E-day calculated that if every one of the 22 million households in the UK turned off just one 100 watt light bulb, on the same day, four 500 megawatt coal-fired power stations could be turned off. E-Day's aim was to see whether this information could be brought to life in a way that involved and interested everyone, and whether asking everyone to switch off at least one electrical item for a day could produce a noticeable impact on the country's energy use and carbon emissions.
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