An explosion occurred at a power plant in central Iran's Isfahan province on Sunday but there were no casualties, the country's official Irna news agency reported.
The 5am blast was caused by wear and tear of a transformer at the power station in the city of Islamabad, Said Mohseni, the managing director of the Isfahan power company, told Irna.
There have been several explosions and fires at Iranian military, nuclear and industrial facilities since late June.
The plant returned to normal after about two hours and Isfahan's power supply was uninterrupted, Mr Mohseni added.
Sunday's incident is the latest in a string of fires and explosions at military and civilian sites across Iran in recent weeks.
Two explosions rocked Tehran in late June, one near a military site and the other at a health centre, the latter killing 19 people.
Fires or blasts also hit a shipyard in southern Iran last week, a factory south of Tehran – leaving two dead – and the Natanz nuclear complex in central Iran earlier this month.
The Iranian authorities called the Natanz fire an accident but did not elaborate. They later said they would not reveal its cause, citing security reasons.
Iran's string of fires and explosions prompted speculation that Israel, the country's arch-enemy, may be behind a campaign of sabotage
Israel accuses Iran of seeking to acquire a nuclear bomb. Tehran insists its nuclear programme is entirely peaceful.
Europe’s rearming plan
- Suspend strict budget rules to allow member countries to step up defence spending
- Create new "instrument" providing €150 billion of loans to member countries for defence investment
- Use the existing EU budget to direct more funds towards defence-related investment
- Engage the bloc's European Investment Bank to drop limits on lending to defence firms
- Create a savings and investments union to help companies access capital
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About Karol Nawrocki
• Supports military aid for Ukraine, unlike other eurosceptic leaders, but he will oppose its membership in western alliances.
• A nationalist, his campaign slogan was Poland First. "Let's help others, but let's take care of our own citizens first," he said on social media in April.
• Cultivates tough-guy image, posting videos of himself at shooting ranges and in boxing rings.
• Met Donald Trump at the White House and received his backing.