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Client Alert

How California’s Sweeping New Climate Laws May Impact Your Business

October 17, 2023

by Megan J. Houdeshel and Kayla Race

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California recently enacted two sweeping and unprecedented laws that will require virtually all large companies who do any amount of business in California in any industry or sector to disclose their direct and indirect greenhouse gas (GHG) emissions (S.B. 253) and the financial risks they face as a result of climate change (S.B. 261). While there is existing precedent for more limited versions of these concepts, the breadth of California’s two new laws is much farther reaching, applying to a much wider array of businesses and requiring a broader scope of disclosures. The first reporting deadlines for these new laws is 2026—a date that is sure to sneak up fast, given the size of effort these laws will require in gathering, analyzing, and reporting data. Clients in every industry that do any amount of business in California and have more than $500 million in gross annual revenue—as well as smaller entities that may be asked to supply supporting information to directly regulated entities to whom they supply or purchase products or services— should take note and start preparing now. Here’s what we know, and don’t know, about both laws.

Greenhouse Gas Emissions Reporting (S.B. 253)

Who Must Report

S.B. 253, the Climate Corporate Data Accountability Act, applies to any U.S. company that made more than $1 billion in total annual revenue in the prior fiscal year and “does business in California,” regardless of where the company is headquartered or formed, regardless of whether it is public or private, and regardless of industry or economic sector. The bill does not define what it means to “do business in California.” If the state interprets this term as it does in other statutes, it’s likely to be far-reaching. For example, the California Revenue and Tax Code §23101 defines “Doing business” in California as “actively engaging in any transaction for the purpose of financial or pecuniary gain or profit.” (Emphasis added).

What Must be Reported

S.B. 253 requires annual public disclosure of direct and indirect greenhouse gas emissions—what’s called Scope 1, Scope 2, and Scope 3 emissions—via reports submitted to the California Air Resource Board (“CARB”).

  1. Scope 1 emissions are direct emissions from owned or controlled sources, regardless of location. This can include, but is not limited to, fuel combustion activities, such as from gas or diesel power-vehicles or equipment owned by the reporting entity.
  2. Scope 2 emissions are indirect emissions from the generation of purchased or acquired electricity, steam, heat, or cooling, regardless of location.
  3. Scope 3 emissions are all other indirect upstream and downstream emissions from a company’s supply chain (aka, value chain emissions). Examples of Scope 3 emissions sources may include: production of goods the entity purchases and uses; end-use of goods the entity sells; the entity’s operational waste processed at different facility; business travel and employee commutes in vehicles not owned by the reporting entity; and investments and financed-emissions (emissions generated by a borrower of a bank). Because Scope 3 emissions are indirect, one entity’s Scope 1 emissions are in inherently another entity’s Scope 3 emissions.

The measuring and reporting of GHG emissions under S.B. 253 must be made in accordance with the standards and guidance of the Greenhouse Gas Protocol—a non-governmental organization that develops comprehensive global standardized frameworks to guide the voluntary measuring and reporting of GHG emissions, which standards and guidance were developed in partnership with the World Resources Institute (WRI) and World Business Council for Sustainable Development (WBCSD), and are widely utilized and referenced by corporations, non-governmental organizations, and government agencies alike, including by the U.S. Environmental Protection Agency[1] and the U.S. Securities Exchange Commission (SEC).[2] S.B. 253 specifically references the Greenhouse Gas Protocol Corporate Accounting and Reporting Standard, the Greenhouse Gas Protocol Corporate Value Chain (Scope 3) Accounting and Reporting Standard, and guidance for scope 3 emissions calculations that detail acceptable use of both primary and secondary data sources, including the use of industry average data, proxy data, and other generic data in its scope 3 emissions calculations. The state may choose different standards or guidance after 2033.

