http://www.aip.org/tip/INPHFA/vol-9/iss-5/p8.html

Very long, read it all...

Excerpt:

"The conditions that caused the August 14th blackout remain in place. In fact, the number of TLRs and the extent of frequency instability remained high after August 14 until September’s cool weather reduced stress on the grid. What can be done to prevent a repetition next summer?"

Upshot: Blackouts will be wider spread and last longer.