Scotsman: SCOTLAND’S wind farms have produced only around half the amount of power they were expected to this year, Scotland on Sunday has learned. The government blamed the low generation levels on unusually calm weather, but critics said the figures showed the danger of becoming too dependent on renewable energy. Turbines are expected to operate at an average output of about 30 per cent of their maximum installed capacity. But the average output over five months this year was 17 …