Being a "sparky", I don;t need powerplants, all I need is access from FAR away to large substations which are only protected by standard chain link fences. All those transformers tied into grids, take one out, the grid shuts itself down,....
Power companies have been reluctant to upgrade electrical substations due to costs, while new residential, commercial strip malls, and industrial demand, keep tapping into it.
Their's the California "brown outs" that happen due to excess demand. Similar grids in the North East.... One could put Manhatten, Long Island and a large portion of New Jersey, PA, and Delaware, IN THE DARK!!!
Don;t even need a .50 BMG witg AP rounds.
Disclaimer, I would NEVER do this, just pointing out the vulnerabilities that Homeland Security, and Janet from another planet, Napolitano, nor her predecessors have addressed.
That would cause several millions of people to simply become "offline" and in the dark....