Texas Nodal Program Current Schedule and Recent Changes

1. Texas Nodal Program Current Schedule and Recent Changes Tim Pare PMO TPTF Meeting

2. MMS vendor has proposed delivering the balance of MMS in multiple drops, rather than one, to incorporate Baseline 1 & 2 – we are re-negotiating scope and schedule to suit our EDS demands 1MMS 1 – Accelerated SCED, delivered on schedule • Multiple parallel tracks are proposed: • Documentation • Functional development • Interfaces • CIM Model • MIS Reports • MMS UI (Operator interface, MP interface) • Test procedure/data review • User guide • Training Original schedule for completion of Baseline 0 pre-FAT – Oct 24, 2008 Texas Nodal Program Update

3. Working to minimize the impact of MMS schedule on EDS 4 - Illustrative Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec • Integration priorities being re-defined to suit MMS deliveries • Phased approach for EDS 4 to match the Transition Plan objectives and to synchronize with MMS deliveries Market Management System (MMS) Design, Interface defn Final FAT MMS 2 MMS 2 a MMS 3 MP Web Services Enterprise Integration (EIP) MMS – EMS Interface MMS – Settlements Interfaces DAM, RUC Rules Validation DAM, RUC with EMS/NMMS MMS with Settlements & Reports 168 Hour Test EDS 4 Texas Nodal Program Update

4. The program schedule is based on 9 integrated Releases (linked to EDS) – with component FAT driving the front-end timeline EDS 1 Releases • EDS 1 itself started on time and is scheduled to complete by Oct 30, 2007 with one MP exception Texas Nodal Program Update

5. The program schedule is based on 9 integrated Releases (linked to EDS) – with component FAT driving the front-end timeline EDS 2 Releases • EDS 2 Release 3 (State Estimator Tuning and Verification) scheduled to start (on time) Sep 4, 2007 – although with an interim solution for delivery of SE Reports • EDS 2 Release 4 (Network Model Verification) scheduled to start (on time) Nov 1, 2007 Texas Nodal Program Update

6. The program schedule is based on 9 integrated Releases (linked to EDS) – with component FAT driving the front-end timeline EDS 3 Releases • EDS 3 started, Aug 24, 2007 (with Release 5 phase 1) • SCED integrated with EMS, will be released to the EDS by Nov 01, 2007 • Currently detailing CRR and LFC EDS plans by working with ERCOT business and Market Participants Texas Nodal Program Update

7. The program schedule is based on 9 integrated Releases (linked to EDS) – with component FAT driving the front-end timeline EDS 4 Releases • EDS 4 scheduled to start, early, Jan 2008 (with Bids and Offers Validation) Texas Nodal Program Update

8. Time line update Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Network Model Management System (NMMS) EDS 2 FAT CIM UI, NOMCR Energy Management System (EMS) SE & Telemetry ICCP Upgrade SCED Interfaces, RLC LFC CIM Importer Study Apps RPP, LF RT FAT Market Management System (MMS) VDI, DC Tie DAM, RUC, SASM Build and BL 1 & 2 changes DAM, RUC, SASM , CIM FAT FAT Congestion Revenue Rights (CRR) SCED, CRR Interfaces Build and FAT Enterprise Integration (EIP) DAM, RUC, SASM S&B Interfaces Build and FAT CMM Commercial Systems (COMS) S&B Build S&B FAT Financial Transfer FAT Disputes FAT Acronym Key FAT – Factory Acceptance Testing EDS – Early Delivery System I test – Integration Testing FAT Market Information System (MIS) Currently re-planning Enterprise Data Warehouse (EDW) Currently re-planning Build ITest & EDS1/2 Build EDS 3 Build EDS 4 and Fail-Over Envy Build ITest Infrastructure (INF) Build Dev Environments EDS 1 168 Hour Trials EDS 2 EDS 3 EDS EDS 4 DA Market 12/08 CRR Auction 10/15 RT Market 12/01 Single Entry Model 3/31/ Readiness Metrics Start MP Registration ERCOT / MP Readiness & Implementation Today Texas Nodal Program Update