There is no need to rinse the plates before placing them into the dishwasher. It is advisable to clear any leftover food particles from the plates before placing them into the dishwasher.
The consumption value: Program with maximum energy consumption: Auto wash program - 1.7kWh Electricity bill calculation: Energy Consumption (kWh) = 1.7 kWh
For more information on things to consider before buying a dishwasher, check out Electrolux Dishwasher Buying Guide.