Lead from the front Texas Nodal 1 Registration Market Call June Data Collection Window June 19, 2009

Lead from the front Texas Nodal 2 Antitrust Admonition ANTITRUST ADMONITION ERCOT strictly prohibits Market Participants and their employees who are participating in ERCOT activities from using their participation in ERCOT activities as a forum for engaging in practices or communications that violate the antitrust laws. The ERCOT Board has approved guidelines for members of ERCOT Committees, Subcommittees and Working Groups to be reviewed and followed by each Market Participant attending ERCOT meetings. If you have not received a copy of these Guidelines, copies are available at the Client Relations desk. Please remember your ongoing obligation to comply with all applicable laws, including the antitrust laws. DISCLAIMER All presentations and materials submitted by Market Participants or any other Entity to ERCOT staff for this meeting are received and posted with the acknowledgement that the information will be considered public in accordance with the ERCOT Websites Content Management Operating Procedure.

Lead from the front Texas Nodal 3 Agenda Antitrust Admonition Updates and Progress Reminders FAQ / Common Issues Q&A / Open Forum ERCOT asks that you log into the WebEx using your company name then your name. This will allow us to take roll call offline. If you have not logged in with your company name, please use the WebEx chat to tell the host your company is represented

Lead from the front Texas Nodal 4 Updates and Progress 2009 MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Private Use Network Transmission Data Collection June Window - Non-Wind Transmission / Planning / Protection Data Collection - Iteration 1 - Iteration 2 - Iteration 3 - Iteration 1 - Iteration 2 - Iteration 3 Private Use Network Planning and Protection Data Collection September Window - Wind / All Remaining Sites Transmission / Planning / Protection Data Collection - Iteration 1 - Iteration 2 - Iteration 3 MP-10 Phase 2 Final Validation SEM GO-LIVE 8/31 85% Prod Quality 95% Prod Quality 98% Prod Quality 85% Prod Quality 95% Prod Quality 98% Prod Quality 85% Prod Quality 95% Prod Quality 98% Prod Quality Kick Off Market Call

Lead from the front Texas Nodal 5 Updates and Progress June Window Iteration 1 Status –All Audit Report / Pre-Populated RARF’s sent on 6/5 –Resource Entity Revisions Iteration 1 of June Window began 6/15 –Individual Resource Entity conference calls started on 6/17 –Iteration 1 Revisions due on 7/13/09 Revision Metrics Revisions Received Week Ending 6/19: 3 RARF’s Accepted to Date: 0 Current Production Quality Metric (will publish next week) Production Quality Metric represents the % of data received that is passing the business rules Initial metric uses pre-populated RARF data Data set measured only includes those Generation Sites participating in the current window

Lead from the front Texas Nodal Reminders Resource Entities with Load Resources will be contacted over the next several weeks regarding the following issues: –Load Resources mapped to TSP Load Required in EMS to associate with TSP telemetry May require Resource Entity to work with TSP to verify Those who would like to do this in advance can submit mapping to –ERCOT will populate this in Load Resource RARF –Once populated, this is sent to the RE to verify and officially submit –NPRR162 Change the Sign Convention of Net Real Power Consumption, LPC and MPC of Load Resources Those who have not adjusted their data will be asked to modify their RARF during this window

Lead from the front Texas Nodal Reminders Other Registration Activities Occurring During the June Window –Nodal Registration of Block Load Transfer –Nodal Registration of Non-Modeled Generation Generation under 10MW Appendix contains slides of particular importance from previous calls

Lead from the front Texas Nodal FAQ / Common Issues Known issues with Audit Reports: –Auxiliary Power % Small vs. Large Motor not calculating properly in some cases % MW and % MVAR must equal 100% In some cases rounding is displaying a false negative (error) on the audit reports –Base MVA errors are producing non-meaningful impedance warnings Data reviewed on the pre-populated RARF uncovered some RE’s have submitted KVA rather than MVA For example, when this occurs, the warning message on Direct Axis Subtransient reactance, X"di will display an incorrect range as it uses the Base MVA to calculate the desired boundary conditions –Resource Category needs to be re-selected from menu (previously misspelled) If you receive an error on Unit Info – GEN/CC/Wind Resource Category, simply re-select the appropriate category from the drop-down list –Some CC Units still have power augmentation represented as a separate configuration This is a warning due to dually connected trains (e.g. SPP / ERCOT) Current Combined Cycle White Paper states that power augmentation capacity shall be represented in an existing configuration White Paper URL: _nodal_design_v3.doc _nodal_design_v3.doc

Lead from the front Texas Nodal FAQ / Common Issues TSP Data in RARF’s –Reminder that in many cases TSP assets will have been loaded into the pre-populated RARF’s –This is due to the difficulty of delineating ownership from the zonal system –In these cases, please remove this data from your RARF and adjust columns to the left to eliminate blank columns Breaker “Normal Operating Status” –Breakers between a generator and the resource node must be registered as normally closed –If it is not RUC will not be able to commit the resource –If a resource is unavailable to RUC, the QSE’s telemetry will overwrite the registered value and QSE’s COP will be set to OUT (offline / unavailable)

Lead from the front Texas Nodal 10 Q&A Q&A / Open Forum

Lead from the front Texas Nodal 11 Appendix

Lead from the front Texas Nodal 12 Reference Links

Lead from the front Texas Nodal 13  PSSE templates are located at  Readiness Center  RARF Guide  Weekly Dashboard (under weekly status) Reference Links

Lead from the front Texas Nodal 14 June Data Collection Window Schedule Originally presented on 5/22/09

Lead from the front Texas Nodal 15 Updates and Progress Originally presented on 5/22/09 Receive Audit Report and pre-populated RARF week of 6/8 Conference call with Account Managers starting week of 6/15 Iteration 1 corrections due 7/13/09 (20 business days) Iteration 2 corrections (if needed) due 8/12/09 (15 business days) Iteration 3 corrections (if needed) due 9/1/09 (10 business days)