The electricity exchange has a different price every hour. For example, a month with 31 days has 744 different prices. Your electricity invoice is calculated according to the electricity consumed in each hour and on the basis of the price valid in the respective hour. The invoiced kilowatt-hour cost is the average unit price based on your consumption. Exchange prices can be monitored on our website and on the Nord Pool website: https://www.nordpoolgroup.com/