Storage will never work. Quote me on this.
Nuclear or a mix of nuclear and renewables will be the only way to seriously get away from fossil fuels.
Also, even if storage works some day, hoping we manage to discover how, scale and implement it across human civilization in time is a crazy bet to make. Even if we seriously go all in on nuclear and renewables tomorrow - it might already be too late, so betting on some miracle tech to be found, scaled and implemented in time is not only unwise, it would require several miracles to have any hope.
The storage plan for the EU is a mix of battery and hydrogen storage. It has a timeline that will take a while, but so does nuclear. There is a roadmap for converting europe’s gas transport and storage infrastructure over to hydrogen as part of the EU hydrogen strategy. I know there are people who don’t believe in the feasibility of the hydrogen strategy, but the people actually in the field working as experts seem to believe in it, so I remain unconvinced by the critics.
It already does work though, and it growing exponentially without any tedious political debates since just about anyone can do it at any time, at any cost and any scale. Companies store their own energy, counties store their own energy, private individuals store their own energy.
I see no way of stopping it unless corruption somehow manages to make private power production and storage illegal. There certainly are no technical or economical showstoppers.