Legal Notifications; Operations; Settlements

Tue, Mar 30, 2021 12:14 PM

M-A033021-01 Implementation of PUCT order directing ERCOT to apply failure-to-provide Settlement treatment to QSEs that failed on Ancillary Service Supply Responsibilities

NOTICE DATE: March 30, 2021

NOTICE TYPE: M-A033021-01 Legal

SHORT DESCRIPTION: Implementation of PUCT order directing ERCOT to apply failure-to-provide Settlement treatment to QSEs that failed on Ancillary Service Supply Responsibilities

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: Operating Days (ODs) February 14, 2021 through February 19, 2021

LONG DESCRIPTION: On March 12, 2021, the Public Utility Commission of Texas (PUCT) issued an order in project 51812 directing ERCOT to “settle each qualified scheduling entity that failed on its ancillary service supply responsibility in accordance with ERCOT Nodal Protocol section, entitled Replacement of Ancillary Service Due to Failure to Provide, for a particular ancillary service for any hour of ERCOT's operating days February 14, 2021 through February 19, 2021”. Protocol Section (1) states that “a QSE is considered to have failed on its Ancillary Services Supply Responsibility when ERCOT determines, in its sole discretion, that some or all of the QSE’s Resource-specific Ancillary Service capacity will not be available in Real-Time.”

To determine unavailable Ancillary Service capacity for the ODs at issue, ERCOT will compare each Qualified Scheduling Entity’s (QSE’s) Real-Time Ancillary Service Supply Responsibility per Protocol Section, Ancillary Service Supply Responsibility, during the applicable Operating Hour on the OD at issue, to the QSE’s average Real-Time telemetered Ancillary Service Responsibility for the Operating Hour across its portfolio. Paragraph (1) of Protocol Section, Ancillary Service Qualification and Testing, states, “Each QSE for the Resources that it represents may only provide Ancillary Services on those Resources for which it has met the qualification criteria.” Therefore, ERCOT will exclude any telemetered Ancillary Service Responsibility that a Resource was not qualified to provide on the ODs at issue. ERCOT will also exclude telemetered Ancillary Service Responsibility where a Resource had a telemetered Resource Status indicating inability to provide the applicable Ancillary Service on the ODs at issue. Finally, ERCOT will use a minimum threshold of 1 MWh per OD, per Ancillary Service product in determining failed quantities.

Failure to provide quantities will affect the following Settlements:

  • Protocol Section 6.7.3, Charges for Ancillary Service Capacity Replaced Due to Failure to Provide
    • Each QSE will be charged for a failed quantity based on the quantity multiplied by the maximum of Day-Ahead Market (DAM) or Supplemental Ancillary Service Market (SASM) Market Clearing Price for Capacity (MCPC) for the applicable Ancillary Service product.
    • Only one OD at issue had a SASM (February 19, 2021); therefore DAM MCPCs and SASM MCPCs will be considered for that OD.
  • Protocol Section 6.7.4, Adjustments to Cost Allocations for Ancillary Services Procurement
    • The failed quantity reduces the allocation of procured Ancillary Services by product.
  • Protocol Section 6.7.5, Real-Time Ancillary Service Imbalance Payment or Charge
    • The Real- Time Ancillary Services Responsibility (RTASRESP) per QSE will be reduced by the failed quantity for all products.

Failure-to-provide Settlement treatment for the ODs at issue will be applied to Final Settlement, as follows:

Operating Day

Final Settlement














Failed quantity values will also be available in QSE Settlement extracts for the associated final OD.

CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at

If you are receiving email from a public ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: