Iran and North Korea can make all of the electricity they want.
What the world is concerned about is that Iran and North Korea are run by fanatical maniacs. Kim Il Jong is 5' tall and wears lifts in his shoes, fancies himself a movie star, and runs North Korea like a prison camp. He has starved his people while he rules them like a king. He is also mentally unstable.
Iran is run by religious fanatics who believe that Americans and Westerners in general and anyone who is not a Shiite Muslim is a heretic and should be killed.
Both countries have been processing and enriching Plutonium to make enough nuclear fuel to build atomic bombs.
The U.S. (and China with North Korea being next door to it) and the rest of the world are worried about unstable, fanatic governments having control over nuclear weapons that can glaze the planet over for 10 milleniums, destroy all life forms as we know them today, and likely plunge the planet into total extinction.
And finally to answer your question, the US is trying to destroy most of its nuclear and biological stockpile to reduce the number of planet killing weapons at home, as well as abroad.
However, all of the above being good and well, most Iranian people just like most North Koreans just want to come home, have some food on the table, know that they have a roof over their heads, and maybe if its possible watch TV at night and engage in other family or individual activities, none of which involve the destruction of the planet..
Does this help?