Invenergy Renewables Engineer interview questions

A couple weeks after applying, I received an email asking to set up a short phone interview with the recruiter. That took less than 30 minutes and was primarily about my interests and why I applied to Invenergy. A couple weeks later they brought me in for a in-person interview. It was formal and I interviewed with 4 sets of people in a row (some individuals and some pairs) who all worked on the renewables team. Then a couple weeks later I was asked to meet with one more manager from the team and we met at a coffee shop. After that I was told I would hear back from them in a couple weeks. However, at that deadline I asked how long it would take and they said another week. I waited and they still didn't get back to me. I waited for a total of 5 weeks and then told them I needed to hear because of another offer and they sent me a rejection email.