An explosion hit a power plant in the central Iranian province of Isfahan on Sunday, state news agency IRNA reported, saying it was over faulty equipment and caused no casualties.
A "worn out transformer... at Isfahan's Islamabad thermal power plant exploded at around 5:00 am today," the managing director of Isfahan's electricity company Said Mohseni told the agency.
The facility returned to normal working conditions after about two hours and Isfahan's power supply was uninterrupted, he added.
These incidents were the latest in a string of mysterious events, which began on June 30.
A gas explosion shook a residential building in Tehran, Iran, on Saturday, injuring one person, Iran's semi-official ISNA reported.
On Friday, IRIB reported that an explosion was heard in Western Tehran, and electricity had been cut in the area around where the explosion occurred.
Two people were killed in an explosion at a Tehran factory on July 7.
An explosion caused severe damage at the Natanz nuclear facility on July 2.
In June, an explosion near a military complex in Parchin area southeast of Tehran rocked the Iranian capital. Authorities blamed that blast on "leaking gas tanks."
13 people were killed in an explosion at a medical center in Tehran on June 30. Tehran Deputy Governor Hamid Reza Goudarzi told state TV that the explosion was caused by a gas leak.