Would you agree that for quite a few countries/regions in the world, there's a large seasonal fluctuation in renewable electricity generation which cannot easil

Would you agree that for quite a few countries/regions in the world, there's a large seasonal fluctuation in renewable electricity generation which cannot easily be met with seasonally fluctuating demand? As countries/regions try to get to 100 % renewable electricity they'll likely have to massively over build, leaving them with huge seasonal surpluses. If so, then wouldn't the conclusion be that there needs to be seasonal storage of energy to _some_ degree at least? If so, then do you think such seasonal storage can be achieved with batteries? I doubt that. I'd rather envision hydrogen as seasonal storage from fluctuating renewable generation. When/if the hydrogen is available, uses will likely follow.