Power outages in NYC brought about more than just life in a cold dark house, it also meant people had no way to charge their phones. And our phones these days are lifelines to the world beyond. Some folks in Brooklyn are able to charge their phones with camp stoves made by a company called BioLite. The BioLite people set up a charging station on the street and let people charge their devices.
The link has a photo of the camp stoves charging. The BioLite camp stoves are powered by fire which does something with air to produce a small amount of electricity which in turn will charge. Not only that, but these small things will also cook a small meal and power up LED lights. You want to do this outdoors, however.
On some level it seems like a smart idea to have one of these in the garage or basement, just in case.