Gorman, Siobhan. "Alert on Hacker Power Play." The Wall Street Journal, February 21, 2012.
From the article: "The director of the National Security Agency has warned that the hacking group Anonymous could have the ability within the next year or two to bring about a limited power outage through a cyberattack. Gen. Keith Alexander, the director, provided his assessment in meetings at the White House and in other private sessions, according to people familiar with the gatherings. While he hasn't publicly expressed his concerns about the potential for Anonymous to disrupt power supplies, he has warned publicly about an emerging ability by cyberattackers to disable or even damage computer networks." Read more (subscription may be required)
See Also
Estes, Adam Clark. "The Future of Hacking Sounds Pretty Ridiculous." The Atlantic Wire, February 21, 2012.
Netburn, Deborah. "Anonymous' Flash Mob Targets Wall Street Journal's Facebook Pages." The Los Angeles Times, February 21, 2012.