I fell on this topic while semi-idly browsing this morning. Very interesting topic. For one, I didn't know that fuel cell technology already reached mass production stage (and this is a shame for a chem.eng.). For two, at least on one (non-verified) estimate in the internet, the price for producing energy with fuel cells in home applications is already lower (6 cents/kW) than what I pay to Hydro Québec once I override the ridiculously meager baseline (think of Québec winters) — but not complaining here, our electricity prices are extremely low anyways. But what seems most interesting are a) means of selling electricity back to the grid in underuse periods and b) use in remote locations. Flip side (at least for me and for now), house has to be heated with water or air, not with electricity, for the promised efficiency to appear.