Having a look at gridwatch.co.uk now and then is very telling.<p>Electricity generation is mostly gas and coal has been reactivated. As I'm typing coal supplies 4% of electricity, wind 3%.<p>We're hitting a key issues with renewables like solar and wind. This is winter in the UK, we're not going to get a lot out of solar and if we hit a calm patch (there's been little wind lately) we're pretty much screwed.