NOTICE DATE:  October 28, 2014
NOTICE TYPE:  W-A102814-01 Operations

SHORT DESCRIPTION:  Implementation of maximum shadow price for an irresolvable constraint in SCED
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  October 28, 2014
LONG DESCRIPTION:  On October 28, 2014, ERCOT is 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 business practice document, "Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch."  The contingency/constraint pair and maximum shadow price (set in accordance with Section 3.6.2 of that same document) 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/.
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 [log in to unmask]<mailto:[log in to unmask]>.
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