Oren wrote:
Video:

http://www.foxnews.com/on-air/americ...ylist_id=86909

It may even be worse.

The transformers at large sub-stations are one-offers. That is, they are
specifically made for the requirements of the specific sub-station - there
are no spares. Each transformer, moreover, can take up to two years from
design to delivery.

Someone once computed that taking out ten or so of these lightly secured,
big transformers, say by a terrorist group, could really screw up the
network grid in a fairly large area.