DHS Concerned over Threats to Electrical Grid

DHS: Attacks on power grid could involve network and data system hacks

President George W. Bush's top telecommunications advisers concluded years ago that an organization such as a foreign intelligence service or a well-funded terror group "could conduct a structured attack on the electric power grid electronically, with a high degree of anonymity, and without having to set foot in the target nation."

The Idaho National Laboratory - which produced the new video - has described the risk ominously as "the invisible threat."