***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. *****

NOTICE DATE:  May 17, 2018

NOTICE TYPE:  W-A051718-01 Operations

SHORT DESCRIPTION:  Implementation of maximum Shadow Price for an irresolvable constraint in SCED

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  May 18, 2018

LONG DESCRIPTION:  On May 18, 2018, ERCOT will be 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, which can be found in the Other Binding Document (OBD), Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints. The update to the maximum Shadow Price will occur between 8:00 AM and 9:00 AM Central Prevailing Time (CPT) on May 18, 2018.  The contingency/constraint pair and updated maximum Shadow Price are as follows:

Contingency Name

Constraint Name

From Station/kV

Description

Maximum Shadow Price

SJUNYEL9 <http://trend.ercot.com/RealTimeMarket/IrresolvableConstraints?date=20180517>

HEXT_YELWJC1_1

YELWJCKT/69

Loss of Yellow Jacket to Junction 69KV line overloads the Yellow Jacket to Hext LCRA 69 kV line

2,000 $/MWh



This new maximum Shadow Price will be used for all constraints in Security Constrained Economic Dispatch (SCED), which share the same monitored element (i.e. constraint name) and direction.

ADDITIONAL INFORMATION:  The ERCOT business practice document, Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch, can be found in the Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints under Key Documents on the Real-Time Market webpage<http://www.ercot.com/mktinfo/rtm/>, and under the Other Binding Documents List<http://www.ercot.com/mktrules/obd/obdlist>, both of which are on the ERCOT website.

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]>.

If you are receiving email from a public ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com.









sa