https://www.cnbc.com/2018/07/24/cyberattack-warnings-from-us-intelligence-officials-are-not-new.html

Department of Homeland Security officials confirmed a story, first reported by The Wall Street Journal, that nation-state hackers were suspected of breaking into the computer systems that run “hundreds” of U.S. utilities.

DHS spokesperson Lesley Fulop said the statements cited by the Journal were taken from an agency webinar hosted July 23. "As we say in the webinar, this activity took place last summer," she said in an email.