A disgruntled employee has pleaded guilty to felony attempted damage of an energy facility. Lonnie Charles Denison of South Natomasz has admitted to entering a room at the Independent System Operator's data center in Folsom, Sacramento, breaking a glass cover and pushing the button for emergency power off.
Denison's actions prevented the company from communicating to the electricity market for about two hours, leaving the electrical power grid vulnerable to shortages.
He is scheduled to be sentenced February 29.