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Welcome to ZEV Help! Your Guide to Zero-Emission Commercial Vehicles

High Priority and Federal Fleets

⚠️ Important Policy Update – January 2025

In January 2025, the California Air Resources Board (CARB) withdrew its EPA waiver request for the Advanced Clean Fleets (ACF) regulation's fleet purchase requirements. Without the EPA waiver, the ACF mandates for high-priority and federal fleets — including ZEV purchase and acquisition requirements beginning January 1, 2024 — cannot be enforced by California. Monitor ARB.CA.gov for the latest enforcement status and compliance guidance.

⚠️ Important Policy Update – January 2025

In January 2025, the California Air Resources Board (CARB) withdrew its EPA waiver request for the Advanced Clean Fleets (ACF) regulation's fleet purchase requirements. Without the EPA waiver, the ACF mandates for high-priority and federal fleets — including ZEV purchase and acquisition requirements beginning January 1, 2024 — cannot be enforced by California. Monitor ARB.CA.gov for the latest enforcement status and compliance guidance.

Applies to any entity that owns, operates or directs the operation of one or more vehicles in California on or after Jan 1 2024 ( High Priority Fleets) AND:

Any entity with $50+ million annual revenue (Nationwide) per preceding calendar year

(or) Any entity that owns or controls 50+ vehicles

(or) A fleet owner whose combined fleet under common ownership & control totals 50+ vehicles

(or) Any federal agency that operates 1+ vehicles in California

California Fleet 

 If a vehicle is operated in California at any time during a calendar year, it will be considered part of California fleet for the entire calendar year (only ‘California Fleet’ is subject to ACF )

California Operation 

 No time or minimum miles requirement = 

“Single truck crossing the CA border single time in a year on duty or off duty”

High Priority and Federal Fleets Compliance Pathways

>8500 lbs vehicle added to a fleet must be a ZEV (Jan 1 2024) :

  • All vehicles beyond useful life must be removed from the fleet
  • Vehicle’s “useful life” is latter of
    • 13 years old, or 800,000 miles (not to exceed 18 years)
  • New/Used ICE Vehicles can be purchased only with exemption and must be CA certified
ZEV milestone and ZEV add-on compliance timelines under Advanced Clean Fleets

Fleets can purchase ICE Vehicles as long as ZEV targets are met :

  • New Any new ICE vehicle added to the California fleet must be certified to applicable California emissions standards and emissions related requirements
  • Used Any ICE vehicle purchased for the California fleet on or after January 1, 2024, must have a 2010 through 2023 model year engine or a 2024 model year or newer engine certified to applicable California emissions standards and emissions related requirements.
Link to ZEV Additions OR ZEV Milestones Tables

Reference: https://ww2.arb.ca.gov/our-work/programs/advanced-clean-fleets