Major Western Transmission Projects

Bob SmithDirector; Asset Management and Planning

Arizona Public Service Company

TransForum WestSan Diego, CAMay 6, 2014

Agenda

• APS Background

• APS Ten Year Transmission Plan

• Hassayampa – North Gila 500kV project

• Transmission Development within WestConnect

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APS Service Territories

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APS Service Statistics

• 11 counties

• 34,645 square miles CC&N area

• 1.1 million customers

• 424 substations

• 28,937 distribution line miles

• 5,434 transmission line miles

• 54 generation units

• Over 7200MW Peak load

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Youngs Canyon 345/69kV Substation (Dec. 2013)

Hassayampa-North Gila #2 500kV Line (2015)

Palo Verde-Delaney-Sun Valley 500kV Line (2016)

Mazatzal 345/69kV Substation (2017)

Morgan-Sun Valley 500kV Line (2018)

TS12 230/69kV Substation (2021)

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Palm Valley-Trilby Wash 230kV Line (2016)

Sun Valley-Trilby Wash 230kV Line (2016)

Scatter Wash 230/69kV Substation (2021)

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Hassayampa-North Gila 500kV

• By the Numbers– Line Miles

112– Tons of Lattice Steel 8,000– Tons of Tubular Steel 700– Miles of Cable

700– Cubic Yards of Concrete 5,000– Acres of Laydown Yards 100– Original Estimate $250M– Current Estimate $201M

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Progress - Material

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Progress - Substation

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Progress - Line

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WestConnect Planning Participants

Arizona Public Service Public Service New Mexico

Basin Electric Power Cooperative Sacramento Municipal Utility District

Black Hills Corporation Salt River Project

Colorado Springs Utilities Southwest Transmission Cooperative

El Paso Electric Transmission Agency of No. California

Imperial Irrigation District Tri-State G & T Association

Los Angeles Dept. of Water & Power Tucson Electric Power

NV Energy Western Area Power Administration

Platte River Power Authority Xcel Energy – Public Service Colorado

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Approximate WestConnect Planning Region

Current membership shown All entities are required to

sign the Planning Agreement to become a voting member

Footprint may change due to changes in membership

WAPA BHCSU PSCOPRPA BasinTSGT

WAPATSGTPNMBasin

EPE

WAPABHTSGTBasin

WAPASRPTEPAPSSWTC

Entities in blue text are public utility transmission providers that are required to comply with provisions contained within FERC Order 1000

WAPASMUDTANC

WAPANVE

WAPAIID

LADWP

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Western Interconnection

Regional Planning Entities

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2014 WestConnect Plan Summary

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Status of Projects No. Projects Total Miles Estimated Cost (B$)

Planned 199 6,418 $ 14.494

Conceptual 66 6,452 $ 12.085

2014 WestConnect Transmission Plan

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2014 WestConnect Transmission Plan

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2014 WestConnect Transmission Plan

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Major Transmission Projects in WestConnect

Name of Project Line Miles Voltage From To

Centennial West Clean Line 900 500 kV DC New Mexico California

Chinook Project 1000 500 kV DC Montana Nevada

Harcuvar Transmission Project 90 230 kV Arizona Arizona

High Plains Express Initiative 2500 500 kV Wyoming Arizona

Long View Energy Exchange 90 500 kV Arizona Arizona

Lucky Corridor Project 130 345 kV New Mexico New Mexico

North Gila – Imperial Valley #2 Project 85 500 kV Arizona California

Southline Transmission Project 240/120 345 kV/230 kV New Mexico Arizona

Southwest Intertie Project 339 500 kV Idaho Nevada

SunZia Southwest Transmission Project 500 500 kV New Mexico Arizona

TransWest Express 725 600 kV DC Wyoming Nevada

Tres Amigas Project 22 345 kV New Mexico New Mexico

Western Spirit Clean Line 200 345 kV New Mexico New Mexico

Wyoming-Colorado Intertie 180 345 kV Wyoming Colorado

Zephyr Project 950 500 kV DC Wyoming Nevada

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Questions?

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