America's power grids remain vulnerable to cyberattacks due in part to underinvestment in security by utility companies, a top military official told a group of technology leaders in Virginia. Gen. Keith Alexander, commander of U.S. Cyber Command, blamed the problem on a lack of resources stemming from the regulatory environment in which utilities operate, but other experts, including Rand Corp.'s Martin Libicki, say some power companies have yet to evolve from their traditional focus on guarding physical plant infrastructure.

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