Well a much publicised yearly report commissioned by Drax (UK's largest coal and biomass station) this week from Imperial College and sourced from Nat Grid thought otherwise.
Who's most up to date or accurate? Given the steady drop of fossil capacity, perhaps electricitymap that seems to be volunteer run simply hasn't caught up yet?
There's over a 5GW difference in amount of installed wind power between that site and the "over 20GW" claimed in the Imperial report. Solar varies by a similar percentage.
There have been other reports on the same lines throughout this year of the dropping off of fossil and rise of renewables, for both generation and capacity. Even with the distraction of fracking and changes to feed in tariffs.
That's the maximum net generating capacity, but you can't just turn it on, it generates what it generates based on the wind/sun.
If you want to see a live breakdown of power generation to the UK grid it's here http://gridwatch.co.uk/
