dark warehouse
This is a warehouse which is fully automated so no one needs to be there. Once it is all set up you turn out the lights as you exit because the various machines and robots that are now running the show do not need light.
A dark warehouse needs a good deal of technology to be able to function. It has robotic arms picking the required items, connected conveyors taking items to the correct retrieval point, computers controlling where every item is, management systems tracking each item in storage or on its way to delivery, optical character recognition, and 3D printing for items that can be created on demand rather than stored on a shelf. So it is not cheap to set up but think what you save on electricity bills!