Interactive: How the UK transformed its electricity supply in just a decade
Gemma Copeland
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In 2008, each kilowatt hour of electricity generated in the UK adds 495 grammes of CO2 to the atmosphere (gCO2/kWh). This important metric - the "carbon intensity" of the electricity system - is to fall by nearly 60% by 2018. For now, electricity demand has been rising for decades and is close to record highs.

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