The interview process for OMLP included 5, 30min interviews in one morning or afternoon. They took you on a local plant tour for the other part of the day. The interviews were with the program manager, as well as local Supply Chain business leaders. They would be conducted at one of Power & Water's major sites, typically either Greenville, SC or Schenectady, NY (they would fly you there). If you are not an intern previously, you will have to an additional on-campus interview prior to the above process. I heard a decision the day after the 5 interviews.