EPA Phase 3 Rule
Overview
The U.S. Environmental Protection Agency’s (EPA) Phase 3 Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles (HDVs) represent a vital step toward reducing emissions and advancing the transition to zero-emission freight. The standards, which limit the amount of carbon dioxide that HDVs can emit annually beginning in model year 2027, will help provide a clear market signal for investment in zero-emission HDV technology and charging infrastructure. This explainer provides an overview of the standards and their impacts and details how the standards were generated, how they compare to previous standards, and the various flexibilities and provisions that may impact their overall effectiveness.