There are many industries that are interdisciplinary. There isn’t very likely a preference for one over the other (ChemE vs EE) in the solar energy industry, and those are likely not the only two majors you are limited to if that is the type of industry you want to go into. When you work in industry, you will likely work with colleagues with different majors on the same project.
If you are interested in both, you can choose whichever major you feel more interested in, and then take courses in the other as electives.