Florida Looks to the Sea for Energy

Land-based turbines have proved to be deadly for migratory birds, a fact that few scientists anticipated, so will the same thing happen in the oceans? Skemp said the only evidence they have at this point comes from sea captains in the area who claim that "fish aren't stupid" and will swim around a turbine instead of trying to swim through it.

But nobody knows yet if they are right.

The Florida consortium, which includes the University of Florida, Florida State University, University of Central Florida, and the University of South Florida, is actually part of a larger international group that includes researchers and institutions in the United Kingdom. Skemp said England is ahead of the U.S. in understanding tidal forces, and information-sharing agreements are in place between the two countries. And the United States is in a good position to exploit the Gulf Stream.

"We have about 20 percent of the total energy of the Gulf Stream," off the coast of Florida, she said. The stream is actually two rivers, one underwater consisting of cold water flowing south from the Arctic, and a surface "river" which is the warmer Gulf Stream flowing north.

A number of previous efforts to tap into various ocean currents failed partly because the currents are spread so widely that it would require a prohibitively huge system to collect enough energy to be useful. But the Gulf Stream is concentrated off Florida, and does not meander much, so it may be easier to harness. Off the coast of North Carolina, for example, the stream widens out, so, although there is more water flowing past the Carolinas, it is spread over a much wider area.

Since the flow is more concentrated off Florida, the water moves past more quickly, at speeds up to four knots, like a river passing through a narrow gorge. And there's one major advantage over land-based wind farms: The water flows at a fairly constant speed, day and night, rain or shine, windy or calm.

The energy is there 24 hours a day, seven days a week, 365 days a year, Skemp said.

If the first efforts succeed, there may be another resource waiting in the stream. Due to the cold currents from the north, and the warm currents from the south, there is a substantial temperature differential which may someday also be converted into electricity, although that technology is still a bit immature. But, at the least, it should be possible to tap into the cold water and pipe it ashore to cool Florida's buildings, further reducing the dependence on greenhouse gases.

However, Skemp warns that this is still an embryonic industry, and it simply may not work, but she's optimistic.

"It's very exciting," she said. And it's a homecoming for her. She was born just off of what is now the Boca Raton campus of Florida Atlantic University, where she earned her degree in mechanical engineering. She spent years in the aerospace industry before returning to Florida.

"Once you get some sand in your shoes, it's hard to leave," she said. But she would probably love to flush that sand out with the warm waters of the Gulf Stream, harnessed at last.

Lee Dye is a former science writer for the Los Angeles Times. He now lives in Juneau, Alaska.

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