Wind farm efficiency queried by John Muir Trust study - BBC

Wind farms are much less efficient than claimed, producing below 10% of capacity for more than a third of the time, according to a new report.

The analysis also suggested output was low during the times of highest demand.

The report, supported by conservation charity the John Muir Trust, concluded turbines "cannot be relied upon" to produce significant levels of power generation.

Read the whole story

Scottish Natural Heritage Policy on Siting Wind Turbines

This is an excellent guide on the siting and designing of Wind Turbines. It makes the point that inappropriate siting of Wind Turbines will reduce public support for the technology and will hamper efforts to meet renewables targets.

http://www.snh.gov.uk/docs/A317537.pdf

Customers face huge bill for wind farms that don't work in the cold - Tom McGhie, Daily Mail

The failure of Britain’s wind farms to produce electricity in the extreme cold will cost billions of pounds, create an economic crisis and lead to blackouts, leading industrialists have warned.

To cover up the ineffectiveness of wind farms the Government will be forced to build emergency back-up power plants, the cost of which will be paid by industry and consumers.

Jeremy Nicholson, director of the Energy Intensive Users Group, which represents major companies employing hundreds of thousands of workers in the steel, glass, pottery, paper and chemical industries, said the failure of wind power had profound implications.

He was speaking after new figures showed that during the latest cold snap wind turbines produced less than two per cent of the nation’s electricity. 

Now Mr Nicholson predicts that the Government will encourage power companies to build billions of pounds worth of standby power stations in case of further prolonged wind failures.

And the cost of the standby generation will be paid for by industry and households through higher bills – which could double by 2020.

Industry regulator Ofgem has already calculated that the cost of achieving sustainable energy targets – set by Brussels but backed by the British Government – will amount to £200 billion, which will mean that annual household fuel bills will double to about  £2,400 on average within the next ten years.

In the last quarter ending December 23, wind turbines produced on average 8.6 per cent of our electricity, but the moment the latest bad weather arrived with snow and freezing temperatures, this figure fell to as low as 1.8 per cent.

The slack was immediately taken up by efficient, but dirty, coal-fired power stations and oil-fired plants.

‘What is so worrying is that these sort of figures are not a one off,’ said Mr Nicholson. ‘It was exactly the same last January and February when high pressure brought freezing cold temperatures, snow and no wind.’

In fact last year, the failure of wind power to produce electricity was even more profound.

Then, over a few days, the lack of wind meant that only 0.2 per cent of a possible five per cent of the UK’s energy was generated by wind turbines.

So little energy was generated then that the National Grid, which is responsible for balancing supply and demand of energy in the UK, was forced to ask its biggest users – industry – to ration supplies.

Read more: http://www.dailymail.co.uk/news/article-1345439/Customers-face-huge-wind-farms-dont-work-cold.html#ixzz1ISWaAwpc

How do bats die at Wind Turbine sites?

Power-generating wind turbines have long been recognized as a potentially life-threatening hazard for birds. But at most wind facilities, bats actually die in much greater numbers. Now, researchers reporting in Current Biology, a Cell Press journal know why.


Film of the threats to bats

Ninety percent of the bats they examined after death showed signs of internal hemorrhaging consistent with trauma from the sudden drop in air pressure (a condition known as barotrauma) at turbine blades. Only about half of the bats showed any evidence of direct contact with the blades.

"Because bats can detect objects with echolocation, they seldom collide with man-made structures," said Erin Baerwald of the University of Calgary in Canada. "An atmospheric-pressure drop at wind-turbine blades is an undetectable—and potentially unforeseeable—hazard for bats, thus partially explaining the large number of bat fatalities at these specific structures.

"Given that bats are more susceptible to barotrauma than birds, and that bat fatalities at wind turbines far outnumber bird fatalities at most sites, wildlife fatalities at wind turbines are now a bat issue, not a bird issue."