Agreed - this was an attack on our infrastructure. In either case it was done by parties swearing allegiance to an evil god (either a crazed islamic god, or a god of greed).
The anomalous part of the attack is the timing. It was done at night, in the middle of April. The best possible time to allow for minimum disruption of power and repairs before peak power usages. If it were meant to hurt the country, it should have been in July.
They might have tossed a couple of emergency flares into the substation to set the coolant on fire, likely making the transformers non-repairable.
Also, only one power substation was hit. If they had hit two or more simultaneously in July, very likely the whole of Southern California would have been out of power for a month.