Several counties in central Washington have the cheapest power in the nation. Washington State, as a whole, has expensive power over in the Seattle metro area.
And if you're serious about a mining business, you already know what those counties are.
3 counties, to be specific - but only 2 for smaller mining setups, the third you have to get to the 200 KWH level to get to a competative rate with the SMALL BUSINESS rate for the other 2.
And as it happens, I relocated to one of those counties last summer....