EDS 2 Early Delivery Systems Approach March 2007

Page 2 2 EDS 2 – Approach and Schedule March 2007 EDS 2 – Early Delivery Systems Agenda –EDS 2 Main Objectives Scope Approach System Requirements Desired Schedule

Page 3 3 EDS 2 – Approach and Schedule March 2007 EDS 2 – Early Delivery Systems EDS 2 – Main Objectives –Verify Telemetry Performance Provide reporting to TSPs/QSEs Continue resolution of any data issues –Load Modeling Restructure load model to improve bus load forecasting –Verify State Estimator Performance Provide reporting to TSPs/QSEs Resolution of new data issues –Verify Network Security Functions Verify transmission constraint management Verify dynamic ratings Verify Special Protection Schemes (SPS) / Remedial Action Plans (RAP) –Verify Network Operations Model and change request process Verify Network Operations Model fidelity Verify NOMCR process

Page 4 4 EDS 2 – Approach and Schedule March 2007 EDS 2 – Early Delivery Systems EDS 2 – Scope of Transition Plan Tasks TasksTransition Plan Task Descriptions (2a) Verify all data and telemetry submittals meet Protocol 3.10 (NOMCR) (2b) Verify accuracy of all transmission element constraints (2c) Verify TSP calculations for transmission constraints likely to be binding in SCED (1) Verify SE performance meets Protocol (2) Verify trial of SE test based on live SCADA, resolving errors to meet performance criteria, and to verify bus load forecast functionality (4) Begin continuous operation of SCADA and post information to TSPs and QSEs meeting Protocol (1) Begin NSA verification, testing major transmission elements (2) Compare NSA to Zonal and add contingencies and screening (3) Continuously monitor Mon-Fri meeting Protocol

Page 5 5 EDS 2 – Approach and Schedule March 2007 EDS 2 – Early Delivery Systems EDS 2 – Approach –Release 3 Restructure ERCOT’s Network Load Model Verify SE and Telemetry performance Provide performance reports to TSPs and QSEs Verify Network Security Analysis (NSA) Develop Maintenance Procedures –Release 4 Verify Network Model Management System (NMMS) integration with EMS Verify Network Operations Model Change Request (NOMCR) process Develop Network Model Maintenance Procedures

Page 6 6 EDS 2 – Approach and Schedule March 2007 EDS 2 – Early Delivery Systems EDS 2 Release 3 - Approach –Load Model Verify load adaptation functionality Verify changes to bus load forecasting –Data Cleanup Analyze Telemetry and SE performance results Develop and implement procedures to: –Identify specific point issues –Resolve point issues with TSPs / QSEs –Implement TSP / QSE changes via change request process –Observe and re-verify performance improvements –SE Tuning Work with EMS team to analyze and tune SE for optimal results –Network Security Analysis Verify dynamic ratings Verify constraints and contingency list Verify Special Protection Schemes (SPS) / Remedial Action Plans (RAP) Verify load rollover modeling Verify transmission constraint management Develop Nodal NSA operating procedures Benchmark results against Zonal real time operations

Page 7 7 EDS 2 – Approach and Schedule March 2007 EDS 2 – Early Delivery Systems EDS 2 Release 3 - Systems –Release 3 configuration Early releases of software packages –EMS 2.3 (COTS+ - Commercial off the Shelf with customizations) »Telemetry Performance Tool »SE Functionality »SE Performance Tool »NSA Functionality –Enterprise Data Warehouse »Reporting on SE and Telemetry performance by QSE and TSP –MIS Portal »Providing QSE and TSP access to reports >

Page 8 8 EDS 2 – Approach and Schedule March 2007 EDS 2 – Release 3 Configuration

Page 9 9 EDS 2 – Approach and Schedule March 2007 EDS 2 – Early Delivery Systems EDS 2 Release 4 - Approach –Verify that the Network Model Management System (NMMS): Network model, ICCP database and with ownership / operatorship information Nodal Network Model is under change control –Verify NMMS integration with Nodal EMS –Verify Network Operations Model change request process (NOMCR) TSPs and QSEs electronically submit model changes and receive acknowledgement Network model has been correctly updated TSP and QSE updates are confirmed TSPs may export network model for review

Page EDS 2 – Approach and Schedule March 2007 EDS 2 – Early Delivery Systems EDS 2 Release 4 - Systems –Release 4 configuration Early releases of software packages –Network Model Management System (NMMS) »Database for network model, ICCP mapping, Ownership/Operatorship –EMS 2.3 (COTS+) »Integration with NMMS >

Page EDS 2 – Approach and Schedule March 2007 EDS 2 – Release 4 Configuration

Page EDS 2 – Approach and Schedule March 2007 EDS 1 and 2 – Early Delivery Systems EDS 1 Schedule EDS 2 Schedule

Page EDS 2 – Approach and Schedule March 2007 EDS 1 – Release 1 Configuration

Page EDS 2 – Approach and Schedule March 2007 EDS 1 – Release 2 Configuration

Page EDS 2 – Approach and Schedule March 2007 EDS 2 – Release 3 Configuration

Page EDS 2 – Approach and Schedule March 2007 EDS 2 – Release 4 Configuration