As a part of this reporting process, companies must also receive an “assurance engagement”—an audit of their emissions disclosures from an independent third-party and attestation as to accuracy. The statute requires assurance engagements for Scope 1 and 2 emissions at increasing certainty levels over time, and provides the California Air Resources Board with discretion to phase-in requirements for assurance engagements for Scope 3 emissions after evaluation of trends in third-party assurance requirements for Scope 3 emissions. The third-party assurance provider must have “significant experience in measuring, analyzing, reporting, or attesting to the emission of greenhouse gasses and sufficient competence and capabilities necessary to perform engagements in accordance with professional standards and applicable legal and regulatory requirements,” and these qualification requirements may be updated by CARB as necessary.

Reports will be submitted to CARB electronically via a to-be-created digital platform, which will then make the reports publicly available.

When Are Reports Due

Annual reporting requirements begin in 2026 for Scope 1 and 2 emissions, and in 2027 for Scope 3 emissions. Assurance engagements must be performed at a “limited assurance level” beginning in 2026, and at a “reasonable assurance level” beginning in 2030.

Fees and Penalties

Companies subject to S.B. 253 will need to pay an annual fee to be deposited into a Climate Accountability and Emissions Disclosure Fund, which is to be used to implement the law. The exact fee amount will be set by CARB and may be adjusted based on the Consumer Price Index.

A company that fails to comply with this law may be subject to civil penalties up to $500,000 per year, pursuant to regulations to be promulgated and enforced by CARB.

Regulations to be Promulgated

S.B. 253 is not self-executing— it requires CARB to promulgate regulations to iron out the details, consistent with the above-discussed framework, by January 1, 2025, as well as other regulations the agency deems “necessary and appropriate” to implement the bill.

Climate-Related Financial Risks Reporting (S.B. 261)

Who Must Report

The applicability of S.B. 261, the Climate-Related Financial Risk Act, is similar to that of S.B. 253, but S.B. 261 sets the annual revenue threshold at $500 million instead of $1 billion, and S.B. 261 exempts entities “in the business of insurance.” Thus, S.B. 261 applies to any non-insurance company that has an annual revenue of at least $500 million, regardless of where the company is headquartered or formed and regardless of whether it is public or private, so long as the company does any amount of businesses in California.

What Must be Reported

S.B. 261 requires applicable companies to disclose, via publication on their own websites, their climate-related financial risks and the measures they are taking to reduce or adapt to such risks.

The term “climate-related financial risk” is defined as any “material risk of harm to immediate and long-term financial outcomes due to physical and transitional risks, including, but not limited to, risks to corporate operations, provision of goods and services, supply chains, employee health and safety, capital and financial investments, institutional investments, financial standing of loan recipients and borrowers, shareholder value, consumer demand, and financial markets and economic health.”

These risks must be reported in accordance with the Final Report of Recommendations (and any successor report) of the Task Force on Climate-related Financial Disclosures (TCFD), an international non-governmental organization that is currently chaired by Michael Bloomberg and was created by the Financial Stability Board, another international non-governmental organization. Alternatively, the report may be prepared in accordance with a framework that is “equivalent” to that of the TCFD, such as the International Financial Reporting Standards Sustainability Disclosure Standards or a comparable framework issued by another governmental entity such as the SEC. Reports may be consolidated at the parent company level; thus, subsidiaries do not have to submit individual reports.

When Are Reports Due

Disclosures under S.B. 261 must be made by January 1, 2026, and every two years thereafter, on the company’s own website.

Fees and Penalties

Reporting companies will be required to pay an annual fee to cover the costs of implementing the law, in an amount to be set by CARB. The fees will be deposited into a new Climate-Related Financial Risk Disclosure Fund, to be used by CARB to implement the bill.

A company that fails to comply with this law may be subject to administrative penalties up to $50,000 per year, pursuant to regulations to be promulgated and enforced by CARB.

Regulations to be Promulgated

Unlike S.B. 253, S.B. 261 is self-executing in that it does not require CARB to first promulgate regulations for the reporting framework. The only regulations CARB must promulgate pursuant to S.B. 261 are those addressing fees and penalties.

