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background, blue, cable, circuit, crisis, current, danger, distribution, efficiency, electric, electrical, electricity, energy, energy crisis, engineering, environment, equipment, generation, generator, high, industrial, industry, infrastructure, insulator, lack of energy, line, lines, metal, plant, pole, power, pylon, sky, small, station, steel, structure, substation, supply, system, technology, tower, transformer, transmission, volt, voltage, volts, watt, wire,