Newly released documents confirm that the National Security Agency (NSA), America’s top cyberespionage organization, is spearheading a cloaked and controversial program to develop technology that could protect the US power grid from cyberattack.

Existence of the program, dubbed Perfect Citizen, was revealed in a 2010 Wall Street Journal article. But intriguing new details are revealed in documents released by the NSA last month to the Electronic Privacy Information Center (EPIC), an Internet privacy group that petitioned for them in 2010 under the Freedom of Information Act.

Of the 188 pages of documents released by the agency, roughly half were redacted to remove classified information. Even so, the documents show Perfect Citizen to be in the fourth year of a five-year program begun in 2009. Valued at up to $91 million, the Perfect Citizen technology is being developed by Raytheon, the Waltham, Mass., defense contractor that won it.

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