NOTICE DATE: May 4, 2017

NOTICE TYPE: M-A050417-01 Unplanned Outage

SHORT DESCRIPTION: Unplanned Outage - MIS

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: May 4, 2017

LONG DESCRIPTION: ERCOT experienced an issue that affected the Market Information System (MIS) on May 4, 2017 from 09:29 AM to 10:34 AM. All services available through the MIS were intermittently unavailable during the noted time frame, including the following:

· Market submissions and requests via External Web Services (EWS), Market Manager and Outage Scheduler

· Downloading of extracts and reports from the MIS and External Web Services (EWS)

· Net Dependable Capability and Reactive Capability (NDCRC)

· Congestion Revenue Right (CRR) Market User Interface

· Find ESIID and Find Transaction

· MPIM

· Market Data Transparency (MDT) Web Services

· Extract Subscriber

· eService

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].

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.