From the things I've read, the cause of the NYC blackout was someone inside ConEd facilities had used a physical device (USB drive most likely) to upload a virus to the electricity control systems. The reason it took 6 hours was because ConEd had to disconnect the computers and servers and replace them with unaffected units and reboot.How can IRAN cause US energy blackouts at will? I don't get it? It's not like they have their own ON / OFF switch
It's speculated there was a sleeper agent who is a ConEd employee who did the deed.
I just figure if there's any similar, large scale attack on the grid, it'll be this weekend due to extreme and dangerous heat.