Modern trolleybuses that were operating in the City of Gdynia were equipped with regenerative braking which means that during braking the vehicles generated energy and fed it back into the supply system. This energy could be absorbed (used) by other vehicles but before this energy was lost when there was no demand by other trolleybuses which could use this energy.
The installation of a stationary supercapacitor bank at a substation reduced energy demand by saving energy generated by regenerative braking. Supercaps accumulated and stored the energy gained from regenerative braking and kept it until it was used by other trolleybus. The supercap bank was additionally equipped with measurement instrument, measuring the input and output energy. Energy savings could then easily be measured.
The main objectives of this measure were to:
- reduce energy power demand of the trolleybus system by 20% compared to current monthly demand
- improve the energy efficiency of trolleybuses and the existing infrastructure by recuperation of energy from braking and storage
- set a national and European show case for innovative technology in public transport operation