This project was initiated to provide new and updated definitions at section 1.48-9 of the Income Tax Regulations for energy property eligible for the energy credit under 26 U.S.C. 48. Due to statutory amendments, Treasury Regulation section 1.48-9 does not currently reflect 26 U.S.C. section 48. We anticipate that the proposed regulations will also provide other rules applicable to energy property, such as rules for dual use property, application of the 80/20 Rule to retrofitted energy property, and eligibility of off-site components of energy property.