It's a plan and right now that's all it is... now lets see if they can get the funding for it! One other problem though, this plan is for cyber attacks not physical attacks by terrorist or some crazed group, it's not difficult to find the three main junctions to take down the whole grid and to attack them 3 points simultaneously. If you notice, the DARPA plan is not designed to bring power to the whole Country it is to restore power for the vital components of the infrastructure such as national defense/communications etc...