Introducing Blue Price Promise, EDF Energy's new great-price, fixed tariff from low-carbon generation. The advert explains how, by switching to Blue, we promise to tell you if a competitor or EDF Energy launch a product that's more than £1 a week cheaper at typical use of 3300 kWh electricity and 16500 kWh gas, and 5000 kWh electricity for Economy 7 meters. Low-carbon electricity purchased for Blue is supplied into the National Grid. Blue customers receive electricity via the National Grid, not directly from low-carbon generators. For terms and conditions see edfenergy.com. Character under license from BeatBots LLC.