NOTICE DATE: February 28, 2008

NOTICE TYPE: M-A021308-02 UPDATE - Informational

CLASSIFICATION: Public

SHORT DESCRIPTION: The Market Participant Identity Management (MPIM) system implementation has been delayed.

INTENDED AUDIENCE: Market Participant USAs and Backup USAs

LONG DESCRIPTION: The new functionality for Market Participant USAs to manage Digital Certificate users and manage user access via the Market Participant Identity Management (MPIM) system has been delayed. The MPIM project implementation timeline will be revised. Additional information and updated timelines will be communicated as they become available.

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].

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JA/TR

From: ERCOT Client Relations
Sent: Wednesday, February 13, 2008 9:26 AM
To: '[log in to unmask]'
Cc: [log in to unmask]; [log in to unmask]; [log in to unmask]; 1 ERCOT Client Service Reps
Subject: M-A021308-01 – Informational - MPIM Implementation - USA user access

NOTICE DATE: February 13, 2008

NOTICE TYPE: M-A021308-01 – Informational

CLASSIFICATION: Public

SHORT DESCRIPTION: ERCOT has scheduled an outage impacting the Texas Market Link (TML) User Security Administrator (USA) User Access functionality beginning 5:00 PM Friday, March 7, 2008 through 11:59 PM Sunday, March 9, 2008.

INTENDED AUDIENCE: Market Participant USAs and Backup USAs

DAYS AFFECTED: 5:00 PM Friday, March 7, 2008 through 11:59 PM Sunday, March 9, 2008

LONG DESCRIPTION: New functionality for Market Participant USAs to manage Digital Certificate users and manage user access via the Market Participant Identity Management (MPIM) system will be deployed on Saturday, March 8, 2008. As part of the MPIM project implementation, ERCOT has scheduled an outage of the USA User Access functionality in TML beginning Friday, March 7, 2008 at 5:00 PM. The outage will impact all User Access activities:

No Market Participant USA or user certificates can be created or updated
No certificates can be renewed
No certificate requests will be approved
No certificates can be picked up
No certificates can be revoked

After 5:00 PM Friday, March 7, 2008 the TML USA User Access functionality will no longer be available. Beginning Monday, March 10, 2008 Market Participant USAs will begin using the MPIM system to manage users and manage user access.

Additional information regarding user guides and training opportunities will be provided as it becomes available.

ACTION REQUIRED: If Market Participants have Digital Certificates that will expire during the March 3^rd through the 14^th timeframe, they should re-issue those certificates at least ten (10) days in advance.

The renew user function will be disabled for twelve (12) months following the MPIM implementation. USAs will be required to issue all new Digital Certificates via the MPIM system.

ADDITIONAL INFORMATION: As of 5:00 PM Friday, March 7, 2008 all certificates previously issued within the Market Operating Testing Environment (MOTE) will be decommissioned. Prior to the implementation of the MPIM system, ERCOT will re-issue one MOTE certificate to each appropriate entity. This certificate will be issued to the existing USA or Primary Contact listed in ERCOT’s Registration application.

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JA/SH