Title: ERCOT Publication of DAM PSS/E Files
Next Group:
Next Step:
Status: Approved on 04/19/2011
Effective Dates:

Section 4.2.3(a)-(b)


All remaining sections


Date Gov Body Action Taken Next Steps
04/19/2011 BOARD Approved
03/03/2011 TAC Recommended for Approval ERCOT Board for consideration.
02/17/2011 PRS Recommended for Approval TAC for consideration.
01/20/2011 PRS Recommended for Approval PRS for Impact Analysis review.
12/16/2010 PRS Deferred/Tabled PRS for consideration.
11/18/2010 PRS Deferred/Tabled PRS for consideration.

Voting Record

Date Gov Body Motion Result
04/19/2011 BOARD To approve NPRR290 as recommended by TAC in the 3/3/11 TAC Report. Passed
03/03/2011 TAC To recommend approval of NPRR290 as recommended by PRS in the 2/17/11 PRS Report as revised by TAC. Passed
02/17/2011 PRS To endorse and forward the 1/20/11 PRS Report as amended by the 2/16/11 ERCOT comments, Impact Analysis and Cost Benefit Analysis for NPRR290 to TAC with a recommended priority of High and a rank of 13. Passed
01/20/2011 PRS To recommend approval of NPRR290 as amended by the Luminant Energy comments and as revised by PRS. Passed
12/16/2010 PRS To table NPRR290 for one month. Passed
11/18/2010 PRS To table NPRR290 for one month; to request that ERCOT implement the manual workaround based on the model load schedule as done in market trials and as resources allow; and to provide estimated costs for the various options of implementation. 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 27, 2010
Sponsor: Henry Durrwachter on behalf of Luminant Energy Company LLC
Urgent: No
Sections: 4.2.3
Description: This Nodal Protocol Revision Request (NPRR) enhances transparency of the transmission topology (including all scheduled Outages) used in the Day-Ahead Market (DAM) by requiring ERCOT to publish certain data files (in Power System Simulator for Engineering (PSS/E format) for easy review by all Market Participants with standard power flow tools such as PTI PSS/E, Power World Simulator, etc. Much of the tools needed by ERCOT to meet the requirements of this NPRR were developed and semi-automated during the Nodal DAM market trials and this NPRR seeks to leverage that work for long term market benefit.
Reason: The original intent of the Market Participants was to have incremental updates published by ERCOT on a daily basis so that they could properly model the ERCOT System and replicate the DAM solution. ERCOT has stated in the Nodal Advisory Task Force (NATF) meetings and through the "Networking Modeling Expectations for TSP, REs, and QSEs" whitepaper that it will not be able to comply with the Protocol requirement to provide daily model updates. Therefore, to provide Market Participants the transparency and ability to review the implied power flows of the DAM solution, this NPRR adds a requirement for ERCOT to post daily on the Market Information System (MIS) Public Area a package of transmission data files in PSS/E format that describe each hour’s associated transmission system topology (including contingencies) and mapping of generators, Loads, transmission lines, transformers, and Hubs.

Key Documents

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