Iran has the world's 6'th largest oil reserve (89 billion barrels), so why would they be in such a rush to develop nuclear power for energy?
It makes perfect economic sense. Don't burn oil that you could otherwise sell at a premium to oil consuming countries. The US, China, Russia are standing in line for oil.
Nuclear lasts forever. Oil may not.
Of course I don't believe that the Iranians are only going nuclear for the power, but the argument "they have so much oil why do they need nuclear?" is no longer valid.