OTICE DATE: February 16, 2021
NOTICE TYPE: W-A021620-01 Operations
SHORT DESCRIPTION: Implementation of maximum Shadow Price for an irresolvable constraint in SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAY AFFECTED: February 16, 2021
LONG DESCRIPTION: On February 16, 2021, 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. Per the calculations described in the OBD, the maximum Shadow Price will remain 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 |
| SCRDJON5 |
915__E |
CMBSW/138 |
Loss of the JOHNSON SWITCH (ONCOR) to CONCORD 345kV Single Circuit overloads the 138kV Line from DECORDOVA DAM to CARMICHAEL BEND SWITCH |
3,500 $/MWh |
This maximum Shadow Price will be used for all constraints in Security Constrained Economic Dispatch (SCED) that share the same monitored element (i.e. constraint name) and direction.
ADDITIONAL INFORMATION: The Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints can be found under Key Documents on the Real-Time Market webpage and under the Other Binding Documents List on the ERCOT website.
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