ISIS is attacking the U.S. energy grid (and failing)

The Islamic State is trying to hack American electrical power companies -- but they are terrible at it.

U.S. law enforcement officials revealed the hack attempts on Wednesday at a conference of American energy firms who were meeting about national security concerns.

"ISIL is beginning to perpetrate cyberattacks," Caitlin Durkovich, assistant secretary for infrastructure protection at the Department of Homeland Security, told company executives.

Investigators would not reveal any details to CNNMoney -- or cite evidence of specific incidents.

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