Initial phone call, then in person interview with panel of two. Asked about seven questions. Friendly interviewers, tough questions. Called back within 2 weeks of the interview with results of the interview.
It was a panel with behavioral questions relevant to the position. I would suggest you have some specific examples ready. The interviews are hour long, with time for questions about the role.
I first had a phone screen, one more phone interview with multiple Xcel employees, then flown to Denver for two more in-person interviews before receiving an offer. It was enjoyable.