That timescale is also enough time for (global) battery production rate to reach multiple TWh of additional capacity each year, which may not seem like enough, but remember batteries only have to fill the gap when there is no wind at night while the hydroelectric reservoirs are low. I'm also expecting some hydrogen in there, not because it's great, but because it's so easy I made some myself when I was single-digit-years-old.
If you can make nuclear fast, cheap, and safe, then of course we should go for it, but the current ones, are only safe, as they are slow and expensive to build.
If you really want 100% renewables, not 90%, then yes, it becomes tricky, but here hydrogen provides a solution.
Of course you can use renewables for even 100% of your energy needs on a good day. But you will need either nuclear, hydro, coal or gas if you don't want interruptions.
Battery storage and hydrogen are not much solutions. From the article:
> To control these swings and provide reliable power, renewables advocates argue that battery storage and hydrogen can store electricity and dispatch it when solar and wind aren’t producing. Germany’s largest battery storage program is its home storage systems, but years of battery storage installations have barely made an impact on the German grid. The country currently has an estimated 435,000 homes equipped with battery storage systems of various capabilities, and 145,000 home storage systems were installed in 2021. But there are 40 million households in Germany, and home battery storage systems usually last only a few hours, while the grid needs storage that can support variations lasting weeks.