An energy management system is provided for a hybrid electric or electric vehicle including an electrical power collector for intermittently collecting electrical power from an external power supply track during driving of the vehicle. The energy management system is arranged to distribute electrical power from the electrical power collector to at least one electrical auxiliary load of the vehicle when collecting electrical power from the external power supply track. The enemy management system includes a control unit configured to control operating characteristics of the at least one auxiliary load depending on if the vehicle operates in a power collecting mode or in a non-power collecting mode.