Three part interview, each section was an hour and 15 minutes. First part was values based (describe-a-time-when questions). Second part was technical where they asked a long list of engineering theory / textbook questions. For the second part, they also send you a spreadsheet ahead of time with some general information about a building. They ask for you to calculate the estimated energy consumption of the building and to walk through your calculations during the interview. The last section is with their CEO.

Three part interview: Part one was values based, "describe a time when" types of questions. Part two was technical, which included some homework that needed to be done before the interview. They provide a spreadsheet with some descriptions of a building, you have to calculate the estimated energy consumption and show your work during the interview. They also ask a bunch of engineering theory / textbook questions. Last part of the interview is with their CEO.