My husband works in energy and received is MBA with Chicago Booth (also where I went). Of course, he is also a Texan so I agree with the posters who talked about regional focuses (at least for internships and post-MBA jobs). However, after Booth he worked on Wall Street (energy sector) before moving to Texas (where he ran an energy focused hedge fund before taking a CFO position at an energy company).
He works closely with many people in traditional (and green) energy and these professionals hold MBAs for a variety of schools (HBS, Stanford, Columbia and UT all come to mind).
Any top business school will have an energy club. Remember, the idea of business school is to provide you with tools and skills that can be applied across industries. You might be interested in more flexible programs (like Chicago Booth) that would enable you to take more electives in different "schools", but, you will also have clubs and internships if there isn't a perfect energy program at a school that otherwise fits your needs. Most of the people my husband works with today studied operations or finance (or marketing) and then applied these skills in the energy field.