Special Open Meeting of the Arizona Corporation Commission Energy Workshop February 16, 2001 Arizona Public Service Company Cary B. Deise Director, Transmission Operations and Planning

2 Overview  Reliability  Service Territory  Load Forecast  Resources  Fuel Supply Plan  Transmission  Conclusion

3 Reliability  To meet customers electric energy requirements on time.  Factors impacting reliability  Customer Requirements  Transmission, Generation and Distribution availability  Weather  Neighboring systems

4 APS Service Territory

5 APS Valley Service Territory

6 Peak Load Forecast 5.7% Residential Commercial Industrial Other Residential Commercial Industrial Other % Residential Actual Commercial Industrial Other Values in MW

7 Existing Generation 3982 APS Existing Generation (Nominal ratings in MW) Cholla 615 Four Corners 782 Navajo 315 WPhoenix 365 Ocotillo 366 Saguaro 319 Douglas 16 Palo Verde 1105 Yuma 147

8 Resources  Existing Generation Renewable 9 13  Additions Upgrade of existing CC&CT Reactivate WPhx Steam 4& WPhx CC Temporary WPhx CT’s - 5 units 99 (99) Temporary Saguaro CT’s - 5 units 99 (99) Redhawk CC 1&2 _-__ 988 Subtotal  Long-term Contracts Pacificorp Exchange SRP_______________ Subtotal  Short-term Contracts  Total Resources

9 APS Load and Resources Margin Peak LoadResources Margin ResourcesPeak Load 2001

10 APS fuel supply plan is characterized by Diverse fuel types Firm contracts Futures and options contracts Spot market transactions Duel fuel burning capacity at existing gas fired plants Fuel Supply Plan

11 Fuel Supply Continued Projected annual fuel consumption

12 Length of Supply and delivery contracts Fuel Supply Continued Coal: Depending on plant Natural Gas: Firm supply contracts with 100% coverage through 2002; transport 2013 Nuclear: 100% coverage through 2003; evaluating proposals for 2004 to 2008

13 APS EHV System Transmission Capacity less wheeling obligations N. Gila 140 Navajo 315 Westwing Moenkopi Yavapai 559 Palo Verde 1105 Kyrene 1643 Pinnacle Peak Saguaro Mead Four Corners 782 Cholla kV 345kV

14 APS EHV System Total Transmission to Load Purchased Transmission Total Remote Generation (2817) (3805) Purchase (Pac + Short-Term) (1656) (1118) Margin

15 Overhead Underground APS Valley 230kV Transmission Pinnacle Peak Reach Kyrene Ocotillo Westwing Country Club Agua Fria Alexander West Phoenix White Tanks

16 APS Valley Load Serving Capability Existing Transmission Generation (WPhx & Ocotillo) 701__-___ Subtotal Transmission Additions 270 Generation Additions 386 (99) Load Serving Capacity Valley Load (3800)(3950) Margin

17 Conclusions Transmission additions are critical. APS fuel sources are secure and diverse. Future new generation is critical.

18 Conclusions (cont.) APS has and will acquire the resources necessary to achieve reliable system operations in 2001 and 2002 Although the APS plans meet the forecast reliability requirements, unforeseen events such as violent storms, extreme hot spells,equipment failures and construction delays can threaten the security and adequacy of the electric power system.

19 The End