NOTICE DATE:  June 13, 2008



SHORT DESCRIPTION:  Temporary Change to LFC Regulation Deployment for the LFC Tests on June 19 and the week of June 23.

INTENDED AUDIENCE:  LFC Contacts and Accountable Executives

DAY AFFECTED:  Beginning June 13, 2008

LONG DESCRIPTION:  ERCOT will honor the ten minute ramp rate during the test by modifying the LFC Regulation calculation (ten instead of five minutes ramp) and by temporarily modifying the LFC SURAMP and SDRAMP calculations.


         SURAMP = Ramp Rate – (Regulation Up AS Responsibility / 10)

         SDRAMP = Ramp Rate – (Regulation Down AS Responsibility / 10)

         LFC will calculate Regulation to be deployed over a 10 minute ramp rate not a 5 minute. 

ACTION REQUIRED:  All QSEs should ensure that their Nodal ancillary service responsibilities match their Zonal ancillary service obligations during normal business hours starting on June 16, 2008 through June 27, 2008.  During this time QSEs must also ensure that their Responsive Reserve Service and Non-Spin schedules are being correctly calculated.  Lastly, QSEs must ensure that their Regulation Service participation factors are being sent to ERCOT and properly represent the manner in which the QSE is deploying it’s Regulation dispatch signals.  As a reminder, the participation factors are a fraction between 0 and 1 and should sum to 1 within a QSE.

ADDITIONAL INFORMATION:  This change will keep Nodal in line with Zonal for the handling of Regulation Deployments for the testing planned the next two weeks.

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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