NOTICE DATE: September 8, 2023
NOTICE TYPE: W-C090823-01 Operations
SHORT DESCRIPTION: Implementation of maximum Shadow Price for an irresolvable constraint in SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAY AFFECTED: September 8, 2023
LONG DESCRIPTION: ERCOT has identified a transmission constraint that has met the criteria of being considered irresolvable on September 7, 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. In performing the analysis required by the OBD, ERCOT has determined that the maximum Shadow Price should remain at its current value of $3,500/MWh. This maximum Shadow Price will remain in effect until otherwise notified through a Market Notice. The contingency/constraint pair and maximum Shadow Price are as follows:
| Contingency Name |
Constraint Name |
From Station/kV |
Description |
Maximum Shadow Price |
| DAUSDUN8 |
608T608_1 |
GIDEON/138 |
Loss of the Austrop to Daffin Gin and AEN Dunlap to Decker Power Plant 138kV lines overload the 138 kV line from Sim Gideon to Bastrop City |
3,500 $/MWh |
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 [log in to unmask].
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