Pacific DC Intertie (1970)
The Bonneville Power Administration and Los Angeles Department of Water and Power completed an 846-mile, 3,100 megawatt direct-current line carrying Columbia River hydropower to Southern California.
It eased California's summer peaking strain and gave the Pacific Northwest a market for surplus hydro.
It set the template for trans-regional power exchange in the West, the backbone of the region's grid economics for five decades.
SWIP-North is the modern version of the same trade: surplus power where it's generated (Idaho wind) moving to where demand is (California), with return capacity for Desert Southwest power.
