The generator was a large hydroelectric generator located in the Pipeworks. The generator is a gigantic turbine, many stories high , and capable of powering the entire city of Ember. It is a major plot element in the first book. Around the year 241, the massive generator begins to reach the end of its operational life and begins to fail at powering the city. It was described to be the size of a house, and the top section contains a control room that can change electricity output and the speed of the turbines.