How California’s New Laws Differ from the SEC’s Proposed Rules and EU Rules

In April 2022, the U.S. Securities and Exchange Commission (SEC) proposed a rule that would require the reporting of GHG emissions and climate-related financial risks, largely consistent with the GHG Protocol and TCFD guidance, respectively. The SEC’s yet-to-be-finalized proposed rule is similar to California’s two new laws, with three main differences: (1) the SEC’s proposed rules apply only to publicly traded companies; (2) the SEC’s proposed rules have no annual revenue threshold for determining which companies must report; (3) the SEC’s proposed rules, should they be approved, would apply sooner (in 2025); and (4) the SEC’s proposed rules include some safe harbor provisions related to Scope 3 emissions and only require reporting if a company has set GHG goals or targets which include Scope 3 emissions, or have otherwise determined scope 3 emissions are material.

Likewise, the EU has imposed GHG and climate risk reporting standards. However, the EU rules include a lower revenue threshold for determining whether an EU company must comply.

Risks and Recommendations

            California’s two new climate and emissions disclosure laws create several unknowns in terms of compliance requirements and subsequent risks.

  • The scope of whom the laws apply to—whomever “does business in California” and whose annual revenue exceeds the set thresholds—is likely to be extremely broad, but is yet undefined.
  • Because CARB will be promulgating regulations for S.B. 253 by 2025, and the first reporting deadline will be 2026, the preparation time for companies to get into compliance will be severely limited.
  • The fact that the laws rely so heavily on the guidance and “standards” set by non-governmental organizations creates unknowns in terms of how companies can participate in the standard-setting process. In particular, because S.B. 261 does not require CARB to promulgate substantive regulations for climate-related financial risks and points solely to the TCFD or “equivalent” standards, the requirements for reporting entities may be subject to change at the whims of a non-governmental organization.
  • It is yet unclear whether there will be sufficient availability of qualified, third-party entities to timely perform the “assurance” reports required by S.B. 253, particularly given how many organizations may be subject to this reporting law.
  • The requirements in S.B. 253 to report Scope 3 emissions creates both uncertainty and is likely to require a large effort, given that a company’s Scope 3 emissions are the Scope 1 emissions of another company that may not be subject to these reporting requirements and, therefore, the availability or accuracy of such data is uncertain.
  • Although S.B. 261 defines climate-related financial risks, the breadth of the definition and discretion in its interpretation creates uncertainty and compliance risks.
  • While both laws aim to minimize duplication of efforts with similar reporting requirements by other laws or other government entities, companies may nevertheless be subject to overlapping, but slightly different requirements by different entities.
  • How the information in both of these reports may interact with other laws, such as Federal Trade Commission truth in advertising regulations, is not yet clear.
  • How the information from both of these reports may be used in future laws or regulations is unknown, but it is reasonable to expect that they may influence the creation of new laws that will require more substantive action to address emissions and climate change, rather than simply reporting information.
  • Even if a company is not directly subject to these new California laws, it may get asked by its clients or customers that are directly subject to the laws for information to help the regulated entity submit its own report. Therefore, the potential reach of these laws is much broader than just the directly regulated entities.

One thing is clear, S.B. 253 and S.B. 261 will both require significant efforts by companies to gather the appropriate data, conduct the appropriate analysis, and create compliant reports, and the first 2026 deadlines for both laws is likely to sneak up fast. Accordingly, clients that do any amount of business in California and have more than $500 million in gross annual revenue—as well as smaller entities that supply or purchase from those regulated entities— should take note and start preparing now with attorneys and technical consultants.


[1] See, e.g., GHG Inventory and Process Guidance, U.S. Envtl Prot. Agency (last updated Sept. 29, 2021), https://www.epa.gov/climateleadership/ghg-inventory-development-process-and-guidance

[2] The SEC’s proposed GHG emissions disclosure rule utilizes many of the concepts of the GHG Protocol. See The Enhancement and Standardization of Climate-Related Disclosures for Investors, Proposed Rule, 87 Fed. Reg. 21334, 21343 (Apr. 11, 2022), https://www.federalregister.gov/documents/2022/04/11/2022-06342/the-enhancement-and-standardization-of-climate-related-disclosures-for-investors. 

