Wikipedia tells me that high voltage lines transmitting 1GW at normal grid voltages will have losses of about 1% over a distance of 100 miles, which is honestly

Wikipedia tells me that high voltage lines transmitting 1GW at normal grid voltages will have losses of about 1% over a distance of 100 miles, which is honestly quite a lot. That's 100kW per mile. Oregon is only a couple hundred miles across, so it's feasible, but with more losses than I thought when I looked it up to answer you.