So back onto the renewables, National Grid's green forecast which shows some economic growth suggests 30GW of wind power generation by 2020.
That's TEN times the current output, but still less than 30% of the total. That is an awful lot of wind turbines. And don't forget that the generators get a guaranteed rate, so it certainly isn't going to be too cheap to meter!
We're faced with a rather unhappy set of choices. That's why I'm open to reconsidering nuclear, though if fusion showed any signs of progress that would help. I've visited Culham a fair few times, and success seems decades away still.