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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
RPCG – CCTA Process
Vijay Satyal & Colby JohnsonReliability Planning & System Adequacy
April 28, 2015
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
RPCG
• Update from Chair/Vice-Chair
• Purpose – Soliciting input on - potential transmission projects
with probability of being in-service in the next 10 years
– Assist with best-estimates on transmission topology
– Stakeholder driven to reflect diversity of views
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
CCTA Process • Critical for WECC interconnection-wide planning
• Criteria-driven process (quantitative & subjective)
• Stakeholder input before submittal to TAS
• Valuable for future planning for Regional Planning Groups
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
Why is this valuable?
• Inaccurate data/assumptions on transmission projects
• Inconsistency in modeling assumptions
• Potential under/over-estimation of transmission utilization/congestion levels
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
2024 CCTA Process
• February 2013: 2024 CCTA process initiated
• May 2013: Project sponsors requested to update information in the WECC Project Information Portal (PIP)
• March – September 2013: Develop and revise 2024 CCTA
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
2024 CCTA Process Results
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
2026 Common Case Development Timeline (Tentative)
2026 Common
Case
Tentative: 2025 HS
Powerflow
2026 CCTA
2026 Load Forecast
----------March----------April----------May----------June----------July----------August----------
2025 HS Powerflow 2026 CCTA 2026 Load Forecast
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
Today
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec2015
Project KickoffIn-person meeting
CCTA Process Kickoff
Update Project Portal
Develop and Revise CCTA Assumptions
Aug 15 Sep 15Final CCTA review
2026 Common Case Kickoff
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
2024 CCTA Selection Process
Project Screening and Selection Process
2024 Common Case Transmission Assumptions
Regional significance
Project Development
Indicators
RPCG 10-year plans
WECC Project Information Portal (PIP)
2024 CCTA
Information Gathering Process
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
2024 CCTA Process and Selection
RPCG
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
2024 CCTA Criteria• Criteria 1: Regional Significance
• Based on Voltage: greater than or equal to 500kV or 345kV; greater than or equal to 200kV if backbone element (e.g., eastern edge of Western Interconnection)
• Criteria 2: Construction Status• Is the project currently under construction?
• Criteria 3: Financial Indicators• Financial questions added to project survey to indicate if the project has financial commitment
• Criteria 4: Implementation Status Indicators• Environmental Impact Status (EIS – if required) questions added to survey
• Criteria 5: Project Dependency• Is this project dependent upon another transmission project to be completed and used for its
intended purpose? If so, did the dependent project pass the CCTA criteria?
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W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
Questions/Discussion
• Continue with same process as before?• Add/Update?– Other metrics for review
• Better way to do things?– Flexibility in process improvement – Timeliness– Replicability
W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L
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Vijay A Satyal – Sr. Energy Policy Analyst, Reliability Planning vsatyal@wecc.biz
Colby Johnson – Associate Engineer, System Adequacy
cjohnson@wecc.biz
Thank you & Questions?
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