I won't comment on whether or not this will work, but in bush Alaska that $1 per Kilowatt Hour is during the prosperous warm times when the fuel to run the diesel generators doesn't have be flow in because of pack ice or a fuel barge delayed because the Coast Guard is holding it for repairs. Now imagine sitting way out on the Aleutian chain where it blows like hell for long periods of time and barges ice over. I once had to wait, through a fuel rationing for a month, for fuel in the middle of winter. One year fuel had to be flown in to McGrath in the interior - gasoline was going for $12 a gallon. Last year, the a town along the inside passage (panhandle) froze over. They were without power for over a month because of the record snow.
Now, I don't know (don't care to fact check helium cost at the moment), but I would compare that to the cost of keeping communities from freezing to death.