In our calculations, we convert kWh to kg of carbon saved based on the current DECC guidelines. The conversion factor is 0.542 kg CO2 saved for each kWh produced from a carbon free source. The factor is based on the carbon emissions generated by the current UK power stations per kWh generated. This factor now includes other green house gasses such as methane and nitrous oxide which are converted to their carbon dioxide equivalents so the value is really kg CO2 eq. per kWh.
Source: http://www.rensmart.com/Information/Library/101006-guidelines-ghg-conversion-factors.pdf - See annex 3
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We are now able to give a live estimate of CO2 emissions due to electricity production in the UK and the corresponding kg of CO2 per kWh. The estimate is based on a live feed from the National Grid breakdown of current generation sources.
Current CO2 Emissions -- tonnes per hour
Current kg CO2 per kWh --