Example:  Energy Usage Comparison
 
This graph compares the energy used by 5 elevators for one day. They are all traction elevators. Elevators 3 - 5 have motor-generator sets, which use proportionally more energy when idle than they do when moving.

Elevator 5 had a non-functioning switch to shut down the generator during idle times. Assuming $0.10 per KWH, fixing the switch would save the building owner nearly $20 per day.

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