NOTICE DATE:  May 20, 2013
NOTICE TYPE:  W-052013-01 Operations
SHORT DESCRIPTION:  Implementation of maximum shadow price for an irresolvable non-competitive constraint in SCED
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  May 20, 2013
LONG DESCRIPTION:  On December 11, 2012, the ERCOT Technical Advisory Committee (TAC) approved the ERCOT Business Practice, Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch Version 6, with an effective date of December 12, 2012.

On May 20, 2013, ERCOT implemented a maximum shadow price for a non-competitive constraint that was found to be irresolvable and also met the criteria of Section 3.6.1(B) of the business practice document. The contingency/constraint pair and maximum shadow price (set in accordance with Section 3.6.2) are as follows:

Contingency Name

Constraint Name

Description

Maximum Shadow Price

XWI2N89

6920_E_1

Wink TNP Autotransformer 138/69 KV
overloads
Wink TNP - Wink Sub 69 kV

$2,000.00



ADDITIONAL INFORMATION:  The business practice document is posted under Key Documents on the Real-Time Market webpage at http://www.ercot.com/mktinfo/rtm/.
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