WACOF/E/G of electricity generation of Centrica in the UK 2013-2018, by subsector

Since 2009, the Office of Gas & Electricity Markets (OFGEM) require the so-called 'Big Six' large energy suppliers to provide an annual consolidated statement (CSS) to show the costs, revenues and profits for the different segments of their generation and supply businesses.
* ‘WACOF/E/G’ is weighted average cost of fuel (nuclear), electricity (supply) and gas (thermal and supply) calculated by dividing direct fuel costs by volumes. For the Thermal sub-segment the cost of carbon emissions is added to direct fuel costs before dividing by the generated volume.
** WACOF/E/G for nuclear energy is shown in British pounds per megawatt hour and thermal energy in British pence per therm.