[reitzensteinm]

But this document does not. Note it says 12.5%, not 12,5%.

1 TWh on the scale of a country is very little - a 1 GW nuclear plant operating continuously would generate over 8 TWh a year.

Nevertheless the back of the napkin math of land requirements for solar check out, so it was probably just a typo and OP meant to say PWh.

[lxgr]

Yeah, seems like I got a wire/SI prefix crossed there. The land use should fit in terms of orders of magnitude, though.