Firm Highlights

Insights

Energy Law: Month in Review - September 2026

Welcome to Dorsey’s Energy Law: Month in Review. We provide this update to our clients to identify significant developments in the previous month. Please reach out to any of the authors, listed above, to discuss these issues. Regulatory Developments Massachusetts Ratchets Up State and Local Regulation of AI Data Centers In early September, Governor Maura Healey of Massachusetts signed an executive order requiring that artificial intelligence data centers secure the approval of local communities as a precondition to proceeding with a given project. According to the terms of the order, data center developers will need to secure a “community benefits agreement” as a precondition to receiving permits from numerous state agencies, including the Department of Environmental Protection, the Energy Facilities Siting Board, and the Massachusetts Environmental Policy Act Office. Beyond requiring community benefits agreements, the order also mandates that developers mitigate utility costs to consumers, prohibits the use of nondisclosure agreements, and requires various state agencies to develop measures to limit data center impacts on the environment. North Carolina Regulators Decline Approval of Duke Energy Gas Turbine On September 18, 2026, North Carolina Utilities Commission (NCUC) denied Duke Energy’s application for a certificate of public convenience and necessity required to construct a gas-fueled combustion turbine at its Smith Energy Complex in North Carolina. The NCUC objected strongly to the $584 million price tag and noted that Duke appeared to be constructing the facility “based on anticipated data center customer additions.” The NCUC rejected that anticipated growth as “insufficiently reliable for the Commission to act at this point.” In rejecting Duke’s application, the NCUC also noted that Duke had signed the White House Ratepayer Protection Pledge, in which it represented that it would not shift data center costs to consumers. The NCUC observed that the record did not demonstrate how Duke “intends to adhere to its commitments under the Ratepayer Protection Pledge with regard to the Proposed Facility.” Notably, commission staff had actually supported the construction of the turbine, citing concerns about Duke’s reserve margins. The NCUC noted that it “understands the Public Staff’s expressed concerns,” but those concerns were outweighed by the NCUC’s reservations, including questions of demand. Department of Energy Approves Funds for Grid Improvement The U.S. Department of Energy (DOE) recently announced that it would fund 31 grid-improvement projects in 26 states. The funding initiative is part of the DOE’s “SPARK” initiative. The funding will include $1.9 billion in federal funding from DOE and $3.35 billion in recipient cost-sharing funding. The funds will go to projects designed to improve grid reliability and lower electricity costs. Recipients plan to reconductor over 1,500 miles of transmission lines and will deploy grid-enhancing technologies across approximately 21,000 miles. DOE stated that this initiative will make available over 23 additional gigawatts of electricity. Texas Moderates Rules Governing Data Center Interconnection The Texas Public Utility Commission adopted new regulations governing large-load interconnections. The rules impose a flat study fee of $100,000 for all proposed interconnections, which departs from the initial proposal to impose study fees using a tiered system based on project size. Additionally, the final rule eliminates the PUC’s previous proposal to impose a non-refundable interconnection fee of $50,000 per MW of contracted peak demand. The final rule also moderates the initially proposed regulations governing Electric Reliability Council of Texas (ERCOT) notifications for large-load customers’ non-utilized capacity. The proposed rules would have required notifying ERCOT within 30 days of missing a scheduled energization milestone by six months. The final rules, however, do not require informing ERCOT unless a scheduled energization milestone is missed by 24 months. FERC Denies TransAlta 202(c) Cost-Recovery Plan The Federal Energy Regulatory Commission (FERC) recently rejected TransAlta’s plan to recover $19.9 million in expenses stemming from a DOE order in which DOE prohibited TransAlta from retiring its coal-powered Centralia power plant. TransAlta had previously intended to retire the facility at the end of 2025. TransAlta’s cost recovery plan proposed spending an additional $23 million on repairs to continue operating the unit. FERC’s main objection had to do with geographic scope. TransAlta’s recovery plan called for recovering costs from California Independent System Operator (CAISO) and the Southwest Power Pool (SPP), but the DOE’s order requiring operation of the plant was designed to ensure reliability in the Northwest assessment area (Montana, Oregon, Washington, and parts of northern California and northern Idaho). Accordingly, FERC was unwilling to allow cost recovery from CAISO and SPP when the order that precipitated the additional costs only related to the Northwest assessment area. FERC informed TransAlta that it would only approve cost recovery from load-serving entities in the Northwest assessment area. FERC’s decision comes amid a rush of DOE emergency orders requiring the continued operation of coal-fired generating units. Litigation Appeals Court Upholds Washington Hydropower Plant With Caveats In a September 21, 2026, opinion, the Washington Court of Appeals largely upheld a Clean Water Act water quality certification by the Washington Department of Ecology for the Goldendale Energy Storage Project, a proposed pumped-water storage hydropower system adjacent to, but off-stream from, the Columbia River. A nonprofit (Columbia Riverkeeper) and the Confederated Tribes and Bands of the Yakama Nation appealed the certification, contending that it failed to impose necessary conditions and monitoring requirements to protect the water quality of the Columbia River. Most saliently, the plaintiffs argued that the project had the potential to leak 100 acre-feet of water per year into tributaries of the Columbia River. The Court of Appeals broadly rejected plaintiffs’ challenge to the state’s conclusion that “the project was designed not to leak.” That said, the Court of Appeals did reverse on one narrow issue. Specifically, the court determined that the state’s conclusion that “leakage from the project’s tunnels would be monitored and reported” was not supported by the evidence because the certification “does not explicitly require monitoring and reporting to determine whether there is any leakage.” Accordingly, the court remanded the matter to the state to impose monitoring and reporting requirements but otherwise affirmed the certification. Legislative Developments California Legislates Restrictions on Data Center Energy Use and Grid Costs On September 21, 2026, California Governor Gavin Newsom signed seven bills broadly regulating data centers in the state. SB 1168 directed the California Public Utilities Commission to assess the energy used by data centers. It also requires the PUC to pass costs of transmission and distribution upgrades and load increases on to data centers, rather than customers. SB 886 and SB 887 compel data centers to pay for infrastructure upgrade and generation costs, and wildfire mitigation costs, in addition to imposing environmental review. The statutes additionally increase local oversight of data centers. AB 1577 imposes a monthly reporting requirement that requires data centers to supply energy consumption and efficiency data to the California Energy Commission. AB 2383 contains incentives for data centers to use onsite clean energy generation. Finally, AB 2469 and AB 2619 require data center developments to assess water supply and develop a water scarcity plan. The statutes also mandate statewide water reporting as a precondition to obtaining and renewing business licenses.

