They've yet to deploy grid batteries at scale, afaik. While EVs are doing great in China (over 50% of sales), and V2G is active near term expected there, behind the meter batteries is always great for solar. It uses the transmission line at higher capacity including the possibility of reverse charging overnight for morning/cloudy next day power boost.

Inner Mongolia includes a lot of desert, and so future expansions with batteries should have plenty of available land to boost existing transmission utilization.

Overall, they've yet to announce climate goals representative of the pace of renewables/battery production that they have. They might not mind just replacing daytime use of coal, while ramping coal up at night instead of leveraging batteries that makes transmission much cheaper, and can easily beat coal prices during night only operation.