Liz Hunter, Commercial Director at comparison site Money Expert, explained prices surge at times of high demand, and fall during off-peak hours. She said: "Electricity demand is highest between 7am and 9am when most people are waking up, and after school or work between 3:00pm and 6:00pm." The expert added best time to use white appliances, such as dishwashers, would be "before 7am, or late at night" to beat the hikes.