Why is fusion nuclear energy currently not widely used as a source of electricity?

fusion reactions have not yet been achieved.

fusion reactions cannot be controlled.

fusion reactions require very high temperatures and pressure.

fusion reaction energy cannot be converted into electricity.

Fusion reactions require very high temperatures and pressure.

Explanation:

Fusion reactions are nuclear reactions where two small nuclei combine or fuse together to give a larger nuclei or different nuclei with some more sub atomic particles.

The source of energy in sun is fusion reaction between hydrogen to give helium nucleus.

For fusion of two nuclei , a particular energy barrier is to be overcome by the nuclei to come closer.

For this a large amount of initial energy (which is attained by high temperature and high pressure) is required. Hence this makes the candidature of nuclear fusion less favorable as compared to fission.