Interactive maps of UK renewable electricity generating sites are published by the Department of Energy and Climate Change and RenewableUK. I've had a go at creating a slightly different style of interactive map with the DECC data, with circles sized in proportion to electricity generating capacity.
You can view one type of generation at a time by hovering over the legend. The north-south differences (for example in wind, hydro and solar generation) are striking but not completely surprising given the differences in climate and landscape.
The map uses D3 and Leaflet, and the code is based on this page by Mike Bostock.