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USA Solar storm buffets Earth: How protected is the US power grid?

Peak impact of the solar storm was expected Tuesday. Only a few of the strongest storms have a serious impact, but modern society is more dependent on power grids than ever.

NASA/AP

Power-grid operators nationwide are on high alert Tuesday as gale-force geomagnetic winds from a solar storm sweep across the Earth – creating potentially dangerous electrical currents that, if severe enough, could damage the US power grid.

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