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WSCC High Voltage Transmission

Discover how power flows through the Southern Interties with high-voltage DC and AC lines connecting the Pacific Northwest and California. Explore the changes in power sales and generation patterns from 1998 to 2000.

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WSCC High Voltage Transmission

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  1. Legend +500 kV dc 500 kV 345-360 kV 230-287 kV WSCC High Voltage Transmission

  2. Southern Interties • Power is moved between the Pacific Northwest and California over what BPA calls the Southern Interties • This includes 3 high voltage AC transmission lines connecting Northern California with the Pacific Northwest • It also includes 1 high voltage DC line that connects Southern California with the heart of the Pacific Northwest near The Dalles dam

  3. Average Power Flows to CA

  4. Actual Power Flows on Southern Interties

  5. Actual Power Sales • 1998 was a “near normal” water year in the Pacific Northwest • Actual power sales to CA were only 211 average MW less in 2000 than in 1998 • The monthly pattern of hydro generation was substantially different in 2000 • This pattern created an early runoff followed by below normal flows

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