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BPAT/TOT TMT Discussion – Agenda

BPAT/TOT TMT Discussion – Agenda. Introduction Tracy Rolstad, Technical Operations, TBL Transmission System Use Planning, Operations, Marketing Philosophy Cutplane Map Implications West of Hatwai discussion. Different Needs and Uses of Transmission System.

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BPAT/TOT TMT Discussion – Agenda

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  1. BPAT/TOT TMT Discussion – Agenda • Introduction • Tracy Rolstad, Technical Operations, TBL • Transmission System Use • Planning, Operations, Marketing • Philosophy • Cutplane Map • Implications • West of Hatwai discussion

  2. Different Needs and Uses of Transmission System • System Planning, System Operations, and Marketing all review transmission system use and commitments to advance organizational responsibilities. • Organizational Perspectives: • Planning: Longer term view of entire system needs; makes assumptions about lines and equipment in/out of system configuration. Gives view of system capacity for reliability. • System Operations: Determines OTC and tracks the actual operations. Considers reliability standards and manages system operating risk. Operates the system to an N-1 or N-2 condition based on current system status (which may be an N-5 condition from a planning viewpoint). • Marketing: Uses operating capability of the system to determine ATC and market transmission capacity while assuring both product quality and fiduciary responsibility.

  3. Philosophy • The BPA transmission system is planned, designed, constructed, and operated to insure cost-effective reliability of service. Cost-effectiveness is viewed from the perspective of the electricity consumer. The system is planned to have sufficient strength or capacity to maintain continuity and quality of service to electrical loads during certain more common contingencies or system disturbances. For other less common contingencies, it is not economical to provide enough capacity to maintain full service, so interruption of service or some reduction of quality of service is allowed. • BPA Reliability Criteria for System Planning

  4. Interties and NW Cutplanes

  5. West of Hatwai • TBL’s firm ATC across this cutplane is zero. • Construction has begun on the Bell-Grand Coulee 500kV line which alleviates the congestion on this cutplane (completed by Jan 2005). • TBL has had a scheduling procedure in place since 2001 for managing West of Hatwai. • Late spring/early summer • Curtailment “season”

  6. West of Hatwai Curtailments • Applied in a pro-rata fashion by contract right and use • Resources affected: • Libby, Dworshak, Hungry Horse, Albeni Falls • Load netting comes into play • Influenced by activities at Coulee and Chief Joe • Avista west bound schedules • NWE westbound schedules (that cross WOH—i.e. Colstrip) • Curtailments not always caused by BPA

  7. Example Curtailment • Avista is replacing the Libby-Noxon #1 230 kV circuit breaker (PCB-316) • Forces out the Libby-Noxon line from 27 Oct to 14 Nov 03 (continuous outage) • This outage limits Libby generation • Outage period was chosen by AVA and BPAT for minimum impact on generation

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