In San Antonio, I used to work for the power company here. We have several coal plants, and schools could tour them. As part of the community outreach, you could call the power company and have a spokesperson talk about the different methods of generating power. A big hit with the kids is the pieces of coal the spokesperson would bring with them to show off.

So if it's a large, unspecified city, no doubt the local power company would have a similar program. Many have coal on display in a little museum at their main office also.