Small stuff.
Not really that small. Nickle is abundant and cheap, the Canadian shield is loaded with the stuff. One of the biggest problems with the Ballard hydrogen fuel cell generators is cost. A reduction of 75% of the cost makes this an efficient home heating and electricity supply. Imagine if every home generated it's own heat and electricity, the only plumbing needed being a waterline and sewer pipe. It would reduce the growing demand both for electrical powerline corridors, natural gas lines and powerplants, nuclear or otherwise.
Replacing existing home funaces with a ballard generator would be simple. It could revolutionize the whole energy industry, greatly reducing oil dependancy.
It's not far from reach if the cost of one of these things can be brought way down.