They've got a huge amount of space, solar has a low cost and provides an additional consumer to build out yet more capacity for supplying the world.

> Wouldn't it be better to just go with nuclear

If this is legit : https://world-nuclear.org/information-library/country-profil... then they have 59 reactors right now with 37 currently in production. Wikipedia lists 62 reactors being built in the world in total, and 28 of them being in China. The amount of power those additional plants will generate will take them from third in the world to second this year (wikipedia) and in total would pass the US when built.

They're not slouching on nuclear, they're ramping up energy production at an incredible pace on a lot of fronts.

Which leads to a shrinking nuclear share in their grid. It peaked at 4.6% in 2021, now down to 4.3%.

Compared to their renewable buildout the nuclear scheme is a token gesture to keep a nuclear industry alive if it would somehow end up delivering cheap electricity. And of course to enable their military ambitions.