NOTICE DATE: August 12, 2021

NOTICE TYPE: W-A081221-01 - Operations

SHORT DESCRIPTION: Adjustment to minimum Monthly Ancillary Service Requirements for September through December 2021

INTENDED AUDIENCE: ERCOT Market Participants

DAYS AFFECTED: September 1, 2021 through December 31, 2021

LONG DESCRIPTION: On September 1, 2021, ERCOT will increase the minimum quantities of Responsive Reserve (RRS) service and Non-Spinning Reserve (Non-Spin) service to be procured between September 1, 2021 and December 31, 2021.  RRS quantities for Hour Ending (HE) 14 through 21 in September and October will be increased to 2800 MW. The increases in Non-Spin quantities for September 1, 2021 through December 31, 2021 vary by hour and month and range from 2,638 MW to 4,041 MW. 

The Ancillary Service Requirement Methodology document posted on the Market Information System (MIS) Secure site has been updated to show the specific adjustments and the revised total minimum Ancillary Service quantities. A digital certificate is required to access the MIS Secure site. The posted Ancillary Services quantities reflect minimum requirements only.  ERCOT will follow-up with a notification if any upward adjustments to these minimum quantities are made. 

The basis for this increase was discussed at the July 28, 2021 Technical Advisory Committee (TAC) meeting. The presentation for that meeting is posted on the TAC meeting page on the ERCOT website. Note that Non-Spin requirements for Operating Hours with an increased potential of high forecast variability will be posted two days in advance of the Operating Day in the DAM Ancillary Service Plan report, which is publicly available on the MIS. 

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 [log in to unmask].

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