Co Tyrone wind turbine collapse cause identified

A blade control system has been blamed for the destruction of a 100-metre wind turbine near Fintona in County Tyrone.
The turbine collapsed during light winds on Friday 2 January, scattering debris more than 250 metres away on the Screggah windfarm on Murley mountain.
People in the area said the rotor blades were spinning out of control on the evening the turbine buckled.
The sound of the failing mechanical structure was heard more than seven miles away.
Some people said the sound was like thunder. Others report grinding and the sound of metal against metal.
Another seven turbines – valued at £2M each – were shut down while an investigation was carried out by the supplier, Nordex.
The company said the windfarm generated enough power to meet the electricity demand of nearly 11,927 homes on an annual basis.
The remaining turbines will be switched back on on Saturday 14 February.