Texas Nodal Program Current Schedule and Recent Changes Tim Pare PMO TPTF Meeting August 27, 2007

Original schedule for completion of Baseline 0 pre-FAT – Oct 24, 2008 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 ABB Deliveries1 Components Revised date Documentation & integration artifacts Components to enable integration efforts to progress: Interface specifications (including XSD, WSDL, DDL/table scripts) Interface tables Oct 24, 07 MMS 2 Components to enable start of EDS 4 activities: DAM, HRUC, DRUC, SFT, PCD, SCED+, MI, CIM importer (without extensions) Dec 01, 07 FAT Start (Original Oct 24, 07) The following software drops from the vendor are still under negotiation MMS 2a Components to enable testing of SASM CIM Importer (with extensions), SASM Feb 01, 08 FAT Start MMS 3 Balance of MMS components: CCT, NSLR, WRUC, DC Tie, VDI Mar 31, 08 FAT Start 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 August 13-14, 2007 Texas Nodal Program Update

Working to minimize the impact of MMS schedule on EDS 4 - Illustrative Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Market Management System (MMS) Design, Interface defn MMS 2 MMS 2 a MMS 3 Final FAT MP Web Services Enterprise Integration (EIP) MMS – EMS Interface MMS – Settlements Interfaces EDS 4 DAM, RUC Rules Validation DAM, RUC with EMS/NMMS MMS with Settlements & Reports 168 Hour Test 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 August 13-14, 2007 Texas Nodal Program Update

The program schedule is based on 9 integrated Releases (linked to EDS) – with component FAT driving the front-end timeline EDS 1 Releases Release# Components Current FAT start Current FAT End Delta from baseline Release 1 EMS 1 – Base AREVA Product N/A Feb 1, 2007 Completed on schedule Release 2 EMS 2a – ICCP upgrade May 01, 2007 May 14, 2007 EDS 1 itself started on time and is scheduled to complete by Oct 30, 2007 with one MP exception August 13-14, 2007 Texas Nodal Program Update

The program schedule is based on 9 integrated Releases (linked to EDS) – with component FAT driving the front-end timeline EDS 2 Releases Release# Components Current FAT start Current FAT End Delta from baseline Release 3 EMS 2b – State Estimator and Telemetry Stats, SPS/RAP Jun 13, 2007 Jul 13, 2007 Completed 8 days behind on 7/21/2007 EMS 2c – State Estimator, Network Security Analysis upgrades Aug 20, 2007 Aug 31, 2007 Accelerated start by 6 days (currently in progress) EDW 1 – State Estimator and Telemetry reporting ? Delayed by AIX migration re-planning Release 4 NMMS 1 – CIM Model Jun 05, 2007 Jun 25, 2007 Completed on schedule NMMS 2 – UI, NOMCR, Case Builder Oct 01, 2007 Oct 15, 2007 Planned on schedule EMS –NMMS to EMS/MMS interface (CIM importer) Jan 15, 2008 Working with vendor teams to resolve issues EIP 1 – File exchange monitoring Feb 05, 2008 Mar 10, 2008 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 August 13-14, 2007 Texas Nodal Program Update

The program schedule is based on 9 integrated Releases (linked to EDS) – with component FAT driving the front-end timeline EDS 3 Releases Release# Components Current FAT start Current FAT End Delta from baseline Release 5 MMS 1 – Accelerated SCED May 01, 2007 Jun 01, 2007 Completed on schedule EMS 2c – RLC, SCED Interfaces Aug 20, 2007 Aug 31, 2007 Accelerated start by 6 days MIS – Links to apps, EDW, Public Data, Search Sep 10, 2008 Sep 30, 2008 Forecast on schedule REG 1 – Registration for MPs Zonal Go-Live complete EDW 2 – SCED Reporting ? Currently re-planning S&B 1 – CMM Base Product, Stmt Formats Aug 01, 2007 Forecast on Schedule EIP 3 – Interfaces for SCED June 11, 2007 Oct 25, 2007 MMS verifiable costs & Reports delayed until 9-28 Release 6 EMS 3 – Load Frequency Control, MTLF ported from Zonal Oct 09, 2007 Nov 05, 2007 EIP 4 – MMS to EMS Interfaces Nov 9, 2007 Dec 17, 2007 EDW 3– LFC Reports Release 7 CRR – All components to run CRR market, CRR Allocations, Auctions, Bilateral Trades Sep 26, 2007 Jan 21, 2008 EIP 5 – CRR Interfaces Jan 29, 2008 EDW 4 – CRR Reports 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 August 13-14, 2007 Texas Nodal Program Update

The program schedule is based on 9 integrated Releases (linked to EDS) – with component FAT driving the front-end timeline EDS 4 Releases Release# Components Current FAT start Current FAT End Delta from baseline Release 8 S & B 2 – Full Settlements & Billing, Statements & Invoices, CMM Customs, Lodestar Oct 01, 2007 Dec 15, 2007 Forecast on schedule EIP 6 – All Settlements Interfaces Sep 17, 2007 Mar 04, 2008 Re-planning to support MMS and CRR deliveries EDW 5 – Shadow Settlements ? Currently re-planning Release 9 MMS 2 - DAM, HRUC, DRUC, SFT, PCD, SCED+, MI, CIM importer Dec 01, 2007 MMS 2 a - CIM Importer (w/ext) , SASM Feb 01, 2008 MMS 3 - Balance of MMS components: CCT, NSLR, WRUC, DC Tie, VDI Mar 31, 2008 Outage Scheduler Jan 21, 2008 Forecast 45 days delay S & B 3 – Financial Transfer, Interfaces with Settlements and Finance Jan 01, 2008 Mar 01, 2008 EMS 4 – MTLF, LTLF, RPP Jan 25, 2008 Feb 22, 2008 Re-planning to support MMS EDW 6 - DAM Reporting EIP 7 – Remaining MMS interfaces Oct 22, 2007 Mar 26, 2008 EMS 5 – Study Apps, Voltage Support, Outage Evaluation Mar 24, 2008 Apr 11, 2008 S & B 4 – Disputes Jun 01, 2008 EDS 4 scheduled to start, early, Jan 2008 (with Bids and Offers Validation) August 13-14, 2007 Texas Nodal Program Update

Time line update August 13-14, 2007 Texas Nodal Program Update Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Network Model Management System (NMMS) CIM UI, NOMCR EDS 2 FAT Energy Management System (EMS) ICCP Upgrade SE & Telemetry SCED Interfaces, RLC LFC CIM Importer RPP, LF Study Apps Market Management System (MMS) RT FAT DAM, RUC, SASM Build and BL 1 & 2 changes DAM, RUC, SASM , CIM FAT VDI, DC Tie Congestion Revenue Rights (CRR) FAT Key FAT Start FAT end EDS Start EDS End Go-Live Enterprise Integration (EIP) SCED, CRR Interfaces Build and FAT DAM, RUC, SASM S&B Interfaces Build and FAT Commercial Systems (COMS) CMM 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 Market Information System (MIS) FAT Currently re-planning Enterprise Data Warehouse (EDW) Currently re-planning Build ITest & EDS1/2 Build EDS 3 Build EDS 4 and Fail-Over Envy Infrastructure (INF) Build Dev Environments Build ITest EDS 1 168 Hour Trials EDS 2 EDS EDS 3 EDS 4 CRR Auction 10/15 RT Market 12/01 DA Market 12/08 Readiness Metrics Start MP Registration Single Entry Model 3/31/ ERCOT / MP Readiness & Implementation Today August 13-14, 2007 Texas Nodal Program Update