Page 151 of the owners manual says:
The available drive power may be reduced due to the following factors:
If needed, icons in the power gauge indicate a reduction of the drive power.
- ▷ Heavily discharged high-voltage battery.
- ▷ Extreme outside temperatures.
- ▷ Prolonged or high-power driving, for instance with a sporty driving style or when driving on mountain roads.
- ▷ Depending on vehicle equipment and na‐ tional-market version: engine power restric‐ tion defined via BMW Digital Key.
The gray ePOWER area is automatically adjusted.