Title Load Used in RMR Studies
Next Group
Next Step
Status Approved on 03/23/2010
Effective Dates


Date Gov Body Action Taken Next steps
03/23/2010 BOARD Approved
02/04/2010 TAC Recommended for Approval ERCOT Board consideration of PRR837
01/21/2010 PRS Recommended for Approval TAC consideration of PRR837
12/17/2009 PRS Recommended for Approval PRS Impact Analysis review
11/19/2009 PRS Deferred/Tabled PRS language consideration

Voting Record

Date Gov Body Motion Result
03/23/2010 BOARD To approve PRR837 as recommended by TAC in the 2/4/10 TAC Report and as amended by the 3/10/10 ERCOT comments. Passed
02/04/2010 TAC To recommend approval of PRR837 as recommended by PRS in the 1/21/10 PRS Report and as revised by TAC. Passed
01/21/2010 PRS To endorse and forward the 12/17/09 PRS Recommendation Report and Impact Analysis for PRR837 to TAC. Passed
12/17/2009 PRS To recommend approval of PRR837 as amended by the 11/12/09 PSEG TX comments. Passed
11/19/2009 PRS To table PRR837. Passed


Status: Approved
Date Posted: Oct 16, 2009
Sponsor: PSEG TX
Urgent: No
Description: This Protocol Revision Request (PRR) would provide guidance to ERCOT to use the peak Load forecast posted pursuant to P.U.C. Subst. R. 25.505, Resource Adequacy in the Electric Reliability Council of Texas Power Region, for the next 12 months for the Reliability Must-Run (RMR) study, except with respect to the Load in the RMR local area. This aligns the Load forecast period with the RMR contract period and ensures that the Load forecast used for the analysis is one with a reasonable probability of occurrence.This PRR also proposes non-substantive administrative changes, such as correcting acronym and defined term usage and section references.
Reason: The current process around how RMR studies are conducted is not defined in the Protocols. Providing guidance for the Load forecast used in the process ensures that a Load level that ERCOT actually anticipates will be used for the RMR study. Presently, ERCOT typically uses the aggregate non-coincident peak Loads provided by the transmission owners that are used to develop the five-year Steady State Working Group (SSWG) planning cases. Because these Loads are both peak and non-coincident, they tend to overestimate actual Load during any single period. Employing a process that uses a Load forecast that ERCOT actually anticipates to occur in the next 12 months will ensure that RMR is procured only when needed to serve load that will likely occur. The present process of using a Load forecast that significantly overestimates Load could result in procuring RMR when it is not needed. Procuring RMR when it is not needed increases costs to Load and undermines opportunities for competitive generation in ERCOT’s energy-only market.

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