An interesting article from the Clean Energy Authority shows that solar-powered generators are quickly becoming popular since super storm Sandy left thousands without power for weeks in 2012.
Several companies have said that mobile solar generators are a great solution. A "trailer of solar panels and batteries offers a solid backup source of power that, depending on the model, can serve as a command center in the aftermath of a disaster like Sandy."
Mobile solar generators can have multiple uses including emergency backup energy. Some companies are even marketing them for outdoor renting companies for festivals and concerts.
Source: Clean Energy Authority