I have not seen a place that won't have back up power. At Laverendrye Lodge no power at night a few years ago but they set me up with a deep cycle battery and inverter. They now have solar for overnight so no problem. Everywhere i have stayed has had power as lots of folks travel with their machines.
At my camp i use a dewalt power pack that i just leave plugged in so it charges when generator is running and will power cpap all night even with humidifier running on machine and generator gets shut off for the night.