I applied online. The process took 2 months. I interviewed at Xcel Energy in Nov 2015
Interview
After applying online I was contacted for an in person interview. I had an interview with the hiring manager and another senior engineering.
Unfortunately this was over a year ago. I do not remember interview questions specifically but I remember it being very standard questions for interns (e.g. explain a project you had. How did you struggle? etc.)
Interview questions [1]
Question 1
Tell us about your programming experience?
...
What specifically do you know?