Very few people know how to go about microgenerating. Only a couple of electricity companies make it easy - it's one of the reasons I chose Good Energy (they have a pack n'everyfink). Granted, I currently have no means of doing it, but that's a trivium.

On a large scale, biomass doesn't scale up well, nor does hydro. Wind can. Tidal is like fusion, permanent Future Tech. I think it's pretty clear that the govt want to go towards nuclear + renewables.