In the UK low winter PV production is something like 5% of summer peak production. That means you would need to 20x overprovision solar in winter, plus you hav

In the UK low winter PV production is something like 5% of summer peak production. That means you would need to 20x overprovision solar in winter, plus you have a massive problem that you have 20x overgeneration in summer months (what do you do with all that energy?). Battery storage doesn't help with this, as you'd need an absolutely enormous amount of storage to net off summer production with winter usage, and the batteries would basically be full for months then ran down in winter, to never be charged again until summer, so probably one cycle a year. UK has good wind resource and does generate a lot through that, but it also tends to be less on very cold winter days (when power requirement is at its peak). Overall I think the best option right now for the UK is something like 50% PV/wind, 25% nuclear baseload and the rest natural gas peaking plants. Even this would be very expensive, the peaking plants will be turned on and off a lot (high maintenance costs) and sitting idle probably throughout the entire summer.