The electric or electrical power transmission or "high voltage electric transmission" is the bulk transfer of electrical energy, from generating plants to substations located near a denser population of people. Transmission lines, once they are connected to each other, become high voltage. Using an AC current, typically this type of energy can not be contained. So a sophisticated system is used to match supply with demand exactly. Otherwise, without this system in place there would be disaster. Transmission can either be overhead transmission or underground transmission. The Continental U.S. power transmission grid consists of regarding 300000 km of lines operated by nearly 500 companies. Transmission networks are more complex. One draw back to a widely connected grid is the chance of cascading failure and widespread power outage.
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