NEPA analyses. Agencies do not routinely track the cost of completing NEPA analyses, and there is no governmentwide mechanism to do so, according to officials from CEQ, EPA, and other agencies GAO reviewed. Little information exists on the costs and benefits of completing NEPA analyses. A 2011 Congressional Research Service report noted that determining the total number of federal actions subject to NEPA is difficult, since most agencies track only the number of actions requiring an EIS. The Environmental Protection Agency (EPA) maintains governmentwide information on EISs. Projects requiring an EIS are a small portion of all projects but are likely to be high-profile, complex, and expensive. Agencies do not routinely track the number of EAs or CEs, but the Council on Environmental Quality (CEQ)-the entity within the Executive Office of the President that oversees NEPA implementation-estimates that about 95 percent of NEPA analyses are CEs, less than 5 percent are EAs, and less than 1 percent are EISs. NEPA generally requires federal agencies to evaluate the potential environmental effects of actions they propose to carry out, fund, or approve (e.g., by permit) by preparing analyses of different comprehensiveness depending on the significance of a proposed project's effects on the environment-from the most detailed Environmental Impact Statements (EIS) to the less comprehensive Environmental Assessments (EA) and Categorical Exclusions (CE). Governmentwide data on the number and type of most National Environmental Policy Act (NEPA) analyses are not readily available, as data collection efforts vary by agency.