ERCOT (NOG 2.6.2.1) ride-through requirements
Frequency ride-through for the United States. Every breakpoint below is read from the code itself, and carries the clause it came from — so you can check it, not just cite it.
What is the frequency ride-through envelope for ERCOT (NOG 2.6.2.1)?
The plant must ride through between the upper and lower bands. The upper (over-frequency) band holds 61.8 Hz from t = 0 to 299 s; then 61.6 Hz from 299 s to 9 min; then 61.2 Hz from 9 min onward — the last band the envelope defines, with no stated end time. The lower (under-frequency) band holds 57 Hz from t = 0 to 299 s; then 58.4 Hz from 299 s to 9 min; then 58.8 Hz from 9 min onward — the last band the envelope defines, with no stated end time.
The last band has no stated end time. The clause below states a continuous region — highlighted; check which band it covers, because it is not always the last one.
Applies to Transmission-connected inverter-based resources in ERCOT
Upper limit
| From | To | Frequency | Between the points |
|---|---|---|---|
| 0 | 299 s | 61.8 Hz | Held flat |
| 299 s | 9 min | 61.6 Hz | Held flat |
| 9 min | no stated end | 61.2 Hz | Held flat |
Lower limit
| From | To | Frequency | Between the points |
|---|---|---|---|
| 0 | 299 s | 57 Hz | Held flat |
| 299 s | 9 min | 58.4 Hz | Held flat |
| 9 min | no stated end | 58.8 Hz | Held flat |
The clause this came from
ERCOT Nodal Operating Guides Section 2.6.2.1 'Frequency Ride-Through Requirements for Transmission-Connected Inverter-Based Resources (IBRs), Type 1 Wind-powered Generation Resources (WGRs) and Type 2 WGRs', paragraph (1) table (December 5, 2025 text, p. 32; carried in the February 1, 2026 Nodal Operating Guide): f > 61.8 Hz — may ride-through or trip; 61.6 < f ≤ 61.8 — 299 s; 61.2 < f ≤ 61.6 — 540 s; 58.8 ≤ f ≤ 61.2 — continuous; 58.4 ≤ f < 58.8 — 540 s; 57.0 ≤ f < 58.4 — 299 s; f < 57.0 — may ride-through or trip.
Who does ERCOT (NOG 2.6.2.1) bind, and since when?
Transmission-connected inverter-based resources in ERCOT. No date of effect is published here — grid codes are reissued, so check the current issue before relying on it.
These figures are a reading aid, not legal advice. Grid codes are reissued: verify against the current edition before you design to them.
Digitised operating parameters beyond ride-through — droop, reactive capability, operating ranges — are published for 36 of the 66 codes in this atlas, not yet for ERCOT (NOG 2.6.2.1). That is a gap on this site, not a statement that ERCOT (NOG 2.6.2.1) sets none — the atlas hub marks the codes that carry them.
Curve data last checked against the code on — 66 standards, 130 envelopes, published by bess.engineer under CC BY 4.0.
Questions this page answers about ERCOT (NOG 2.6.2.1)
- Does ERCOT (NOG 2.6.2.1) require ride-through, or only that the plant does not trip?
- Ride-through, for the envelopes on this page — that is what each of them is. It is not everything ERCOT (NOG 2.6.2.1) contains: the clauses quoted under the charts also address when the plant may or must trip. The requirement sentence under each chart says which side of the curve is the compliant one.
- Are the numbers on this page taken from ERCOT (NOG 2.6.2.1) itself?
- Yes. Every breakpoint is read from the code, and each envelope carries the clause it came from, quoted in full under its chart — so you can check the figure against the standard rather than cite it from this page.
- Which events are charted for ERCOT (NOG 2.6.2.1)?
- ERCOT (NOG 2.6.2.1) is charted here with 1 envelope — frequency ride-through (FRT). No low-voltage or high-voltage envelope is charted here — check ERCOT (NOG 2.6.2.1) itself before concluding it sets none.
Ride-through, in context.
An envelope is a compliance boundary; understanding why it exists is a different question. The ride-through and grid-forming entries cover the engineering, and the Engineering Foundations course builds it from the physics up.
Also for the United States: NERC PRC-029-1 (IBR), NERC PRC-029-1 (Table 1: AC-connected wind IBR), Transient overvoltage (IEEE 2800 TOV), California Rule 21, ERCOT (NOG 2.9.1.2 legacy), ERCOT (NOG 2.9.1), and 5 more