NOTICE DATE: October 23, 2019
NOTICE TYPE: W-A102319-01 Operations
SHORT DESCRIPTION: Implementation of maximum Shadow Price for an irresolvable constraint in SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAYS AFFECTED: October 23, 2019
LONG DESCRIPTION: On October 23, 2019, ERCOT has identified 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. Although the criteria has been met, the defined calculation for the updated maximum Shadow Price results in a $2,000/MWh value. The contingency/constraint pair and maximum Shadow Price are as follows:
| Contingency Name |
Constraint Name |
From Station/kV |
Description |
Maximum Shadow Price |
| DWINDUN8 |
6100__F |
DHIDE/138 |
Loss of WINK to DUNK Switch and YUKON138kV lines overloads the 138kV line from Dollarhide (DHIDE) to No Trees Switch (NOTSW) |
2,000 $/MWh |
This 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 [log in to unmask].
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