Arizona Planned EHV Facilities

1
Arizona Planned EHV Facilities
NAVAJO
FOUR
RED MESA EAST
2010
CORNERS

• Planned EHV Projects
• PV-TS5-TS9-PP 500kV
• Southeast Valley
• Pinal South-Tortolita 500kV
• Palo Verde-North Gila 500kV
• Navajo Transmission Project

500KV J/O
500KV
MOENKOPI
TO CALIF.
345KV
To GLEN
TO MEAD /
500KV J/O
CANYON
(WAPA)
MARKETPLACE
SELIGMAN
COCONINO
ROUND
2 circuits
230KV
YAVAPAI
VERDE
VALLEY
FLAGSTAFF
CHOLLA
BAGDAD
(WAPA)
FLAGSTAFF
WILLOW
LAKE
(APS)
(SRP)
2009
SECOND
(WAPA)
(WAPA)
KNOLL
2009
CORONADO
PREACHER
GAVILAN
TS9
CANYON
PEAK
2010
2012
2010
MAZATZAL
2009
TS5
TBD
WEST
2009
WING


PINNACLE
500KV J/O
PEAK
PALO VERDE-
LIBERTY
HASSAYAMPA
RUDD
KYRENE
BROWNING
JOJOBA
2011
KNOX
PINAL
DESERT
500KV
REDHAWK
2008
WEST
J/O
BASIN
2011
GILA RIVER
2012
N.GILA
CASA GRANDE
J/O
2011
GILA BEND
PINAL SOUTH
SANTA
ROSA
SAGUARO
ORACLE
TAT MOMOLI
YUCCA
SAN MANUEL
2011
JUNCTION
TORTOLITA
ADAMS
MURAL
NORTH
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V. TransWest Express Project

• 3000 MW line between WY and AZ, 1000 miles
• 2015 In-service Date
• APS completed Feasibility Study

• SRP, SCE, TEP potential partners
• National Grid, as Development Manager, and WIA
  selected
• One of the AC alternatives shown

3
V. PacifiCorp Gateway Projects
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II. Scope and Timing of the Agreement

• Six months
• Undertakes preliminary co-development activities
• Extends ongoing work for additional transmission
  capacity
• National Grid to lead with APS, PacifiCorp, and
  WIA support
• Advantages of collaboration versus proceeding
  individually
• Decision on next steps to be made in 2008

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II. Shared Goals of the Participants

• Strong integrated regional transmission to the
  Rocky Mountain and Desert Southwest regions
• APS Wyoming to Arizona
• PacifiCorp Wyoming to Utah to Desert Southwest
• National Grid Lead developer
• WIA Transmission infrastructure to transport
  Wyoming energy resources
• Doesnt change previously announced APS and
  PacifiCorp plans

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III. Agreement Addresses Regional Transmission
System Needs

• Growing regional demand for electricity
• Addresses shared aspects of previously identified
  APS and PacifiCorp transmission projects
• Electric infrastructure critical for all other
  infrastructure water, sewer, medical and
  transportation
• Strong regional integrated transmission
  essential for improved access to planned
  renewable energy resources and other generation
  options
• Collaboration may yield substantial benefits

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IV. Potential Regional Benefits

• Meet growing demand
• Improve overall electric reliability for the West
• Improve access for renewable energy resources
• Better use of transmission corridors
• Opportunities to coordinate permitting
• Economies of scale and cost savings in the
  development and construction activities