AB154 (Climate Corporate Data Accountability Act) requires large business entities that do business in California and meet a $1 billion annual revenue threshold to annually disclose Scope 1, Scope 2, and (on a phased schedule) Scope 3 greenhouse gas emissions and to obtain independent third‑party assurance. The State Air Resources Board (the state board) must adopt implementing regulations, may contract with a nonprofit emissions reporting organization to run a public digital platform, and must recover its costs through an annual fee deposited into a new Climate Accountability and Emissions Disclosure Fund.
The law creates enforceable consequences for non‑filing or late filing (administrative penalties up to $500,000 per reporting year) while carving out limited defenses for good‑faith Scope 3 misstatements, sets phased assurance quality requirements, and exempts its implementing regulations from CEQA. For compliance officers and corporate legal teams, AB154 turns previously voluntary, supply‑chain emissions information into a regulated disclosure program with direct operational and assurance implications across procurement, reporting, and investor relations.
At a Glance
What It Does
The state board must adopt regulations requiring covered entities to disclose Scope 1 and Scope 2 emissions beginning in 2026 and Scope 3 emissions on a schedule set by the board (phase‑in begins 2027). Disclosures must conform to the Greenhouse Gas Protocol (or a board‑adopted alternative after 2033) and be supported by independent assurance engagements whose required level increases over time.
Who It Affects
A "reporting entity" is any partnership, corporation, LLC, or similar business formed under U.S. law that does business in California and had prior‑year total revenues exceeding $1 billion. The rule therefore hits large multinationals with California operations, their upstream and downstream suppliers (for Scope 3 data), third‑party assurance providers, and any nonprofit entity contracted to operate the state’s reporting platform.
Why It Matters
This is one of the first state laws to mandate full‑value‑chain (Scope 1–3) disclosure with phased third‑party assurance and monetary penalties, shifting material emissions data from voluntary sustainability reports into an auditable regulatory record and increasing demand for verifiers and supplier data flows.
More articles like this one.
A weekly email with all the latest developments on this topic.
What This Bill Actually Does
AB154 requires the state board to write regulations that force covered companies to report their full value‑chain greenhouse gas emissions and to obtain third‑party assurance. The reporting standard must align with the Greenhouse Gas Protocol initially; the board may adopt a different globally recognized standard after a statutory review beginning in 2033.
The board can contract with a nonprofit emissions reporting organization to receive disclosures and to host a public digital platform that displays company data in machine‑readable and human‑friendly formats.
The law phases in obligations: companies must publicly disclose Scope 1 and Scope 2 emissions for the prior fiscal year starting in 2026, and the board will set the schedule for Scope 3 disclosures beginning in 2027. The statute allows parent‑level consolidation (so subsidiaries can be covered through a parent report) and expressly permits the use of primary and secondary data—including industry averages and proxy data—when calculating Scope 3 emissions, subject to the Protocol’s guidance.Assurance is mandated and phased: limited assurance for Scope 1 and 2 begins in 2026, with a requirement to escalate to reasonable assurance by 2030; the board will evaluate when and how to require third‑party assurance for Scope 3 (limited assurance for Scope 3 may begin in 2030).
The board must set qualifications for assurance providers, seek to avoid duplicate assurance engagements, and plan timelines that reflect data availability and assurance capacity.The statute funds administration through an annual fee on reporting entities; fees go into a continuously appropriated Climate Accountability and Emissions Disclosure Fund to cover the state board’s costs. The board may impose administrative penalties (capped at $500,000 per reporting year) for nonfiling, late filing, or failures to meet requirements, but the statute protects entities from penalties for Scope 3 misstatements made with a reasonable basis and in good faith; between 2027 and 2030 penalties for Scope 3 are limited to nonfiling.
The statute exempts its regulations from CEQA and limits application to the University of California only if the Regents opt in by resolution.
The Five Things You Need to Know
A reporting entity is any business entity with prior‑year revenues over $1,000,000,000 that does business in California (threshold based on prior fiscal year revenues).
Scope 1 and Scope 2 disclosures are required beginning in 2026; Scope 3 disclosures are phased in starting in 2027 on a schedule the state board will set.
The law mandates third‑party assurance: limited assurance for Scope 1 and 2 beginning in 2026 and a move to reasonable assurance for those categories by 2030; the board may require limited assurance for Scope 3 starting in 2030 after a 2026–2029 review period.
The state board may impose administrative penalties up to $500,000 per reporting year for violations (with statutory guidance to consider good faith and prior compliance); Scope 3 misstatements made with a reasonable basis and in good faith are explicitly shielded from penalties.
The state will create a public, searchable digital platform (operated by the board or a contracted nonprofit emissions reporting organization) and fund the program via an annual fee deposited into the Climate Accountability and Emissions Disclosure Fund, continuously appropriated to the board.
Section-by-Section Breakdown
Every bill we cover gets an analysis of its key sections.
Who is a reporting entity
This provision sets the applicability test: any partnership, corporation, LLC, or similar business formed under U.S. law that does business in California and had more than $1 billion in total revenues in the prior fiscal year. Applicability based on prior fiscal year revenue creates a clear bright‑line for compliance officers to screen their legal entities, but it also means large subsidiaries can be covered by consolidated parent reporting if the parent elects to include them.
