any interruption in the generation, transmission, or distribution of electric energy. Compare planned power outages (i.e. scheduled or arranged on short notice) vs. unplanned outages.
Depending on the scale and duration, the impacts of power outages can range from minor inconveniences like food spoilage to major economic effects and loss of life.
The combination of increased climate change impacts (e.g. wildfires, hurricanes) and the renewable energy transition will create new operating conditions that may result in an outage. It's wise to have a plan for backup power.