I'f I remember correctly, you could power the entire US with solar plants in a fraction of the Nevada desert and Europe from the Sahara desert.
https://www.inverse.com/article/3423...-power-the-usa
Solar panels in the sense of ones that produce energy directly, aren't even the best method. If you just use mirrors to heat oil in pipes and then use that heat to generate energy, you can also store some of the heat in sand tanks for use at night, without requiring lots of batteries.
For europe, there was/is the idea of Desertec
https://en.wikipedia.org/wiki/Desertec, this also includes a map for how much space you need to supply the world, Europe, etc (in 2005, but there is plenty of space for growth). The biggest issue appears to be finance because capitalists probably don't expect too many returns from energy that is basically available for free in the long term or just shy away from the huge investment in the beginning if they already have plenty of profitable power plants...
The idea to power Europe from the Sahara desert already existed before WW1, but was shafted during the war, when oil became the fuel of choice due to convenience in wartime...
The only thing stopping us in the end is the will to actually do it.
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