There are 3 notable non-signatories to the Nuclear Non-Proliferation Pact. India, Pakistan, and Israel. They dodged the issue by never signing on at all. They all have nukes now. Israel has a really large number of nukes, but has never officially admitted to it, yet everyone knows they have those weapons.

North Korea acceded to the NNPP, but later violated the terms by building and testing at least 2 nukes. THEY are in violation of the Pact, Iran isn't.

This puts Israel, as usual, in a totally unique situation in the world. The world rules that apply to everyone else apparently do not apply to Israel. They have not been penalized or criticized for building many nukes outside of the NNPP. They have not been sanctioned for doing it. No one else is in such a position. They are given carte blanche to do what no one else can do...without being ostracized for it.

Strange, isn't it?

In any case, Iran has NOT been denied the right to generate hydroelectric power with nuclear power plants. They have that legal right, they started on it when the Shah was still in power, and they have said all along that that is all they are doing. Iran does not object to being denied the right to build nuclear weapons, because they have never asked for such a right. They have asked to be left alone to use their nuclear power to generate electricity. They are NOT in violation of the NNPP.