Electricity is recycled at DB

Deutsche Bahn aims to be climate-neutral by 2040 and reduce its greenhouse gas emissions across the entire value chain to net zero. This goal is supported by an implementation plan and validated by the renowned and independent Science Based Targets initiative (SBTi). To achieve this, DB is focusing on maximizing the energy efficiency of trains and buses, for example. 

Braking and saving energy

Many of DB's own vehicles even generate electricity themselves – simply by braking. For example, all modern electric trains are equipped with a brake energy recovery function. 

When braking, the trains' motors work as generators. This converts the kinetic energy into electricity, which flows back into the overhead line and can then be used by other trains. In total, more than 1,500 gigawatt-hours of electricity were fed back into the grid (as of the end of 2025; based on DB’s electric multiple units in commuter and long-distance service, as well as electric locomotives).

The graphic explains the basic principle of traction energy recovery, which is based on magnetic induction. Here, rotary motion is converted into electrical energy with the help of magnetic fields. During conversion on the vehicle, the rotor continues to turn due to the kinetic energy of the train and the induction coils convert magnetic energy into electrical energy. Electricity is emitted in the process.

How traction energy recovery works in the train

Regenerative braking in the bus fleet 

DB buses also use generators that produce electrical energy during braking. This braking energy is stored and used, for example, to power the interior lighting, when the bus is stationary and the engine is turned off. This helps reduce the bus fleet’s fuel consumption. Many of these so-called mild-hybrid buses are already in service in the DB bus fleet.

One of the new hybrid articulated buses from MAN that is making the DB bus fleet more climate-friendly.

Efficient Charging

Whether in the event of a malfunction or when turning around at a station: The batteries in ICE trains always supply the on-board power system with sufficient energy when power is not available from the overhead lines. To extend the service life of the batteries, Deutsche Bahn has developed an energy-efficient charging method as part of the “Anderslader” project, which is in use on all ICE4 trains. 

To do this, the batteries are first connected to the power grid and slowly discharged — the discharged energy is fed back into the grid. The battery is then recharged via the power grid. This extends the service life of the batteries and reduces maintenance costs.

Charging - only the other way round: To ensure that the batteries in ICE trains last as long as possible, the storage units are completely discharged in the first step. The discharged energy is fed back into the power grid and can be reused elsewhere.