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Arizona Corporation Commission

Arizona Corporation Commission. Docket No. E-00000D-07-0376 2008-2017 Biennial Transmission Assessment Workshop II September 18, 2008. Agenda. Introductions and Workshop Overview Review of BTA Workshop 1 Action Items

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Arizona Corporation Commission

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  1. Arizona Corporation Commission Docket No. E-00000D-07-0376 2008-2017 Biennial Transmission Assessment Workshop II September 18, 2008

  2. Agenda • Introductions and Workshop Overview • Review of BTA Workshop 1 Action Items • Summary of Comments Received on 2008 First Draft BTA Report • Overview of Second Draft BTA Report • Significant Additions/Modifications • Responses to Docketed Comments Not Incorporated in Second Draft • Workshop 2 Participants’ Responses to 2008 Second Draft BTA • Closing Remarks Regarding 2008 BTA Process 2008 BTA Workshop II

  3. Workshop I Action Items • Workshop I Presentations Filed with Docket Control - Completed • SCE to file PVD2 Study Work with Docket Control - Completed • Salt River Project to file a summary of EHV Transmission Upgrades occurring in Arizona as it relates to transmission path rating increases - Completed • WAPA agreed to provide a letter in response to two questions regarding their transmission plan: • The CATS EHV Ten Year Snapshot and N-1-1 presentation indicates that the “N-1 contingencies overload conditions associated with WAPA’s transmission elements were not resolved.” The question posed was – “were Western’s planned upgrade of 115 kV lines to 230 kV modeled as 230 kV lines in the 2016 case and if not would doing so have resolved the overloads?” The context of this question relates both to the WAPA system in Pinal County and along the Colorado River. • The status and modeling of the San Luis Rio Colorado generation project and North Branch 230 kV lines were questioned during the Yuma RMR study presentation. What is the current status of these projects? • APS agreed to file a supplement to the 2007 SWAT Renewable Energy Transmission Task Force Report - Completed • APS agreed to file an explanation of what has been done to address California’s Market Redesign and Technology Upgrade (“MRTU”) tariff impact on transmission seams issues with neighboring states - Completed 2008 BTA Workshop II

  4. Parties Commenting onFirst Draft BTA Report • Arizona Public Service • Salt River Project • Southwest Transmission Cooperative • Tucson Electric Power / UniSource Electric • Western States Energy Solutions • Interwest Energy Alliance • Sulphur Springs Valley Electric Cooperative • Robert S. Lynch and Associates • Southwestern Power Group • SkyFuel 2008 BTA Workshop II

  5. Nature of Filed Comments Comments to the First Draft Report revealed four specific areas of key concern regarding adequacy of Arizona’s transmission system: • Cochise County Transmission • RMR Study Work • Renewables and Related Transmission • “To Be Determined” In-Service Date Projects 2008 BTA Workshop II

  6. Cochise County- Comments and Responses - 2008 BTA Workshop II

  7. Cochise County Findings • SWTC complied with ACC 4th BTA order to file transmission plan to solve overloads for three N-1 outages • Staff finds SWTC’s Sloan to Huachuca 230 kV line (TBD) inadequate due to perpetuating “restoration of service” practices through 2026 • A.C.C. R14-1609.B places the obligation for ensuring adequate transmission import capability with the Utility Distribution Company • TEP unable to restore full service to Ft. Huachuca for N-1 outage of Vail to Huachuca 138 kV line • APS contemplating 2nd emergency 69 kV tie with SSVEC • SSVEC vulnerable to lengthy customer outages for N-1 outages and proposes looped transmission service • Staff recommends a long range study to establish “continuity of service” plan for Cochise County and transition within 5-10 years. Appropriate elements to be incorporated in ten year plans filed for the next BTA 2008 BTA Workshop II

  8. Proposed Change to Recommendation 3.d. APS, SSVEC, and TEP are to perform collaborative studies and file a report of those studies for the next BTA that establishes a long range system plan for Cochise County that is founded on the principle of continuity of service following a transmission line outage. SWTC will participate in this study as the sole transmission service provider for SSVEC. Relevant elements of that plan are to be incorporated in APS’, SWTC’s and TEP’s respective ten year plans with a defined in service date and filed with the Commission in January 2010. 2008 BTA Workshop II

  9. Transmission Import and RMR Study Work- Comments and Responses - 2008 BTA Workshop II

  10. Renewables and Related Transmission- Comments and Responses - 2008 BTA Workshop II

  11. “To Be Determined” In-Service DatesComments and Responses 2008 BTA Workshop II

  12. Other Non-Adequacy Related Items- Comments and Responses - 2008 BTA Workshop II

  13. Workshop II Participants’ Response • Has the Second Draft BTA adequately addressed your concerns with the First Draft? • Does the Second Draft BTA raise any new issues or concerns? • Additional Comments or Concerns regarding Second Draft? 2008 BTA Workshop II

  14. Conclusion • Utilities Division will submit Final Report and Proposed Order to the Commission by October 17, 2008 • Open Meeting date for Commission consideration of the 2008 BTA is unresolved. Watch for an open meeting notice • Thank you for your participation and feedback. Please ensure you have signed in so we have a record of your attendance 2008 BTA Workshop II

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