I made once an estimate that to power the whole energy( not power,current,ampere) of the world we need a surface of the sice of spain. And I took bad Sunlight into account. …. So I wonder why for most countries … why not go all in solar? Nuclear seems so much expensive and wastefull compared to solar.

I know there is the storage problem. But most energy is directly consumed or has to be stores for a short period . Heat for example. And heat is stored in water.