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NOTICE DATE: November 27,2019

NOTICE TYPE: M-C112719-01 NPRR

SHORT DESCRIPTION: Implementation Details of NPRR911

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: December 12, 2019

LONG DESCRIPTION: On December 12, 2019, Protocol language related to Nodal Protocol Revision Request (NPRR) 911, Improved Calculation of Real-Time LMPs at Logical Resource Nodes for On-Line Combined Cycle Generation Resources, will be implemented.  

The pre-NPRR911 Protocol language calculates the Locational Marginal Price (LMP) for a Combined Cycle Generation Resource (CCGR) using a weighted average of the Shift Factors for each Generation Resource in the On-Line CCGR using the Real-Time telemetered outputs of the Generation Resources to calculate the weight factor.

NPRR911 reverts the applicable Protocol sections back to previous language for determining Real-Time LMPs of the logical Resource Nodes for On-Line CCGRs. Reverting the Protocol language back results in those CCGR LMPs being based on a weighted average of LMPs at the Resource Node for each of the Generation Resources in the On-Line CCGRs, using the Real-Time telemetered outputs of the Generation Resources to calculate the weight factor.

NPRR911 also retains the language from NPRR890, Correction to Calculation of Real-Time LMPs at Logical Resource Node for On-Line Combined Cycle Generation Resources, that clarifies the formula for Off-Line CCGRs.

ADDITIONAL INFORMATION: Pursuant to Nodal Protocol Section 21.6, Nodal Protocol Revision Implementation, ERCOT is required to provide notice as soon as practicable, but no later than ten days prior to implementation.

NPRR911 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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mm/nb