Study of a demonstrator for intelligent management of Métro station infrastructure

How to use smart management for energy recovery in urban rail stations?


Reducing the station’s energy consumption by providing new energy sources and through optimised management of energy-intensive equipment, facilitated by the installation of a microgrid, or smart microgrid. Over and above the shaving of peak consumption achieved through the combination of storage and residual braking energy recovery, this offers the possibility of making use of this very intermittent energy source as renewable energy, to supply infrastructure other than traction and even to envisage resale. Recovering braking energy also reduces emissions of fine particles caused by mechanical braking and hence helps to improve indoor air quality.


Efficacity’s mission was to conduct a joint study with RATP of a variety of technical solutions, and evaluate their economic impact (reduction in energy bills), with quality of service taking priority.

These solutions involved in particular the energy optimisation of lighting and escalators and the introduction of a residual train braking energy recovery system to power low-voltage electric networks (station, staff premises, etc.).


The methodology deployed consisted of the following stages:

  • Diagnostic of consumption;
  • System modelling;
  • Development of energy and economy optimisation scenarios.


  • Energy gains:
    Smart management of station electrical equipment led to a reduction in consumption of the order of 10 to 20% with no modification to the equipment in question or to the associated maintenance. The recovery and storage of residual braking energy from a Métro line can lead to savings representing up to 50% of a station’s energy bill for each storage system installed; it is estimated that 2 to 3 recovery and storage systems may be installed per line.
  • Gain on indoor air quality:
    Reduction in fine particle emissions.

Client RATP

Dates 2016 – 2017

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La RATP est un consommateur d'énergie important, et la part des consommations des stations est croissante. Aussi les innovations scientifiques apportent des briques nouvelles aux compétences actuelles