NOTICE DATE:  September 23, 2014
NOTICE TYPE:  W-A092314-01 Operations
SHORT DESCRIPTION:  Implementation of maximum shadow price for an irresolvable constraint in SCED
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  September 23, 2014
LONG DESCRIPTION:  On September 23, 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

STEJGR38

HEIGHTTN_HAT2

Loss of the 138 kV line from Tejas TNP to Greenbelt TNP overloading the 69/138 kV transformer at Heights TNP

$2,000.00


ADDITIONAL INFORMATION:  The business practice document is posted under Key Documents on the Real-Time Market webpage<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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