1. COMMERCIAL OPERATIONS ORGANIZATION Betty Day Director, Commercial Operations bday@ercot.com 512-248-3877(office) 512-426-9266(cell) 512-248-6434(fax)

2. 2 9/4/2008 Organizational Structure Betty Day Director, Commercial Operations Don Tucker Settlement Metering Calvin Opheim Energy Analysis& Aggregation Amanda Bauld Settlements& Billing Karen Farley Retail Customer Choice Jackie Ashbaugh CO Data Integrity& Admin Beth Garza Congestion Analy. & Revenue Rights Kenneth Ragsdale Market Redesign Manager

3. 3 9/4/2008 Data Integrity & Administration (Jackie Ashbaugh) Commercial Operations – Departments & Core Functions Retail Customer Choice (Karen Farley) Settlements & Billing (Mandy Bauld) Energy Analysis & Aggregation (Calvin Opheim) Settlement Metering (Don Tucker) Ensure Transaction Integrity – Daily Assurance Owner of Data Extract Variance Resolution - Retail Market Synchronization −REPs / TDSPs / ERCOT −Reject monitoring −Issue analysis and resolution −Safety Net monitor /reconcile Systems Synchronization −NAESB & Paperfree −Paperfree & TCH −TCH & Siebel −MarkeTrak −ETS Retail systems health checks and problem identification Retail systems work flow exception clearing & reprocessing validation Retail SIR and upgrade testing, migration support and production verification Provide Level 3 Support for Market Participants, PUCT and ERCOT staff Nodal transition activities Mgmt & Admin, including SAS 70 and other audits Ensure COMS ESIID & Market Participant Data Integrity – Daily Assurance Ensure COMS Extracts and reports data integrity Owner of Data Extract Variance Resolution – Wholesale Consumption Data Loading Systems Synchronization −Siebel & Lodestar −Lodestar & EIS −Siebel & EIS −EIF & EIS Support Business Intelligence layer of EIS Lodestar system health checks and problem identification Lodestar system work flow exception clearing & reprocessing validation Siebel, Lodestar, & EIS SIR and upgrade testing, migration support and production verification Engaged in dispute resolution, as necessary Provide Level 3 Support for Market Participants, PUCT and ERCOT staff Nodal transition activities Mgmt & Admin, including SAS 70 and other audits Ensure the accuracy of Settlement calculations and Invoicing calculations Ensure timely delivery of Daily Settlement Statements and Weekly Invoices Conduct Annual & Monthly TCR Auction Process selected input data from - Data Agg, TCRs, Planning, Sys Ops) Ensure manual data imports and workarounds are executed correctly Ensure timely and accurate processing of Verifiable Cost submittals from QSE’s and Disputes Schedule runs for Lodestar system workflow Prepare standard monthly and ad-hoc reports Lodestar SIR and upgrade testing, migration support and production verification Engaged in dispute resolution, as necessary Provide Level 3 Support for Market Participants, PUCT and ERCOT staff Nodal transition activities Mgmt & Admin, including SAS 70 and other audit Data Aggregation −Modeling: Load Generation, NOIEs, DC Ties, Losses −Reporting & Posting: Losses, UFE, IDR est −Output Verification Load Profiling Modeling −Analysis −Segmentation −Weather Zones Daily Creation & Verification of Load Profiles Validate Profile Assignments to ESI IDs Analyze/Evaluate New Load Profile Requests Load Research Sampling/Data Analysis Monitor/Report Switched Load Lodestar SIR and upgrade testing, migration support and production verification Engaged in dispute resolution, as necessary Provide Level 3 Support for Market Participants, PUCT and ERCOT staff Nodal transition activities Mgmt & Admin, including SAS 70 and other audits Data Acquisition −EPS Meter Polling −VEE for EPS Meters −EPS Data Loading −Monitor TDSP Access to EPS Facilities EPS Meter Engineering −Design Approval −Exemption Approval −Site Approvals, Monitor, Review & Audit Inspector Training −Maintain Guides, Forms & Procedures −Maintain settlement metering web page −Review/Approve DLF methodology Competitive Metering −Status Reporting −Maintain Guides −Qualifying Meter List −Maintain Competitive Metering Web Page Engaged in dispute resolution, as necessary Provide Level 3 Support for Market Participants, PUCT and ERCOT staff Nodal transition activities Mgmt & Admin, including SAS 70 and other audits Congestion Analysis & Revenue Rights (Beth Garza) Congestion Analyses CRR Network Model Development CRR Market Administration and Validation CRR Market Development Annual and Monthly Competitive Constraints test Engaged in dispute resolution, as necessary Provide Level 3 Support for Market Participants, PUCT and ERCOT Staff Nodal transition activities Mgmt & Admin, including SAS 70 and other audit

4. 4 9/4/2008 Commercial Operations – Strategic Focus SB7 – perform core business operations at highest standard  Ensure that information relating to a customer’s choice of retail electric providers is conveyed in a timely manner to the persons who need the information  Ensure that electricity production and delivery are accurately accounted for among the generators and wholesale buyers and sellers in the region Nodal Implementation – wholesale market transformation Advanced Metering – retail market transformation

5. 5 9/4/2008 Questions