Implementaion rate for solar is low but growing fast everywhere, but China is leading in production, deployment and generation beating the USA and EU combined.

> China was responsible for about 38% of solar PV generation growth in 2021, thanks to large capacity additions in 2020 and 2021. The second largest generation growth (17% share of the total) was recorded in the United States, and third largest in the European Union (10%).

China doesn't have a great geography for solar. Towards the East, it's either too humid or too far North to reap the full benefits of solar panel, and out West there aren't the population centres to make big differences.

So yeah, I'm guessing it's mostly to sell to countries with better sar geographies, especially the US and Australia.