Please lookup a product from IBM called Datapower, nobody has been able to hack a Datapower device to this date, nobody even knows what type of operating system it is running, if you actually try to open the box unplugged it has a battery to wipe the os clean. the only way to do hardware replacement on the box is to ship it back to IBM and they replace it for you. typical box costs about 40k and you need 30 to 40 of them for a basic configuration. The energy grid is level 3 security which essentially puts it above credit card systems and health care systems because it is a war time target. Please stop watching TV.

Actually I would be of no help to anyone regarding that system, my design is well understood by many security experts and locked down like a mother fuckers, basically you have one Datapower device acting as a security gateway in the DMZ, with another DataPower device acting as a mediation service inside a trusted zone. there is mutual authentication setup between the two devices. All requests must be strongly typed and registered in a product called IBM Webspehre Service Registry and Repository ... it's a bad ass architecture that's all I can tell you and to this day it has not been hacked. Southern California Edison go ahead make my day and try to hack them. They can use some free pen testing.