Earlier on Saturday, SMHI issued a Class 1 warning for heavy thunderstorms in Dalarna, Värmland and Örebro counties.
During the evening, the rescue service Dala Mitt pulled out three times due to lightning - first they were alerted to a villa in Ludvika, at 17.30, where the lightning caused smoke to develop in the roof.
Shortly after 19 came the next alarm - then it burned in a machine hall.
- It was a witness who saw the impact, and it probably saved the building.
It was a quick effort, but it could have gone really bad, says Daniel Holmstrand.
At around 8 pm, the thunder caused a router to explode in an apartment building in Säter.
There was no major damage to the building.
No one was injured in any of the fires.