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Applicant outlines 100‑mile Cascade Renewable Transmission Project: 1,100 MW mostly underwater HVDC cable
Summary
PowerBridge and partners described a roughly 100‑mile transmission link from The Dalles to Portland — about 80 miles underwater — using HVDC technology with 1,100 MW capacity, converter stations and seasonal in‑water construction windows; the proposal drew technical, tribal and environmental questions at an FSEC informational and land‑use hearing.
PowerBridge and project partners presented the Cascade Renewable Transmission Project on the evening the Energy Facility Site Evaluation Council (FSEC) held a public informational hearing in Stevenson, Washington. The company said the line would run roughly 100 miles from the Big Eddy substation near The Dalles, Ore., to a converter station in the Rivergate industrial area of Portland. "It is about 100 miles in length, of which about 80 is underwater," an applicant representative said.
The applicant described the proposal as a high‑voltage direct‑current (HVDC) cable buried roughly 10 to 15 feet beneath river sediment for much of its route, with converter stations at each end to change alternating…
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