https://www.cleanenergywire.org/sites/default/files/styles/g...
If blockade from China will cut power after the 11 day storage runs out then your are out of power completely.
If blockade from China cuts 90% power after 11 days, then you still have power of emergency operation.
This is assuming that China would not be attacking the power plants in either scenario, which is reasonable given the premise that China wants to take over not destroy Taiwan.
> You can’t conquer a country by force without destroying it.
Citation neededI can think of plenty of conquests that did not result in the destruction of the invaded country. Instances all throughout WWI, WW2, Napoleon, Alexander the Great, and many more. You don't destroy the country because you want the country. You want the resources. Those resources include both the existing infrastructure and the existing people.