Iran's first nuclear power plant, the Bushehr plant, will connect to the national power grid by January 2011.
The west has imposed sanctions on Iran, fearing that nuclear power plant programmes may be used for purposes other than its civilian objectives.
Speaking to local reporters Atomic Energy Organisation of Iran deputy head Behzad Soltani said that the west could never undermine the country's nuclear progress and that Iran's future nuclear advancements will prove the ineffectiveness of enemies' pressures.
Before the fuel loading, principal tests of the power plant, including 250-bar pressure, 110-bar pressure on the second orbit, test on spherical metal with five load pressure and warm test were conducted.
The nuclear plant will begin operation after 163 fuel rods are injected into the plant's core in this phase.