A 65-mile direct-current power line, the Neptune Project, now connects Long Island with the power grid in Pennsylvania. The cable caries 660 megawatts and passes under the ocean floor. The cost was $600 million. The offshore wind proposal of Angus King would require the transmission of 5,000 megawatts through several hundred miles of ocean-floor cable. I hesitate to do the math.
Offshore wind
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