if the average bill really does top £4500pa I could imagine riots. it is the kind of thing you normally see happening at the start of some post apocalyptic film just before the brownstuff hits the fan.
the only saving grace could be it may be a reality check for the nimby people who don't want wind generation in their local area. I would have supported it anyway as I think they look great and are necessary but surely a few of these around the outskirts of all towns in fields will put a dent in it (and provide well paid employment building them?)
storage of excess electricity will obviously be an issue as well. pumping water up hill will only do so much in some areas, batteries are expensive
(grid scale)
I have seen some interesting solutions for home "heat" batteries. essentially just a giant insulated stone block which off peak electricity heats up for use when needed, but grid scale surely this will be where hydrogen comes in.
hydrogen as an energy store is not great when your energy is coming from gas, but when it's from excess wind or solar the. it seems fantastic to me (note I am a biologist not an electrical engineer so feel free to tell me I am wrong )
2 other techs being worked on that I know of
sand storage (heat the sand, drop hot sand to power turbines, feed cold sand back into silos to heat when more excess energy available)
compressing normal air. So compress the air when excess energy into storage tanks, use the compressed air to drive turbines when needed
both more commercial solutions but ideal to put the compressed air alongside solar/wind farms
actually was a 3rd for offshore. Giant water bags under pressure, so pump them up when excess and allow them to reverse drive the pumps/turbines when needed
end result will be many techs best suited to the space/environment I suspect