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The Energy Portal
Welcome to Wikipedia's Energy portal, your gateway to energy. This portal is aimed at giving you access to all energy related topics in all of its forms.
Page contents: Selected articleSelected imageSelected biographyDid you know?General imagesQuotationsRelated portalsWikiprojectsMajor topicsCategoriesHelpAssociated Wikimedia


The Sun is the ultimate source of energy for most of life on Earth. It derives its energy mainly from nuclear fusion in its core, converting mass to energy as protons are combined to form helium. This energy is transported to the sun's surface and released into space (mainly in the form of radiant (light) energy).

In physics, energy is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The unit of measurement in the International System of Units (SI) of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of one metre against a force of one newton.

Common forms of energy include the kinetic energy of a moving object, the potential energy stored by an object's position in a force field (gravitational, electric or magnetic), the elastic energy stored by stretching solid objects, the chemical energy released when a fuel burns, the radiant energy carried by light, and the thermal energy due to an object's temperature.

Mass and energy are closely related. Due to mass–energy equivalence, any object that has mass when stationary (called rest mass) also has an equivalent amount of energy whose form is called rest energy, and any additional energy (of any form) acquired by the object above that rest energy will increase the object's total mass just as it increases its total energy. For example, after heating an object, its increase in energy could in principle be measured as a small increase in mass, with a sensitive enough scale.

Living organisms require energy to stay alive, such as the energy humans get from food and oxygen. Human civilization requires energy to function, which it gets from energy resources such as fossil fuels, nuclear fuel, or renewable energy. The processes of Earth's climate and ecosystem are driven by the radiant energy Earth receives from the Sun and the geothermal energy contained within the earth. (Full article...)

Selected article

Whitelee Wind Farm is operated by ScottishPower Renewables and is the largest on-shore wind farm in the United Kingdom with a total capacity of 539 megawatts (MW).

The production of renewable energy in Scotland is a topic that has come to the fore in technical, economic, and political terms during the opening years of the 21st century. The natural resource base for renewable energy is high by European, and even global standards, with the most important potential sources being wind, wave, and tide. Renewables produced the equivalent of 97.4% of Scotland's electricity consumption in 2020, mostly from the country's wind power.

In 2015, Scotland generated 59% of its electricity consumption through renewable sources, exceeding the country's goal of 50% renewable electricity by that year. At the start of 2020, Scotland had 11.8 gigawatts (GW) of installed renewable electricity capacity, which produced approximately 25% of total UK renewable generation (119,000 GWh). In 2018, Scotland exported over 28 per cent of generation and in 2019 renewable electricity generation made up 90% of gross electricity consumption. In decreasing order of capacity, Scotland's renewable generation comes from onshore wind, hydropower, offshore wind, solar PV and biomass. (Full article...)

Selected image

Sunspot TRACE.jpeg

Photo credit: NASA/TRACE
Plasma being channeled by the magnetic field loops of a sunspot.

Did you know?

A compact fluorescent lamp
  • Positive lightning bolts are typically six to ten times more powerful than normal lightning — and aircraft are not designed to withstand them?
  • Dark energy is a hypothetical form of energy which permeates all of space?

Selected biography

Marion King Hubbert (1903–1989) was a geophysicist who made several important contributions to geology and geophysics, most notably the Hubbert curve and Hubbert peak theory (or peak oil), with important political ramifications.

Born in Texas, Hubbert studied geology, mathematics, and physics at the University of Chicago. He pursued his Ph.D. while working for the Amerada Petroleum Company, then worked for the Shell Oil Company from 1943 until 1964. On leaving Shell he became a senior research geophysicist for the United States Geological Survey until retiring in 1976. Hubbert was also a professor at Stanford University and at UC Berkeley.

Hubbert is most well-known for his studies on the capacities of oil fields and natural gas reserves. He predicted that, for any given geographical area, the rate of petroleum production over time would resemble a bell curve. At the 1956 meeting of the American Petroleum Institute, Hubbert predicted that United States petroleum production would peak in the late 1960s or early 1970s. He became famous when his prediction came true in 1970.

In 1974, Hubbert projected that global oil production would peak in 1995 "if current trends continue". Various subsequent predictions have been made by others as trends have fluctuated in the intervening years. Hubbert's theory, and its implications for the world economy, remain controversial.

In the news

13 May 2022 – Enlargement of NATO
RAO Nordic, a subsidiary of Russian energy company Inter RAO, announces it will suspend deliveries of electricity to Finland, saying it has not been paid for prior deliveries. The suspension comes as Russia threatens retaliation if Finland joins NATO. (BBC News)
1 May 2022 – International sanctions during the Russo-Ukrainian War
Hungary, a member of the European Union, says that it will veto any sanctions that would restrict energy imports from Russia. Unanimity among the 27 EU members is required to introduce sanctions. (Bloomberg)
27 April 2022 – Russia in the European energy sector
2022 Russia–European Union gas dispute
Gazprom announces that it has "completely suspended gas supplies" to the gas companies of Poland and Bulgaria "due to [the] absence of payments in roubles". Bulgaria, Poland, and the European Union condemn the suspension. (Reuters) (Reuters)
The suspension of gas to Poland and Bulgaria causes natural gas prices to increase and also causes the Russian ruble to reach a 2 year high against the Euro in Moscow trade. (Reuters) (Reuters) (Natural Gas Intelligence)

General images

The following are images from various energy-related articles on Wikipedia.


  • "My administration is committed to a leadership role on the issue of climate change. We recognize our responsibility and will meet it - at home, in our hemisphere, and in the world." – George W. Bush, 2001
  • "While the Kyoto Protocol is a crucial step forward, that step is far too small. And as we consider how to go further still, there remains a frightening lack of leadership." – Kofi Annan, 2006
  • "It is going to be very difficult to keep temperature increases down to between 2 and 3 degrees centigrade [3.6 - 5.4°F]. We should work very hard to do that." – Nicholas Stern, 2006
  • "Halting global warming requires urgent, unprecedented international cooperation, but the needed actions are feasible and have additional benefits for human health, agriculture and the environment." – James E. Hansen, 2004

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