After a 60 Minutes piece on Sunday, it’s fair to say that Bloom Energy owns the cleantech buzz this week. Already, there have been some interesting theories surrounding the secret ingredient that makes the Bloom Box run. Also, it’s been revealed that Google has been using the company’s fuel cell, but not for its data center. Why not? In Google’s experience, the power plant has an availability rating of 98 percent, missing the “four nines”-plus (99.99 percent uptime) mark so sought after by the industry. Also, each Bloom Box only provides a small fraction of power required by a major corporate data center. At $700,000 to $800,000 a pop, a Bloom Box-powered facility can turn into a pricey proposition for already costly builds and retrofits.