I watch news video and notice they use "rolling" to describe a blackout at current snow disaster. I googled, it has many meanings. I am not sure which one fits. Common usage of rolling is rotating, but it doesn't fit. Does it mean repeated? Or endless in a metaphoric way?
A rolling blackout is one that starts in one area, and then over time it moves to a different (nearby) area, and then continues moving over time.
The most common reason for a blackout to be “rolling” is that it was intentional - they simply ran out of electricity and had to intentionally cut off the power. They distribute the shortage across different areas so that no one area suffers more than others.
However, blackouts caused by storms could also be described as rolling, partly because storms themselves travel from area to area, and partly because there are not enough repair crews available, which means that some areas get fixed while others have to wait.