Blackout a reminder of power-grid vulnerabilities

Blackout a reminder of power-grid vulnerabilities: "A blackout that swept across parts of the Southwest and Mexico apparently began with a single utility worker and a minor repair job.

Power out for millions

How it then rippled from that worker in the Arizona desert, to southern California and across the border, plunging millions of people into darkness, has authorities and experts puzzled, especially since the power grid is built to withstand such mishaps."

'via Blog this'