Assembled piecemeal over the last 100 years or so, power-grid networks now span entire continents, with regional dis-tribution grids stitched together through interconnects. Improving the ability of operators to balance variations in s,upply and demand will require the construction of new high-capacity transmission lines to share power over larger areas. Because Europe has a more uniform population density than the United States, fewer long-distance lines are required.
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