Todd Woody at the NY Times has had a couple of stories in the last few days on The Bloom Box, or Bloom Energy Server, a solid-oxide fuel cell designed as an on-site distributed generator. Present costs are still rather pricey - $7 to $8 capital cost per watt (or $7000-$8000/kW - I had this mixed up earlier - see this analysis from Jesse Jenkins for details) plus the cost of natural gas as fuel and any operational and maintenance costs (and they're only claiming a 10-year lifetime). Efficiency is quoted at 50 to 55%. Higher efficiency and lower capital costs would be essential to making it truly useful. Still, I find this a good step forward in the technology. Why?
Last year (2008) we were starting to look at alternatives to our oil-fired burner for heating our house. The house is an almost rectangular 35x60 ft ranch a little over 30 years old, and came with a 1000-gallon buried oil tank, no longer allowed in town codes, so we knew we had to at least get rid of that some time. We finally got that taken care of a few weeks ago. How we're going to heat our house this winter we're still not quite sure. Anyway... one of the interesting options then (and now) was a geothermal heat pump system, and we had several contractors come in and give us quotes. Not cheap at all, mainly because we would have to switch from baseboard radiators to forced air, and putting in the ductwork and vents would take a lot of labor. But there's a 30% federal credit available so we may still go that route.