The main difference between peak, flat and off-peak hours is the different electricity prices in each of them. We tell you more: Rush hour: It takes place only from Monday to Friday between 10:00 am and 2:00 pm and from 6:00 pm to 10:00 pm. This is the period when the price of electricity is the most expensive. Flat Hour: Takes place from Monday to Friday from 8:00 am to 10:00 am, from 2:00 pm to 6:00 pm and from 10:00 pm to 00:00 am. Recommended time to save on your electricity bill. Valley hour: It includes the hours from 00:00 to 08:00 from Monday to Friday, weekend days (Saturdays and Sundays) and national holidays throughout the day, uninterrupted. We are talking about the time when the price of electricity is the lowest. In a very visual way you have this information at the top of the page in the section "Get to know the tariff periods".