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APS Ten Year Transmission Plan 2014-2023
Arizona Corporation Commission 2014 Biennial Transmission Assessment
Jerry Dolyniuk
8th BTA Workshop #1
May 15, 2014
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Overview
• Description of APS’s filed 2014-2023 Transmission Plan
• Project changes from previous BTA
• RMR update
• Responses to preliminary questions
– Subregional and stakeholder involvement
– Transmission system adequacy
• Potential coal plant retirement
• September 8, 2011 event
• Increased penetration of variable energy resources
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Hassayampa-North Gila 500kV update
• Work is currently on schedule to be energized 6/1/15
– Foundations scheduled to be complete in September
– Structure assembly is in progress
– Wire stringing began in April
– Construction at North Gila substation will resume after summer season
– Construction work at Hassayampa Switchyard started in April
– Major equipment due to arrive fall 2014
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Progress - North Gila Substation
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Progress - Line
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2017
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2017
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2017
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2017
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Ocotillo Modernization Project Site Plan
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2017
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2017
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Changes from 2012 to 2014
Project Change in Status
7th BTA 8th BTA
Youngs Canyon 345/69kV substation In-service 12/9/13
Delaney-Palo Verde 500kV line 2013 2016
Delaney-Sun Valley 500kV line 2015 2016
Mazatzal 345/69kV substation 2015 2017
Bagdad 115kV line relocation 2014 2017
North Gila-Orchard (TS8) 230kV Line 2015 2018
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Changes from 2012 to 2014
Project Change in Status
7th BTA 8th BTA
Sun Valley-Trilby Wash 230kV line 2015 2016
Sun Valley-Morgan 500kV line 2016 2018
Pinal Central-Sundance 230kV line 2014 TBD
Desert Basin-Pinal Central 230kV line
2014 No longer participating
TS12 230/69kV substation 2021 Replaced
OMP 230kV Generator Interconnections
N/A 2017
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RMR Studies
• 7th BTA resulted in an ACC order to suspend RMR studies – Four factors established for restarting RMR studies
• Increase of load forecast by more than 2.5%
• Planned retirement (or expected long-term outage during summer) of transmission/substation
• Planned retirement (or expected long-term outage during summer) of a generating unit in an RMR area
• Significant customer outage in an RMR load pocket during summer months
• 8th BTA - APS analysis showed no triggering events have occurred that would require restarting a RMR study for Phoenix or Yuma load pockets
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Subregional & Stakeholders
• APS’s projects are included in Southwest Area Transmission (SWAT), WestConnect, and Transmission Expansion Planning Policy Committee (TEPPC) plans
• APS projects are modeled in all WECC cases
• Regional transmission projects are reviewed and studied within regional/subregional forums
• APS/SRP Joint Stakeholder meetings (FERC Order 890) – 6/20/2013 and 12/19/2013
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System Adequacy
• Coal Plant Retirement Analysis
– APS’s IRP considers a number of different scenarios
• Studies performed included the effects of retiring Four Corners Units 1-3
– SWAT recently established the Coal Reduction Assessment Task Force
• Evaluate the impact of coal retirements long-term and on a wider regional basis
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System Adequacy
• 9/8/2011 Take-Aways
– Increased situational awareness, cooperation and coordination
– Developing a wider view
• Neighboring systems are monitored for effects of outages to the APS system
• Determination of effects on APS system from outages on neighboring systems
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System Adequacy
• Variable Energy Resources
– Natural gas generation will become the energy source of choice
• Operational flexibility
– Cleaner energy mix
• Customer resources such as roof-top solar and energy efficiency projected to triple
– Advanced technology will change the electricity grid
• Communication and automation
• Integration of renewable energy
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Questions?
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