Title: Planning Reserve Margin
Next Group:
Next Step:
Status: Approved on 03/19/2013
Effective Dates:


Date Gov Body Action Taken Next Steps
03/19/2013 BOARD Approved
01/03/2013 TAC Recommended for Approval ERCOT Board Consideration
11/29/2012 TAC Deferred/Tabled TAC Consideration
11/15/2012 PRS Recommended for Approval TAC Consideration
10/18/2012 PRS Recommended for Approval PRS IA Review

Voting Record

Date Gov Body Motion Result
03/19/2013 BOARD To approve NPRR489 as revised by the 2/18/13 ERCOT Comments Passed
01/03/2013 TAC To recommend approval of NPRR489 as amended by the 12/7/12 NRG Energy, Inc. comments Passed
11/29/2012 TAC To table NPRR489 Passed
11/15/2012 PRS To endorse and forward the 10/18/12 PRS Report and Impact Analysis for NPRR489 to TAC Passed
10/18/2012 PRS To recommend approval of NPRR489 as amended by the 10/17/12 ERCOT comments and as revised by PRS Passed

Vote tallies here reflect individual votes, not the weight of the votes by market segment. Affirmative votes are not recorded in these vote tallies. For additional details on the voting record, please consult the Recommendation or Action Report, or the official vote tally if available, as posted in the key documents.


Status: Approved
Date Posted: Oct 3, 2012
Sponsor: NRG Energy, Inc.
Urgent: No
Sections: 2.1, 2.2, 3.2.6 (new), (new), (new), (new), (new), 21.1
Description: This Nodal Protocol Revision Request (NPRR) adds the Planning Reserve Margin (PRM) methodology, currently in the Planning Guide, to the Protocols.
Reason: The calculation methodology used by ERCOT to determine the PRM for the semi-annual Capacity, Demand and Reserves Report has historically been developed by the Generation Adequacy Task Force (GATF), subsequently approved by the Wholesale Market Subcommittee (WMS), and then ultimately approved by the Technical Advisory Committee (TAC). In 2010, Market Participants decided that adding the PRM methodology into the Planning Guide would increase the transparency of the PRM methodology, and also provide a formal change and approval procedure via the Planning Guide Revision Request (PGRR) process. Including the PRM methodology in the Planning Guide also provided for ERCOT Board approval. The PGRR approval requires a recommendation from the Planning Working Group (PLWG), the Reliability and Operations Subcommittee (ROS), TAC, and finally ERCOT Board approval. While this approval path achieved its objective (i.e., to improve and formalize the PRM approval process) it did not include language acknowledging that the PRM methodology had historically been under GATF and WMS purview. Discussions at WMS and ROS resulted in both subcommittees agreeing the PRM calculation methodology: (1) Is important enough that it needs to be transparent; (2) Needs input from WMS, ROS, and any other interested stakeholder body or Market Participant, and (3) Should receive ERCOT Board approval. It was also determined the best way to meet these three goals is to move the PRM methodology from the Planning Guide to the Protocols.

Key Documents

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