NOTICE DATE:  September 4, 2008

NOTICE TYPE:  W-A062408-03 PRR/SCR

CLASSIFICATION:  Public

SHORT DESCRIPTION:  Implementation of PRR763, Use of WGRPP as Planned
Operating Level in Day-Ahead Resource Plan for WGRs.

INTENDED AUDIENCE:  QSE Operations and Wind Resource Entity Personnel

DAY AFFECTED:  Operating Day September 1, 2008

LONG DESCRIPTION:   In accordance with Protocol Revision Request (PRR)
763,  on July 1, 2008 ERCOT began using Wind-powered Generation
Production Potential (WGRPP) as the planned operating level in Resource
Plans for Wind-powered Generation Resources (WGRs).  ERCOT  provides the
WGRPP forecast to each QSE representing WGRs via email on an hourly
basis.  Each forecast covers a rolling 48-hour period. 

ACTION REQUIRED:  Please remember, as of September 1, 2008, QSEs shall
update Resource Plans using WGRPP forecasts upon receiving notice from
ERCOT for an Adjustment Period RPRS Market.

HOUR-AHEAD:  As of September 1, 2008, if ERCOT must procure additional
RPRS during the Adjustment Period (pursuant to ERCOT Protocol Section
6.6.3.2.1, Specific Procurement Process Requirements for Replacement
Reserve Service in the Adjustment Period), QSEs representing WGRs must
update (with the latest forecast received) the forecasted WGRPP for the
Operating Hour that energy from the RPRS Resources is required.  QSEs
must use, the most current WGRPP forecast  to update their WGR Resource
Plans for the Adjustment Period RPRS Market. 

ADDITIONAL INFORMATION:  After the close of an Adjustment Period RPRS
Market, QSEs representing WGRs may update their Resource Plans and
schedules to reflect the expected wind-powered generation production.

The documents related to the PRR referenced in this Notice are available
at: http://www.ercot.com/mktrules/protocols/prr.html
http://www.ercot.com/mktrules/issues/prr/750-774/763/index
<http://www.ercot.com/mktrules/issues/prr/750-774/763/index> 

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] <blocked::mailto:[log in to unmask]> .

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