NOTICE DATE:  December 20, 2010
NOTICE TYPE:  R-A122010-01 Retail Extracts
SHORT DESCRIPTION:  ERCOT IDR estimation calculated data is no longer provided in the Supplemental AMS Interval Data Extract and Supplemental IDR Required Interval Data Extract.
INTENDED AUDIENCE:  CRs and TDSPs
DAYS AFFECTED:  Operating Days December 1, 2010 forward
LONG DESCRIPTION:  As of the initial settlement of the December 1, 2010 Operating Day, the ERCOT IDR estimation calculated data is no longer provided in the Supplemental AMS Interval Data Extract and Supplemental IDR Required Interval Data Extract. These data records were represented in the extracts with ORIGIN = 'C' in the AMSINTERVAL & LSCHANNELCUTHEADER tables.
Market Participants subscribing to these extracts will continue to receive the ERCOT IDR estimates for all subsequent Zonal settlements for all Operating Days prior to December 1, 2010.
As a result of process efficiency changes in ERCOT's data aggregation and settlement batch process, our Nodal process no longer writes the ERCOT IDR estimates to the Settlements System.
ADDITIONAL INFORMATION:  Market participants may refer to Protocol Section 11.4.3.2 for the details of the Weather Sensitive Proxy Day Method and Protocol Section 11.4.3.3 for the details of the Non-Weather Sensitive Proxy Day Method.
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 e-mail at [log in to unmask]<mailto:[log in to unmask]>.
If you are receiving e-mail from an 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<http://lists.ercot.com/>.
JR/DH