NOTICE DATE: December 31, 2024
NOTICE TYPE: W-A123124-01 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, 2025
LONG DESCRIPTION: Section 3.6.2 of Protocols Section 22, Attachment P, Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints ("Shadow Price Methodology"), 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, 2025, the following maximum shadow price change for the set of constraints that are consistently irresolvable by SCED will be made:
|
Contingency Name
|
Constraint Name
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From Station / kV
|
Description
|
Current Maximum Shadow Price ($/MWh)
|
Maximum Shadow Price Effective 1/1/2025 ($/MWh)
|
|
SMCEABS8
|
CAPELL_MERK1_1
|
CAPELLA/69
|
Loss of the 138 kV line from MOORE to MCELMURRAY LIN 1 overloading the 69 kV line from MERK to CAPELLA.
|
2000
|
2800
|
Additionally, effective January 30, 2025, the following constraints will no longer be considered irresolvable by SCED:
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Contingency Name
|
Constraint Name
|
From Station / kV
|
Description
|
|
SBE2ASH8
|
HAMILT_MAVERI1_1
|
HAMILTON/138
|
Loss of the 138 kV line from BEVO to ASHERTON overloads the 138 kV line from HAMILTON ROAD to MAVERICK
|
|
SBEVASH8
|
HAMILT_MAVERI1_1
|
HAMILTON/138
|
Loss of the ASHERTON to MCLEAN SOLAR 138kV line overloads the 138kV line from HAMILTON to MAVERICK
|
|
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)
|
Section 3.6 of the Shadow Price Methodology 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, 2025.
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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