Energy officials in America have been concerned for some time that the country's electric grid could be vulnerable to sabotage.
The grid is made up of three systems serving different areas of the country....
In the past small glitches, including trees hitting transmission lines, has wrought havoc on the system, resulting in widespread blackouts.
In 2003, 50 million people in eastern states and parts of Canada were left without power for days after a similar minor incident.
Concerns also focus on the fact many of the most important parts of the network are out in the open, often in remote locations, protected by little more than cameras and high fences.
Transmission power stations, like Metcalf, are vital to the grid, making it possible for electricity to move the vast distances needed to serve the entire country.
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