The government spokesman also rejected any idea of halting work the United States suspects is aimed at building nuclear bombs in return for trade, technology and other benefits.
Speaking a few days before the Islamic Republic's annual National Nuclear Technology Day on April 8, Gholamhossein Elham said he hoped for "good news" on that day but did not elaborate.
The world's fourth-largest oil producer says it needs to produce nuclear fuel for a planned network of power plants to satisfy soaring electricity demand.
"The trend of advancing nuclear capacity until reaching the production of nuclear fuel and building nuclear power plants to produce 20,000 megawatts of electricity will continue," Elham said.
On Thursday, diplomats told Reuters Iran has begun installing advanced uranium enrichment centrifuges in its Natanz enrichment complex, accelerating activity that could give it the means to make atom bombs in future if it chose to.
Iran has been hit with three sets of United Nations sanctions for hiding the program until 2003, failing to prove to inspectors since then that it is wholly peaceful and refusing to suspend the disputed program.Enriched uranium can be used as fuel in nuclear power plants or, if refined much further, provide material for weapons.