Move Over Solar
Thursday, March 25th, 2010( There’s a New Kid in Town)
Fuel cells. Well over a century old, fuel cells have been an intriguing scientific anomaly to turn chemicals into electricity without combustion. In the past, the problem with fuel cells was the small amount of electricity generated for the size of the cell, the use of expensive platinum as a catalyst, and the reliance on hydrogen gas to react with oxygen in the air. And until fairly recently fossil fuels have been abundant and cheap, so the economic incentives to produce commercially viable fuel cells were not there. True, there are some busses in European cities that are powered by hydrogen fuel cells, but these are very expensive government subsidized vehicles.
Now all the problems that previously challenged commercial fuel cells appear to have changed. A startup company in Silicon Valley California has patented a new generation fuel cell that uses sand to create the wafer sandwich, surrounded by an anode and cathode, and either natural gas or methane from the local landfill to initiate the chemical reaction. The company, Bloom Energy, www.bloomenergy.com has taken their product past the test tube stage and has built working prototypes. Bloom Boxes, as they are dubbed, are now powering buildings at Wal Mart, EBay, Federal Express, Staples, Bank of America and Google. One box (about the size of a large refrigerator carton) generates about 100 kw, enough to power an average office building or 100 homes. Capital costs are recaptured in about seven years.
While fuel cells and solar energy share the common feature that they are both self-contained and hence do not require a transmission grid, there are many advantages of fuel cells over solar. Solar requires more space. Solar panels are generally placed on south or west facing roof surfaces, and due to space limitations, the typical solar installation provides about 25% to 30% of a homes’ electrical demand. A commercial building or an apartment, which have a higher ratio of occupied space to roof area, can only generate using solar a much smaller fraction of electrical demand. And of course, the sun has to be shining to produce solar electricity, so nights and cloudy days make the user dependent upon the conventional power grid. Fuel cells operate 24/7, and can supply 100% of a home’s electrical needs. True, the Bloom Energy fuel cells require either ethanol, natural gas or landfill methane to operate, but here is an ample supply of these alternatives in the USA and Canada.
K.R. Shridhar, the CEO of Bloom Energy, envisions a future where houses and commercial buildings have their own power supply in the back yard or campus. Centralized distribution of electrical power will become a thing of the past. It’s like having your own well for water.






