Title: Creation of a WGR Group for GREDP and Base Point Deviation Evaluation and Mixing Turbine Types Within a WGR (formerly "Creation of a WGR Group for GREDP and Base Point Deviation Evaluation")
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Status: Approved on 11/13/2012
Effective Dates:



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Date Gov Body Action Taken Next Steps
11/13/2012 BOARD Approved
10/04/2012 TAC Recommended for Approval ERCOT Board consideration
09/07/2012 TAC Deferred/Tabled TAC consideration of NPRR425
07/19/2012 PRS Recommended for Approval TAC consideration of NPRR425
06/21/2012 PRS Recommended for Approval PRS Impact Analysis review
04/19/2012 PRS Deferred/Tabled PRS Impact Analysis review
03/22/2012 PRS Deferred/Tabled PRS Impact Analysis review
02/23/2012 PRS Recommended for Approval PRS Impact Analysis review
11/17/2011 PRS Deferred/Tabled PRS language consideration

Voting Record

Date Gov Body Motion Result
11/13/2012 BOARD To approve NPRR425 as recommended by TAC in the 10/4/12 TAC Report. Passed
10/04/2012 TAC To recommend approval of NPRR425 as recommended by PRS in the 7/19/12 PRS Report and as amended by the 9/26/12 ERCOT comments and 9/27/12 Wind Coalition comments.
09/07/2012 TAC To table NPRR425. Passed
07/19/2012 PRS To endorse and forward the 6/21/12 PRS Report and Impact Analysis for NPRR425 to TAC with a recommended priority of 2013 and rank of 770. Passed
06/21/2012 PRS To endorse the 2/23/12 PRS Report as amended by the 6/11/12 ERCOT comments and to direct that NPRR425 and a revised Impact Analysis return to the July 2012 PRS meeting. Passed
04/19/2012 PRS To table NPRR425. Passed
03/22/2012 PRS To table NPRR425 and to request that WMS and the QSE Managers Working Group (QMWG) review NPRR425. Passed
02/23/2012 PRS To recommend approval of NPRR425 as amended by the 2/17/12 E.ON comments. Passed
11/17/2011 PRS To table NPRR425. 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: Nov 1, 2011
Sponsor: ERCOT
Urgent: No
Sections: 2.1,,,
Description: This Nodal Protocol Revision Request (NPRR) provides that Wind-powered Generation Resources (WGRs) meeting registration requirements will be evaluated for Generation Resource Energy Deployment Performance (GREDP) and Base Point Deviation as groups of WGRs rather than individual WGRs. This NPRR also permits multiple wind turbine models or sizes to be combined in a single WGR if certain criteria are met.
Reason: In Protocol Revision Request (PRR) 830, Reactive Power Capability Requirement, ERCOT modified the definition of a "Wind-powered Generation Resource" in order to obtain a more accurate representation of the reactive capabilities of the aggregated turbines of the same model and size for reactive modeling purposes. However, for Dispatch purposes, many Qualified Scheduling Entities (QSEs) / Resource Entities representing WGRs are not able to independently Dispatch those WGRs due to control limitations. Therefore, ERCOT believes an acceptable solution to this problem is to create a WGR Group for Dispatch purposes while still maintaining the WGR definition for reactive modeling purposes. The creation of the WGR Group also addresses the Base Point Deviation treatment for these WGRs under their current operational capabilities. By allowing multiple wind turbine models or sizes to be combined in a single WGR, Market Participants may avoid the burden of having to register and operate additional WGRs due to the replacement of wind turbines if the replacement turbines have similar, if not exact characteristics, or due to the installation of a de minimis number of turbines that may have different characteristics from the majority of turbines in the WGR for the purpose of testing new technologies, so long as it does not reduce ERCOT’s ability to model pre- and post-contingency conditions on the ERCOT Transmission Grid.

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