Are we any closer to solving seasonal storage at high latitudes? I guess solar is taking the slack out of marginal power production, but relies on fossil fuels

Are we any closer to solving seasonal storage at high latitudes? I guess solar is taking the slack out of marginal power production, but relies on fossil fuels or nuclear to fill the gaps. My personal gripe with renewables is that, except for some geographies, it is unlikely we can run the whole economy on renewables due to storage issues, at which point you can't make any more progress with renewables. You would then need nuclear to decarbonize further, by which point you may just as well have built nuclear in the first place.