Types of Power Outages


A total loss of power to an area. A blackout is the most severe form of power outage that can occur. Blackouts resulting from (or result in) power stations tripping are particularly difficult to recover from quickly. Outages may last from a few minutes to a few weeks depending on the nature of the blackout.



A drop in voltage in an electrical power supply. The term “brownout” comes from the dimming experienced by lighting when the voltage sags. Brownouts can cause poor equipment performance or even incorrect operation.


Permanent Fault

A massive loss of power typically caused by a fault on a power line. Power is automatically restored once the fault is cleared.


  • Planned Outages

    Certain outages are planned to allow crews to safely maintain, repair or upgrade equipment.

  • Unplanned Outages

    There can be many causes of failures in an electricity network. Examples include short circuits, faults at power stations, overloading, human error, vandalism, and damage to transmission lines, substations or other parts of the grid.

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