On December 4, 2024, the US Treasury and IRS issued final regulations (TD 10015) clarifying the definition of energy property and rules for the energy credit under Section 48 of the Internal Revenue Code. These regulations aim to provide clarity and flexibility for taxpayers in planning and compliance. Updates include modifications to the definition of qualified biogas property, rules for energy storage technology, energy property aggregation rules, and the application of prevailing wage and apprenticeship requirements. The regulations also address recapture rules, the 80/20 rule for retrofitted energy property, and the inclusion of qualified interconnection costs. The Final Regulations implement amendments made by the Inflation Reduction Act of 2022, offering guidance on determining eligibility for the energy credit. The article discusses key points such as clarifications on waste energy recovery property and energy storage technology eligibility for the investment tax credit. It explains the modifications made to ensure clarity and accommodate various taxpayer concerns regarding energy property qualifications.