[thackney]

It will take at least 6 months to get new 500kV/230kV transformers from China as they are not made here anymore.

That is not a true statement. Large power transformers are still made in the US. Mexico is the significant competition in this market, not China.

[Travis McGee]

In an urban vs rural civil war, where cutting off electrical power was one tactic, rifle bullets would be cheaper and more plentiful than transformers.

[mikey_hates_everything]

If you're right then there's really no problem but this recent study doesn't instill a lot of confidence in domestic production, especially in a national emergency. 34% of our large power transformer imports are apparently Korean. Link