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NOTICE DATE:  April 20, 2017

NOTICE TYPE:  M-B042017-01 Outage - Retail/Wholesale

SHORT DESCRIPTION:  Planned system maintenance with impacted services

INTENDED AUDIENCE:  ERCOT Market Participants

DAY(S) AFFECTED:  April 25, 2017 16:30 - 20:30, April 27, 2017 9:30 - 14:00, and April 27, 2017 16:00 - 18:00

LONG DESCRIPTION:  ERCOT will be performing planned system maintenance of several databases and applications on April 25 and April 27, 2017.

During the April 25, 2017 16:30 - 20:30 outage window, Market Participants may experience intermittent issues with the following services:

********* MPIM

********* The following ERCOT internet services:

o   Texas Renewables - www.texasrenewables.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.texasrenewables.com_&d=DwIFAg&c=trp9rTvIdyEWh1VWB5x8_2JiPaB5oGZOtWPDws2_VoY&r=nfPtykJirh6zkdj_SUrDhWk1u9ovsm1QJE50kwBFuP37cvRuStOq93TVB47vcl5Q&m=tQIDTOrH72Yy7RDHHJft3rZrBD5gnfWdQfeAwwC4tE4&s=znzYxnm--GhK8RRJdNnHm4LUw6jv1M4Qh-vaklhUUVs&e= >

o   Retail Testing Website - etod.ercot.com<https://etod.ercot.com/>

********* Market Data Transparency (MDT) Web Services

********* Extract Subscriber

********* Net Dependable Capability and Reactive Capability (NDCRC)

During the April 27, 2017 9:30 - 14:00 outage window, Market Participants may experience intermittent issues with the following services:

********* Report publishing to the ERCOT Market Information System (MIS)

********* Find ESIID

During the April 27, 2017 16:00 - 18:00 outage window, Market Participants may experience intermittent issues with the following services:

********* Market submissions and requests via WebServices, Market Manager and Outage Scheduler

********* Report publishing to the ERCOT MIS

********* Downloading of extracts and reports from the MIS and WebServices

********* Net Dependable Capability and Reactive Capability (NDCRC)

********* Congestion Revenue Right (CRR) Market User Interface

During this outage window, please use the following URLs to directly access the Market Manager and Outage Scheduler:

   *    https://mis.ercot.com/mmsui/mmsui/displayTradesLanding.action
   *    https://mis.ercot.com/osrui/osrui/Summary.action

   Note that the outage start times may be delayed depending on the current system conditions.

   ADDITIONAL INFORMATION:  Reports will be rerun and reposted as applicable. The MIS Dashboards and ERCOT.com price displays will not be populated with data during the April 27, 2017 16:00 - 18:00 timeframe.

   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]<mailto:[log in to unmask]>.

   If you are receiving email from an 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.









   sa




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