NOTICE DATE: May 28, 2010

NOTICE TYPE: M-A052810-03 UPDATE

SHORT DESCRIPTION: ERCOT will be taking a fifteen (15) minute outage at 15:25 today, May 28, 2010, to correct an issue with the Retail API.

INTENDED AUDIENCE: All Market Participants

DAY AFFECTED: May 28, 2010

LONG DESCRIPTION: ERCOT will be taking a fifteen (15) minute outage at 15:25 today, May 28, 2010, to correct an issue with the Retail API.

The outage will impact all market participants that are retrieving information from the extract repository. Market participants will not be able to retrieve extracts with the API or the Texas Market Link Report Explorer.

ADDITIONAL INFORMATION: All market participants that are using the API for the Market database will not be impacted.

A completion notice will be sent upon conclusion of the outage.

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 e-mail at [log in to unmask].

If you are receiving e-mail 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.

JR/DP

From: ERCOT Client Relations
Sent: Friday, May 28, 2010 11:39 AM
To: [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]
Cc: [log in to unmask]; [log in to unmask]; [log in to unmask]; 1 ERCOT Client Service Reps
Subject: M-A052810-02 UPDATE - API Outage

NOTICE DATE: May 28, 2010

NOTICE TYPE: M-A052810-02 UPDATE

SHORT DESCRIPTION: The planned ERCOT fifteen (15) minute outage today, May 28, 2010, to correct an issue with the Retail API has been rescheduled for later today.

INTENDED AUDIENCE: All Market Participants

DAY AFFECTED: May 28, 2010

LONG DESCRIPTION: The planned ERCOT fifteen (15) minute outage today, May 28, 2010, to correct an issue with the Retail API has been rescheduled for later today.

ADDITIONAL INFORMATION: The newly scheduled time will be provided as soon as it is determined.

If you are receiving e-mail 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.

JR/DP

From: ERCOT Client Relations
Sent: Friday, May 28, 2010 10:11 AM
To: [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]
Cc: [log in to unmask]; [log in to unmask]; [log in to unmask]; 1 ERCOT Client Service Reps
Subject: M-A052810-01 - API Outage

NOTICE DATE: May 28, 2010

NOTICE TYPE: M-A052810-01

SHORT DESCRIPTION: ERCOT will be taking a fifteen (15) minute outage at 12:00 (noon) today, May 28, 2010, to correct an issue with the Retail API.

INTENDED AUDIENCE: All Market Participants

DAY AFFECTED: May 28, 2010 from 12:00 – 12:15

LONG DESCRIPTION: ERCOT will be taking a fifteen (15) minute outage at noon today, May 28, 2010, to correct an issue with the Retail API.

ADDITIONAL INFORMATION: All market participants that are using the API for the Market database will not be impacted.

If you are receiving e-mail 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.

JR/DP