Insights

The Supreme Court Update - October 8, 2026

On September 29, 2026, the Supreme Court granted certiorari in one case: Department of Homeland Security v. D.V.D., No. 26-426: This case concerns the Trump Administration’s “third-country removal” procedures, where immigrants are deported to countries not listed in the removal orders. In granting certiorari, the Court granted the Government’s application to stay a lower court decision halting the practice, which will allow third-country removals to continue pending resolution of the case. The issues presented are: (1) Whether the district court had jurisdiction over respondents’ claims; (2) whether the district court had authority to enter class-wide declaratory relief and APA vacatur under 8 U.S.C. § 1252(f)(1); (3) whether the Government’s guidance on third-country removals is unlawful under 8 U.S.C. § 1231(b), the due process clause, or FARRA/CAT and its implementing regulations; and (4) such other questions that the Government determines are appropriate for the proper disposition of the case. On October 1, 2026, the Court granted certiorari in three additional cases: Rhoney v. Barbosa da Cunha, No. 26-104: Immigration officials detained Ricardo Aparecido Barbosa da Cunha—a Brazilian citizen who had lived in the United States for approximately twenty years after entering without inspection—and denied him a bond hearing under 8 U.S.C. § 1225(b)(2)(A). The Second Circuit held that his detention was instead governed by § 1226(a), which permits release on bond, because § 1225(b)(2)(A)’s mandatory-detention requirement applies only to noncitizens apprehended while entering the country or shortly thereafter. The question presented is: Whether 8 U.S.C. § 1225(b)(2)(A) mandates the detention pending removal proceedings of aliens who, like Barbosa da Cunha, are present in the United States without having been admitted. Missionaries of St. John the Baptist, Inc. v. Frederic, No. 25-113: A Catholic religious organization sought to build a shrine to the Virgin Mary on land the organization owned adjacent to its church in Park Hills, Kentucky. Local zoning restrictions prohibited the proposed construction. The question presented is: Whether a land-use regulation that prohibits a religious institution from building a religious structure on its own property constitutes a “substantial burden” on religious exercise under the Substantial Burden Provision of the Religious Land Use and Institutionalized Persons Act, 42 U.S.C. § 2000cc(a). Marschner v. Marschner, No. 25-1349: Under the Uniformed Services Former Spouses’ Protection Act (“USFSPA”), a veteran’s longevity-based retirement pay can be divided in a divorce, but retirement pay based on disability and retirement pay that was waived to receive disability pay are indivisible. The question presented is: Does the USFSPA require state courts to refuse enforcement of indemnification provisions in a divorce settlement agreement?

