No they have 14 days of coal reserves.

They have generators which are becoming much more widespread in use by factories who keep suffering from unannounced electricity outages.

But the industrial generator market is also now very expensive in China due to the high demand. The video in the OP talks about this, it's actually a very interesting and informational video, you should give it a watch.

They felt forced to cut off trade with Australia because Australia wanted to investigate the Wuhan origins of covid 19, which was a quick and rash decision seemingly made in haste. However this geopolitical decision is now affecting their economy more deeply than anticipated, the longer they sustain this stance. It's a complex situation.