That's not to mention using hydroelectric reservoirs from dams to store energy, which is absolutely fundamental in the mainstream "100% renewable" plans you may have heard of. For example, a lot of Green New Deal stuff largely draws from Mark Jacobsen (the Stanford prof who sued the scientists who published a critique of his plan in 2017). His plan depends on increasing hydroelectric capacity by something like 10x in the USA (albeit, he claims, just by adding turbines to existing dams, though that may be a challenge).