Energy demand
Total primary energy supply of 13,699 mega-toe by source in 2014 (IEA, 2016)
World energy consumption is the total energy used by the entire human civilization. Typically measured per year, it involves all energy harnessed from every energy source applied towards humanity's endeavours across every single industrial and technological sector, across every country. It does not include energy from food, and the extent to which direct biomass burning has been accounted for is poorly documented. Being the power source metric of civilization, World Energy Consumption has deep implications for humanity's socio-economic-political sphere.
Institutions such as the International Energy Agency (IEA), the U.S. Energy Information Administration (EIA), and the European Environment Agency record and publish energy data periodically. Improved data and understanding of World Energy Consumption may reveal systemic trends and patterns, which could help frame current energy issues and encourage movement towards collectively useful solutions.
Closely related to energy consumption is the concept of total primary energy supply (TPES), which - on a global level - is the sum of energy production minus storage changes. Since changes of energy storage over the year are minor, TPES values can be used as an estimator for energy consumption. However, TPES ignores conversion efficiency, overstating forms of energy with poor conversion efficiency (e.g. coal, gas and [nuclear energy|nuclear]]) and understating forms already accounted for in converted forms (e.g. [[Photovoltaic system|photovoltaic] or hydroelectricity). The IEA estimates that, in 2013, total primary energy supply (TPES) was 1.575 × 1017Wh (= 157.5 PWh, 5.67 × 1020joules, or 13,541 Mtoe). From 2000–2012 coal was the source of energy with the largest growth. The use of oil and natural gas also had considerable growth, followed by hydropower and renewable energy. Renewable energy grew at a rate faster than any other time in history during this period. The demand for nuclear energy decreased, in part due to nuclear disasters (e.g. Three Mile Island 1979, Chernobyl 1986, and Fukushima 2011).
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