US Navy has the best training available to prepare for a position in the power industry in the civilian world. Otherwise there are technical schools that offer associate degrees in power plant operations. One of the best I know of is Bismark State College in North Dakota. I think they even have a distance learning degree program for this. Or you can shoot for entry level positions in power plant such as a laborer or maybe a helper of some sort. After once you have your foot in the door it's all about hard work and learning from the right person.
I went to the Navy for six years, then to power plants as the lowest level operator in 1992 and have been an Operations Supervisor since 2005. To get here I just worked hard, found things that needed improvements and implemented them. Continued to train mainly by reading and also by finding the right person to train me in a paticular specialty.