ACTION 17 Take energy performance into account
in project design and implementation
Energy sobriety is one of the key challenges and objectives
of the Grand Paris Express. Current estimates indicate that
the infrastructure’s annual consumption will be in the range
of 600 GWh – equivalent to a city the size of Rennes.
Eco-design of the transport system
Société du Grand Paris selected a transport system based on
the most advanced technologies to limit energy consumption.
Making the traction power chain more efficient
The rolling stock specifications are designed to achieve
the most efficient traction power chain performance possible.
The stakes are high, since 20% to 25% of the energy injected
into the catenary is dissipated.
Electric braking
The metros’ service braking will be 100% electric. The trains
will produce energy by reinjecting the energy from braking
into the catenary. Energy savings compared with mechanical
braking are estimated at 30%. Electric braking also limits
particle production and air pollution.
Coasting
Coasting is movement after traction is turned off when
approaching a stop or in a reduced speed zone. It naturally
consumes less energy than running at full power, since less
kinetic energy is used (20% less than at full power).
Optimised train traffic
The metros will be automatic, which ensures optimal and
therefore lower-energy driving. Trains use energy when
they accelerate. but produce energy when braking.
Acceleration and braking
Aligning these two phases enables natural energy exchanges
between trains on the line and avoids energy diffusion and
loss. The synchronisation of these two phases is generally
established when the trains leave the terminal stations.
Some trains may be delayed along the way, upsetting the
energy optimisation balance. The innovation on the Grand
Paris Express is the fact that train traffic will be controlled in
real time all along the line, allowing adjustments in response
to unexpected events.
High energy-efficiency lighting
High-performance LED lighting will be used on the trains.
F O C U S 7
RISKS AND CHALLENGES
2020 ACTIVITY
IDENTITY
CSR APPROACH
Actions
