Edward Teller and some other scientists solved the fusion – or thermonuclear or hydrogen – bomb’s problem in 1952. It was probably applied a normal atomic – fission – bomb first to heat up the hydrogen fuel properly.
However, Edward Teller said many times in the media that the fusion energy would not be apply simply to the an energy plant, because of its large explosion. But I think it can be used in small packages of fuels to avoid this problem.
As far as I knew, the fission energy could have been applicable as an usage of underwater nuclear bomb’s underneath detonation. This also means that recent regularly deployed set of warheads can be used as application of normal, peaceful atomic energy for heating water to turbines and producing electricity by their generators (connected to turbines). However, this manner of producing is toxic and for this it has to be avoided. But in the case of the fusion energy and H-Bomb, this problem is not so significant. So these bombs and their small packages probably can be used this way for peaceful, not so toxic energy production, and their source, the hydrogen atoms can be available in large amounts from the water.
I think I am not alone with this view and hope this energy will be achievable in soon as possible for the all of Humankind!