What a mess.
I've seen sites moving away from Diesel because of this. Seeing more LPG. I was at a site late last year that was off the grid like this one. A pair of really large LPG tanks, looked to be 10,000 gallons each, on site, designed to make it through the winter without needing to be refueled.
Another large site I was at a while back had a fairly substantial solar farm attached, as well as about 25,000 gallons of LPG as a fall back. Pretty big site, too.
It's getting impressive what they can do with solar, T.E.G.'s, LPG, etc.