A Stress Test for California Carbon Pricing

Key Takeaways

• CARB's Plan B adds billions in free allowances for refineries.
• Allowances per barrel rise from 2.25 to over 6.1 under Plan B.
• Expanded free permits could depress carbon prices and spur leakage.
• Lack of additionality criteria risks inefficient subsidy spending.

Pulse Analysis

California’s cap‑and‑trade system has long been a model for sub‑national climate policy, but it now faces a perfect storm of economic and political pressures. Gasoline prices hovering around $6 a gallon have given refiners unprecedented leverage, prompting the closure of facilities like Valero’s Benicia plant. In response, the California Air Resources Board (CARB) drafted a revised framework—Plan B—that injects a multi‑billion‑dollar Manufacturing Decarbonization Incentive (MDI) into the market. By allocating up to 6.1 free emission allowances per barrel for qualifying refineries, the plan aims to cushion industry while preserving the state’s emissions‑reduction mandate.

The economic mechanics of Plan B are straightforward yet consequential. Adding a large tranche of free permits expands the effective supply of allowances, which, under a binding cap, translates into lower carbon prices. A weaker price signal reduces the financial incentive for firms to invest in low‑carbon technologies, potentially slowing the decarbonization trajectory. Moreover, because California’s market covers only a slice of national industrial output, generous free allocations risk encouraging “leakage”—the relocation of emissions‑intensive production to jurisdictions with looser regulations. The plan also blurs the line between a true cap‑and‑trade system and a de‑facto carbon tax, as the price ceiling could convert the cap into a fixed tax if allowance volumes swell beyond the intended limit.

Policymakers can mitigate these downsides by tightening the link between subsidies and verified emissions reductions. Shifting the MDI from a capital‑expenditure reimbursement to an emissions‑additionality metric would ensure that public funds reward only projects that would not occur otherwise. Introducing a competitive scoring system for projects could prioritize the lowest‑cost abatement opportunities, while standardized reporting would build a data foundation for future policy tweaks. By refining the design, California can preserve the credibility of its carbon market, protect industrial competitiveness, and maintain its leadership in climate‑focused market mechanisms.