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Gary Romero SWAT-CATS-EHV Chairman

Arizona Corporation Commission. Workshop. Fourth Biennial Transmission Assessment 2006 - 2015. Gary Romero SWAT-CATS-EHV Chairman. June 6, 2006 Phoenix, Arizona. Study Work Participants. Arizona Public Service Salt River Project Southwest Transmission Cooperative Tucson Electric Power

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Gary Romero SWAT-CATS-EHV Chairman

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  1. Arizona CorporationCommission Workshop Fourth Biennial Transmission Assessment2006 - 2015 Gary Romero SWAT-CATS-EHV Chairman June 6, 2006 Phoenix, Arizona

  2. Study Work Participants • Arizona Public Service • Salt River Project • Southwest Transmission Cooperative • Tucson Electric Power • Western Area Power Administration

  3. Objectives • Perform a Ten Year Regional Transmission Assessment for Central Arizona • Develop a 2015 joint base case for Central Arizona • Assess the impact of the individual transmission plans on the overalltransmission system for Central Arizona • Provide a common foundation for filingTen-Year Plans

  4. Craig Hayden TOUTAH TOUTAH TO COLORADO Navajo San Juan Glen Canyon Four Corners TONEVADA TONEWMEXICO Mohave Davis Cholla TOCALIFORNIA Coronado TONEWMEXICO Springerville Parker PaloVerde Kyrene TOPHOENIX AREA TONEWMEXICO TO TUCSONAREA North Central Arizona Study Area COLORADO NEVADA UTAH Shiprock Marketplace Mead Mc Cullough Moenkopi El Dorado Electrical Substations Coal Generation Hydro Generation New Gas Generation CALIFORNIA Westwing PinnaclePeak ToDevers Liberty Rudd Silver King Browning Jojoba Hassayampa Greenlee ToMiguel North Gila Saguaro Vail South NEW MEXICO ARIZONA MEXICO

  5. Methodology Base Case Selection Update Base Case To 2015 Time frame Phoenix Area (N-0) (N-1) Analysis Phoenix Area Fix Problems Update Base Case With all Area Changes Southern Arizona (N-0) (N-1) Analysis Southern Arizona Fix Problems All Areas In (N-1) & (N-0) Analysis Central Arizona (N-0) (N-1) Analysis Central Arizona Fix Problems Refine Long Range Transmission Plan GTR 050/30/06

  6. Conclusions • There were no EHV N-0 and N-1 problems in the Study Area • Individual ten-year plans had no negative effects on the overall system when studied together for N-0 and N-1 analysis • Some problems identified on the under-lying systems. These problems will be addressed in the individual short term planning arenas

  7. Recommendations • This study should continue to be coordinated through SWAT such that every two years a ten-year study is performed to coincide with the ACC biennial transmission assessment. • The study process should use coordinated cases developed for joint planning studies. • SWAT should continue to be used as a forum to coordinate Regional Transmission Studies and to fulfill State and Regional Regulatory needs.

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