NOTICE DATE: April 24, 2023
NOTICE TYPE: W-D042423-01 Operations
SHORT DESCRIPTION: Implementation of maximum Shadow Price for an irresolvable constraint in SCED
INTENDED AUDIENCE: All Market Participants
DAYS AFFECTED: April 24, 2023
LONG DESCRIPTION: On April 24, 2023, ERCOT will be implementing a modified maximum Shadow Price for a constraint that was found to be irresolvable on April 24, 2023 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 be implemented between 5:00 PM and 6:00 PM Central Prevailing Time (CPT) on April 24, 2023 and be effective starting April 24, 2023. The contingency/constraint pair and updated maximum Shadow Price are as follows:
| Contingency Name |
Constraint Name |
From Station/kV |
Description |
Maximum Shadow Price |
| MCONQAL5 |
6471__A |
MGSES/138 |
Loss of the Consavvy Switch (CONSW) to Midessa South Switch (MMDSW) 345kV and Consavvy Switch (CONSW) to Quail Switch (QALSW) 345kV lines overloads the 138 kV line from Morgan Creek SES (MGSES) to Forest Creek & Sand Bluff Wind Farms (MCDLD) |
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 the Key Documents section on the Real-Time Market page, and under the Other Binding Documents List page.
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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