<P> World total primary energy supply (TPES), or "primary energy" differs from the world final energy consumption because much of the energy that is acquired by humans is lost as other forms of energy during the process of its refinement into usable forms of energy and its transport from its initial place of supply to consumers . For instance, when oil is extracted from the ground it must be refined into gasoline, so that it can be used in a car, and transported over long distances to gas stations where it can be used by consumers . World final energy consumption refers to the fraction of the world's primary energy that is used in its final form by humanity . </P> <P> In 2014, world primary energy supply amounted to 155,481 terawatt - hour (TWh) or 13,541 Mtoe, while the world final energy consumption was 109,613 TWh or about 29.5% less than the total supply . World final energy consumption includes products as lubricants, asphalt and petrochemicals which have chemical energy content but are not used as fuel . This non-energy use amounted to 9,404 TWh (809 Mtoe) in 2012 . </P> <P> By the end of 2014, the total installed global power generating capacity is nearly 6.142 TW (million MW) which does not include the DG sets not connected to local electricity grids . In 2014, world energy consumption for electricity generation was coal 40.8%, natural gas 21.6%, nuclear 10.6%, hydro 16.4%,' others' (solar, wind, geothermal, biomass, etc .) 6.3% and oil 4.3% . Coal and natural gas were the most popular energy fuels for generating electricity . The world's electricity consumption was 18,608 TWh in 2012 . This figure is about 18% smaller than the generated electricity, due to grid losses, storage losses, and self - consumption from power plants (gross generation). Cogeneration (CHP) power stations use some of the energy that is otherwise wasted for heating buildings or in industrial processes . </P> <P> 2014 World electricity generation (23,816 TWh) by source (IEA, 2016) </P>

What percentage of the world's electricity is supplied by coal