Arizona Transmission System Overview November 18 2014 Tribal

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 Glen Canyon Crystal San Juan Navajo Ojo Taos Mead Mc. Cullough Market Place EVSG Victorville Eldorado California Devers Cholla Arizona Coronado Norton BA Mc. Kinley Blackwater West Mesa Lugo Mira Loma Four Corners Moenkopi Springerville Perkins Red Colorad Palo Bluff o River Verde Hub WW Rudd North Gila New Mexico Pinnacle Peak Liberty Browning Kyrene Saguaro 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 NM 500 k. V 345 k. V Web Sites West. Connect: http: //www. westconnect. com/ SWAT: http: //www. westconnect. com/planning_swat. php 3

SWAT in Relation to other Planning Regions 4

Difference between “Transmission” and “Distribution” • Generally, “transmission” means 100 k. V 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 k. V 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. 5

Major Arizona Transmission 6

Map of AZ Electric Companies http: //www. azcc. gov/divisions/utilities /electric. asp 7

Ownership of Transmission in Arizona • • • Arizona Public Service Salt River Project Southwest Transmission Cooperative Tucson Electric Power Western Area Power Administration – Desert Southwest Region 8

APS 9

APS 10

APS 11

SRP 12

13

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15

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SWTC Northern 17

SWTC Southern 18

SWTC Western 19

TEP 20

WAPA-DSW 21

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/ • Sun. Zia (2018) – http: //www. sunzia. net/ 22

Centennial West Clean Line 23

Harcuvar Transmission Project 24

Longview Energy Exchange 25

Southline 26

Southline (renewable resources map) 27

Sun. Zia 28

Sun. Zia (solar resources map) 29

Transmission Projects Under Development 30

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_ Path. Reports_Combined_FINAL. pdf • WECC Path Rating Catalog (non-public) 31

Maps of Existing and Future Transmission Projects • Arizona Utility Ten Year Plans and Biennial Transmission Assessment filings – http: //edocket. azcc. gov/Docket. Detail. Search? d ocket. Id=17769 • TEPPC – https: //www. wecc. biz/Transmission. Expansion. Plannin g/Pages/Project-Information-Portal 2. aspx • SWAT/West. Connect – http: //www. westconnect. com/documents_results. php? c ategoryid=83 32

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/Transmission. Expansion. Planning /Pages/Environmental-and-Cultural. Considerations. aspx 33

Questions or More Information About SWAT Patrick Harwood Western Area Power Administration harwood@wapa. gov 602 -605 -2883 34