Electricity Grid in U.S. Penetrated By Spies - WSJ.com

"Cyberspies have penetrated the U.S. electrical grid and left behind software programs that could be used to disrupt the system, according to current and former national-security officials.

The spies came from China, Russia and other countries, these officials said, and were believed to be on a mission to navigate the U.S. electrical system and its controls. The intruders haven't sought to damage the power grid or other key infrastructure, but officials warned they could try during a crisis or war.

'The Chinese have attempted to map our infrastructure, such as the electrical grid,' said a senior intelligence official. 'So have the Russians.'"