NOTICE DATE: November 17, 2025
NOTICE TYPE: M-A111725-01 Operations
SHORT DESCRIPTION: Potential Price Correction - Incorrect Generation to be Dispatched Values Used in SCED
INTENDED AUDIENCE: All Market Participants
DAYS AFFECTED: October 14, 2025
LONG DESCRIPTION: On October 14, 2025, the ERCOT control room observed an abnormal spike in the external Short Term Load Forecast (STLF), resulting in the decision to switch to an internal STLF. An Energy Management System (EMS) bug prevented this switch from properly executing, resulting in the load forecast spike being included in the calculation for Generation to be Dispatched (GTBD). This resulted in high system lambdas between 08:10pm and 08:15pm.
ERCOT identified the issue on October 23, 2025, and thus could not correct prices within the 2-business day timeframe for the impacted Operating Day (OD).
In order for ERCOT to seek approval of a price correction by the ERCOT Board of Directors (ERCOT Board), ERCOT Protocols Section 6.3(7)(b) requires that the absolute value impact to any single Counter-Party in the Real-Time Market (RTM) must meet one of the following two criteria:
- 2% and also greater than $20,000 (Protocol Section 6.3(7)(b)(i)); or
- 20% and also greater than $2,000 (Protocol Section 6.3(7)(b)(ii)).
ERCOT has determined that OD October 14, 2025 has met the criteria for seeking ERCOT Board approval for a price correction. The number of Counter-Parties meeting one of the two criteria for significance are shown in the table below.
|
Operating Day
|
No. of Counter-Parties meeting Criterion 1
|
No. of Counter-Parties meeting Criterion 2
|
|
10/14/2025
|
18
|
3
|
The table below has the maximum estimated absolute value impact to any individual Counter-Party.
| Operating Day |
Maximum Amount |
Maximum Percentage
for Criterion 1
|
Maximum Percentage
for Criterion 2
|
| 10/14/2025 |
$140,106.63 |
21.91% |
146.42% |
CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at ClientServices@ercot.com.
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