US KKKKa NOx concentration limit for the specified large, high-utilization natural-gas turbine subcategory
5 ppmvd at 15% O₂observed
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| Scope | Affected new natural-gas turbines >850 MMBtu/h and >45% heat-input utilization: concentration option, four-operating-hour rolling average. Check special operating categories. Chapter 6.8’s emissions table gives the corrected 60.4420a utilization/exclusions and heat-input/output alternatives; this is not a RICE or all-turbine limit. |
| As of | 2026-07-16 |
| Source | EPA final rule, Federal Register 2026-01-15; technical correction 2026-07-16 effective 2026-08-17. · Corrected 60.4420a utilization definition (PDF p. 8); Table 1 and notes 1–2 (PDF pp. 8–9); temporary category read with 60.4331a. |
| Review | checking…review by 2027-03-05 · standard cadence |
| Recorded changes | last 2026-09-16 · 2 revisions tracked |
| Claim id | nox-from-a-high-utilization-natural-gas-turbine |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.