NOTICE DATE: February 4, 2022
NOTICE TYPE: W-B020422-01 Operations
SHORT DESCRIPTION: Implementation of maximum Shadow Price for an irresolvable constraint in SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAYS AFFECTED: February 5, 2022
LONG DESCRIPTION: On February 4, 2022, a constraint 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 February 4, 2022 and be effective on February 5, 2022. The contingency/constraint pair and updated maximum Shadow Price are as follows:
| Contingency Name |
Constraint Name |
From Station/kV |
Description |
Maximum Shadow Price |
| XFRE89 |
GILLES_AT1 |
GILLES/138 |
Loss of FREDER 138/69kV transformer overloads the 138/69kV transformer at GILLES |
3,117.05 $/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.
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