Line losses mainly correspond to energy lost through the Heating of the conductor when an electric current flows through it during transmission over high and very high voltage lines. Loss levels depend primarily on consumption, generation schedules and cross-border exchanges. RTE works to offset these losses.
There are different ways RTE can reduce losses during grid operations:
- Maintaining voltage at the highest values allowed by technical reference standards,
- Optimising the operational scheme of the network.
Losses on the transmission system represent between 2% and 3.5% of consumption, depending on the season and time of day. In 2019, the loss rate was 2.22%, which corresponded to about 11 TWh.
As the transmission system operator, RTE must ensure that electricity losses are offset. This involves purchasing electricity from suppliers.