Title: ORDC OBD Revisions for PUCT Project 48551
Next Group:
Next Step:
Status: Approved on 02/12/2019


Date Gov Body Action Taken Next Steps
02/12/2019 Board of Directors Approved
01/30/2019 TAC Recommended for Approval Board for consideration

Voting Record

Date Gov Body Motion Result
02/12/2019 Board of Directors To approve OBDRR011 as recommended by TAC in the 1/30/19 TAC Report Passed
01/30/2019 TAC To recommend approval of OBDRR011 as revised by 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: 01/22/2019
Sponsor: ERCOT
Urgent: No
Sections: Methodology for Implementing Operating Reserve Demand Curve (ORDC) to Calculate Real-Time Reserve Price Adder
Description: As directed by the Commissioners of the Public Utility Commission of Texas (PUCT) at the PUCT’s January 17, 2019 open meeting, this Other Binding Document Revision Request (OBDRR) modifies the ORDC to achieve a rightward shift in the Loss of Load Probability (LOLP) curve by 0.25 standard deviations in 2019 and another 0.25 standard deviations in 2020. To effectuate this change, this OBDRR revises the methodology for calculating the probability of reserves falling below the minimum contingency level (“PMBCL”) to shift the LOLP by a defined factor “S” multiplied by the standard deviation of the LOLP distribution. This OBDRR proposes to grey-box the change for 2020 until March 1, 2020, consistent with the Commissioners’ directive. With respect to determining the PMBCL and Real-Time Reserve Price Adders, this OBDRR also replaces season and time of day blocks with a blended curve for all seasons and hours, consistent with the Commissioners’ instruction.
Reason: Regulatory requirements

Key Documents