Title: Ancillary Service Offers in the Supplemental Ancillary Services Market
Next Group:
Next Step:
Status: Approved on 04/08/2014
Effective Dates:

All sections except for Section 6.7.2


Section 6.7.2


Date Gov Body Action Taken Next Steps
04/08/2014 BOARD Approved
03/27/2014 TAC Recommended for Approval ERCOT Board for consideration.
03/18/2014 PRS Recommended for Approval TAC for consideration.
02/13/2014 PRS Recommended for Approval PRS Impact Analysis review
01/16/2014 PRS Deferred/Tabled PRS language consideration

Voting Record

Date Gov Body Motion Result
04/08/2014 BOARD To approve NPRR589 as recommended by TAC in the 3/27/14 TAC Report. Passed
03/27/2014 TAC To recommend approval of NPRR589 as recommended by PRS in the 3/18/14 PRS Report. Passed
03/18/2014 PRS To endorse and forward the 2/13/14 PRS Report and Impact Analysis for NPRR589 to TAC with a recommended priority of 2014 and rank of 1220. Passed
02/13/2014 PRS To recommend approval of NPRR589 as amended by the 2/7/14 QMWG comments. Passed
01/16/2014 PRS To table NPRR589. 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: Dec 30, 2013
Sponsor: QMWG
Urgent: No
Sections:,,,, 6.7.2
Description: This Nodal Protocol Revision Request (NPRR) adds language to the Supplemental Ancillary Services Market (SASM) timeline to allow Qualified Scheduling Entities (QSEs) to submit Ancillary Service Offers after notification of the need to run a SASM.
Reason: ERCOT has observed several instances since Nodal go-live of insufficient quantities of Ancillary Service Offers available to clear a SASM in Real-Time. In these instances, ERCOT’s alternative to purchasing required Ancillary Services through a competitive market clearing process is to order a Resource On-Line through the Reliability Unit Commitment (RUC) process. This results in a non-market solution that would be expected to be less efficient than a competitive market clearing process for the ERCOT market. The reason more offers have not been available to SASMs is due to the need to update offers to reflect changing conditions in Real-Time. As currently designed, SASM Ancillary Service procurement only considers offers that were in the system prior to notification of the SASM. This requires QSEs to leave offers in continually or update them every hour to reflect the actual cost of the Ancillary Service as system conditions and market conditions change in Real-Time. By allowing QSEs to submit offers after notification of a SASM, more offers will be available because of the reduced risk of having stale offers in the Market Management System (MMS).

Key Documents

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