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PGRR #22 · Revision Request

PGRR022  Removal of Planning Reserve Margin Calculation Methodology

Approved sponsor NRG Energy, Inc. posted 2012-10-05 ercot.com
ReasonThe calculation methodology used by ERCOT to determine the PRM for the semi-annual Report on Capacity, Demand and Reserves in the ERCOT Region (CDR) has historically been developed by the Generation Adequacy Task Force (GATF), subsequently approved by WMS, and then ultimately approved by 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 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), ROS and 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.
Created2012-10-25
Approved2013-03-19
Sections Affected
1.2.12.12.288.18.28.38.3.18.3.2
Summary
This Planning Guide Revision Request (PGRR) deletes Section 8, Planning Reserve Margin, from the Planning Guide. The Planning Reserve Margin (PRM) is being added to the Protocols via Nodal Protocol Revision Request (NPRR) 489, Planning Reserve Margin.
Timeline