Yesterday, Washington Post ran a story that the Russians hacked our power grid. What happened was a laptop, not connected to the grid, owned by the power company had malware on it. It wasn't even a valid news event, but they reported the Russians did it. Fake News.
The way you hack a system that is off the internet (air gapped - as most of the hardware that is directly connected to major infrastructure such as refineries and power generation) is that you leave USB sticks with malware on them where a victim will find them.
The victim then goes 'hmm I wonder what is on this USB stick' - plugs it into the computer, and the malware you put on the USB stick is transferred to the laptop.
Then once the laptop is used by a technician on the air gapped hardware, the infrastructure gets infected.
They 'hacked the power company', which is what the story claimed, they simply were unable to bridge the air gap because someone caught the infection in time.
Since the malware bore the signature of Russian hackers, it wasn't a 'fake' news story, you were simply not well enough informed to understand what was going on.