NOTICE DATE: August 7, 2020
NOTICE TYPE: W-B080720-01 Operations
SHORT DESCRIPTION: Implementation of maximum Shadow Price for an irresolvable constraint in SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAY AFFECTED: August 07, 2020
LONG DESCRIPTION: On August 7, 2020, ERCOT will be implementing a modified maximum Shadow Price for a constraint that was found to be irresolvable per the criteria defined in Section 3.6.1 of the Other Binding Document (OBD), Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints. The update to the maximum Shadow Price will occur between 5:00 PM and 6:00 PM Central Prevailing Time (CPT) on August 7, 2020. The contingency/constraint pair and updated maximum Shadow Price are as follows:
| Contingency Name |
Constraint Name |
From Station/kV |
Description |
Maximum Shadow Price |
| SMV_ALT8 |
479T479_1 |
WESLACO /138 |
Loss of West Ednburg Sub (MV_WEDN4) to Alton Sub (ALTON_MV) 138kV Line overloads the 138kV line from Weslaco Switch (WESLACO) to North Alamo (N_ALAMO) |
2,000 $/MWh |
This new maximum Shadow Price will be used for all constraints in Security-Constrained Economic Dispatch (SCED) which share the same monitored element (i.e. constraint name) and direction.
ADDITIONAL INFORMATION: The ERCOT business practice document, Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch, can be found in the Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints 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 ClientServices@ercot.com.
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