UK-based consulting firm Green Peninsula has the following Sankey diagram on their website showing electricity generation in the United Kingdom in 2012.


β€œIn 2012 around 920 TWh of primary energy … went into electricity generation in the UK. Due to conversion [in]efficiencies during electricity generation and losses during its transmission, 65% of this energy was lost – primarily as heat. With around 320 TWh reaching the end user, this equates to an overall supply efficiency of around 35%.”

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