NOTICE DATE: October 21, 2019
NOTICE TYPE: M-B102119-01 Operations
SHORT DESCRIPTION: Implementation of maximum Shadow Price for an irresolvable constraint in SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAY AFFECTED: October 21, 2019
LONG DESCRIPTION: On October 21, 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 OBD defined calculation for the updated maximum Shadow Price results in the value remaining at $3,500/MWh. The contingency/constraint pair and maximum Shadow Price are as follows:
| Contingency Name |
Constraint Name |
From Station/kV |
Description |
Maximum Shadow Price |
| SHACPB38 |
RIOPEC_WOODW21_1 |
RIOPECOS /138 |
Loss of Yucca Switch to Lotebush 138kV line overloads the 138kV line from Rio Pecos(RIOPECOS) to Woodward 2 (WOODWRD2) |
3,500 $/MWh |
For constraints that have been identified as consistently irresolvable, the 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].
If you are receiving email from a public ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com.
nb