For any command post or incident command post, electricity is a given commodity that is required for operation. Most remote sites run on generators and to do that, they will need fuel.
One alternative that is becoming more viable is the use of trailer-mounted solar panels, such as NexGen's solar-powered trailers.
For now, I don't see these totally replacing gas- or diesel-powered generators, but they could become another tool in the toolbox for remote sites in "sunshine states" that could power remote communications installations when commercial power fails.
Just another alternative for you to consider.