operations

9/23/19 12:10 PM

W-A092319-01 Implementation of maximum Shadow Price for an irresolvable constraint in SCED


NOTICE DATE: September 23, 2019

NOTICE TYPE: W-A092319-01 Operations

SHORT DESCRIPTION: Implementation of maximum Shadow Price for an irresolvable constraint in SCED

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: September 23, 2019

LONG DESCRIPTION: On September 23, 2019, ERCOT will be implementing a modified maximum Shadow Price for 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. The update to the maximum Shadow Price will occur between 1:00 PM and 2:00 PM Central Prevailing Time (CPT) on September 23, 2019.  The contingency/constraint pair and updated maximum Shadow Price are as follows:

Contingency Name

Constraint Name

From Station/kV

Description

Maximum Shadow Price

SECNMO28

6100__G

ACSSW /138

Loss of Moss Switch to  Yukon Switch 138kV line overloads the 138kV line from Andrews County South to Amoco Three Bar Tap

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 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 ClientServices@ercot.com.

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