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/.
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
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