NOTICE DATE: December 29, 2023
NOTICE TYPE: W-A121923-01 Operations
SHORT DESCRIPTION: Change to maximum shadow prices for constraints previously determined as irresolvable by SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAY AFFECTED: January 1 and 30, 2024
LONG DESCRIPTION: Section 3.6.2 of the Other Binding Document, Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints, requires ERCOT to review annually each constraint previously determined irresolvable by Security-Constrained Economic Dispatch (SCED) and determine (1) if the constraint has become SCED resolvable, and, if not, (2) re-determine the maximum Shadow Price for a constraint that continues to be irresolvable by SCED.
Effective January 1, 2024, the following changes to the set of constraints that are consistently irresolvable by SCED will be made:
| Contingency Name |
Constraint Name |
From Station / kV |
Description |
Current Maximum Shadow Price ($/MWh) |
Maximum Shadow Price Effective 1/1/2024 ($/MWh) |
| BASECASE |
VALIMP |
N/A |
Valley Import Basecase |
2000 |
5168.59 |
| SBE2ASH8 |
HAMILT_MAVERI1_1 |
HAMILTON/138 |
Loss of the 138 kV line from BEVO (BEVO) to ASHERTON (ASHERTON) overloads the 138 kV line from HAMILTON ROAD (HAMILTON) to MAVERICK (MAVERICK) |
2000 |
3500 |
| SBEVASH8 |
HAMILT_MAVERI1_1 |
HAMILTON/138 |
Loss of the 138 kV line from ASHERTON (ASHERTON) to MCLEAN SOLAR (MCLNSLR) overloads the 138 kV line from HAMILTON ROAD (HAMILTON) to MAVERICK (MAVERICK) |
2000 |
3500 |
| SDIMBEV8 |
HAMILT_MAVERI1_1 |
HAMILTON/138 |
Loss of the 138kV line from Dimmit (DIMMIT) to Bevo (BEVO) overloads the 138 kV line from Hamilton Road (HAMILTON) to Maverick (MAVERICK) |
2000 |
3500 |
Additionally, effective January 30, 2024, the following constraints will no longer be considered irresolvable by SCED:
|
Contingency Name |
Constraint Name |
From Station / kV |
Description |
| SSKYSB28 |
15080__Z |
CONSW/138 |
Loss of the 138 kV line from Sky West (SKYWES) to Sprayberry Switch (SBYSW) overloads the 138 kV line from Consavvy Switch (CONSW) to Cottonfield Sub (CTFLD) |
Section 3.6 of the document requires a 30-day notice before the shadow price caps for SCED- resolvable constraints are reset to their default values. The identified constraints will have their shadow price caps reset to their default shadow price cap values on January 30, 2024.
ADDITIONAL INFORMATION: The ERCOT Other Binding Document , Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints, can be found under "Key Documents" on the Real-Time Market webpage, and under the Other Binding Documents List, both of which are on the ERCOT website.
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 [log in to unmask].
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