HKNIC - World Energy Usage
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World Energy Usage
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Fossil fuels dominate in supplying our energy needs. Oil and gas have lower shares in electricity generation than in energy consumption because they are also used for heating and transportation. By contrast, nuclear energy and hydropower are almost exclusively used for electricity generation.

Electricity generation around the world is heavily dependent on non-renewable energy, which contributes 80% of total generation, of which 64% comes from fossil fuels and 16% from nuclear sources. The remaining 20% comes from renewable energy, comprising of 19% from hydropower and some 1% from other renewable energy sources.
World electricity generation (2010)
World Energy Usage

Source: US EIA 2013

[Ref: www.world-nuclear.org, Nuclear Power in the world today, 1/2005]

Gathering statistics on world energy usage is no easy task. It is difficult, for example, to collect statistics on the consumption of energy among households in developing countries. So in many cases only statistics on commercially traded energy are collected, and because of the complexity of the task, different studies may come up with slightly different sets of figures. Forecasting is no less problematic.

Forecasts for energy consumption depend on predicting future economic growth, the relative competitiveness of different energy types and the effect of government policies. A different set of assumptions in a forecast will give different patterns of future energy consumption.