NOTICE DATE: September 30, 2008 NOTICE TYPE: M-A093008-01 - Informational CLASSIFICATION: Public SHORT DESCRIPTION: ERCOT process for Duns & Bradstreet (DUNS) Numbers INTENDED AUDIENCE: All Market Participants LONG DESCRIPTION: In support of ERCOT's Nodal transition, several changes are being made to the ERCOT registration system. One of these changes is the standardization of numbers used to set up new Market Participants in ERCOT's registration system. Standardized four-digit extensions are being added to the root DUNS Number of all newly registered Market Participants so that the registration type can be more easily identified and to allow for the unique identification of multiple registration types by a Market Participant. The standard nine-digit DUNS Number will continue to be used as the identification of the Registered Market Participant for credit purposes. The four-digit extensions are being assigned as follows: Entity Type : DUNS Extension: Load Serving Entity (LSE) 1000 Series Qualified Scheduling Entity (QSE) 2000 Series Resource Entity (RE) 3000 Series Transmission Distribution Service Provider (TDSP) 4000 Series Congestion Revenue Rights Account Holder (CRR) 5000 Series ADDITIONAL INFORMATION: Existing Market Participants that are already registered with ERCOT will not be impacted by this change. These Market Participants will retain their existing ERCOT DUNS Number. 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 <http://lists.ercot.com/> . JA/SH