Northern Ireland Electricity (NIE) said the blackout was caused by an issue with the high voltage transmission network.
It also wants any new high voltage transmission lines to avoid areas of outstanding natural beauty, national parks, world heritage sites and green belt land.
Higher-voltage transmission lines that have become more common in recent years are intrinsically more susceptible to upset, and those lines are largely concentrated in the manufacturing centers of the Midwest.
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Now there is growing concern that a really big storm might collapse much of the global electric grid, particularly in places with long high-voltage transmission lines such as Australia, Canada, China and the United States.
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The network of high-voltage "transmission" lines in the U.S. is rapidly aging and no longer can adequately support the country's growing demand for electricity.
It fell onto the main north-south high voltage power transmission line.
Transmission, especially long high-voltage lines that cross states, is extraordinarily hard to get approved, sited, permitted and paid for.
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That is the reason why the current emphasis in China is on the construction of 500kv extra-high-voltage lines and long-distance power transmission.
Large-scale electricity transmission usually uses alternating current, in which both current and voltage oscillate.
Midwest ISO, which supervises 94, 000 miles of high-voltage lines, is considering ways to spread the costs of new transmission beyond local ratepayers and taking part in preparing a broad plan for the eastern interconnection.
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