The fact that the grid still works most of the time for most of the people doesn't proove that the grid is in good shape, in my point of view. Yes, it worked, and it still works. But the US missed to invest in its infrastructure - roads, bridges, water, just to name a few besides the grid - in the last couple of decades. This might be cheap on the short term, but it's going to be even more expensive in the future. The US has a critical investment deficite regarding its infrastructure, including the grid.
'In August 2003, the power failure that affected 50 million people in the United States and Canada was not caused by a single extraordinary event on a single system, but rather a series of routine events that quickly became unmanageable because of an aging electricity distribution system lacking redundancy. National laboratories and others that have evaluated the weak points in our energy infrastructure have identified similar scenarios where a seemingly modest, routine occurrence can cascade into a debilitating energy supply disruption in very short order.'
- http://www.energyxxi.org/pages/Blueprint_Modernize_and_Prote...