Wind turbines "last for half as long as previously thought" as study shows they show signs of wearing out after just 12 years

Wind turbines 'last for half as long as previously thought' as study shows they show signs of wearing out after just 12 yearsStudy of almost 3,000 turbines in Britain sheds doubt on manufacturers claims that they generate clean energy for up to 25 yearsThe research will fuel criticism of wind farms | UPDATED: 16:49 GMT, 30 December 2012 Wind farms have just half the useful lifespan which has been claimed, according to new research which found they start to wear out after just 12 years.