Really depends on what you want to do in the future I believe....Masters in Engineering in the Utility isn't going to get you a whole lot...Nor do I believe its worth going to a big name MBA school for 75k over a cheaper option from around 25-35k if you plan to stay in the utility. I vote for cheapish MBA that will most likely make you a shoe in for leadership type positions within your current company like director of a department and maybe eventually like a plant manager type position. That is if you plan on staying within the same company. If not you need to really decide what you want to do, a masters in engineering will most likely get you into research and development with a manufacture which with your background at a plant that would be a good deal. It could also land you a consult position within a independent firm, otherwise you are maybe looking at a promotion at your current job at best in my opinion. Anyway that my thoughts, my experience is a power delivery position within a utility and my father works in a generation plant for a different utility.