E Cost Calulator directly calculated the costs for each device in your household. If you plan to switch your electricity supplier, you can also add a second electricity supplier to calculate the savings. To quickly identify a device that consumes much electricity you will see a percentage value depending on the total cost of all equipment and the total costs in the category. The costs themselves are displayed for one month and one year. Which helps you to get a quick overview of your current costs. For further analysis, the devices will be sorted by various criteria. You can sort the devices according to the cost to "Great power-hungry".
Sources: Quintec, Apple