Operations

Fri, Feb 19, 2021 02:55 PM

W-B021921-01 Implementation of maximum Shadow Price for an irresolvable constraint in SCED


NOTICE DATE:  February 19, 2021

NOTICE TYPE:  W-B021921-01 Operations

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

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  February 19, 2021

LONG DESCRIPTION:  On Operating Day (OD) February 18, 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.  Also, on the same OD, this irresolvable constraint accumulated a net margin larger than $95,000/MW, per the criteria defined in Section 3.6.2 of the OBD.

Per the calculations described in the OBD, the maximum Shadow Price was then re-determined as $2,000/MWh, in accordance with Section 3.6.2 of the OBD. The update to the maximum Shadow Price will be implemented between 2:00PM and 3:00PM Central Prevailing Time (CPT) on OD February 19, 2021. The contingency/constraint pair and maximum Shadow Price are as follows:

Contingency Name

Constraint Name

From Station/kV

Description

Maximum Shadow Price

SBEVASH8

HAMILT_MAVERI1_1

HAMILTON/138

Loss of the ASHERTON to BEVO 138kV line overloads the 138kV line from HAMILTON to MAVERICK

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 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, 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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dsl