NOTICE DATE:  January 20, 2015
NOTICE TYPE:  W-B012015-01 Operations
SHORT DESCRIPTION:  Non-Spin Reserve Service (NSRS) and Responsive Reserve Service (RRS)
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  June 1, 2015
LONG DESCRIPTION:  At its December 9, 2014, meeting the ERCOT Board of Directors approved the 2015 Methodology for Determining Minimum Ancillary Service Requirements. Changes to the Methodology related to Responsive Reserve Service (RRS) and Non Spinning Reserve Service (NSRS) will be effective beginning June 1, 2015.
A summary of those changes are listed here:

*         Rather than procuring a constant amount of RRS for every hour of the year, ERCOT will annually calculate varying amounts of RRS to be procured for various hour blocks by month based on projected system conditions.

*         RRS quantities will be determined for six 4-hour blocks for each month representing the fixed minimum values that will be procured in the Day-Ahead Market.

*         The portion (500MW) of the calculated NSRS requirement that was being procured through RRS will no longer be procured through RRS, but will remain in NSRS.

The 2015 RRS quantities have been posted to the ERCOT Market Information System (MIS) under the Projected Ancillary Service Requirements link under Medium-Term System Adequacy. See the link below. The NSRS quantities are the projected quantities and will be finalized by 20th day of each month for upcoming month.
https://mis.ercot.com/pps/tibco/mis/Pages/Grid+Information/Forecasts
The December 9 presentation to the Board of Directors by ERCOT System Operations, including the accompanying decision document and projected AS quantities for 2015, are located at the following link:
http://www.ercot.com/content/meetings/board/keydocs/2014/1209/6_2015_Methodology_for_Determining_Minimum_Ancillary_Service.pdf

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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