The loss of power in 2003 was very wide in geographic scope, but the key is that it was very brief. Power was restored to the vast majority of customers within 48 hours.
If there were either a natural disaster or a man-made attack that caused outages of much longer duration, then we would be in a different world in terms of defence support to civil authorities. Then the requirements for the nation to have assistance would be much greater, and the difficulty of delivering that assistance for our military and civilian authorities would be enormously more severe. That's why the puzzle we're facing now is so much more challenging, and why the need for additional planning and building on the current foundations for collaboration are so important.