NOTICE DATE: November 2, 2023

NOTICE TYPE: M-C102323-02 General

SHORT DESCRIPTION: Dashboards affected by end of Daylight Saving Time (DST) November 4 - 6, 2023

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: November 4 - 6, 2023

LONG DESCRIPTION: Some of ERCOT’s informational dashboards on the Grid and Market Conditions page of ERCOT.com will be affected by the end of Daylight Saving Time (DST) occurring on Sunday, November 5, 2023.

• An extra hour (indicated as 01*) will appear on the x-axis of many of the dashboards on Sunday, November 5, to indicate the additional hour of time gained by the DST change.
• The presentation of the DC Tie Flows and Combined Wind and Solar dashboards may be distorted briefly during the early hours of Sunday, November 5.
• To better support DST data, some JSON structures have changed, which could affect scripts being used.
• Day-Ahead values provided on Saturday, November 4 may be affected.
• Previous Day values provided on Monday, November 6 may be affected.

ACTION REQUIRED: Users should be aware of possible errors on these dashboards from Saturday, November 4 through Monday, November 6.

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 ClientServices@ercot.com.

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dg