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Advanced Clean Fleet

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2026 status update: CARB withdrew its request for the federal waiver needed to enforce Advanced Clean Fleets on private high-priority and drayage fleets in January 2025. The requirements for state and local government fleets remain in effect. See the 2026 Regulation Tracker.
⚠️ 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 fleet operations mandates (drayage, government fleets, high-priority fleets) cannot be enforced by California. The manufacturer zero-emission sales mandate (ACT rule) remains separately in effect. Monitor ARB.CA.gov for the latest developments.

Row of Class 8 semi-trucks parked at a fleet depot loading dock
CARB has developed their Advanced Clean Fleets (ACF) rule to drive zero-emission vehicle (ZEV) adoption in California.

CARB Advance Clean Fleet is a Fleet requirement effective Oct 1 2023.

It has two elements:

  1. Manufacturer sales mandate :
    • Manufacturers may sell only zero-emission medium- and heavy-duty vehicles starting in 2036.
  2. Fleet operations:
    • Zero- emissions registration requirements
    • Zero-emissions purchase requirements

The ACF regulation applies to fleets performing:

    • drayage operations,
    • those owned by State, local, and federal government agencies, and
    • high priority fleets

Requirements for ZEV Additions

Table summarizing CARB Advanced Clean Fleets requirements, part 1

Requirements for ZEV Milestones

Table summarizing CARB Advanced Clean Fleets requirements, part 2