Indicators of Transmission Path Congestion

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Indicators of Transmission Path Congestion

• 1. WSCC EHV Database Information
• 2. Usage Analysis from EHV Data
• 3. Maximum Path Loading Analysis from EHV Data
• 4. Scheduling Information from Providers
• 5. Internet Posting of Available Transmission
  Capacity on Providers OASIS Sites
• 6. Congestion Pricing Information from CAISO and
  Future RTOs

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Information Sources and Limitations

• WSCCs EHV Database
• Contains data on all major paths in the WI
• Historical data for Dec.1999 to present
• Contains hourly data for
• Capacity (MW) of major paths
• Actual power flow(MW) on each major path
• Net power scheduled (MW) on each major path
• Data is incomplete for some transmission paths
• Tension exists due to market sensitivity of some
  data

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Information Sources and Limitations

• OASIS (Internet Based) - Shows Each Providers
  assessment of unused path capacity (Available
  Transmission Capacity - ATC) calculated according
  to FERC rules. Also Contains a log of each
  reservation request by users. Limited ATC an
  indicator of limited transmission capacity
• Schedules - Individual schedule information is
  not available, aggregate data is available. Not
  all transmission usage is scheduled.
• Congestion Pricing information not yet available
  except in CA.

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Observations

• There is substantial data on the existing
  congestion in the western transmission system.
• While heavy loading of the Transmission system
  points to the need for system reinforcement, a
  comprehensive analysis of all data is necessary
  to determine the economics of system
  reinforcement versus other alternative solutions.
• Lack of data deemed market sensitive may make
  comprehensive analysis more difficult.

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Information Sources and Next Steps

• The July 2000 Biennial Transmission Plan
  documents transmission congestion during 1999.
• Transmission congestion during 2000 is currently
  being analyzed.
• Data must be available for further analysis and
  support of modeling efforts.