NOTICE DATE: July 24, 2014

NOTICE TYPE: W-A072414-01 Operations

SHORT DESCRIPTION: Implementation of maximum shadow price for an irresolvable constraint in SCED

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: July 24, 2014

LONG DESCRIPTION: On July 24, 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
SSALSK28	6146__A	Loss of the 138 kV line from Skywest to Salt Flat Road overloading the 138 kV line from Midland East to Buffalo	$2,377.57

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

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