EPA's New ERC Guidance: NNSR Permits Can Now Issue Before Offsets Are Secured — Here's the Catch
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EPA's New ERC Guidance: NNSR Permits Can Now Issue Before Offsets Are Secured — Here's the Catch

EPA's July 1, 2026 guidance lets air agencies issue NNSR permits before emission reduction credits are secured. The two mandatory conditions — and the risks.

by iSi Environmental

If you’re planning a major project in a nonattainment area, EPA just changed the sequencing math on you. On July 1, 2026, EPA’s Office of Air and Radiation issued guidance clarifying that permitting authorities may issue a Nonattainment New Source Review (NNSR) preconstruction permit before the required emission reduction credits (ERCs) have been identified or secured (EPA news release, July 1, 2026). Because the NNSR permit is the legal gate to beginning construction, the practical effect is real: you can get your permit — and start building — before you own a single offset credit.

But EPA put the catch in writing, twice. The permit must contain (1) an enforceable commitment from the permittee to obtain the necessary emission reductions before commencing operation, and (2) an express prohibition on commencing operation until the required ERCs are identified, approved, and secured with appropriate permit restrictions (EPA news release, July 1, 2026). And EPA’s own framing is blunt about who carries the risk: companies that take this path “construct their facilities at their own risk.” Build the plant without locking down credits, and if the ERC market can’t deliver by startup, you own a completed facility you cannot lawfully turn on.

One more thing before the details: this is guidance, not a rule. EPA’s release states it “does not change or substitute for any law, regulation, or any other legally binding requirement.” Whether your permitting agency can actually issue a permit before offsets are secured depends on your state’s EPA-approved State Implementation Plan (SIP) — not on the guidance alone. No facility can invoke this flexibility unilaterally.

Here’s what facility engineers and capital-project teams need to know, question by question.

Can an NNSR permit be issued before emission offsets are secured?

Yes — under EPA’s July 1, 2026 guidance, a permitting authority may issue an NNSR permit before ERCs are identified or secured, provided the permit contains an enforceable commitment to obtain the reductions before commencing operation and an express prohibition on operating until the ERCs are identified, approved, and secured (EPA news release, July 1, 2026).

This reverses the practice most air agencies have followed for decades: requiring credits to be secured and federally enforceable before the construction permit issued. For projects with multi-year build schedules, that front-loading forced companies to buy scarce credits years before startup — or stall the permit until credits materialized. The guidance was posted to EPA’s NSR Policy and Guidance Document Index; as of this writing, the news release and the index page are the access points for the document itself.

The two mandatory conditions are not boilerplate. They become federally enforceable permit terms — which is exactly what makes the structure legally workable and what makes violating them expensive (more on that below).

What are emission reduction credits (ERCs) in air permitting?

ERCs are surplus, permanent, quantifiable, and federally enforceable emission reductions — typically from shutdowns, curtailments, or over-control at existing sources — that a new major source or major modification in a nonattainment area purchases or generates to offset its emission increases under CAA §173 (42 U.S.C. 7503) and 40 CFR 51.165(a)(3).

The logic of the offset requirement is arithmetic: a nonattainment area already exceeds a National Ambient Air Quality Standard, so any new emissions must be more than paid for by reductions elsewhere in the area. Credits are usually held in state-run banks or registries — Colorado’s Air Pollution Control Division runs one example (CDPHE ERC registry) — and supply depends entirely on whether prior reductions were banked in your area for your pollutant.

When does the Clean Air Act actually require offsets to be in hand?

By startup, not permit issuance. CAA §173(a)(1)(A) (42 U.S.C. 7503(a)(1)(A)) requires the permitting agency to determine that “by the time the source is to commence operation, sufficient offsetting emissions reductions have been obtained.” EPA’s 2026 guidance reads that timing literally — the offset obligation attaches to operation.

This is the statutory hook for the entire guidance. Congress pinned the offset determination to the moment the source “is to commence operation,” and EPA reads the §173(a)(1)(A) timing literally, while §173(a)‘s closing sentence points the other way — a tension the guidance does not resolve. Historically, agencies read the regulations differently — and, as we’ll cover below, the regulatory text still contains language that cuts the other way. That tension is why this interpretation will get tested permit by permit.

Can I start construction in a nonattainment area before my offsets are secured?

Yes, if your permitting agency issues the NNSR permit with the guidance’s two conditions — construction may begin once the permit issues, at your own economic risk (EPA news release, July 1, 2026). What you cannot do is commence operation before the ERCs are identified, approved, and secured; that prohibition must be written into the permit itself.

Read that risk allocation carefully. The old regime put the risk on the schedule: no credits, no permit, no construction. The new structure moves the risk onto your balance sheet: you can pour concrete, erect steel, and install equipment while your ERC acquisition runs in parallel — but the startup gate stays closed until the credits are secured. For a capital-project team, that means ERC acquisition needs to be managed like a critical-path procurement item with a hard gate before commissioning, not a permitting formality.

What offset ratio applies to my project?

