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Sea Breeze Pacific Regional Transmission System

Juan de Fuca Cable & West Coast Cable Keys to West Coast Transmission Progress. Sea Breeze Pacific Regional Transmission System. BCTC system studies - Feasibility Completed - Combined Interconnection and Facilities studies agreement In negotiation

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Sea Breeze Pacific Regional Transmission System

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  1. Juan de Fuca Cable & West Coast Cable Keys to West Coast Transmission Progress Sea Breeze PacificRegional Transmission System

  2. BCTC system studies - Feasibility Completed - Combined Interconnection and Facilities studies agreement In negotiation BPA system studies - Feasibility Completed - Interconnection Completed - Facilities Completed WECC Path Rating Process - Phase II Target Date Q2 - 2007 Electrical System Studies

  3. Anticipated System Benefits • British Columbia: Improved Access to Market • Washington “I-5” Utilities: Relieved Congestion/ Downstream Benefits Return • Blaine Intertie: Increased Headroom (~300MW) Deferred Capital Expenditures(e.g. Monroe-Echo Lake $400M) • Regional Benefits: • Vancouver Island: Improved Reliability • Olympic Peninsula: Improved Reliability

  4. Access to Canadian Renewables

  5. Preliminary Plan of Service WCC • Basic Components of WCC • 1600 MW converter station at BPA’s Allston Substation. • 2-650 mile undersea DC cables (1 per pole) • Upgrades North of Allston • Rough Cost: $1.9 - 2.3 Billion, plus the cost of upgrades north of Allston

  6. Terminating OVHD HVDC with Large VSC Inverters • HVDC Inverter • Limitations on recovery rate from ac faults due to inverter voltage stability • Limitations on power rating due to system strength • Reactive power constraints • Momentary interruption of power flow due to ac fault induced CF at inverter • HVDC Light Inverter • Improved voltage stability • Less limitations on inverter rating, recovery rate and system strength • Improved multiple-infeed performance • No reactive power constraints • Distributed inverters to reduce interconnection requirements

  7. State-of-the-art enhancement of well proven HVDC transmission technology Photo courtesy of ABB

  8. West Coast Cable Project

  9. Summary We expect both the JdF and West Coast Cable Projects to provide significant benefits to the electrical system in the Puget Sound area and the larger Northwestern Region, as well as access to coastal BC renewable resources.

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