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NPRR086

Summary

Title Settlement Clarifications to RUC Capacity Shortfall Ratio Share Formula
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Status Approved on 01/15/2008
Effective Dates
12/01/2010

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

Background

Status: Approved
Date Posted: Oct 25, 2007
Sponsor: TPTF
Urgent: No
Sections: 5.7.1.1, RUC Guarantee; 5.7.1.2, RUC Minimum-Energy Revenue; 5.7.1.3, Revenue Less Cost Above LSL During RUC-Committed Hours; 5.7.1.4, Revenue Less Cost During QSE Clawback Intervals; 5.7.3, Payment When ERCOT Decommits a QSE -Committed Resource; and 5.7.4.1.1, Capacity Shortfall Ratio Share
Description: 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).
Reason: The 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.

Key Documents

086NPRR-01 TPTF Voting Ballot 100807
Oct 15, 2007 - xls - 114.5 KB
086NPRR-02 Settlement Clarifications to RUC Capacity Shortfall R
Oct 25, 2007 - doc - 280 KB
086NPRR-03 PRS Recommendation Report 111507
Nov 19, 2007 - doc - 270.5 KB
086NPRR-04 Impact Analysis 121207
Dec 12, 2007 - doc - 49.5 KB
086NPRR-05 PRS Recommendation Report 121307
Dec 17, 2007 - doc - 272.5 KB
086NPRR-06 TAC Recommendation Report 010308
Jan 4, 2008 - doc - 276.5 KB
086NPRR-07 Board Action Report 011508
Jan 15, 2008 - doc - 279.5 KB
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