Insights

SEC Proposes Expansion of Investment Adviser Performance-Based Compensation Rule

On September 30, 2026, the Securities and Exchange Commission (the “SEC”) proposed amendments to Rule 205-3 under the Investment Advisers Act of 1940, as amended (the “Advisers Act”), which provides an exemption from the general prohibition under Section 205(a)(1) of the Advisers Act on registered investment advisers receiving performance-based compensation (the “Proposal”) so long as performance-based compensation is limited to “qualified clients”.1 Most notably for private fund sponsors, the Proposal would expand the definition of “qualified client” to include any investors that satisfy the “accredited investor” definition under Regulation D. The Proposal may also have implications for private fund managers that rely on exemptions from investment adviser registration under state law because certain state-level investment adviser registration exemptions incorporate or otherwise reference the federal qualified client definition. Expansion of the Qualified Client Definition Under the current Rule 205-3, an investor generally may qualify as a qualified client if, among other alternatives, the investor has at least $1.4 million under management with the adviser or has a net worth exceeding $2.7 million. These thresholds are higher than the financial thresholds applicable to many accredited investors under Regulation D. As a result, an investor may currently qualify as an accredited investor for purposes of investing in a private offering without qualifying as a qualified client for purposes of paying performance-based compensation. The Proposal would expand the qualified client definition to include any natural person or legal entity investor that satisfies the accredited investor definition under Regulation D. The Proposal would also remove the assets under management and net worth thresholds under the current Rule 205-3 qualified client test. For private funds relying on Section 3(c)(1) of the Investment Company Act of 1940, this change could reduce the need to apply a separate qualified client standard to investors that already qualify as accredited investors. Dorsey Observations and Next Steps If adopted as proposed, the expanded qualified client definition could be particularly significant for private fund managers. Most private fund offerings are already limited to accredited investors under Regulation D. However, the Proposal could expand the pool of prospective investors available to emerging private fund managers while reducing the regulatory burden associated with complying with Rule 205-3. The Proposal could also benefit advisers operating below the SEC registration threshold that rely on a state private fund adviser exemption. A number of states have adopted exemptions modeled on the North American Securities Administrators Association (“NASAA”) private fund adviser exemption, which may condition relief for advisers to certain funds relying on Section 3(c)(1) on each beneficial owner satisfying the federal qualified client definition. However, state requirements vary, and any effect of the Proposal would depend on the text of the applicable state exemption and how it incorporates Rule 205-3. Many emerging private fund managers may have a larger network of accredited investor relationships than qualified client relationships during the early stages of their investment advisory business. Currently, under Rule 205-3, private fund managers may receive performance-based compensation from investors who do not satisfy the qualified client definition if those investors were admitted to their private funds prior to registration with the SEC. Following registration with the SEC, however, managers may continue to permit investors that are not qualified clients to invest in future private funds but may not receive performance-based compensation from those investors with respect to such investments. In addition, because the net worth and assets under management thresholds for qualified client status are adjusted for inflation every five years, the pool of qualified client investors may diminish over time as previously eligible investors no longer satisfy the applicable thresholds. The Proposal could provide the dual benefit of greater flexibility for private fund managers to establish and maintain relationships with accredited investors as their businesses scale and they become registered with the SEC, and greater flexibility for certain accredited investors to participate in investment strategies that historically have been restricted to much larger institutional investors. Unless and until the Proposal is adopted, investment advisers should continue to comply with the existing qualified client requirements. If the Proposal is adopted, private fund sponsors should consider whether corresponding changes are appropriate for their subscription documents, investor questionnaires, and other offering materials. Advisers that are state-registered or rely on a state-level exemption should also consult the laws and regulations of each relevant jurisdiction before changing investor eligibility standards or performance-based compensation practices, because adoption of the federal amendments may not automatically modify state requirements. Comments on the Proposal will be due 60 days after publication in the Federal Register. 1 Investment Adviser Performance-Based Compensation Modernization, Investment Advisers Act Release No. IA-7022 (Sept. 30, 2026), available at https://www.sec.gov/rules-regulations/2026/09/s7-2026-28#33-11443proposed.

