Rivnuts from Homestead,PA on 8/4/2021 7:09:24 PM:
First of alll there are no outlets at any of the Hiker/Biker trail side campsites along the C&O that I am aware of. Electrical outlets are available There are outlets on the Meyersdale Maple Festival stage. There is one or more outdoor receptacles on the Service Building at the Connellsville trail side camp site. The KOA in Adelaide near Connellsville has electrical sites. While I know there are indoor outlets at the Husky Haven Camp office in Rockwood, I expect there are some outdoor receptacles there as well. But note that office is not in the campgrounds however.
These are some of the ones I know of. A more stealthy , but less savory, option is to look for outdoor receptacles on service stations, convenience stores, parks, banks, etc.
I’m sure others will know of still more options.