The reason for a power outage is often evident. Wind, storms, heavy snowfall or thunderstorms may cause a power cut. In clear weather, the reason may be a small animal hitting an overhead line or a tree falling on it.
Electricity faults may be in your own property, in the low-voltage network or in the medium-voltage network. The liability division between the customer and electricity company lies at the connection point of the low-voltage cable.
When part of the property has no power: e.g. one of the main fuses has blown or one of the low voltage phases is cut.
If the lights burn brighter or dim suspiciously when using another electrical device: the zero or PEN conductor of the low-voltage line may have been cut.
When all the power is off in a large area, there is a medium-voltage fault.
You will also find a lot of useful information on electricity faults on the Sähkönturvallisuuden edistämiskeskus STEK website (Finnish only, opens in new tab).
Put these items where they are easy to find in the dark.