APS Ten-Year Plans 2006-2015 4th BTA Presentation Bob Smith Manager Transmission Planning June 6, 2006

APS EHV & OUTER DIVISION 115/230 KV TRANSMISSION PLANS 2006 - 2015 PAGE TO NAVAJO CRYSTAL FOUR CORNERS 500KV J/O 5 K V MOENKOPI TO CALIF. 345KV TO MEAD / To GLEN MARKETPLACE 500KV J/O SELIGMAN CANYON (WAPA) FLAGSTAFF COCONINO ROUND VALLEY YAVAPAI VERDE 2 circuits FLAGSTAFF (APS) 2009 230KV FLAGSTAFF BAGDAD WILLOW (WAPA) CHOLLA LAKE ) SECOND KNOLL 2009 ( A S R ( A P P ) CORONADO PRESCOTT W A W P A ( ) VV1 2009 PREACHER RACEWAY 2010 GAVILAN 2012 PEAK CANYON 2009 TS5 WEST 2012 MAZATZAL O WING 5 K V J / PHOENIX PINNACLE PALO VERDE- PEAK HASSAYAMPA LIBERTY LIBERTY 2012 J/O RUDD KYRENE JOJOBA KNOX 500KV REDHAWK DESERT J/O T GILA RIVER/ B D BASIN TO CALIF. CASA 500KV N.GILA PANDA GRANDE GILA BEND SANTA T B D YUMA ROSA SAGUARO TAT MOMOLI ORACLE SAN MANUEL YUCCA JUNCTION LEGEND EXISTING 500 KV LINES TUCSON ADAMS EXISTING 345 KV LINES EXISTING 230 KV LINES POWER PLANT EXISTING 115 KV LINES PLANNED 500KV LINES NUCLEAR POWER PLANT MURAL PLANNED 345KV LINES PLANNED 230KV LINES PLANNED 115KV LINES 115KV & ABOVE SUBSTATION (EXISTING) NORTH 12/1/05 June 6, 2006 4th BTA 230KV & ABOVE SUBSTATION (FUTURE) Transmission Planning J/O JOINT OWNSHIP Substation locations and line routings depict an electrical connection only and do not reflect any assumed physical locations or routing.

PHOENIX METROPOLITAN AREA TRANSMISSION PLANS 2006-2015 To Navajo 2006-2015 To New To Prescott Waddell Raceway GAVILAN PEAK 500KV 2010 AVERY 2009 CAREFREE HWY. TBD 2010 TS6 W . A D P R TO 2010 500kv (SRP) TBD A GLEN J/O M A I CANYON P (WAPA) TO A CHOLLA A P W 345KV 2010 2 - Circuits 2 - Circuits TS1 2009 TS5 TBD J/O 2010 2011 TS2 TBD TO SRP W Y . SRP PALO WESTWING F PINNACLE PEAK VERDE 1 7 REACH - I TO PALO VERDE SURPRISE TBD DEER LONE PEAK VALLEY BELL RD. J/O APS/SRP CACTUS D . R EL SOL AGUA D ALEXANDER SUNNYSLOPE L FRIA E F I GLENDALE . W Y H C 1 7 F T I - L I BETHANY HOME RD. MCDONALD RD. WHITE TANKS 2007 PALM VALLEY MEADOWBROOK (APS) BUCKEYE I - 10 FWY. COUNTRY CLUB W A P A LIBERTY/TS4 LINCOLN ST. RUDD WEST PHOENIX I - 10 FWY. OCOTILLO TO PALO VERDE 500KV SUPERSTITION FWY. . BASELINE RD.. W Y KYRENE F KNOX TO BROWNING BASELINE RD.. APS EXISTING 500KV LINES 230KV SUBSTATION (EXISTING) 1 - (SRP) 500kV APS EXISTING 345KV LINES I APS EXISTING 230KV LINES 230KV SUBSTATION (FUTURE) TO UNDERGROUND 500kV GENERATING SITE & GILA BEND APS PLANNED LINES 230KV SUBSTATION TO JOJOBA 230KV JOINT OWNSHIP J/O Transmission Planning June 6, 2006 4th BTA OTHER COMPANY LINES TO SANTA ROSA Substations locations and line routings are approximate 500KV 345KV

