If I understand the above calculation correctly, it would seem that, in the
electricity sector, we could mostly concentrate on meeting additional
demand with efficiency and carbon neutral generation (and avoid some of the fights associated with replacing existing coal generation plants); but if we need to reduce emissions by 80 % by 2050, then I am not sure
whether this makes sense.
WWF say that going beyond 60 % depends on
whether there's a market in other countries for the excess
electricity the UK would generate at times of high renewable production / low
demand.