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NPRR #86 · Revision Request

NPRR086  Settlement Clarifications to RUC Capacity Shortfall Ratio Share Formula

Approved sponsor TPTF posted 2007-10-25 ercot.com
ReasonThe current language in Section 5.7.4.1.1 does not include DC Tie imports and exports when calculating the Qualified Scheduling Entity’s (QSE’s) Capacity at each RUC process. The inclusion of DC Tie activity is necessary to correctly reflect each QSE’s Capacity at each RUC process as specified in paragraph (3) of Section 4.4.4, DC Tie Schedules. Also, the current variable definition of ‘HASLADJ’ in Section 5.7.4, RUC Make Whole Charges, includes a specific concept that would be better presented be in a separate paragraph rather than the variable description.In addition, the definition of LSL in Section 5 needs clarification that the LSL value used in the RUC calculations will come from the COP and is not the telemetered value.
Created2007-11-15
Approved2008-01-15
Sections Affected
5.7.1.1RUC Guarantee; 5.7.1.2RUC Minimum-Energy Revenue; 5.7.1.3Revenue Less Cost Above LSL During RUC-Committed Hours; 5.7.1.4Revenue Less Cost During QSE Clawback Intervals; 5.7.3Payment When ERCOT Decommits a QSE -Committed Resource; and 5.7.4.1.1Capacity Shortfall Ratio Share
Summary
This NPRR revises Section 5.6.4.1.1 to clarify that the Capacity Shortfall Ratio Share includes DC Tie imports and exports; modifies the definition of the variable HASLADJ (High Ancillary Service Limit) used in calculating the Reliability Unit Commitment (RUC) Capacity Shortfall Ratio Share in Section 5.7.4. ; and modifies the definition of the variable LSL to reflect that its value is the same as the Low Sustained Limit (LSL) in the Current Operating Plan (COP).
Timeline