I didn’t know there were propane generators. I’m going to look into that.
Most gasoline generators can be easily modified to run on either propan or natural gas. I did it to ours in about 2 hours.
I wrote a thread about it a couple of years ago:
http://www.freerepublic.com/focus/f-bloggers/2913038/posts
L
I bought and installed a conversion kit. It will do gasoline or propane at the 'flip-of-a-switch'. Cost=$247.00. See here.
Gas usually stays on when power lines only are affected, at least around here. Maybe not in earthquake areas