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NOTICE DATE:  November 20, 2018
NOTICE TYPE:  M-B092418-03 Operations
SHORT DESCRIPTION:  Additional Implementation Details of SCR795 ¨C updated implementation date
INTENDED AUDIENCE:  Qualified Scheduling Entities
DAYS AFFECTED:  December 4, 2018
LONG DESCRIPTION:  On December 4, 2018 at 10:00 AM CST, ERCOT will activate System Change Request (SCR) 795, Addition of Intra-Hour Wind Forecast to GTBD Calculation.
This SCR updates the formula used by the Resource Limit Calculator to calculate the Generation To Be Dispatched (GTBD) value. The updated formula for GTBD will include the addition of the Intra-Hour Wind Power Forecast (IHWPF) via a calculated predicted wind ramp (PWRR) times five and a configurable factor. This addition will help Security-Constrained Economic Dispatch (SCED) take into account the anticipated 5-minute wind ramp in its 5-minute Base Points.
This change will result in the GTBD being calculated as the following:

GTBD = Total Gen + K1*10*System Load Frequency Bias + K2*[(net non-conforming Load) ¨C (net filtered non-conforming Load)] + K3*5*PLRR + K4*Regulation Deployed + K5*ACE Integral ¨C K6*5*PWRR

|PWRR| ¡Ü Max PWRR Threshold

During activation, the configuration factors in GTBD will be tuned to start including PWRR.
ADDITIONAL INFORMATION:  SCR795<http://www.ercot.com/mktrules/issues/SCR795> and associated documents can be found on the ERCOT website.
Please review the ERCOT website for previous Market Notices<http://www.ercot.com/services/comm/mkt_notices/archives/search?nc=all&per=&pg=&q=M-B092418&sort=> related to this subject.
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 email at [log in to unmask]<mailto:[log in to unmask]>.
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