Nuclear power is relatively mastered. Due to the wonderful world of politics, if you don't already have a nuclear reactor built there is very little chance of you ever being able to harness it. Hell, even Iran knows that nuclear power is the best bet. The only problem there is the byproducts of nuclear power are nuclear weapons and Israel really doesn't want that to happen considering they'd probably be the target.
I'll believe that when we have Nuclear fusion in another 40 years.