There have been no major interruptions to the North American electricity supply since the blackout of August 2003, at least on the same scale.

But that doesn’t mean there haven’t been plenty of “incidents,” as Bryan Singer calls them. We — the public — just haven’t heard about them.

It would seem logical, in this day and age, that critical infrastructure sites such as hydro utilities and other energy generation stations would be subject to terror concerns.

Most energy security professionals will tell you, however, that it’s domestic, day-to-day threats of vandalism, that are the greatest concern.