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Late last week, the U.S. House of Representatives passed legislation to mandate federal research on a radically ‘retro’approach to protect power grids from cyber attack: unplugging or otherwise isolating the most criticalequipment from grid operators’ digital control systems. Angus King, an independent senator from Maine whose identical bill passedthe Senate last month, says such a managed retreat from networked controls may berequired to thwart the grid’s most sophisticated online adversaries.