NOTICE DATE: April 22, 2022


SHORT DESCRIPTION: Implementation Details of SCR800, Preparing for the addition of Predicted DC Tie Ramp Rate to Generation To Be Dispatched Calculation

INTENDED AUDIENCE: Qualified Scheduling Entities

DAYS AFFECTED: May 26, 2022

LONG DESCRIPTION: On May 26, 2022, System Change Request (SCR) 800, Addition of DC Tie Ramp to GTBD Calculation will be implemented.  

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 Predicted DC Tie Ramp Rate (PDCTRR) times five and a configurable factor. This addition will help Security-Constrained Economic Dispatch (SCED) take into account the anticipated 5-minute DC tie 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) – (net filtered non-conforming Load)] + K3*5*PLRR + K4*Regulation Deployed - K5*ACE Integral – K6*5*PWRR + K7*5*PDCTRR – K8*5*PSRR

Upon implementation of SCR 800, K7 value will be set to zero and the GTBD calculation will not be impacted. ERCOT is planning to set K7 to a non-zero value starting on June 1, 2022. ERCOT will send a Market Notice following the completion of this activity.

ADDITIONAL INFORMATION: SCR800 and associated documents can be found on the ERCOT website.

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].

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