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Bloom Energy for every home?

No not quite yet at $700,000 a piece. But interesting development nonetheless

Extracts:

In The New York Times on Wednesday, I wrote about Bloom Energy, the once-secretive Silicon Valley start-up that has apparently made a big breakthrough in developing a fuel cell that can generate electricity at competitive prices while minimizing greenhouse gas emissions.

Bloom spent nearly a decade developing its fuel-cell technology while saying nary a word. Over the past year and a half, it has quietly sold and installed 100-kilowatt Bloom boxes at Google, Bank of America, Wal-Mart and other big companies. The boxes cost $700,000 to $800,000 apiece.

Making stuff, particularly solid-oxide fuel cells, is very hard work. Such fuel cells have been something of a holy grail as they can operate at extremely high temperatures to maximize efficiency and can use a variety of fuels, like natural gas and biogas. Since the heat allows the fuel to be directly transformed into electricity through an electrochemical process, the expensive precious metals and rare-earth elements used in other fuel cells to act as catalysts could theoretically be eliminated.

But finding cheap common materials as substitutes and ensuring fuel cells don’t crack and leak under such conditions have stymied scientists for more than 30 years.
...
ceramic wafer serves as an electrolyte, and as fuel passes over the cell and mixes with oxygen ions, the resulting reaction generates electricity. Each fuel cell generates 25 watts of electricity — a couple of years ago, it was 5 watts
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Last July, eBay flipped the switch on five Bloom Energy Servers that now supply 15 percent of the electricity at its San Jose, Calif., campus, or about five times as much energy as generated by its 3,248 solar panels
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One byproduct of fuel cells is water, and Bloom has patented and proved a fuel-cell design that could also tap electricity generated by solar panels and wind farms to electrolyze water to produce hydrogen that could be used as fuel in the cell.

“That’s the killer app,” said Mr. Sridhar, who said such a product probably would introduced within a decade.

Full article here: http://greeninc.blogs.nytimes.com/2010/02/24/a-secretive-start-up-raises...