The specialization of energy and clean energy is demanding, and the future is heading towards it now, however, what is the field?
Are you planning to go to the university, major in energy, and after five years you want to be in demand in the labor market? Or do you mean that you are planning to open a company and want to know the situation after five years?
The answer to both will be that you need to have more experience in your field and you should read articles on a current research that may be ready within five years.
You should also think about “how to be the first in the field upon arrival in your country and how to be the best person in it.”