Changes to SSO Extract:  Based on DEWG discussions in 2005, ERCOT is recommending the following changes to the SSOE: In lieu of the current daily files and weekly re-baselines, the following extracts will be able to be scheduled by Market Participants (see details on next slide):  Initial  Monthly  Daily  With the market release of the extract, the SSOE will become a scheduled extract. This means the extract will not automatically be provided to current MPs.  MPs must chose to SCHEDULE the extract if they want to receive it on a daily basis. Ability to un-schedule will also be available.  Extracts that are scheduled will be delivered the following day.  ERCOT Implementation Date: January 18, 2007  Market Implementation Date: Monday, February 20, 2007 Changes to SSO Extract:  Based on DEWG discussions in 2005, ERCOT is recommending the following changes to the SSOE: In lieu of the current daily files and weekly re-baselines, the following extracts will be able to be scheduled by Market Participants (see details on next slide):  Initial  Monthly  Daily  With the market release of the extract, the SSOE will become a scheduled extract. This means the extract will not automatically be provided to current MPs.  MPs must chose to SCHEDULE the extract if they want to receive it on a daily basis. Ability to un-schedule will also be available.  Extracts that are scheduled will be delivered the following day.  ERCOT Implementation Date: January 18, 2007  Market Implementation Date: Monday, February 20, 2007 Siebel Service Order Extract / TDSP ESIID Report PR EDW Siebel Transition As of September 20, 2006Page 1

Scheduled Extract Options:  Initial – ERCOT can provide an Ad-Hoc initial Extract. This “FULL” may be requested once per quarter. ERCOT recommends also scheduling the daily extract if this option is chosen.  Monthly – Also an Ad-Hoc Extract, this option includes data with addtimes for the previous twelve months and may be requested once per month.  Daily – Consistent with the current daily Extract, this option provides data from the previous day. The reporting period would display net changes from 00:00: :59:59 of the prior day. Scheduled Extract Options:  Initial – ERCOT can provide an Ad-Hoc initial Extract. This “FULL” may be requested once per quarter. ERCOT recommends also scheduling the daily extract if this option is chosen.  Monthly – Also an Ad-Hoc Extract, this option includes data with addtimes for the previous twelve months and may be requested once per month.  Daily – Consistent with the current daily Extract, this option provides data from the previous day. The reporting period would display net changes from 00:00: :59:59 of the prior day. Siebel Service Order Extract PR EDW Siebel Transition As of September 20, 2006 Page 2

PR EDW Siebel Transition Siebel Service Order Extract Questions Received:  Why was the option for a weekly report removed?  Cost and Usage statistics  Refer to slides from August 2005 DEWG presentation by C. Lane  Combination of then identified and recommended options 2 & 3  Why can’t we have an option to produce a report with everything not yet completed?  Not the sole reason behind/requirement of the current SSOE  As this is not a current report, to do this would require an SCR  Potential future Web Services Request Questions Received:  Why was the option for a weekly report removed?  Cost and Usage statistics  Refer to slides from August 2005 DEWG presentation by C. Lane  Combination of then identified and recommended options 2 & 3  Why can’t we have an option to produce a report with everything not yet completed?  Not the sole reason behind/requirement of the current SSOE  As this is not a current report, to do this would require an SCR  Potential future Web Services Request As of September 20, 2006 Page 3

 Currently being updated in PR Enhance ESIID Lookup Functionality to add Lodestar ESIID characteristics and open Siebel Service Order data  PR will move extract to be produced out of the Siebel and Lodestar ODS  DDL will be updated with PR to include a field for the POLR Customer Class that will be populated with PR TX Set 3.0 implementation  Currently being updated in PR Enhance ESIID Lookup Functionality to add Lodestar ESIID characteristics and open Siebel Service Order data  PR will move extract to be produced out of the Siebel and Lodestar ODS  DDL will be updated with PR to include a field for the POLR Customer Class that will be populated with PR TX Set 3.0 implementation TDSP ESIID Report PR EDW Siebel Transition As of September 20, 2006 Page 4

Discontinuation of Darkside Report:  ERCOT will be discontinuing the Darkside Report due to low usage and reporting validity.  The Darkside Report was never implemented completely to display the “Darkside” reporting (complete transaction lifecycle) and usage on the report is extremely low. Should a need for the data be identified, DEWG will need to sponsor an SCR.  ERCOT is currently looking for information from any Market Participant utilizing this report to determine the need for the data and if such data is available elsewhere.  ERCOT is scheduled to discontinue the Darkside Reports December 2, 2006 in association with PR_ RBP. Discontinuation of Darkside Report:  ERCOT will be discontinuing the Darkside Report due to low usage and reporting validity.  The Darkside Report was never implemented completely to display the “Darkside” reporting (complete transaction lifecycle) and usage on the report is extremely low. Should a need for the data be identified, DEWG will need to sponsor an SCR.  ERCOT is currently looking for information from any Market Participant utilizing this report to determine the need for the data and if such data is available elsewhere.  ERCOT is scheduled to discontinue the Darkside Reports December 2, 2006 in association with PR_ RBP. Market Participant Transaction Report (aka Darkside) Discontinuation of MP Transaction Report As of September 20, 2006 Page 6

Process for Discontinuation of Reports/Extracts:  ERCOT monitors usage statistics to identify reports/extracts with low volume of usage.  ERCOT works with DEWG to review the statistics to make determination of discontinuation of report/extract. This information is then updated at COPS.  ERCOT and DEWG assess value of data and determine if it is available elsewhere.  ERCOT reaches out to Market Participants utilizing reports to determine the need for the information. (**Currently where we are for the Darkside Report)  ERCOT sends notification to the Market for discontinuing the report/extract.  25 Day advance notice  Reminder the week of  Follow up notice once report/extract has been discontinued (optional)  Should a later need for the data be determined, DEWG will need to sponsor an SCR. Process for Discontinuation of Reports/Extracts:  ERCOT monitors usage statistics to identify reports/extracts with low volume of usage.  ERCOT works with DEWG to review the statistics to make determination of discontinuation of report/extract. This information is then updated at COPS.  ERCOT and DEWG assess value of data and determine if it is available elsewhere.  ERCOT reaches out to Market Participants utilizing reports to determine the need for the information. (**Currently where we are for the Darkside Report)  ERCOT sends notification to the Market for discontinuing the report/extract.  25 Day advance notice  Reminder the week of  Follow up notice once report/extract has been discontinued (optional)  Should a later need for the data be determined, DEWG will need to sponsor an SCR. Discontinuation of MP Transaction Report As of September 20, 2006 Page 7 Market Participant Transaction Report (aka Darkside)