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National Definitions


Brownout: Reduced voltage in certain areas which may result in flickering of lights and/or damage to equipment/appliances. [1]

Other Definitions

Brownout ist ein Spannungseinbruch in einem Stromnetz, der dazu führen kann, dass elektrische Geräte beschädigt werden oder mit verminderter Leistung arbeiten (z. B. Lichter werden dunkler). [2]

A brownout is an intentional or unintentional drop in voltage in an electrical power supply system. [3]

Intentional brownouts are used for load reduction in a grid emergency, often in a round-robin basis for areas during the period of emergency (brown-out).

A reduction or cutback in electric power (especially as a result of a shortage, a mechanical failure, or overuse by consumers). [4]

A brownout is a partial, temporary reduction in system voltage or total system capacity. [5]

Note: Rolling blackouts are controlled and usually preplanned interruptions of service.


According to various sources an example of a brownout may also be the temporary disconnect of rural areas. The latter is considered to be a (rotational) blackout by others. No clear definitions by ENTSO-E and NERC on "brownout" have been found.

See also



  1. Power 101, Atty. Felix William B. Fuentebella Undersecretary (2018)
  2. ABB Glossary.
  3. Steven Warren Blume Electric power system basics: for the nonelectrical professional. John Wiley & Sons, 2007 ISBN 0470129875 p. 199
  4. Freedictionary
  5. Energy Dictionary - Energyvortex