Arizona Transmission System
Overview
November 18, 2014
Tribal Solar Working Group
1
What is SWAT?
• Southwest Area Transmission (SWAT) is a voluntary
and open study group comprised of regulators,
governmental entities, transmission users,
transmission owners, transmission operators,
environmental entities, and other stakeholders.
• The goal of SWAT is to promote collaborative
regional transmission planning in the Desert
Southwest.
• http://www.westconnect.com/planning_swat.php
2
SWAT Subcommittee Footprints
SWAT
Colorado
Utah
Nevada
Shiprock
Harry
Allen
McCullough
Victorville
Eldorado
Taos
Four
Corners
Cholla
Arizona
Coronado
Norton
BA
McKinley
Blackwater
West Mesa
Lugo
Devers
Ojo
Moenkopi
California
Mira Loma
San Juan
Navajo
Mead
Market Place
EVSG
Glen
Canyon
Crystal
Springerville
Perkins
Red
Colorado Palo
Bluff
Verde
River
Hub
WW
Browning
Kyrene
Saguaro
North Gila
New
Mexico
Pinnacle
Peak
Rudd
Liberty
Sandia
Silver
King
Greenlee
Winchester
Tortolita
Amrad
Hidalgo
Luna
Afton
Artesia
Arroyo
South
Vail
AZ
SWAT
AZ
NM
EVSG
Diablo
Southwest Area Transmission
Arizona Transmission System
New Mexico Transmission
Eldorado Valley Study Group
Footprint wide work groups: Short Circuit, Transmission Corridor, California
Interface, Coal Reduction Assessment Task Force
Newman
Caliente
500kV
345kV
NM
Web Sites
WestConnect: http://www.westconnect.com/
SWAT: http://www.westconnect.com/planning_swat.php
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SWAT in
Relation to
other Planning
Regions
4
Difference between “Transmission” and
“Distribution”
• Generally, “transmission” means 100 kV or
greater. It is the power system used for wholesale
transactions, and interconnection is regulated by
the Federal Energy Regulatory Commission.
• “Distribution” is generally less than 100 kV and
interconnection rules are often defined by state,
local utility, or Tribe.
• This presentation only focuses on the
transmission level, but distribution level projects
are still important to the entire grid.
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Major
Arizona
Transmission
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Map of AZ
Electric
Companies
http://www.azcc.gov/divisions/utilities
/electric.asp
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Ownership of Transmission in Arizona
•
•
•
•
•
Arizona Public Service
Salt River Project
Southwest Transmission Cooperative
Tucson Electric Power
Western Area Power Administration – Desert
Southwest Region
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APS
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APS
10
APS
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SRP
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13
14
15
16
SWTC
Northern
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SWTC
Southern
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SWTC
Western
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TEP
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WAPA-DSW
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Some Developer Transmission Projects
• Centennial West Clean Line (2020)
– http://www.centennialwestcleanline.com/site/home
• Harcuvar Transmission Project (TBD)
• Long View Energy Exchange (2021)
– http://longviewee.com/
• Southline (2017)
– http://www.southlinetransmissionproject.com/
• SunZia (2018)
– http://www.sunzia.net/
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Centennial West Clean Line
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Harcuvar Transmission Project
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Longview Energy Exchange
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Southline
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Southline (renewable resources map)
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SunZia
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SunZia (solar resources map)
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Transmission Projects Under Development
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WECC Paths
http://www.wiebgridtracker.com/
• The flows on some transmission lines
interact with one another, and they are
grouped together as “paths.”
Congestion on these paths can be a
considerable limitation on the ability to
move power between regions of the
grid. In Arizona, major paths are:
• Path 22 (Southwest of Four
Corners), Path 23 (Four Corners),
Path 50 (Cholla to Pinnacle Peak),
Path 51 (Southern Navajo), Path 54
(Coronado to Silverking) – Limit
flows from coal resource areas to
central Arizona
• Path 49, East of the Colorado River
- Limits exports to California
• Path Reports:
https://www.wecc.biz/Reliability/TAS_P
athReports_Combined_FINAL.pdf
• WECC Path Rating Catalog (non-public)
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Maps of Existing and Future
Transmission Projects
• Arizona Utility Ten Year Plans and Biennial
Transmission Assessment filings
– http://edocket.azcc.gov/Docket/DocketDetailSearch?d
ocketId=17769
• TEPPC
– https://www.wecc.biz/TransmissionExpansionPlanning
/Pages/Project-Information-Portal2.aspx
• SWAT/WestConnect
– http://www.westconnect.com/documents_results.php?c
ategoryid=83
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Land Resource Maps for Development of
New Generation and Transmission
• US Bureau of Land Management,
Arizona Office
– http://www.blm.gov/az/st/en/prog/energy/arra_solar.ht
ml
• Open Energy Information
– http://en.openei.org/wiki/Gateway:Transmission
• TEPPC Environmental Data Viewer
– https://www.wecc.biz/TransmissionExpansionPlanning/
Pages/Environmental-and-CulturalConsiderations.aspx
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Questions or More Information About
SWAT
Patrick Harwood
Western Area Power Administration
harwood@wapa.gov
602-605-2883
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