arizona transmission system overview november 18, 2014 tribal solar working group 1
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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
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SWAT Subcommittee Footprints
Arizona
Nevada
California
Utah Colorado
NewMexico
SWAT
NMAZ
Saguaro
Rudd
SWAT Southwest Area TransmissionAZ Arizona Transmission SystemNM New Mexico TransmissionEVSG Eldorado Valley Study Group
Footprint wide work groups: Short Circuit, Transmission Corridor, California Interface, Coal Reduction Assessment Task Force
500kV 345kV
Web SitesWestConnect: http://www.westconnect.com/
SWAT: http://www.westconnect.com/planning_swat.php
Browning
Kyrene
PinnaclePeak
McKinley
Springerville
SilverKing
Greenlee
Tortolita
W W
Luna
Coronado
ChollaMoenkopi
SouthVail
Hidalgo
Diablo
Afton
CalienteNewman
Arroyo
AmradArtesia
Blackwater
BA
TaosOjo
San Juan
FourCorners
West Mesa
GlenCanyon
Mead
Crystal
Shiprock
Navajo
Devers
PaloVerdeHub
Perkins
Liberty
North Gila
Norton
Sandia
Winchester
Market Place
McCullough
Eldorado
Mira Loma Colorado River
Red Bluff
Lugo
EVSGVictorville
Harry Allen
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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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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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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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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_PathReports_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?docketId=17769
• TEPPC– https://
www.wecc.biz/TransmissionExpansionPlanning/Pages/Project-Information-Portal2.aspx
• SWAT/WestConnect– http://
www.westconnect.com/documents_results.php?categoryid=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.html
• Open Energy Information– http://en.openei.org/wiki/Gateway:Transmission
• TEPPC Environmental Data Viewer– https://
www.wecc.biz/TransmissionExpansionPlanning/Pages/Environmental-and-Cultural-Considerations.aspx
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