NISTIR 85-3273-25 (Rev. 5/10) Energy Price Indices and Discount Factors for Life-Cycle Cost Analysis – 2010 Annual Supplement to Amy S. Rushing NIST Handbook 135 and Joshua D. Kneifel NBS Special Publication 709 Barbara C. Lippiatt U.S. DEPARTMENT OF COMMERCE Technology Administration National Institute of Standards and Technology Prepared for United States Department of Energy Federal Energy Management Program April 2005 May 2010