BBC News - Bigger wind farm buffer zones 'needed to protect some homes':
"Welsh government planning guidance says 500 metres should separate homes from wind turbines.Read the entire article at the BBC News site:
But the committee said that should be a minimum distance and in some circumstances - depending on the topography and ambient noise levels - the buffer zone should increase to 1,500 metres.
Although the landscape can shield people from sound, the report says one respondent living within 1km of a wind farm said the sound echoed off a nearby mountain into the valley where they lived.
In a report, the committee says faulty turbines should be switched off at night if they start making more noise."