You can still go solar! You'll just need an off grid residential sized solar system. Check this out on Google Earth. Search for Joe Skeen Campground in El Malpais near Grants, New Mexico. For the campground host (only) the solar system consisted of 48, yes 48 - 240 watt photovoltaic panels, (+-32" x 62" each) 24 - 6 volt deep cycle batteries and 2 - 10,000 watt inverters. (one as a backup)
The campground host (in an older +-30' fiver) told me he regularly, reliably ran the rooftop AC in summer, and electrical resistance heating in winter, plus all the creature comforts he wanted(refrigerator, elec. water heater, consumer electronics, shop tools, microwave, coffee maker, etc.), no problem.
Now, . . . the cost for the system, . . . only the BLM knows for sure. My estimate is between $50,000 to $60,000, less if the government can give itself energy rebates. AND, the system stays put when the campground host leaves.
Chum lee