No, it is still very experimental. Commercial use is many years away
Nuclear fusion energy has not been fully utilized for commercial energy production. It is a promising source of energy that is still in the research and development phase due to the technical challenges of sustaining controlled fusion reactions.
Nuclear fusion is mainly used in the US for research purposes, with several projects working towards developing fusion as a viable energy source. Projects like ITER aim to demonstrate the feasibility of fusion power. However, commercial fusion power plants are not yet operational in the US.
It is not used on earth
Right now, except for the Sun, fusion is not a viable source of energy. We do not expect commercial production from fusion energy for another 50 to 100 years, if then. The technological obstacles are presently insurmountable, primarily due to problems with containment, but we are working on them.
Nuclear fusion is used as a potential source of clean and abundant energy in research and experimental reactors, such as ITER. It has the potential to produce electricity with fewer greenhouse gas emissions than fossil fuels, and it generates energy by fusing atomic nuclei together at extremely high temperatures. However, commercial fusion power plants are not yet operational.
There are fission and fusion reactors. However, at present (2016) there is no commercial fusion reactor which can produce more energy than is required to operate it.
Nuclear fission is the process of splitting a nucleus with a large mass into two nuclei with smaller masses. The energy released can then be used to produce electricity. Nuclear fusion is the process of merging nuclei with smaller masses into a nucleus with a larger mass. The energy released by this reaction may someday be used to produce electricity. In other words, Nuclear Fusion is the exact opposite of Nuclear fission. While Nuclear Fission is splitting a nucleus into two nuclei, nuclear fusion is merging two nuclei into a nucleus.
That is called nuclear energy.
The energy used for sublimation and fusion is thermal energy. Sublimation requires the input of heat energy to convert a solid directly into a gas, while fusion involves the heat energy required to overcome the electrostatic repulsion between atomic nuclei to combine them into a new nucleus.
The nuclear fusion is not used now as a source of energy; probable possible in a far future.
Nuclear fusion has been primarily used in research facilities and laboratories to study its potential for generating energy. It has not yet been harnessed for practical energy production on a commercial scale, although there are ongoing efforts to develop fusion reactors for this purpose.
SOS look it up