Title: Remove Ancillary Service Offers from SASM that do not Meet the Lead Time
Next Group:
Next Step:
Status: Approved on 04/19/2011
Effective Dates:


Date Gov Body Action Taken Next Steps
04/19/2011 BOARD Approved
04/07/2011 TAC Recommended for Approval ERCOT Board consideration of NPRR341
03/24/2011 PRS Recommended for Approval TAC consideration of NPRR341

Voting Record

Date Gov Body Motion Result
04/19/2011 BOARD To approve NPRR341 as recommended by TAC in the 4/7/11 TAC Report. Passed
04/07/2011 TAC To recommend approval of NPRR341 as recommended by PRS in the 3/24/11 PRS Report. Passed
03/24/2011 PRS To recommend approval of NPRR341 as submitted, to recommend a priority of High and a rank of 9.5, and to forward NPRR341 to TAC. 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: Mar 23, 2011
Sponsor: ERCOT
Urgent: Yes
Description: This Nodal Protocol Revision Request (NPRR) proposes to modify input data processing of Supplemental Ancillary Services Markets (SASMs) to remove offers that do not meet the lead time for each hour in the SASM study period.
Reason: To prevent a Resource from getting committed before the lead time is met, Market Participants would like to add an hourly expiration time to Ancillary Service Offers. This NPRR is being submitted to suggest an alternative solution because the system changes needed to implement the hourly expiration time for Ancillary Service Offers is too extensive. The solution suggested in this NPRR attains the same objective as putting the hourly expiration time in Ancillary Service Offers and at the same time is much simpler to implement. Currently SASM does not look at temporal constraints when awarding offers. The system needs to be modified to not award Off-Line Resources in SASM before meeting the lead time. This will be done by removing offers for each hour in the study period that do not meet the lead time before running SASM. Such offers are from Off-Line Resources for which the current time plus the lead time (based on the warmth state and the historical commitment status) is greater than or equal to the study hour. If the lead time cannot be met for the first hour of a block offer, then the whole block offer is cancelled.

Key Documents

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