Changes from 2004 to 2006 Project Status 2005 Gavilan Peak 230kV Completed TS3 230/69kV substation Named Palm Valley 2006 Rudd-Palm Valley-TS4 230kV Changed to I/S date of 2007 2006 Flagstaff 345/69kV interconnection Changed to I/S date of 2009 2006 Jojoba cut-in of TS4-Panda 230kV Changed to I/S date of 2011 South East Valley 500kV project - Hassayampa-Pinal West & Pinal West-Santa Rosa-Browning Removed from APS plan - APS no longer participating 2007 PV Hub-TS5 500kV Changed to I/S date of 2009 and added interconnection options (AVGS & HQJNT) June 6, 2006 4th BTA

Changes from 2004 to 2006 Project Status 2007 TS5-TS1 230kV Changed to I/S date of 2009 2008 TS1-TS2-Palm Valley 230kV w/TS2 I/S of 2012 Changed to I/S date of 2010 w/TS2 I/S date of 2011 2008 RY-AV 230kV 2009 PP-TS6-AV 230kV 2009 Second Knoll 500/69kV Interconnect moved from CO-SK line to CO-CH line 2010 TS5-RY 500kV Changed to I/S date of 2012 2010 WW-RY 230kV Changed to I/S date of TBD 2012 Gila Bend-TS8 230kV Replaced with PV Hub-N.G. 500kV June 6, 2006 4th BTA

Changes from 2004 to 2006 Project Status 2013 WW-ES 230kV Changed to I/S date of TBD TBD Mazatzal 345/69kV Changed to I/S date of 2011 2009 VV1 500/69kV New Project 2010 TS9-PP 500kV 2012 N.G.-TS8 230kV TBD Yucca-TS8 230kV TBD SR-Pinal South 230kV June 6, 2006 4th BTA

Conceptual Projects TransWest Express Transmission from Wyoming to Arizona and/or southern Nevada Access coal and wind resources in Wyoming Three AC alternatives Looking at 500kV and 765kV options One DC alternative Developing through open stakeholder process Compliments other planned projects Cost range $2B-$5B June 6, 2006 4th BTA

Conceptual Projects: TransWest Express Project June 6, 2006 4th BTA

Conceptual Projects 230kV west of White Tank Mountains Large developments planned for the area immediately to the west of the White Tank Mountains 230kV line(s) between TS5 substation and Buckeye substation Working with developers, gov’t agencies, and any identified stakeholders to stay ahead of the growth. June 6, 2006 4th BTA

PHOENIX METROPOLITAN AREA TRANSMISSION PLANS 2006-2015 ALEXANDER J/O APS/SRP 2010 AVERY 2009 To Prescott GAVILAN PEAK W A P 2 - Circuits 345KV TO GLEN CANYON (WAPA) CHOLLA PHOENIX METROPOLITAN AREA TRANSMISSION PLANS 2006-2015 TS6 Transmission Planning GLENDALE APS EXISTING 500KV LINES APS EXISTING 345KV LINES APS EXISTING 230KV LINES UNDERGROUND APS PLANNED LINES 230KV 500KV 230KV SUBSTATION (EXISTING) 230KV SUBSTATION (FUTURE) GENERATING SITE & 230KV SUBSTATION JOINT OWNSHIP OTHER COMPANY LINES J/O CAREFREE HWY. T B D ( S R ) BETHANY HOME RD. Substations locations and line routings are approximate 345KV 2 1 TBD SURPRISE AGUA FRIA EL SOL DEER VALLEY RUDD TO PALO VERDE WEST PHOENIX 2007 PALM VALLEY 2010 2012 TS2 TS1 2009 WESTWING LIBERTY/TS4 BUCKEYE TO GILA BEND To Navajo W A P PALO VERDE TS5 500KV To New Waddell WHITE TANKS (APS) 2009 2010 TO PALO VERDE 500kv J/O L I T C H F E D R . Raceway P M A TBD BELL RD. I - 10 FWY. BASELINE RD.. I - 1 7 F W Y . SUPERSTITION FWY. MCDONALD RD. PINNACLE PEAK CACTUS OCOTILLO KYRENE 500kV TO JOJOBA KNOX (SRP) TO BROWNING TO SANTA ROSA REACH LONE PEAK SUNNYSLOPE MEADOWBROOK LINCOLN ST. COUNTRY CLUB 2010 J/O TBD SRP SRP W Y . K P Y E L A L V N S U June 6, 2006 4th BTA