Insights

EPA Limits Title V Re-Litigation of NSR Permits

Overview On September 25, 2026, the U.S. Environmental Protection Agency (“EPA”) published a final rule that significantly limits the ability of third parties to use the Clean Air Act (“CAA”) Title V permitting process to revisit New Source Review (“NSR”) permitting decisions years after those decisions were made. The rule establishes that NSR permitting determinations generally must be challenged during the original permitting proceeding, thereby providing regulated sources with greater permitting certainty and finality for major capital projects. Published in the Federal Register titled Clarifying the Scope of “Applicable Requirements” Under State Operating Permit Programs and the Federal Operating Permit Program (Docket ID No. EPA-HQ-OAR-2023-0401), the rule amends 40 C.F.R. Parts 70 and 71 to codify EPA’s interpretation regarding when requirements established under other CAA programs may be reviewed, modified, or implemented through the Title V operating permit program. The rule becomes effective 30 days after publication. The rule addresses two principal issues: (1) the relationship between NSR preconstruction permitting and Title V operating permits, and (2) the treatment of the General Duty Clause under CAA section 112(r)(1). Most significantly, the rule provides greater certainty for sources navigating the NSR permitting process. EPA’s amendments are intended to ensure that NSR permitting decisions made through an approved public process are generally not revisited later through Title V permit proceedings. The rule responds to a circuit split between the U.S. Courts of Appeals for the Fifth and Tenth Circuits. In Environmental Integrity Project v. EPA, 969 F.3d 529 (5th Cir. 2020), the Fifth Circuit upheld EPA’s interpretation, concluding that it was consistent with the text, structure, and purpose of Title V. In contrast, the Tenth Circuit reached the opposite conclusion in Sierra Club v. EPA, 964 F.3d 882 (10th Cir. 2020), finding that the then-existing regulatory definition of “applicable requirement” did not support EPA’s position. By amending the regulatory language on which the Tenth Circuit relied and codifying the interpretation approved by the Fifth Circuit, EPA has established a nationwide framework governing the interaction between NSR and Title V. NSR and Title V: EPA Establishes a Uniform Nationwide Framework At the core of the rule is EPA’s effort to define the respective roles of NSR and Title V. The rule codifies the approach EPA has applied since 2017: once a source obtains an NSR permit under an EPA-approved permitting program, and that permit was issued following public notice with an opportunity for comment and judicial review, the permit establishes the NSR-related “applicable requirements” of the State Implementation Plan (“SIP”) or Federal Implementation Plan (“FIP”) for Title V purposes. Under this framework, Title V is not a vehicle for re-examining underlying NSR permitting decisions. EPA does not intend to use the Title V process to revisit applicability determinations, emissions calculations, control technology determinations, permit conditions, or other issues resolved through the NSR permitting process. This principle applies regardless of the stage of the Title V proceeding; whether the NSR permit was issued pursuant to a SIP or FIP; the type of NSR issue involved; or whether the NSR permit is incorporated into Title V sequentially or concurrently. Limited Exceptions EPA recognizes several circumstances in which NSR issues may still be reviewed through the Title V program: No NSR permit was issued at all; The permit was issued without public notice and an opportunity for comment and judicial review; or The issue involves substantive overlap between Title V and NSR requirements, such as the adequacy of monitoring provisions. As a result, the rule does not insulate unpermitted projects or foreclose review of matters that independently arise under Title V. Key Regulatory Amendments The rule revises the definition of “applicable requirement” in 40 C.F.R. §§ 70.2 and 71.2. Paragraph (1): Where an NSR permit is issued with public notice and an opportunity for comment and judicial review, the permit establishes and defines the applicable SIP or FIP requirements for Title V purposes. Paragraph (2): All NSR permit terms, including terms contained in minor NSR permits, constitute applicable requirements that must