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California's tighter carbon cap takes effect

California's tighter carbon cap takes effect

Rule Changes

Amended Cap-and-Invest rules cut the cap 11% a year this decade and lock the market in through 2045

Yesterday: Amended Cap-and-Invest Regulation takes effect

Overview

Updated 3 hours ago

California's largest polluters began operating under a sharply tighter carbon cap on September 1. The amended Cap-and-Invest Program, previously called Cap-and-Trade, removes 118 million pollution allowances through 2030, shrinking the cap 11% each year this decade.

The rule locks a declining emissions limit in through 2045 and covers 80% of the state's greenhouse gases. It doubles funding for industrial decarbonization to $4 billion and adds $800 million to cushion compliance costs. The open question is whether steeper cuts arrive without pushing electricity and gas prices higher.

Why it matters

A tighter cap on 80% of California's emissions means higher pollution costs for utilities, refiners, and manufacturers — costs that can reach household bills.

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Key Indicators

118 million
Allowances removed from cap budgets through 2030
Guaranteed removal tightens the cap to align with California's 2030 climate targets.
11%
Year-over-year cap decline this decade
The allowance budget shrinks 11% annually through 2030, the steepest decline in program history.
7%
Average annual cap decline, 2031-2045
The cap keeps shrinking by roughly 7% per year after 2030 under the 2045 framework.
$4 billion
Manufacturing Decarbonization Incentive Fund
Doubled from its prior size to support industrial emission-reduction investments.
$10 billion
Electricity bill credits for Californians
Part of the 80% of allowance value dedicated to directly benefit households.
80%
Share of state emissions covered
Covered entities include utilities, fuel suppliers, refiners, and large industrial facilities.

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People Involved

Organizations Involved

Timeline

September 2006 January 2029

9 events Latest: Yesterday
Tap a bar to jump to that date
  1. Offset protocol update deadline

    Upcoming Deadline

    CARB must update all compliance offset protocols under SB 840.

  2. Offsets study deadline

    Upcoming Deadline

    SB 840 deadline for CARB's study of the Compliance Offsets Program.

  3. Amended Cap-and-Invest Regulation takes effect

    Latest Regulation

    Amended Cap-and-Invest Regulation takes effect, ahead of vintage 2027 allocation.

  4. OAL approves the rulemaking

    Regulation

    OAL approves the rulemaking and files it with the Secretary of State.

  5. Rulemaking submitted to OAL

    Regulation

    CARB submits the final rulemaking package to the Office of Administrative Law.

  6. CARB adopts amended regulation

    Regulation

    CARB board adopts the amended Cap-and-Invest Regulation at a two-day hearing.

  7. Newsom signs AB 1207 and SB 840

    Legislation

    Newsom signs AB 1207 and SB 840, extending the carbon market through 2045.

  8. AB 398 extends program through 2030

    Legislation

    Legislature extends cap-and-trade to 2030 via AB 398 with a two-thirds vote.

  9. AB 32 authorizes California's carbon market

    Legislation

    California enacts AB 32, authorizing the state's landmark cap-and-trade program.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

November 1990-July 2008

US Acid Rain Program SO2 trading (1990-2008)

The 1990 Clean Air Act amendments created the first major US cap-and-trade system, capping sulfur dioxide emissions from power plants. Emissions fell faster and at lower cost than the Environmental Protection Agency predicted.

Then

SO2 emissions dropped sharply within a decade, validating cap-and-trade as a policy tool.

Now

A 2008 federal court decision vacated the follow-on Clean Air Interstate Rule, creating years of market uncertainty and showing how legal challenges can disrupt trading programs.

Why this matters now

The program proved the mechanism works; its legal turmoil previews the risk of a court challenge to California's amendments.

September 2008-present

Regional Greenhouse Gas Initiative (2009-present)

Nine northeastern US states launched the Regional Greenhouse Gas Initiative in 2009, capping power-sector emissions and auctioning allowances. Member states tightened the cap over time and added an Emissions Containment Reserve that automatically withholds allowances when prices fall below a set level.

Then

Emissions fell across the region while auction revenue funded efficiency programs and consumer bill credits.

Now

RGGI became the main US example of a regional carbon market that pairs a shrinking cap with explicit cost management.

Why this matters now

California's dedication of 80% of allowance value to consumer benefits and its cost-containment mechanisms follow the same playbook.

March 2018-January 2021

EU ETS Phase 4 reform (2018-2021)

After a decade of surplus allowances pushed EU carbon prices below €10 per tonne, the European Union tightened its emissions cap, created the Market Stability Reserve to absorb excess allowances, and accelerated the annual cap reduction. Prices climbed above €80 per tonne within four years.

Then

Higher carbon prices made coal power uneconomic and accelerated the bloc's shift to renewables.

Now

The reform became the reference point for cap tightening in other carbon markets.

Why this matters now

California's removal of 118 million allowances applies the same logic: shrink surplus supply to make the price signal bite.

Sources

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