During many hurricanes and floods many relief origination make trips to disasters, with many supplies are needed to help take care of victims of the devastation. These volunteers set up centers with lights powered by a Diesel Generator because there is no power in the area. It's necessary to have an ample supply of these things and many times there is a shortage. These teams, go out and try to help with the needs and make available as many things as they can offer. They are limited to the amount the units can carry and where they are going. If the areas are hard to access then they are limited to the amount of supplies they can get into the regional area. Many times a Diesel Generator will have to be air lifted, by helicopters and planes. A Diesel Generator can be affordable and setup in no time, to bring a form of stability to a horrific situation.
I'm sure there are time when you need to get emergency power to your tractor, if you are a farmer. This website offers a Pto generator that you can use to get that emergency during such times.
It is always nice to have lights at a campsite, and a generator would be great for that purpose. You can purchase a Towable Diesel Generator which would be very convenient on trips to areas with no electricity.