Operations

Tue, Mar 24, 2020 06:45 PM

W-A032420-01 Implementation of maximum Shadow Price for an irresolvable constraint in SCED


NOTICE DATE:  March 24, 2020

NOTICE TYPE:  W-A032420-01 Operations

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

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED:  March 24, 2020

LONG DESCRIPTION:  On March 24, 2020, 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 2:00 PM and 3:00 PM Central Prevailing Time (CPT) on March 24, 2020.  The contingency/constraint pair and updated maximum Shadow Price are as follows:

Contingency Name

Constraint Name

From Station/kV

Description

Maximum Shadow Price

DWINDUN8

6100__G

ACSSW /138

Loss of WINK to DUNK Switch and YUKON138kV lines 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) that 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 OBD, 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 or these resources: 
ERCOT Client Services – (512) 248-3900 or ClientServices@ercot.com
ERCOT HelpDesk – (512) 248-6800 or (866) 870-8124 or HelpDesk@ercot.com

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 dg