be incorporated into Title V permits. Paragraph (4): CAA section 112(r)(1) (the General Duty Clause) is expressly excluded from the definition of “applicable requirement,” while section 112(r)(7) Risk Management Program requirements remain included. EPA also amended 40 C.F.R. §§ 70.8 and 70.12 to clarify that alleged defects in requirements established outside the Title V process generally do not provide a basis for EPA objection to a Title V permit or for a Title V citizen petition. General Duty Clause Exclusion The rule also codifies EPA’s longstanding position that the General Duty Clause in CAA section 112(r)(1) is not an “applicable requirement” for Title V purposes. EPA points to several considerations supporting that conclusion, including the distinction between the General Duty Clause and Title V permit terms, the provision’s origins in the Occupational Safety and Health Act’s general duty clause, and the different enforcement structures applicable to the General Duty Clause and Title V permit requirements. Importantly, excluding section 112(r)(1) from the definition of “applicable requirement” does not eliminate EPA’s authority to enforce the General Duty Clause independently of the Title V program. The final rule instead clarifies that the General Duty Clause need not—and should not—be incorporated into Title V permits as an applicable requirement. Practical Implications for Regulated Sources Greater Finality for NSR Permits  For projects requiring PSD, nonattainment NSR, or minor NSR permits, the permitting process becomes the primary forum for resolving disputes regarding applicability determinations, emissions calculations, control technology requirements, offsets, and permit conditions. Once an NSR permit is issued through a qualifying public process, regulated sources should face substantially reduced risk that those same issues will be challenged years later through Title V permit proceedings. Reduced Risk of Collateral Permit Challenges Stakeholders have sometimes sought to use Title V permit issuance, renewal, revision, or citizen-petition proceedings to challenge underlying NSR determinations. The final rule makes clear that Title V is not the appropriate vehicle for challenging whether an applicable requirement was correctly established in the first instance. This should reduce the risk of permit delays and uncertainty associated with collateral challenges to previously issued NSR permits. The rule does not, however, eliminate all Title V challenges relating to an NSR permit. Challenges concerning the Title V permit itself—including whether it appropriately incorporates applicable requirements or contains adequate compliance provisions—remain possible. Increased Importance of the Initial NSR Proceeding Because Title V generally will not provide a second opportunity to challenge the substantive validity of an NSR determination, the administrative record developed during the NSR process becomes increasingly important. Permit applicants should ensure that applicability analyses, emissions calculations, control technology evaluations, modeling demonstrations, and supporting technical documentation are thoroughly developed during the original permitting proceeding. For significant projects, applicants may therefore have an additional incentive to identify and resolve potential permitting issues before the NSR permit is issued rather than assuming that unresolved issues can be addressed during a subsequent Title V proceeding. Potential Incentive for Broader Public Participation EPA also notes that permitting authorities may choose to provide public notice and an opportunity for comment for a broader range of NSR permits because permits issued through a qualifying public process receive the benefit of the finality framework established by the rule. Some permitting authorities may conclude that greater public participation at the NSR stage is preferable to uncertainty during subsequent Title V proceedings. Conclusion The final rule is principally a permitting-certainty measure. For sources that obtain NSR permits through a public process, EPA has substantially limited the ability of third parties to revisit underlying NSR determinations through the Title V program. As a result, regulated entities should benefit from greater finality regarding key permitting decisions, reduced risk of collateral permit challenges, and increased certainty when planning and implementing capital projects.