Someone did some calculations here:
http://www.reddit.com/r/technology/comments/b62fl/bloom_energy_data_sheet_anyone_else_do_the_calcs/
The operation costs including amortization can be as high as 38 cent per kWhr and even more if you include maintenance.
Running costs (gas) only 5 to 8 cents per kWhr, so basically it heavily depends on the price of the box and how much it will be used. I am not sure how much profitable it can be at the target cost of 3k usd (after a number of years), but it does not seem groundbreaking.
