These modules are meant to provide a space for power generation in the station.
The Module is usually a fairly large square room1) with multiple catwalks and gantries around the area where the generator would be. It comes standard with an Abwehran-made d-d_main_fusion_reactor. However, the module can come cheaper without it allowing for custom-installed generators of any type inside of the module. The module is in a constant state of Zero-G.
The Generator and its support systems are all located toward the center of the room.
There is one Damage Control Station on every wall, on every catwalk, and by the entrance. The damage control stations come with an alarm, first-aid kit, a fire hose spouting fire-suppressant foam and a small locker that can be packed with environmental suits.