NOTICE DATE:  November 6, 2009
NOTICE TYPE:  M-B110609-01 Settlements
SHORT DESCRIPTION:  Back out and re-run of data aggregation process
INTENDED AUDIENCE:  QSE Settlements personnel
DAY AFFECTED:  Operating Day September 4, 2009
LONG DESCRIPTION:  For the Final Settlement of Operating Day September 4, 2009, Market Participants may notice slight differences when performing routine shadow settlement calculations. These differences may be attributed to the fact that the data aggregation process was re-run during the nightly batch process but the settlements process was not re-run and therefore used data from the first data aggregation process instead of the second. There was a minor change in the total system load reported between the two aggregation runs. The differences for two of the major bill determinants used in the settlements process are listed below.
The LTOTQSE difference are -0.1803 min and 0.6138 max MWhs.
The LQSECMUFE difference are -0.116 min and 0.6314 max MWhs.

Generation totals and Non Opt-In Entity (NOIE) load were not affected.

ERCOT will ensure that these differences are corrected and included in the True-Up run of this Operating Day.

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]>.
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