Title Settlement Clarifications to RUC Capacity Shortfall Ratio Share Formula
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Status Approved on 01/15/2008
Effective Dates

or per the Nodal Protocol Transition Plan http://www.ercot.com/mktrules/protocols (02/01/08 Nodal Protocols Library)

Voting Record

Date Gov Body Motion Result
01/15/2008 BOARD To approve as recommended by TAC. Passed
01/03/2008 TAC Recommended for approval as revised by TAC. Passed
12/13/2007 PRS To forward the Recommendation Report and IA to TAC for approval Passed
11/15/2007 PRS To recommend approval of NPRR086 as submitted Passed


Status: Approved
Date Posted: Oct 25, 2007
Sponsor: TPTF
Urgent: No
Sections:, RUC Guarantee;, RUC Minimum-Energy Revenue;, Revenue Less Cost Above LSL During RUC-Committed Hours;, Revenue Less Cost During QSE Clawback Intervals; 5.7.3, Payment When ERCOT Decommits a QSE -Committed Resource; and, Capacity Shortfall Ratio Share
Description: This NPRR revises Section 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).
Reason: The current language in Section 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.

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