Regulatory duty and phased disclosure timeline
The state board must adopt regulations requiring annual public disclosure of Scope 1 and 2 emissions starting in 2026 and Scope 3 disclosures beginning in 2027 on a schedule to be set by the board. The board must balance data timeliness against the reality that Scope 3 data often arrives late, and the statute instructs the board to revisit deadlines by January 1, 2030 to better align Scope 3 timing with Scope 1 and 2 disclosures.
Accounting standard and consolidation rules
The bill anchors reporting to the Greenhouse Gas Protocol Corporate and Scope 3 standards, permits consolidation at the parent level, and explicitly allows acceptable use of primary and secondary data (industry averages, proxy data) for Scope 3 calculations. The board must survey available accounting standards starting in 2033 and can adopt an alternative global standard if it finds one superior, but any switch will trigger a new regulation cycle to preserve conformance and comparability.
Assurance requirements and provider qualifications
Assurance engagements must be performed by independent third‑party providers with demonstrated GHG expertise. The statute phases assurance quality: limited assurance for Scope 1 and 2 in 2026, moving to reasonable assurance in 2030; the board will evaluate Scope 3 assurance requirements between 2026 and 2029 and may require limited assurance for Scope 3 from 2030. The board must set provider qualifications and consider provider capacity to avoid forcing entities to hire multiple verifiers.
Fee structure and new fund
Reporting entities pay an annual fee sufficient to cover the board’s implementation and administrative costs; fees are deposited into the newly created Climate Accountability and Emissions Disclosure Fund, which is continuously appropriated to the board. The statute lets the board adjust fees for inflation (California CPI) and prohibits spending the fund on anything outside the statute’s enumerated purposes.
Independent research and public digital platform
The board must contract with an academic or national lab to prepare a public report analyzing disclosures in the context of state climate goals and must publish both that report and the raw disclosures on a digital platform. The platform must present entity data and aggregated views, make datasets downloadable, and post disclosures within 90 days of receipt; contracting for platform services is treated as a non‑IT services procurement for state contracting rules.
Enforcement, penalties, and CEQA exemption
The board gets administrative enforcement authority for nonfiling, late filing, or other failures, with penalties capped at $500,000 per reporting year; in assessing penalties the board must weigh prior compliance and good‑faith efforts. The law explicitly exempts regulations adopted under this section from CEQA and provides that reporting penalties for Scope 3 between 2027 and 2030 are limited to nonfiling, while misstatements made with a reasonable basis and in good faith are not penalized.
This bill is one of many.
Codify tracks hundreds of bills on Environment across all five countries.
Explore Environment in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Investors and financial analysts — gain standardized, auditable full‑value‑chain emissions data that improves materiality assessments, comparability across firms, and integration of climate risk into valuation models.
- Environmental justice and public interest groups — receive public, machine‑readable emission datasets and a state‑mandated report tying corporate emissions to state climate goals, strengthening oversight and advocacy.
- Procurement and sustainability teams within large buyers — clearer supplier emissions profiles will enable prioritized supplier engagement and contractual requirements to reduce Scope 3 footprints.
- State agencies and planners — centralized, public emissions data improves state climate planning, modeling and enforcement coordination without relying solely on voluntary disclosures.
Who Bears the Cost
- Reporting entities with >$1B revenue — face increased accounting, assurance, and disclosure costs; they must gather upstream and downstream data, hire assurance providers, and possibly change internal systems to meet timelines.
- Upstream suppliers and small businesses — will likely bear the operational burden of producing Scope 3 data for large buyers, with associated administrative costs and potential contractual pressures.
- Third‑party assurance providers and verifiers — need to scale capacity and build GHG expertise quickly; the market may experience shortages and higher fees during the phase‑in.
- The state board — must stand up program infrastructure and oversight initially, manage procurement and vendor oversight, and monitor assurance qualifications (though fees reimburse its costs).
Key Issues
The Core Tension
AB154 pits the public’s interest in timely, auditable, full‑value‑chain emissions transparency against the technical and economic limits of measuring and assuring Scope 3 emissions: the statute seeks to force comparable, public disclosures quickly while simultaneously acknowledging that data quality, verifier capacity, and supplier cooperation will be incomplete for years, creating a hard trade‑off between speed and reliability.
The statute pushes a difficult measurement problem — Scope 3 emissions — into a regulatory framework before the assurance market and data ecosystems are mature. Allowing industry averages and proxy data for Scope 3 makes reporting feasible, but it also reduces comparability and increases the risk that reported figures will vary in quality across firms and sectors.
The law attempts to navigate this by phasing in Scope 3 reporting, limiting penalties for early misstatements, and scheduling periodic reviews of assurance qualifications and standards; implementation risk remains high for sectors with fragmented supply chains.
Exempting the regulations from CEQA expedites program rollout and reduces litigation risk to the board, but it also removes a procedural check that could surface localized environmental impacts tied to corporate activities. The funding design — fee‑based and continuously appropriated — prevents appropriation risk but depends on accurate fee setting and may create political tension if costs are misestimated.
Finally, the law leaves open several operational questions: how confidentiality claims will be handled on the public platform, how the board will coordinate with federal reporting regimes, and how it will prevent duplicate assurance burdens while ensuring verifier independence and capacity.
Try it yourself.
Ask a question in plain English, or pick a topic below. Results in seconds.