The former Secretary of Defense William Cohen revealed that the US power grid is vulnerable to terror attacks, a major cyber attack was a matter time. A major attack on the power grid would cause chaos in the country by interrupting vital services for the population, the former government official said. Not only cyber attacks are threatening the vulnerable power grid, natural disasters, such as the solar storm known as the Carrington Event, could also interfere or disrupt the power delivery system nationwide. The UK Parliament revealed that UK Power Grid is under cyber attack from foreign hackers, but the emergency is for critical infrastructure worldwide.”]
Source: https://securityaffairs.co/wordpress/38296/security/us-power-grid-vulnerable.html