This shows us just how strong the wind industry has become. It is real simple. Once built, these machines are paid of in twenty to thirty years and then keeping paying for decades after with a low nominal cost base.
Besides all that, it is all classical technology in the sense that we cut and shape metal and maintain it just as we build bridges. Imagine receiving dividends from the Brooklyn Bridge
These power sources will always, once paid for, be a hugely cheap source of energy.
Engineers race to design world's biggest offshore wind turbines
From the Guardian
Jul 27, 2010
British, American and Norwegian engineers are in a race to design and build the holy grail of wind turbines – giant, 10MW offshore machines twice the size and power of anything seen before – that could transform the globalenergy market because of their economies of scale.
[On Monday 26 July], a revolutionary British design that mimics a spinning sycamore leaf and which was inspired by floating oil platform technology, entered the race. Leading engineering firm Arup is to work with an academic consortium backed by blue-chip companies including Rolls-Royce, Shell and BP to create detailed designs for the "Aerogenerator", a machine that rotates on its axis and would stretch nearly 275m from blade tip to tip. It is thought that the first machines will be built in 2013–14 following two years of testing.
But the all-British team of designers and engineers, which includes Eden US Department of Energy's National Renewable Energy Laboratory, announced plans to build 10MW "Britannia" turbines in north-east England.
Based on a scaled-up version of the conventional wind turbines now common in the British landscape, these giants would be fixed to the sea bed but would stand nearly 600ft high above the waves. If they prove technically and financially feasible, each turbine should be able to generate enough electricity to provide 5,000–10,000 homes and, says Clipper, should create energy equivalent to 2m barrels of oil in their 25-year lifetime.
Meanwhile, Norwegian firm Sway is planning to build massive floating turbines that would stick straight out of the sea from 100m-deep floating "masts" anchored to the sea bed. An EU-sponsored research project is also investigating 8–10MW turbines, and other American and Danish companies are planning 9MW machines. Full-scale prototyes of all three leading designs are expected to be complete within three years.
"There is a wonderful race on. It's very tight and the prize is domination of the global offshore wind energy market," saidFeargal Brennan, head of offshore engineering at Cranfield University, where much of the Aerogenerator development work has been carried out.
"The UK
The largest wind turbines currently installed are mostly rated at around 3MW. By comparison, coal power stations typically have a capacity in gigawatts, or thousands of megawatts – it would take 180 of the new giant turbines to generate the equivalent capacity of a coal power station proposed this year for North Ayshire, Scotland.
Engineers say that scale is the key to wind power. Doubling the diameter of a conventional wind turbine theoretically produces four times as much power, but weighs eight times as much and can increase costs by a factor of eight. Offshore power is widely regarded as the future of renewable energy because the wind is much more reliable at sea, larger machines are possible to transport and install and there is far less public opposition.
On land, massive cranes and blades have to be driven to remote hilltops, and planning permission can take many years. However, the present generation of offshore turbines are 30–50% more expensive than their terrestrial counterparts, are harder to maintain and are more prone to corrosion.
The market for offshore power is expected to grow to hundreds of billions of dollars a year. Last year the European Wind Energy Association predicted that Europe would increase its offshore wind power from less than 2GW today to more than 150GW by 2030.
Britain, which has little upland space available for large wind farms, overtook Denmark in offshore wind generation in 2008and now leads the world with 330 offshore turbines installed. It also has the world's most ambitious plans to develop the wind resource, being committed to installing 12GW of offshore power by 2012. This is the equivalent of 2,500 of the largest 5MW machines presently developed.
John Sauven, director of Greenpeace UK, said: "It is critical that the UK
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