Thursday, February 17, 2011

The Failure of Wind Power


Wind power in northern New Brunswick has been shut down for weeks due to freezing cold. Just when the people of the province most need the power from the expensive turbines, they are frozen solid!
FREDERICTON — A $200-million wind farm in northern New Brunswick is frozen solid, cutting off a potential supply of renewable energy for NB Power.

The 25-kilometre stretch of wind turbines, located 70 kilometres northwest of Bathurst, N.B. has been completely shutdown for several weeks due to heavy ice covering the blades...GDF SUEZ Energy, the company that owns and operates the site, is working to return the windmills to working order, a spokeswoman says.

...Wintery conditions also temporarily shutdown the site last winter, just months after its completion. Some or all of the turbines were offline for several days, with "particularly severe icing" blamed.

The accumulated ice alters the aerodynamics of the blades, rendering them ineffective as airfoils. The added weight further immobilizes the structures.

Vitek says workers are trying to find a way to prevent ice buildup from occurring again in the future. The shutdown has not had any effect on employment at the site, which provides 12 permanent jobs. _GlobalMontreal.com_via_WUWT
Obama's regime -- and faux environmentalists around the globe -- have been gung ho over big wind power farms for years now. And every time anyone takes a close look at the economics and the details of wind energy, they come back to the same fact -- wind doesn't work.
The operating characteristics of turbine and generator mean that only a small part of wind energy can be captured.

Wind power is also intermittent, unreliable and hard to predict. Therefore large backup or storage systems are required. This adds to the capital and operating costs and increases the instability of the network. Wind farms are uniformly hated by neighbours and will not be willingly accepted without heavy compensation payments. Their noise, flicker, fire risk and disturbing effect on domestic and wild animals are well documented.

The wind is free but wind power is far from it. Its cost is far above all conventional methods of generating electricity. Either taxpayers or consumers will pay this bill.

...Electric generators achieve maximum efficiency at their design capacity. This is planned to suit the "average" wind speed, and the generator produces maximum safe output at this speed. If the wind drops, so does the power generated. If the wind rises, the energy generated is limited to the design capacity of the generator (by varying the pitch of the blades) and at some point the generator is shut down to prevent burnout. So the generator cuts off all the high-energy infrequent wind, in order to capture the maximum energy from the winds expected by the turbine designers at that location. These unavoidable operating characteristics of the turbine also reduce the power generated.

...Wind energy promoters usually quote the maximum attainable output as the capacity of the wind farm. This is the maximum power that could be produced if ideal winds blew all the time at all turbines (the 100% level in the figure above). However, this needs to be multiplied by the "capacity factor" to get the actual power likely to be generated. Because of the variable winds and the energy unable to be captured by the generator, the capacity factor lies in the range 25% - 35%. However it can be much lower. UK offshore wind rarely exceeds 20%.

In summary, wind power is very dilute and it takes a huge area of land to collect significant quantities of energy. Then vagaries of the wind mean that only a small proportion of the wind energy can be captured by the blades. Then only a proportion of this energy is converted by the electrical generator into electrical energy.

...In the recent frigid snap in Britain end 2011, when power demand was at a record high, the average power generation from Britain’s wind developments – the majority of which are in Scotland – was just about 11% of the total possible of 2,430 MW. On 30 Dec 2010 UK's 3,000 operational wind turbines produced only 0.04% of the country’s power. There were days when the contribution from Scotland's forests of wind turbines was precisely nothing. At times it was even worse than that. As the temperature fell to record lows, the wind turbines had to be heated to prevent them seizing up. So, at a time when all Britain needed every bit of power, the wind industry was using more electricity than it generated.

...Depending on the vagaries of the weather, wind power produces anything from zero to 100% of design capacity. This change can come in a short time and affect large areas of land. Therefore, to maintain grid stability and the ability to supply customer demand for continuous electricity, every wind farm has to have a backup generating facility for 100% of the wind capacity, and this backup must be able to swing into production immediately.

It is even worse than that. Suppose a wind farm is producing an average of 50 MW, but varying from zero to 100 MW. The backup has to be able to handle both changes, namely a drop of 50 MW and an increase of 50 MW. So basically, you have to have 100 MW capacity on spinning reserve, but running at 50% so that you can increase or decrease power by 50 MW. So the backup facility has to have TWICE the real rated capacity of the wind farm. Imagine what this does to the capital, operating and maintenance costs if the power company is forced to include wind power in its inventory.

Only hydro power and gas have the ability to sit idle until needed and then swing into production swiftly. Coal and nuclear could do it but at great cost – all fired up, idling, using fuel, but not producing saleable electricity. Even for gas or hydro, a backup facility incurs the full additional capital cost which has to be recovered from a lower output of electricity. Any sensible person would say "If we have to spend all that capital to build a gas/hydro power plant, why not use the reliable plant full time and forget about the costly, intermittent and un-predictable power from wind towers?"

The unreliable Danish wind farms only survive because they call on hydro power from Norway and Sweden to step in at short notice when wind fails. Then they sell excess wind power produced at times of low demand back into the Scandinavian grid.

...A wind tower is a massive industrial plant. Each turbine requires a foundation of almost 1,500 tonnes of concrete and a base of about 5 acres. Each structure stands nearly 200 metres tall and they could be as close as 140 metres apart. UK has a plan to generate 30% of its electricity from renewables by 2020. For wind power to do this would require about 15,700 wind towers. At 140 metres apart, they would stretch from the north of Scotland to the south of Spain.

...And it is unsafe anywhere near them. Lumps of ice, burning embers, and broken blades get slung off and towers collapse. In one case, a broken blade was flung through the window of a house over 5 km away.

...Danish electricity consumers pay higher prices than any other Europeans. And well before they could repay the initial capital, the wind towers are reaching the end of their life and will need to be replaced. Not one coal power plant has been replaced by wind power. It is doubtful if all this community pain and suffering has reduced carbon dioxide emissions. It has certainly caused no measurable improvement to global climate and has brought great environmental damage and human worry. The sorry story of wind power in Denmark is mirrored in Spain, Hawaii and California.

... _Why Wind Won't Work PDF_ via_ WattsupWithThat?!?!

If you want to understand the modern clusterfuck of big wind power, read the PDF document linked above, together with John Droz' presentation on wind power, Ted Rockwell's Energy Facts PDF, and David MacKay's Without Hot Air.

Such documents changed the minds of Al Fin energy analysts about big wind, as you will see if you go back far enough in the archives. Al Fin engineers particularly hate the idea of placing fine machines out in the elements to be tortured and destroyed long before their time. This has been particularly true of offshore wind installations, where fine turbines and gearboxes are exposed to salty spray, wind, and the constant inertial stresses of wind, wave, and storm.

Clearly President Obama and former Vice President Albert Gore are both world class dunces, besides both having won the Nobel Peace Prize. They are also corrupt, team-playing dunces who will end up personally benefiting in the hundreds of millions of US$, at the least, for their destructive influence on economies, energy supplies, and R&D budgets.

Portions of the above article was published earlier at Al Fin



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