NOTICE DATE: March 22, 2022

NOTICE TYPE: M-A021722-03 Release

SHORT DESCRIPTION: Update - MOTE testing start delayed for the MMSUI and OSUI applications with Chrome or Edge Browsers

INTENDED AUDIENCE: Qualified Scheduling Entities (QSEs) and Transmission Service Providers (TSPs)

EFFECTIVE DATE: March 25, 2022 until April 1, 2022

LONG DESCRIPTION: UPDATE - The Market Operations Test Environment (MOTE) testing has been delayed while ERCOT development resolves an issue within the Market Management system (MMS) User Interface (UI) and Outage Scheduler (OS) UI applications. MOTE will now be available for testing starting March 25, 2022 until April 1, 2022.

This notice offers Market Participants the opportunity to voluntarily test the MMSUI and OSUI applications with Chrome or Edge browsers in the MOTE environment starting March 25, 2022 until April 1, 2022.

Microsoft is ending support of all Internet Explorer (IE) browsers in June 2022. ERCOT is in the process of ensuring all Market-facing applications support Chromium browser platforms (Microsoft Edge and Google Chrome). In accordance with this plan, ERCOT will release the Chromium-based version of MMSUI (Market Management System User Interface) and OSUI (Outage Scheduler User Interface) on April 07, 2022. After April 07, 2022, only Microsoft Edge and Google Chrome browsers will be supported by the MMSUI and OSUI applications. It should be noted that users will be able to open only one MMSUI or OSUI browser session at a time in Google Chrome or Edge.

ACTION REQUIRED: Starting March 25, 2022 until April 1, 2022, Market Participants may voluntarily test the MMSUI application in the MOTE environment with Chrome or Edge browsers.

ADDITIONAL INFORMATION: ERCOT designates the supported browser for each of its applications on the Applications page of ERCOT.com. Click the purple Help button at the bottom right of the page to view this information.

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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