Iran held on Monday the official opening ceremony of its first nuclear power plant completed after long delay with Russia's assistance.

Russian Energy Minister Sergei Shmatko and head of the Russian Federal Atomic Energy Agency (Rosatom) Sergei Kiriyenko attended the ceremony.

"This demonstrates that Russia has met all its obligations [under the construction contract] despite the adverse political situation [surrounding the project]," Kiriyenko said.

The first unit at Bushehr has capacity to generate 1,000 megawatts. It was connected to the grid last week.