Title: Negative Price Floor (formerly "Security Violation Analysis and Reporting and Negative Price Floor")
Next Group:
Next Step:
Status: Approved on 12/11/2012
Effective Dates:


Date Gov Body Action Taken Next Steps
12/11/2012 BOARD Approved
11/29/2012 TAC Recommended for Approval ERCOT Board consideration of NPRR385
11/15/2012 PRS Recommended for Approval TAC consideration of NPRR385
10/18/2012 PRS Recommended for Approval PRS Impact Analysis review
09/22/2011 PRS Deferred/Tabled PRS Impact Analysis review
08/18/2011 PRS Deferred/Tabled PRS Impact Analysis review
07/21/2011 PRS Recommended for Approval PRS Impact Analysis review

Voting Record

Date Gov Body Motion Result
12/11/2012 BOARD To approve NPRR385 as recommended by TAC in the 11/29/12 TAC Report. Passed
11/29/2012 TAC To recommend approval of NPRR385 as recommended by PRS in the 11/15/12 PRS Report. Passed
11/15/2012 PRS To endorse and forward the 10/18/12 PRS Report as amended by the 11/14/12 ERCOT comments and Impact Analysis for NPRR385 to TAC with a recommended priority of 2013 and rank of 367. Passed
10/18/2012 PRS To endorse the 7/21/11 PRS Report for NPRR385 as amended by the 10/16/12 Luminant Energy Company LLC comments and to request that NPRR385 return to the November 15, 2012 PRS meeting with an Impact Analysis. Passed
09/22/2011 PRS To table NPRR385. Passed
08/18/2011 PRS To table NPRR385 for one month. Passed
07/21/2011 PRS To recommend approval of NPRR385 as amended by the 6/21/11 Luminant Energy Company LLC comments. 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: Jun 14, 2011
Sponsor: Luminant Energy Company LLC
Urgent: No
Sections:, 6.1.1,,
Description: This Nodal Protocol Revision Request (NPRR) adds an administrative Settlement Point Price floor of negative $251/MWh.
Reason: As part of the holistic approach towards congestion irresolvable by Security-Constrained Economic Dispatch (SCED), the Congestion Irresolvable by SCED Task Force discussed the impact of Generation Resources on the other side of the constraints, in which ERCOT needs to back down. Those Generation Resources seem to be inequitably harmed as Real-Time Settlement Point Prices can drop to extremely negative values, which are unnecessary to send the proper price signal. This NPRR proposes an administrative price floor for Real-Time Settlement Point Prices of negative $251/MWh, consistent with the Energy Offer Curve offer floor described in Section, Energy Offer Curve Criteria, and the SCED over-generation power balance penalty curve of negative $251/MWh as established in the ERCOT Business Practice document "Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch." The same negative $251/MWh price floor would also be applied to Day-Ahead Settlement Point Prices (DASPPs).

Key Documents

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