NOTICE DATE: September 21, 2021

NOTICE TYPE: M-A092121-01 Operations

SHORT DESCRIPTION: ERCOT MOTE will be open for DST testing

INTENDED AUDIENCE: QSE operations personnel

DAYS AFFECTED: September 24, 2021 through October 4, 2021

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.  Note that there is 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.


Simulated time

MOTE system

9/24/2021 02:00 PM

11/2/2021 02:00 AM

MOTE Servers Normal Time change to DST Time

9/27/2021 05:00 PM

11/5/2021 05:00 AM

Start testing QSE submissions for next 5 days including Long Day 11/7/2021

9/27/2021 10:00 PM

11/5/2021 10:00 AM

DAM close for Operating Day 11/6/2021

9/28/2021 10:00 PM

11/6/2021 10:00 AM

DAM close for Operating Day 11/07/2021 (Long DST Day)

9/29/2021 02:00 PM

11/7/2021 02:00 AM

DST Transition Time

9/29/2021 03:00 PM

11/7/2021 02:00* AM

DST Repeated Hour

9/29/2021 11:00 PM

11/7/2021 10:00 AM

DAM close for Operating Day 11/8/2021

10/1/2021 02:00 PM

11/9/2021 01:00 AM

Close of MOTE Test

10/4/2021 10:00 AM

11/12/2021 10:00 PM

MOTE Servers DST Time Change to Normal Time


ADDITIONAL INFORMATION: For information regarding submissions, including Daylight Saving Time requirements, please refer to the latest version of the EIP External Interface Specifications document for use of the External Web Services (EWS) found in the Wholesale section of the XSDs webpage. The most recent External Web Services XSD may also be found in the same location.

During testing, the URL for XML submissions will be:

The URL for UI submissions will be:

The following are examples of how the Long DST Day November 7, 2021 are labeled:


0200 (Normal Hour)

0200* (Repeated Hour)




The MOTE MPIM application will be unavailable for the duration of the DST testing.

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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