For ozone nonattainment areas, CAA §182 sets ratios by classification: 1.1:1 marginal, 1.15:1 moderate, 1.2:1 serious, 1.3:1 severe, and 1.5:1 extreme — with the same BACT-based alternative available at BOTH the severe and extreme tiers: a SIP that requires BACT for VOC control at all existing major sources in the area may use 1.2:1 instead of 1.3:1 (severe) or 1.5:1 (extreme) (42 U.S.C. 7511a; codified identically at 40 CFR 51.165(a)(9)(ii)(D)-(E)). A 100 tpy VOC increase in a moderate area needs 115 tpy of creditable reductions. Other pollutants offset at ratios of at least 1:1 per the SIP.

The ratio compounds the market-availability problem: the tonnage you need to buy is always more than the tonnage you’ll emit. In the Denver Metro/North Front Range — classified Severe for the 2008 ozone NAAQS — a 50 tpy NOx increase means sourcing 65 tpy of creditable reductions at 1.3:1. We walked through how these offset ratios play out for facilities in a newly designated nonattainment area in our post on Detroit’s ozone nonattainment NSR permitting — the same mechanics apply anywhere NNSR is triggered.

Do offsets still have to be federally enforceable?

Yes. 40 CFR 51.165(a)(3)(ii)(E) requires that “all emission reductions claimed as offset credit shall be federally enforceable,” and reductions must be surplus, permanent, and quantifiable. The 2026 guidance changes only the timing of when credits must be secured — none of the substantive creditability tests.

That means every ERC you eventually acquire still has to survive the full screen: real, surplus (beyond what regulation already requires), permanent, quantifiable, and federally enforceable, sourced from the correct geographic area under CAA §173(c), at the correct ratio for your area’s classification. A permit-first schedule doesn’t buy you a more forgiving credit review at the back end — it just moves the review later, when you have far more capital committed.

Does the guidance change my state’s NNSR rules automatically?

No. Guidance “does not change or substitute for any law, regulation, or any other legally binding requirement” (EPA news release, July 1, 2026). If your EPA-approved SIP requires offsets before permit issuance, that requirement governs until the state revises its rule and EPA approves the SIP revision.

This is the single most important caveat for multi-state project planning. The state permitting agency — TCEQ in Texas, CDPHE in Colorado, MDNR in Missouri — decides whether the permit-first-offsets-later structure is available, and only within the bounds of its approved SIP. Texas runs active ERC markets for the Houston-Galveston-Brazoria and Dallas-Fort Worth ozone areas under 30 TAC Chapter 101 Subchapter H, with its own rules on when credits must be surrendered. As of July 7, 2026 — six days after issuance — no state agency has publicly announced adoption of the guidance’s approach. Before you re-sequence a project schedule around it, get the answer from your permitting agency in writing.

What happens if I build the plant but can’t get ERCs before startup?

You cannot lawfully commence operation — the permit’s express prohibition holds until ERCs are secured, and EPA framed this path as building “at their own risk.” Operating anyway is a permit/SIP violation with exposure of $59,114 per day administratively (capped at $472,901) or up to $124,426 per day judicially (40 CFR 19.4, 2025 penalty levels carried into 2026).

Those permit conditions are enforceable under CAA §113 — and by citizen suit under CAA §304, which means the enforcement risk isn’t limited to what EPA or your state agency chooses to pursue. The worst-case scenario is concrete: a completed, commissioned-ready plant, carrying costs accruing, and a startup date controlled by an ERC market you don’t control. That is a worse outcome than a delayed permit, and it’s the scenario your due diligence has to price before construction starts.

Why did permitting agencies historically require offsets before issuing the permit?

Agencies read 40 CFR 51.165(a)(3)(ii)(E)‘s federal-enforceability requirement, and older EPA statements — including the March 14, 2000 Region 9 Otay Mesa mobile-ERC memo — to mean credits had to be enforceable at permit issuance. For multi-year builds, this forced early ERC purchases in thin markets and delayed permits when credits weren’t yet available — the delay EPA’s 2026 guidance targets.

The historical practice wasn’t arbitrary. Securing credits up front guaranteed the offset math worked before the state committed to the permit, and it kept the enforceability question clean. The cost was schedule: in tight credit markets, a permit application could sit while the applicant hunted for tonnage. EPA’s 2026 reading trades that certainty for speed — and shifts the residual uncertainty to the permittee.

How does this relate to EPA’s “begin actual construction” proposed rule?

They are complementary streamlining actions. The May 13, 2026 proposal (91 FR 26958) would let non-emitting site work — grading, pads, utility infrastructure — proceed before an NSR permit issues; the July 1 ERC guidance lets the NNSR permit itself issue before offsets are secured. Together they compress nonattainment-area project schedules from both ends.

