Well a lot of companies, especially ones that have mission-vital servers, already have battery/generator back ups.
We haven't seen much call for it, because electricity has been fairly cheap, generating sources have been "fossil-fuel" based, and such fuel cells are still a rather new technology.
As that changes, so will the way we build/use large buildings.
A good market-based strategy for this is for utilities to really ramp-up peak power charges, as is already being done in some places. This more closely matches how much it costs to generate the extra "peak" power.
If you can draw less power during peaks by using power that you drew overnight during the non-peak period, then it becomes economically viable to have some sort of storage system.
Economically viable= commercially viable.
I am seriously considering starting a company that does these kinds of retro-fitting and new buildings projects. It would be a LOT of fun, and a good idea to get in on the ground floor with a business in what WILL be a growth industry.
Heh, if I do so then you can bet I will get a uva lot more preachy about it.
