If I want to study energy which field do I go into?

Curious about this topic

What do you mean by “energy”? Literally every kind of engineering deals with “energy”.

UC Berkeley has an Energy Engineering major. Stanford has an Atmosphere/Energy major focused more on renewable energy. There are quite of few universities offering Petroleum Engineering degrees. It is also possible to study Bioengineering or plant sciences to focus on bio-energy (from plants, algae, etc.). Within earth science departments, there are majors that study geothermal energy. The major will depend on what type of energy you want to focus on, and what you want your job to involve.

EEs work in energy like solar and power and control systems. Or do you mean work and energy like in thermo systems. Your questions is vague.

Just about any engineering (or physical science) program can lead to a career in the energy industry. Choose the engineering discipline that most interests you and see if your college has an Energy focused minor. One example is the [url="<a href=“http://bulletin.iit.edu/undergraduate/undergraduate-education/minors/#E3%22%5DE3%5B/url”>http://bulletin.iit.edu/undergraduate/undergraduate-education/minors/#E3"]E3[/url] minor that is available at my university, Illinois Tech.