NOTICE DATE:  October 28, 2009

NOTICE TYPE:  M-A052909-05 PRR

SHORT DESCRIPTION:  Update - Implementation Details of PRR803, Revised Implementation Approach for PRR601

INTENDED AUDIENCE:  QSEs and Resource Entities

DAY AFFECTED:  October 29, 2009

LONG DESCRIPTION: PRR803 is changing the ramping period for Base Power Schedules and Balancing Energy Power Schedules from ten (10) minutes to fourteen (14) minutes. This change is designed to provide more efficient dispatch and to allow the deployment of more Balancing Energy Services.

PRR803 will be implemented by ERCOT effective the first interval (00:15 interval) of Thursday, October 29, 2009.

The ERCOT Control Room will announce the start of the code migration via Hot Line call to Qualified Scheduling Entities (QSEs) at approximately 23:40, October 28.  Then repeat the Hot Line upon completion of migration.  It is anticipated that the migration will be completed in time to issue the first 14-min ramp period for Interval Ending 00:15, October 29.

If there are any issues, another Hot Line call will be made to inform QSEs.

ACTION REQUIRED:  Qualified Scheduling Entities (QSEs) should be prepared and have personnel ready to make their required system changes for the first interval of Thursday, October 29, 2009.

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].

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