Iran 's atomic chief said Wednesday the country's first nuclear power plant will be ready to generate electricity by January--two months later than previously announced.

Ali Akbar Salehi said the process of placing fuel rods at the Bushehr facility, built by Russia, would be completed by the "middle of" the Iranian month of Aban, around Nov. 7, the state television's website reported.

"Two or three months from then, the electricity generated by the plant will be connected to the grid," said Salehi, chief of
Iran 's Atomic Energy Organisation.

Iran began loading the Russian-supplied fuel rods Aug. 21 and Ali Shirzadian, spokesman for the atomic body, had then said the plant would be connected to the national grid by end of October or early November.

But Salehi later had said the loading would begin at the end of the Iranian month of Shahrivar (Sept. 22) and by the end of the month of Mehr (Oct. 22), the lid of the reactor would be shut.

Salehi, in an interview with Al-Alam television Aug. 31, blamed the delays on Bushehr's "severe hot weather" and safety concerns, adding that the loading was being done during the night.

Iran hasn't hinted at any other reasons for the delay, but officials have acknowledged that a computer worm is mutating and wreaking havoc on computerized industrial equipment in the country, where an official said Monday that about 30,000 IP addresses had already been infected.

Analysts say that the Stuxnet worm may have been designed to target
Iran 's nuclear facilities.

Iranian officials have denied the Islamic republic's first nuclear plant at Bushehr was among the addresses penetrated by the worm, but they have said that personal computers of personnel at the facility have been infected.

Iran says it needs the Bushehr plant, which had been under construction since the 1970s and was finally finished by Russia , to meet growing demand for electricity.

But the international community widely believes that
Iran 's atomic activities are masking a covert nuclear weapons programme, which Tehran denies.

Iran is under four sets of United Nations sanctions for its refusal to halt uranium enrichment--the process which can be used to make nuclear fuel but also the fissile core of an atom bomb in highly purified forms.