From the pjm.com website -

PJM internships available:

PJM Interconnection offers opportunities for undergraduate and graduate students to gain practical, real-world experience in a challenging and exciting work environment.

We offer students opportunities, in a variety of fields, for both summer positions and longer-term cooperative education assignments.

Visit the website to learn more: http://www.pjm.com/about-pjm/careers/university-programs.aspx