Iranian Foreign Ministry spokesman Ramin Mehmanparast said the Islamic republic will set a date for the official launch of Bushehr nuclear power plant, the semi- official ISNA news agency reported Monday.

Iran plans to hold a ceremony to announce the official activities of Bushehr power plant, Mehmanparast said, but the exact date of the ceremony has not been determined yet, according to ISNA.

The Russian contractor of the plant, Atomstroyexport, said Thursday in a statement that the plant will start to reach its full capacity from May 23 as scheduled.

According to Atomstroyexport, Bushehr, the first nuclear power plant in Iran, has successfully reached 90 percent of its nominal capacity in routine trials in early May.

Mehmanparast expressed hope that officials from various countries, particularly from Russia, would attend the ceremony.

In April, head of the Atomic Energy Organization of Iran (AEOI) Fereidoon Abbasi said the country's national grid received 940 megawatts of electricity from Bushehr nuclear power plant.

Iran held a ceremony in September 2011 to mark the preliminary launch of the delayed Bushehr project.

The construction of the 1,000-megawatt nuclear power plant halted when the United States imposed a hi-tech embargo on Iran after the 1979 Islamic revolution.

Russia signed a contract with Iran in 1998 to complete the construction. However, the project was postponed several times due to technical and financial challenges as well as pressure from the United States.