Power grids existed long before networked-computers came out. Why
> would the grid be so vulnerable now?
See below.
Shouldn't those critical networks be isolated from outside access > altogether?
You'd think so.
Secondly, they should be more worried about grid overloads from all
> the power source shifting done today. The grids were not designed to
> handle that kind of loads and problems like the recent NYC-NE
> blackout will occur again.
Exactly. The links between utilities were designed as backup, not the primary source of power. But that's what they've become, and they haven't been reengineered to match.
R's,
John