NOTICE DATE: July 23, 2021
NOTICE TYPE: M-B071321-02 Settlements
SHORT DESCRIPTION: Real-Time Market Resettlements for Operating Days February 17-19, 2021
INTENDED AUDIENCE: QSE Settlement Personnel
DAY AFFECTED: February 17-19, 2021
LONG DESCRIPTION: On July 13, 2021, ERCOT informed Market Participants that ERCOT granted certain Settlement disputes, which will require the issuance of Real-Time Market (RTM) Resettlement Statements for Operating Days (ODs) February 17, 2021 to February 19, 2021. See Market Notice M-B071321-01. Because these resettlements involve ODs related to the February 2021 extreme winter weather event, ERCOT is providing additional details regarding the granted Settlement disputes. The resettlements noted herein involve four Settlement disputes and two Qualified Scheduling Entities (QSEs).
Settlement Dispute 1: Base Point Deviation Charge (BPDAMT)
ERCOT issued a Verbal Dispatch Instruction (VDI) directing the QSE to hold a Resource’s output at a specific level. The QSE received SCED Base Points (BPs) to increase the Resource’s output at a level higher than instructed by the VDIs. The QSE complied with the VDIs and did not follow the SCED BPs, which resulted in a BP deviation charge. ERCOT determined that the BP deviation charge was in error. The RTM Resettlement Statement will include the instructed output level per the VDI, which will lower the under- generation (UGEN) quantity and reduce the BPDAMT.
Settlement Disputes 2 & 3: Real-Time Ancillary Service Imbalance (RTASIAMT) & Real-Time Reliability Deployment Ancillary Service Imbalance (RTRDASIAMT)
In each case, ERCOT issued a VDI directing the QSE to telemeter a High Sustained Limit (HSL) that was lower than the Resource’s HSL at that time. The QSE’s compliance with the VDI reduced the amount of its Real-Time Online Reserve Capacity (RTOLCAP), which in turn affected the QSE’s calculated RTASIAMT and RTRDASIAMT values. ERCOT determined that the RTASIAMT and RTRDASIAMT values were in error to the extent the RTOLCAP did not account for the capacity between the instructed level of output and the Resource’s HSL. The RTM Resettlement Statement will include a revised RTOLCAP based on the actual HSL for each Resource. In addition, the RTOLCAP will be further revised based on the UGEN quantity calculated per the BPDAMT resettlement noted above.
Settlement Dispute 4: Responsive Reserve Failure Quantity Amount (RRFQAMTQSETOT)
In order to fulfill the QSE’s Ancillary Service (AS) obligation, the QSE purchased its obligated MW quantity via an AS trade. The QSE communicated the trade to ERCOT, and the QSE for the Resource telemetered the obligation, but the QSE was not credited for the AS trade in the Initial Statement. The QSE was charged for failure to provide. ERCOT determined the charge was in error. The resettlement will correct the RRFQAMTQSETOT amount and reverse the charge.
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