Let me fix that....
"And it will have its own dedicated Single Point of Failure with two links to the power grid for redundancy."
If you have 1 sub station, it doesn't matter HOW many links you have past that, if the sub station shits-itself-and-dies, then its a moot point. It would be better to have two small sub stations, on opposite sides of the building, each with 2 links to the outside world. THAT would be proper redundancy. I never said it was cheap, but it would be close to failsafe as you could get.
So really, to take out an entire data centre, you throw a firebomb into the sub station, and watch the sparks.....
Mines the one with the molotov cocktail in the pocket.....