NOTICE DATE:  November 3, 2014
NOTICE TYPE:  W-A110314-01 Operations
SHORT DESCRIPTION:  Implementation of shadow price cap for an irresolvable non-competitive constraint in SCED that has exceeded a net margin of $95,000
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  November 3, 2014
LONG DESCRIPTION:  On October 28, 2014, a shadow price cap of $2,000.00 was implemented for the SAPACAD8/HEIGHTTN_HAT1 contingency/constraint pair in accordance with the ERCOT Business Practice, Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch. This document requires a new cap to be implemented once the net margin calculation of Section 3.6.3 reaches $95,000. The net margin for this contingency/constraint pair reached $95,000 on Friday, October 31. However, since the prescribed calculation results in the same value as the existing shadow price cap of $2,000, the shadow price cap remains unchanged.
The contingency/constraint pair and shadow price cap are as follows:
Contingency Name

Constraint Name

Description

Maximum Shadow Price

SAPACAD8

HEIGHTTN_HAT1

Loss of the 138 kV line from Caddo Switching Station TNP to Apache TNP overloading the 138/69 kV Heights TNP Autotransformer #1

$2,000.00


ADDITIONAL INFORMATION:  The business practice document, Methodology for Setting Maximum shadow Process for Network and Power Balance constraints, is posted under Key Documents on the Real-Time Market webpage at http://www.ercot.com/mktinfo/rtm/.
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