Electricity quality reflects two complementary measurements: the quality of voltage and continuity of supply.

Voltage quality can be affected by different types of disruption. It is important to draw a distinction between disruptions that are momentary, resulting from a one-time event (events affecting grid components, weather conditions, equipment damage, actions of third parties, etc.), and phenomena that continuously affect the nominal characteristics of the voltage wave, related to the operations of facilities connected to the grid or fluctuations in consumption and generation.

Continuity of supply is the grid’s ability to continuously supply power to all customer points of delivery. It may be affected by interruptions in supply or outages (for instance a lightning-related weather event). Continuity of supply is estimated based on equivalent outage time and outage frequency.

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Equivalent outage time


In 2019, equivalent outage time was 3 minutes 25 seconds, excluding exceptional events.

 

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Outage frequency


Outage frequency was 0.37 outage/site in 2019, excluding exceptional events.

⁎ Short outages last between 1 second and 3 minutes and long outages more than 3 minutes.

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