1. 02/01/2008 Nodal COMS Extracts & Reports Market Requirements Review SDAWG Jackie Ashbaugh ERCOT ***NOTE: All information contained in this presentation is as of 02/01/2008 and is subject to change at anytime.

2. 2 02/01/2008 Information Hot Spots The Nodal Data Services Master List (NDSML) is updated each Friday with the latest information. It is located at: http://nodal.ercot.com/about/news/2008/0118a.html http://nodal.ercot.com/about/news/2008/0118a.html The site will be updated each Friday with the latest information and draft DDLs going forward. http://nodal.ercot.com/readiness/reports/index.html http://nodal.ercot.com/readiness/reports/index.html The SDAWG meeting pages contain the notes from the SDAWG meetings within the presentation materials. COMS Extract specifications are posted in spreadsheet template form. The latest review is posted at: http://www.ercot.com/calendar/2008/01/20080121-SDAWG.html http://www.ercot.com/calendar/2008/01/20080121-SDAWG.html

3. 3 02/01/2008 COMS Nodal Reports, Extracts & Web Services Dates COMS Project Reports –Project Manager: Raj Chudgar –Business Owners: Jackie Ashbaugh, Bill Barnes - Settlements, Calvin Opheim – Data Aggregation –Milestone dates are not defined –Currently working on business requirements EDW Project Extracts, Reports & Web Services –Project Manager: Janet Ply –Business Owner: Jackie Ashbaugh –Releases for Shadow Settlement Extracts Business Requirements: 02/29/08 Internal project documentation at the report level for support teams - Conceptual Design: 03/15/08 Internal project documentation at the report level for support teams - Detail Design: 04/01/08 ITEST: 05/15/08 EDS: 06/15/08 –Releases for remaining COMS Reports, Extracts & Web Services Business Requirements: 05/15/08 Internal project documentation at the report level for support teams - Conceptual Design: 06/01/08 Internal project documentation at the report level for support teams - Detail Design: 07/01/08 ITEST: 08/01/08 EDS: 09/01/08

4. 4 02/01/2008 Sorted by project EDW project Release for remaining COMS Reports, Extracts & Web Services Extracts CRR Auction Revenue Distribution (CARD) Extract CRR Balancing Account Extract ESI ID Service History & Usage Extract – Daily ESI ID Service History & Usage Extract – Initial ESI ID Service History & Usage Extract – Supplemental Late Fee Extract Market Participant Dispute Extract Recorder Extract – Daily Resource ID Extract - Daily Resource ID Extract - Initial Settlement Calendar Extract Shadow Settlement Extracts –Day Ahead Market Consolidated Operating Day Extract –Day Ahead Market Market Operating Day Extract –Real Time Market Consolidated Operating Day Extract –Real Time Market Operating Day Extract –Public Reference Data Extract –Settlement Input Data Extract Web Services Provide all ESIID extract records Provide CMZONE assignments for a trade date Provide Data Aggregation Records Provide ESIID account records Provide ESIID extract records for Logical Keys Provide ESIIDs where IDR usage data not loaded for a trade date Provide IDR usage data for a trade date Provide public data extract

5. 5 02/01/2008 Sorted by project COMS project Release for COMS Reports Report Default Profile ESIID Load Estimation Counts – Public Load Estimation Counts – Certified Load Estimation Volume – Public Load Estimation Volume – Certified Missing Consumption Report Actual Transmission Loss Factors Actual Distribution Loss Factors Forecasted Transmission Loss Factors Forecasted Distribution Loss Factors Monthly RUC Make Whole Charge and Clawback Payment Report Data Aggregation Daily Postings WS & NWS IDR Proxy Dates IDR Protocol Compliance Verification

6. 6 02/01/2008 Sorted by Zonal/Nodal classification COMS - Zonal Extracts & Reports – will retire Data Aggregation Daily Postings Default Profile ESIID Details of Reliability Must Run Costs Disclosure of Local Congestion - IEQ Disclosure of Local Congestion - INS Generation Extract - Daily Generation Extract - Initial Generation Extract - Trade Date Load Estimation Counts - private Load Estimation Counts - public Load Estimation Volume - private Load Estimation Volume - public Load Extract - Daily Load Extract - Initial Load Extract - Trade Date Market Shadow Prices Extract Missing Consumption Report Resettlement Channel 4 Market Totals Resettlement Channel 5 Market Totals Resettlement Channel 6 Market Totals Resettlement Channel 7 Market Totals Resettlement Channel 8 Market Totals Resettlement Channel 9 Market Totals Settlement & Billing Extract - Daily Settlement & Billing Extract - Initial Settlement & Billing Extract - Trade Date Settlement Calendar Settlement Input Data Extract Settlements Charge Matrix TDSP Distribution Loss Factors - Actual TDSP Distribution Loss Factors - Forecasted TDSP Transmission Loss Factors - Actual TDSP Transmission Loss Factors - Forecasted True-Up Market Totals WS and NWS IDR Proxy Dates Zonal Operational Constraints (OC1) - Daily Zonal Participant Invoice Zonal Settlement Statement

7. 7 02/01/2008 Sorted by Zonal/Nodal classification COMS – Retail & Zonal/Nodal Extracts, Reports & Web Services – no change Extracts –Siebel Service Order - CR (Daily) –Siebel Service Order - CR (Full) –Siebel Service Order - CR (Weekly) –Siebel Service Order - TDSP (Daily) –Siebel Service Order - TDSP (Full) –Siebel Service Order - TDSP (Weekly) –TDSP ESIID extract - Initial –TDSP ESIID extract - Weekly –Auxillary Backcasted Load Profiles (Historical) –Auxillary Backcasted Load Profiles Extract –Backcasted Load Profiles (Historical) –Backcasted Profiles Extract Web Services –Provide ESIID account records –Provide ESIIDs I own for a trade date –Provide ESIIDs where Non-IDR usage data not loaded for a trade date –Provide Non-IDR transaction data for ESIIDs I own –Provide Non-IDR usage data for a trade date –Provide Non-IDR usage data for ESIIDs I own –Find ESIID –Find Transaction Reports –Forecasted Load Profiles –IDR Requirement Report –Load Profile ID Exceptions –Weather Responsiveness Change Report –Switcher Report –867 Received on Cancelled Service Orders (RCSO) Report –867_03 Error Report (867_03 Activity Report) –997 Report –Mapping Status Reject Report –MarkeTrak Bulk Submissions Report –MIMO Exceptions –Missing 867 Report –Pending Cancel with Exception Report –Potential Load Loss Report

8. 8 02/01/2008 Questions?