Run the before-and-after timeline. Under the old sequencing, a nonattainment-area project ran serially: secure ERCs → obtain permit → begin all site work → build → start up. If both actions take effect as written, the sequence parallelizes: early site work can proceed while the permit is pending (per the proposal — comments closed June 29, 2026, and it is not yet final), the permit can issue before credits are locked, and ERC acquisition runs alongside construction with a single hard gate at startup. We covered the construction-definition side in detail in our post on the EPA “begin actual construction” proposed rule. For schedule-driven projects, the two actions together are the story — but remember that one is a non-final proposal and the other is non-binding guidance.

Does this guidance apply to PSD permits in attainment areas?

No. Offsets are an NNSR requirement under CAA title I part D for nonattainment areas (42 U.S.C. 7503). PSD permits in attainment areas (CAA title I part C) require BACT and air-quality demonstrations but no emission offsets, so the ERC-timing guidance has no PSD application.

Scope matters in the other direction too: this is major-source NNSR only. Minor sources are unaffected, and applicability is pollutant-specific and threshold-driven — generally 100 tpy potential to emit for a new major source, with lower ozone-precursor thresholds by classification (50 tpy serious, 25 tpy severe, 10 tpy extreme) under 40 CFR 51.165. If your project is in an attainment county, nothing here changes your permitting path.

Are ERCs available in my area, and what do they cost?

ERC markets are area- and pollutant-specific — credits exist only where prior reductions were banked (for example, Colorado’s APCD ERC bank), and scarcity drives price. No federal price data exists; pricing is private-market. Before relying on the permit-first path, verify the local bank holds sufficient creditable tonnage for your pollutant — scarcity is the central business risk of building before securing credits.

This question deserves its own line item in project due diligence. Here is the five-question ERC-market checklist to work through before betting a build schedule on offsets you don’t own yet:

  1. Does your state SIP allow permit issuance before offsets are secured? Ask the permitting agency directly and get the answer in writing. If the approved SIP text requires ERCs at issuance, the SIP controls until it’s revised — the federal guidance cannot override it.
  2. Does the local ERC bank hold sufficient creditable tonnage for your pollutant? Check the state registry for banked credits in your nonattainment area, for your specific pollutant. Credits for NOx don’t offset VOC, and credits banked in another airshed generally don’t count (CAA §173(c); 40 CFR part 51 appendix S §IV.D).
  3. Will the banked credits survive creditability review? Surplus, permanent, quantifiable, federally enforceable — under 40 CFR 51.165(a)(3)(ii). Banked does not automatically mean creditable at the ratio and vintage you need.
  4. What does the ratio do to your required tonnage? Apply the CAA §182 multiplier for your area’s classification to your project’s emissions increase, and confirm the market can supply that gross figure — not just your nominal increase.
  5. What is your fallback if credits become unavailable or unaffordable before startup? Options to evaluate before construction: securing credits early anyway, generating internal reductions at existing units, phasing the project, or contractual options on banked credits. If the honest answer is “none,” the permit-first path is a bet, not a plan.

Three reasons not to treat this as a green light

This guidance is genuinely useful for schedule-constrained projects — and it comes with three structural warnings that belong in any briefing to your leadership.

First, the risk transfers to the facility, not away from it. EPA said so directly: companies “construct their facilities at their own risk.” The guidance is most tempting exactly where it is most dangerous — serious and severe ozone areas with thin ERC markets, where early credit purchases were hardest and where startup-date certainty is lowest.

Second, guidance is not law, and the regulatory text still cuts the other way. 40 CFR 51.165(a)(3)(ii)(E) still says offset credits “shall be federally enforceable,” and prior EPA statements like the 2000 Otay Mesa memo has been read by agencies to require enforceability at permit issuance. A non-binding memo cannot amend the CFR. More than that, CAA §173(a) itself provides that “[a]ny emission reductions required as a precondition of the issuance of a permit under paragraph (1) shall be federally enforceable before such permit may be issued” (42 U.S.C. 7503(a)). Because there was no notice-and-comment rulemaking, the interpretation carries no deference shield — expect environmental petitioners to challenge individual NNSR permits issued without secured offsets, arguing the SIP or the CFR requires enforceability at issuance. Every permit issued on the new timing carries some appeal exposure until EPA codifies the interpretation or states amend their SIPs.

Third, state SIPs may block it entirely. Where approved SIP language requires secured offsets at issuance, agencies cannot follow the guidance without a SIP revision — meaning the near-term effect in many nonattainment areas is zero. The guidance changes what’s possible in principle; your SIP determines what’s possible on your project.

What to do now

If you have a nonattainment-area project on the board, the action items are concrete: confirm your state SIP’s position with the permitting agency, run the five-question ERC-market check before finalizing the project schedule, and if the agency will structure the permit per the guidance, make sure the two mandatory conditions are drafted so the startup gate is unambiguous — because that language becomes your enforceable obligation.

iSi’s environmental compliance team supports facilities through NNSR applicability determinations, air permit strategy, and ongoing environmental compliance support — including working the state-SIP question with your permitting agency before your schedule depends on the answer. If a project in a nonattainment county is on your capital plan, our environmental compliance consulting group can help you pressure-test the sequencing before you commit.

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