NOTICE DATE: September 28, 2026
NOTICE TYPE: M-E092826-01 Operations
SHORT DESCRIPTION: ERCOT MOTE will be open for DST testing
INTENDED AUDIENCE: All Market Participants
DAYS AFFECTED: October 5, 2026 - October 9, 2026
LONG DESCRIPTION: The ERCOT Market Operations Test Environment (MOTE) will be available for Market Participant Daylight Saving Time (DST) testing as listed in the table below. There is only one period for testing this year. The testing period will be from Monday through Friday and will follow the simulated times shown in the table.
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Real Time
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Simulated Time
|
MOTE System
|
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Mon 10/5/2026 2 PM
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Fri 10/30/2026 2 AM CDT
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MOTE Servers Normal Time change to DST Time
|
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Mon 10/5/2026 5 PM
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Fri 10/30/2026 5 AM CDT
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Start testing QSE submissions for next 5 days including Long Day 11/1/2026
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Mon 10/5/2026 10 PM
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Fri 10/30/2026 10 AM CDT
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DAM close for Operating Day 10/31/2026
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|
Tue 10/6/2026 10 PM
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Sat 10/31/2026 10 AM CDT
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DAM close for Operating Day 11/1/2026 (Long DST Day)
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|
Wed 10/7/2026 1 PM
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Sun 11/1/2026 1 AM CDT
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CDT Time
|
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Wed 10/7/2026 2 PM
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Sun 11/1/2026 1* AM
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DST Transition Time/Repeated Hour
|
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Wed 10/7/2026 3 PM
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Sun 11/1/2026 2 AM CST
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End of Repeated hour - CST
|
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Wed 10/7/2026 11 PM
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Sun 11/1/2026 10 AM CST
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DAM close for Operating Day 11/2/2026
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|
Fri 10/9/2026 2 PM
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Tue 11/3/2026 9 PM CST
|
Close of Test and MOTE Servers DST Time Change to Normal Time
|
ACTION REQUIRED: MPs requested to participate in market and outage submission testing leading up to the DST transition and ensure no issues observed during and after the transition.
ADDITIONAL INFORMATION: For information regarding submissions, including DST requirements, please refer to the latest version of EIP external specifications documentation and the most recent External Web Services XSDs located on the ERCOT developer portal (https://developer.ercot.com/).
For MOTE testing, the URL for XML submissions is: https://testmisapi.ercot.com/NodalAPI/EWS/
The URL for UI submissions is: https://testmis.ercot.com/mmsui/mmsui/displayTradesLanding.action
The following are examples of how the Long DST Day November 01, 2026 will be labeled:
0100
0200 (Normal Hour)
0200* (Repeated Hour)
0300
0400
0500
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.
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: http://lists.ercot.com.
dg