Tuesday, January 25, 2011

Electricity from Fuel Cells

For a growing number of businesses, government subsidies and decreasing costs are making the technology cost-effective.

The new World Trade Center towers in New York City will be powered in part by fuel cells. Whole Foods runs some of its supermarkets on fuel cells. Walmart, eBay, Google, Staples, Coca-Cola, and many other major corporations have installed them in the last few years. Many of these companies say that they're not just using fuel cells to reduce energy consumption and pollution, provide reliable backup power, and attract good publicity. They also aim to save money.

Powering commercial buildings with fuel cells can cost hundreds of thousands or millions of dollars. They make the most sense for hospitals, banks, supermarkets, and companies with big data centers—businesses that require a reliable source of backup power and are willing to pay a premium. Backup generators are typically far less expensive than fuel cells: a natural-gas generator might cost 50 cents per watt of generating capacity, while fuel cells can cost over $7 per watt, says Sam Jaffe, a research manager at IDC Energy Insights. The problem is that in most places, local regulations limit the use of generators, so most of the time they're sitting idle. Fuel cells, which are quiet and clean, can run continuously, so companies can recover their investment more quickly. (The best natural-gas generators can also minimize emissions, and if regulations are modified to take this into account, fuel cells may lose their advantage, Jaffe says.) Fuel cells are particularly attractive for new buildings, which can be engineered to take advantage of the waste heat generated by the cells to provide hot water, heat the building, or cool it with the help of special chillers driven by heat or hot water. One supermarket in New York even uses heat from its fuel cells to keep its sidewalks free of ice. A well-designed fuel-cell system can use 90 percent of the energy in the fuel it consumes. By contrast, even the most efficient power plants are less than 60 percent efficient (and some coal plants are less than 40 percent efficient).

Source: Technology Review

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