The difference with a small island community running on disel is quite simple. The load can be shared when the wind blows as a combustion engine will come on line imedeatly. A coal plant can't do that. That's why you end up with grey and black outs. This makes the coal plant inificent. The problems lie as you can't produce wind on demand. And why then can't these wind frams produce there power and sell it them selfs at a rate that's fare to the Australian public. We have to subsidise the building then subsidised there output. Not a great bussiness model for the public. You can't do that with many other industry's. That's why we have the hugest power cost in the world.