All our big power transformers for the Grid are made in China.
Lucky for us most of our big power transformers are more than 20 years old... still I'm ever so sure the Chinese can figure out a way to take our grid down even if most transformers are analog... It's too bad we don't have a group of really smart people who could sit around and figure out how to protect the country...
Maybe like the Private Citizens Wall, we could do a go fund me page and come up with private money to pay people to help us protect ourselves from our countries enemies.