Windpower: nothing but hot air
The American Thinker makes a good case against windpower in a way which will not make T. Boone Pickens too happy:
"A typical large wind-driven turbine is rated at about 1,500 kilowatts. It's 350 feet tall and has a fan blade of about 240 feet in diameter. It will actually deliver about 375 kilowatts. It can power about 375 microwave ovens, or 6250 60-watt light bulbs simultaneously (only when the wind is blowing at about 25 miles per hour, which is a very strong wind). An average (1 gigawatt) power plant can power nearly a million microwaves, or 16 million light bulbs at the same time.
A power plant near me produces 1,100,000 kilowatts (1.1 gigawatts) of power. At a 25% capacity factor it would take nearly 2600 large wind turbines to produce the same power as this nuclear power plant. And this is not a particularly large plant.
If you placed these 2600 wind turbines the recommended 5 rotor-blade diameters apart, they would stretch for 600 miles. That's as far as the distance from Michigan to Georgia. In practice wind turbines are not placed single file, they are placed in several rows, like crops, in what are called wind farms, but you get the idea.
The amount of electricity generated by a wind turbine is proportional to the wind speed to the 3rd power (a 20 MPH wind will produce 8 times as much energy as a 10 MPH wind). Therefore wind turbines often produce energy in bursts; when the wind gusts, the energy output spikes, when the wind dies down, energy output dips.
Unfortunately, there is no easy way to store these bursts of energy for later use. There are no batteries large enough that are also practical, and pumped-storage systems, which use unwanted energy to pump water into an aboveground reservoir for later use in turning a water-driven generator, require a large body of water."
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1 comments:
The technology is increasing at a rapid pace. There are now turbines that produce (not rated at) 7+ megawatts, which would decrease the 2600 down to 157 or lower, which is a 94% decrease - impressive to say the least. Also, the new ones have inverters instead of synchronous generators, that is to say, a separate controller that converts the wild AC generated into something the grid can use. This means the rotor can run at more optimum and varied speeds. They generate power more efficiently, and provide longer service life with less wear (and fewer turbines).
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