Hi Julia! Congrats on your interview with eon! I recently had it, as well :)
So as you probably know already, the recruiting day starts with one of the management team presenting the company. Then you have a short written analytical test on a quantitative case study.
Now the most important part of the interview follows: you will have 3 case study interviews that take about one hour each. It will be just you and the interviewer. The first half an hour is the “normal” kind of interview where they just ask you about your CV, your background, why you want to work for eon. They also check your current knowledge about the energy sector and about eon as a company in general. The second half an hour is a case study on the energy sector.
So for this part I recommend you to be very prepared. That means: read everything you can about the energy market, its challenges and recent developments! What I usually do is that I try to already imagine scenarios during the interview where I can “show off” my knowledge (of course it shouldn’t seem arrogant but you know what I mean ;) ). So maybe you practise a specific case and then you already try to put in your knowledge on a recent study you have read or whatever.
The most difficult part for me was to do all of that in the limited time... You should practise a lot of cases with other candidates and maybe preplounge experts. Half an hour for a case study is a very short time I think, so make sure you are able to get the solution within the time frame. That’s why it’s also important that you are fast at calculating, so for this I had to practise a lot beforehand as well.
After the case study interview, you will have a lunch with one of the consultants. You can or should use that time to ask them questions, also during the case study interview! I mean the interview is for them to get to know you, but also for you to get to know them and the company. So you should prepare a lot of questions to ask on career possibilities and everything you want to know! But try to google beforehand, so you don’t end up asking anything stupid ;)
As a general advice for any kind of interview of course you should be confident and open-minded, try to differentiate yourself from other candidates. For me it helps to be of course very prepared, but on the actual day I try to relax and not take it too seriously ;)
I hope this was helpful for you. I wish you the best of luck for your interview! Let me know how it went :)