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. Public Law 117-169, 136 Stat. 1818 (August 6, 2022), commonly known as the "Inflation Reduction Act", which made several changes to what is included in energy property under section 48. In addition to the updates to section 1.48-9 on the definition of energy property, these regulations 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. Additionally, proposed section 1.48-13 provides rules relating to the increased credit amount for prevailing wage and apprenticeship. Proposed section 1.6418-5(f) provides for notification and impact of recapture under section 48(a) (10)(C) of the Code.