From The Telegraph of London:
"The technology can generate electricity in water flowing at a rate of less
than one knot - about one mile an hour - meaning it could operate on most
waterways and sea beds around the globe.
Existing technologies which use
water power, relying on the action of waves, tides or faster currents created by
dams, are far more limited in where they can be used, and also cause greater
obstructions when they are built in rivers or the sea. Turbines and water mills
need an average current of five or six knots to operate efficiently, while most
of the earth's currents are slower than three knots.
The new device, which
has been inspired by the way fish swim, consists of a system of cylinders
positioned horizontal to the water flow and attached to springs.
As water
flows past, the cylinder creates vortices, which push and pull the cylinder up
and down. The mechanical energy in the vibrations is then converted into
electricity."
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