there's no time to ramp up on solar unfortunately. solar requires a massive amount of area and should ideally also be built for purposes of reuse, as they do expire and need to be replaced.

there's not enough solar and batteries that exist today to capture the needed electricity. and we need energy today - not "sort of in the future" - or else there are likely to be mass deaths starting in 2050 or so when clean water is due to become an issue, assuming status quo until then (which is highly unlikely as well)