Trading at utilities - Best place to start?

Hey everyone - rising junior here thinking about internship opportunities for next summer. Was focused on S&T for a while but am more interested in commodities trading as I learn more and more about the industry. Within commodities, power trading has really struck my interest. I've seen some posters on here mention that some utilities have solid trading arms - was curious if I could get some clarity on which utilities are more "trading focused" than others (i.e. spec books, allowed to take more risk, etc.)? Sorry if this is a noob question. Any advice/info is very much appreciated. Thank you everyone!