Why can charging power be more expensive than household power?

Charging requires much higher peak power than normal household use, which often results in a heavier connection, a separate circuit and additional maintenance. These extra costs are spread over relatively few kWh per charging session, which means the cost per kWh of charging is higher than that of domestic electricity. You determine the selling price yourself; you can set the charging point as a separate object with its own kWh price. If you don't have a charging point, or use it rarely, this distinction is not necessary.