I don't know what you mean by transmitter.

I know of one factory that has their own coal power plant. The boiler is from the 1880s, the generator installed in the 1920s. It is horribly inefficient by any reasonable standard and takes hours to turn on. However because they keep it operational the power company gives them a massive discount on electric. About ever 5 years there is a major event and the power company has them turn it on for a few days and they power the entire town.