"Predicted to supply about 30% of our energy needs", - I can't image what the British Isles would look like to achieve this. Germany, particularly in the north, Schleswig-Holstein and Baltic areas are covered in these things. There is a total of 21,000 plus, of them, and they altogether are producing only 6.5% of the country's power requirement. So in this case, to benefit from a 30% contribution, over 100,000 units would be needed - unthinkable!