The Story of California’s Advanced Clean Trucks Regulation

Key Takeaways

• CARB set zero‑emission truck sales targets starting 2024, rising to 2035.
• Regulation includes credit‑deficit trading, letting compliant firms sell excess credits.
• Stakeholder coalition pushed for stronger targets, outweighing industry objections.
• CARB granted truckmakers flexibility via credit purchases, not just vehicle sales.
• Data gathered on fleet operations fed future Advanced Clean Fleets rule.

Pulse Analysis

California has long been a testing ground for clean‑vehicle policy, and the Advanced Clean Trucks (ACT) regulation extends that legacy to the heavy‑duty sector. Adopted by the California Air Resources Board in 2020, ACT requires manufacturers to sell a growing share of zero‑emission trucks—battery‑electric or hydrogen fuel‑cell—starting in 2024 and climbing to a near‑full transition by 2035. The rule’s credit‑deficit trading mechanism creates a secondary market, allowing firms that fall short to purchase compliance credits from those that exceed their targets, thereby smoothing the industry’s adjustment curve.

The policy’s evolution was shaped by a vigorous stakeholder process. Environmental‑justice organizations, public‑health advocates, labor groups, and forward‑looking businesses formed a coalition that successfully lobbied for tighter sales percentages, leveraging new data on battery costs and early model roll‑outs. In response, the board granted legacy truckmakers additional compliance flexibility—primarily through credit trading—addressing concerns about charging infrastructure and upfront vehicle costs. Crucially, the regulation also required large‑entity reporting, generating a rich dataset on fleet composition, mileage patterns, and purchasing behavior that will inform the forthcoming Advanced Clean Fleets rule.

ACT’s impact reaches far beyond California’s borders. The regulation is currently embroiled in litigation after a 2025 congressional vote revoked its federal waiver, underscoring the political stakes of aggressive climate policy. Nonetheless, ACT provides a blueprint for jurisdictions seeking to accelerate zero‑emission freight, demonstrating how data‑driven targets, market‑based compliance tools, and inclusive stakeholder engagement can converge to drive systemic change. As other states and countries contemplate similar mandates, the lessons from California’s experience will shape the next wave of clean‑transport legislation.