It all happened at 5pm near Fjällskär, not far from Skavsta airport.
The rescue service is on site to put out the fire but is still prevented from going near the center of events due to the risks due to the run-down power line.
According to information from the rescue service, they were still waiting at 18.15 for the electricity to be turned off.
There is no information about injuries in connection with the incident.