Solar and wind energy are impossible without stable energy sources like coal or fission. Solar and wind energy are highly volatile, and battery energy storage is far too expensive.
You already said that, and you're ignoring the fact that many countries are switching from coal and nuclear to renewables, thanks in part to the rapidly falling prices.
This is irrelevant to what we were discussing originally. Neither the UK nor any other country does have battery storage of the size of major power plants. Those are required to provide stable energy. Otherwise the power would go out during calm or in the night.