"An investigation into the disturbance has been initiated", writes Fingrid.
Finland's Prime Minister Petteri Orpo writes on X that the incident is being investigated.
"The loss of the connection does not affect Finland's electricity supply", writes Orpo.
Fingrid's spokesperson Arto Pahkin says to Yle that sabotage cannot be ruled out, but that problems of this type occur relatively often.
We have experienced similar incidents about ten times this year, says Pahkin.
The Estonian power company Elering states that it is unclear why the outage occurred, and that the electricity supply in Estonia is secure, reports Hufvudstadsbladet with reference to Estonian ERR.
Pahkin states in turn that Estonia is now working on getting electricity from other European countries, writes Yle.
In November, two underwater cables in the Baltic Sea were damaged, one between Finland and Germany and the other between Sweden and Lithuania.
In connection with this, there are suspicions against the Chinese vessel Yi Peng 3, which recently left the Kattegatt where it had been anchored since the end of November.
Swedish police and accident investigators have been on board the vessel and inspected it while it was anchored in the Kattegatt.
