It sounds like many Federal and State parks are putting more and more restrictions on generator hours. My guess it is because of the noise and not because of global warming or depleting non-renewable energy(oil).
My solution would be to make them more quiet and/or have 3 different areas for camping.
Plug in electric sites
Generator sites
Non-generator sites
We were camping at Catalina State park in the middle of March last year and because it was full most of the time, we were put in overflow. When we arrived the weather was cool and wet for Tucson. I think there had been snow only a few weeks before.The nights always cooled down a fair bit.
In the evening we like to be outside and we noticed so many people running their gennys but were not outside. They were eating supper, watching tv etc. We had to listen to the noise of their generators and as we were packed like sardines in this overflow parking lot, a generator could be less than 10' away. One day an older C drove up next to us and fired up his on board genny and the exhaust was close to where we were sitting. It was so loud it was rocking our TC.
Oh course he never went outside. All of the gennies shut off at 8:00. Luckily he found a spot next day in the none powered part of the campground where the sites are much bigger but we had to listen to that noise for 3 hours and no one was running their A/C as the evening temps were in the 50's so these gennys were there just to keep their batteries up. I doubt if any of the RV's running gennys had solar.
One week later we were at the Lost Dutchman SP and stayed in overflow for a week and I don't remember 1 genny being run. What a different experience.
Dave