The episode came a day after the country said it had started up advanced uranium enrichment centrifuges at the site, in a breach of its commitments under a 2015 nuclear deal.
The facility has returned to normal working conditions after about two hours and Isfahan's power supply has been uninterrupted, says the managing director of Isfahan's electricity company.
Iranians have been suffering under sanctions and have been pummeled by the pandemic, but they aren't panicking.
The downing of the Ukrainian airliner, a harsh crackdown on protests and a drastic vetting system could mean Iranians stay home in large numbers on election day.
The traders' strikes in Iran that began on Monday appeared to have ended on Wednesday but the underlying issues of economic hardships that include currency devaluation and inflation have yet to be resolved.
The domestic flight came down in bad weather in a mountainous region in the south of the country.
State TV said six rioters were killed during an attack on a police station in the town of Qahdarijan while Iran's Supreme Leader accused enemies of the Islamic Republic of stirring unrest Iranian.
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