This could be the wave (no pun intended) of the future. Millennium Cell will introduce, later this year, a generator that is activated by water. This would be great during a blackout, or to take on that camping trip.

“The 22-­centimeter-tall generator weighs about two kilograms with an unactivated fuel cartridge. Add water, plug in a device, and the system pumps sodium borohydride solution over a catalyst, freeing hydrogen to power the cell.”

via technologyreview