Antitrust Admonition

Ancillary Service Methodology Discussion

Overview of Updates Related to ESR Operations in QSE Operations During the Operating Hour Business Practice Manual

Presentation on ECL#45

• The Impact of Frequency Oscillation and Low Frequency on Generator Operation

Review Emergency Conditions list from ROS

• Focus discussion and revisions on the PDCWG action items from the Emergency Conditions List.

• Future PDCWG discussion with GE regarding generator operations at frequencies between 59.3 Hz and 59.4 Hz, and discussion of combined cycle generators being frequency responsive while base loaded.

• Defining high/med/low forecast variability for A/S.

ROS has asked PDCWG to respond to:

• "Assess impact of A/S changes over summer and report to TAC"

• "Analyze methodology for determining non-spin reqs and value provided in non-peak times; possible decrease non-spin when risk is lower?"

• "Do these topics beg the question of whether PDCWG should have A/S analysis tools?"

Break

ERCOT Frequency Control Metrics and Regulation Reports

ERCOT Analysis of Disturbances / Frequency Events:

Non-FMEs

• 9/3/2021 2:49:15

• 9/9/2021 17:11:20

• 9/22/2021 9:15:10

FMEs

• 9/12/2021 23:17:44

• 9/25/2021 15:39:15

Texas RE Report

Upcoming ERCOT / Texas RE Workshops / Meetings

• Texas RE Fall Workshop October 14, 2021

• ERCOT Non-Spinning Reserve Service October 14, 2021

• 2021 ERCOT Winter Weather Preparedness Workshop November 2, 2021

CLOSED SESSION