Arizona ACC Biennial Transmission Assessment Navajo Transmission Project Update

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Arizona ACC Biennial Transmission
AssessmentNavajo Transmission Project Update

• May 22, 2008
• Presentation by Ben Hoisington
• Project Administrator, DPA

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Navajo Transmission Project (NTP)Project
Description

• The NTP will be a 500 kV transmission line
  extending from a new substation located near the
  Four Corners Power Plant in northwestern New
  Mexico to the Marketplace Substation south of
  Boulder City, Nevada. The approximate length of
  the line will be 478 miles.
• The project will be constructed in phases with
  Segment 1 will begin construction in 2009 and be
  in service in 2011. Segments 2 and 3 will
  follow, schedule not yet determined.
• Segment 1 198 mile 500 kV single circuit
  transmission line.
• Segment 2 62 mile 500 kV single circuit
  transmission line from Red Mesa West site to
  Moenkopi II site. Generally parallels an
  existing 345 kV transmission line.
• Segment 3 218 mile 500 kV single circuit
  transmission line from Moenkopi II site to
  Marketplace. Generally parallels an existing 500
  kV transmission line.

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NTP Project Segment 1 Summary

• A new 198-mile 500 kV line from the Desert Rock
  Power Plant to Red Mesa East with an
  interconnection at Four Corners
• Anticipated Path Rating 1,600 MW
• Estimated Direct Construction Costs 350 million
• RFQ for EPC contractor issued in 2007
• RFP for EPC contractor will be issued in August
  2008

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NTP Environmental Status

• EIS Record of Decision - issued, 1997
• State of Arizona CEC - issued, 2000
• Navajo Nation Right-of-Way Grant - issued, 2002
• Updated Biological and Cultural Studies are
  completed in 2006
• BLM has prepared a new draft Record of Decision
• Final ROD expected in June 2008

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NTP Project Segment 1 Summary

• WECC path rating process will begin in January 06
  
• Comprehensive Progress Report issued December
  2007
• WECC Regional Planning report issued in March
  2007
• Final WECC Path rating is expected in 2008
• In service date is scheduled for Q4 2011

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Navajo Transmission Project Location
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NTP - Major Facilities

• Desert Rock Energy Project - Red Mesa East 500 kV
  line
• A new 198-mile, 500 kV transmission line will be
  constructed between the new DREP 500 kV switching
  station to the new Red Mesa East 500 kV switching
  station. Conductor will be double-bundled 2156
  kcm Bluebird and the line will be series
  compensated at the DREP switchyard. Tentative
  size of the series capacitor is 45 ohm with a
  minimum rating of 2200 A continuous. In
  addition, the line will have two shunt reactors
  (one at each terminal) rated for 154 Mvar _at_ 500
  kV. Metering point for NTP 1 will be the DREP
  terminal.
• RME 500 kV Switching Station.
• The DREP-RME 500 kV line will terminate at a new
  500 kV ring bus which will include a fold-in of
  the existing Navajo-Moenkopi 500 kV line.
  Location of the new switchyard is approximately
  14 miles south of the Navajo Generation Station.