Charging on Tesla Superchargers is included in your rental. However, penalties for untimely occupancy of the Supercharger are not included: Tesla charges for occupancy of the Supercharger when charging is complete. The amount is set by Tesla. It was around €0.8/min at the end of 2021. You will be re-billed for this penalty once the vehicle is returned. To help you avoid being charged, the vehicle will indicate the charging time required.
Recharging at public charging stations is at the driver's expense. The driver must have a charge card and be registered with a charge point provider. Europcar provides the Shell New Motion card at the counter: registration is free. Charges are billed by Shell New Motion on a fee-for-service basis.