Audit, Compliance and Risk Blog

In September 2025, California extended and amended authority for its statewide greenhouse gas (GHG) “cap and trade” program through 2045 – and rebranded it as “cap and invest.” The California Air Resources Board (ARB) has administered this program since 2012, as part of broader GHG reduction provisions created by 2006’s Assembly Bill (AB) 32. AB 32 initially committed the state to reduce total GHG emissions back to 1990 levels by 2020 (achieved in 2018); ARB’s latest GHG reduction scoping plan (issued in 2022), seeks to reduce statewide emissions to 85% below 1990 levels by 2045, achieving carbon neutrality. Subsequent legislation extended implementing authority for cap-and-trade and other related programs available to the California Air Resources Board (ARB) and other agencies through 2030. (I wrote about that extension (AB 398) HERE ).  The newest legislation (AB 2017 and Senate Bill (SB) 840) continues the state’s GHG reduction efforts by making further changes to ARB’s cap and trade authority. The rest of this note summarizes these changes.

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After nearly a decade of talking and planning, most of the northeast and middle Atlantic states (plus the District of Columbia) in the Transportation and Climate Initiative (TCI) have proposed a cap-and-trade program intended to reduce greenhouse gas (GHG) emissions from transportation. On October 1, TCI issued a “Framework for a Draft Regional Policy Proposal,” and on December 17 a formal “Draft Memorandum of Understanding (MOU)” that jurisdictions can sign to formalize their participation. If things go well, the formal program should begin in 2020.

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One of the longest running sub-national greenhouse gas (GHG) control efforts in the U.S. has been the Regional Greenhouse Gas Initiative (RGGI) program. RGGI provides a cap-and-trade program covering GHG emissions from targeted fossil fuel power plants in participating northeastern states. The program t has just been revised and extended through 2030.

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Since 2012, California has administered a “cap-and-trade” program, setting total greenhouse gas (GHG) emission limits from selected major emitting sectors and creating tradeable emission permits and offsets to provide flexibility and encourage innovation. The program was created under authority of the state’s 2006 “AB 32” legislation, which focuses on reducing statewide GHG emissions by 2020. This authority would have expired in 2020, but new legislation extends the program until 2030. In order to secure enough votes for the extension, legislative leaders and Governor Brown agreed to statutory changes in this program and related air quality programs.

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