Portal:Energy
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Introduction
Energy (from Ancient Greek ἐνέργεια (enérgeia) 'activity') 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 for energy in the International System of Units (SI) is the joule (J).
Forms of energy include the kinetic energy of a moving object, the potential energy stored by an object (for instance due to its position in a field), the elastic energy stored in a solid object, chemical energy associated with chemical reactions, the radiant energy carried by electromagnetic radiation, the internal energy contained within a thermodynamic system, and rest energy associated with an object's rest mass. These are not mutually exclusive.
All living organisms constantly take in and release energy. The Earth's climate and ecosystems processes are driven primarily by radiant energy from the sun. The energy industry provides the energy required for human civilization to function, which it obtains from energy resources such as fossil fuels, nuclear fuel, and renewable energy.[relevant?] (Full article...)
Selected article
Acceptance of peak oil is far from universal, and the only reliable way to identify its existence will be in retrospect. One alternative scenario is that global production will eventually follow an 'undulating plateau' for one or more decades before declining slowly.
Having accurately predicted the date of peak production in the US petroleum industry, which occurred in 1970, M. King Hubbert, who devised the theory, forecast that the world peak would occur in 1995 'if current trends continue'. Various subsequent predictions have been made as trends have fluctuated in the intervening years. Two milestones have passed, however. The peak of world oilfield discoveries occurred in 1965 and, due world population growth, production per capita peaked in 1979.
The effects of peak oil could be mitigated through conservation and switching to alternative fuels or unconventional oil sources. Such changes would bring their own challenges, ranging from the need to development alternative technologies to potential increases in greenhouse gas emissions.
Selected image
Photo credit: NASA/TRACE
Plasma being channeled by the magnetic field loops of a sunspot.
Did you know?
- The Stuart Shale Oil Plant (pictured) in Australia was in operation only five years?
- Atlantic LNG Company of Trinidad and Tobago operates the world's largest LNG train?
- Despite projections of producing four times as much power as it used in heating, the Riggatron fusion reactor was never built due to a lack of funding?
- In the late 1980s, as many as 50 percent of Argentina's thermal power plants had to be shut down due to lack of maintenance, causing a supply crisis?
- Kashiwazaki-Kariwa Nuclear Power Plant in Japan, the largest nuclear power plant in the world, was shut down after being hit by the Chūetsu offshore earthquake in July 2007?
- The world's largest surface oil shale pyrolysis reactor is Petrosix, operated by the Brazilian oil company Petrobras?
- Russia plans to build several floating nuclear power stations?
- Shale gas, a form of natural gas extracted from shale, may also refer to oil shale gas?
Selected biography
In recognition of Watt's achievements, the SI unit of power, the watt, is named after him.
James Watt was born on 19th of January, 1736 in Greenock, a seaport on the Firth of Clyde. His father was a shipwright, shipowner and contractor, while his mother, Agnes Muirhead, came from a distinguished family and was well-educated. Both were Presbyterians and strong Covenanters. Watt attended school irregularly and instead was mostly schooled at home by his mother.
After studying instrument-making for a year in London, the University of Glasgow offered him the opportunity to set up a small workshop within the university. It was established in 1757. After four years, Watt began to experiment with steam, finally producing a working model steam engine in 1765. Strapped for resources to develop a full-scale engine, Watt was forced to take up employment as a surveyor for eight years. Finally, in 1776, the first engines were installed and working in commercial enterprises.
After further improvements, Watt and foundry owner Matthew Boulton established Boulton and Watt in 1794 to exclusively manufacture steam engines. By 1824 it had produced 1,164 steam engines having a total nominal horsepower of about 26,000.
In the news
- 27 July 2025 – Tariffs in the second Trump administration
- U.S. president Donald Trump and European Commission president Ursula von der Leyen announce a trade deal that would set a reciprocal 15% tariff on all exports and promise to boost European Union investment into the U.S. by $600 billion. The EU also promises to purchase $750 billion in American energy products over an unspecified period of time. (BBC News)
- 15 July 2025 – Indonesia–United States relations
- U.S. president Donald Trump announces a new trade deal with Indonesia, where Indonesia will purchase $15 billion in energy and $4.5 billion in agricultural products, along with 50 Boeing jets. Indonesia will also allow importation of U.S. products without tariffs, while the U.S. will maintain a 19% tariff on all goods coming from Indonesia. (Financial Times)
General images
The following are images from various energy-related articles on Wikipedia.
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Death rates per unit of electricity production for different energy sources (from Nuclear power) -
Schematic flow diagram of a typical crude oil distillation unit as used in petroleum crude oil refineries (from Oil refinery) -
Part of the Senftenberg Solarpark, a solar photovoltaic power plant located on former open-pit mining areas close to the city of Senftenberg, in Eastern Germany. The 78 MW Phase 1 of the plant was completed within three months. (from Solar power) -
Share of electricity production from nuclear, 2024 (from Nuclear power) -
Nuclear waste flasks generated by the United States during the Cold War are stored underground at the Waste Isolation Pilot Plant (WIPP) in New Mexico. The facility is seen as a potential demonstration for storing spent fuel from civilian reactors. (from Nuclear power) -
Australia (from Solar power) -
Utility cycling infrastructure, such as this bike lane in Vancouver, encourages sustainable transport. (from Sustainable energy) -
Honda Civic GX, a natural gas-powered automobile sold in North America from 1998 to 2015 (from Natural gas) -
The Hoover Dam in the United States is a large conventional dammed-hydro facility, with an installed capacity of 2,080 MW. (from Hydroelectricity) -
Natural gas drilling rig in Texas, US (from Natural gas) -
World map showing where people without access to electricity lived in 2016—mainly in sub-Saharan Africa and the Indian subcontinent (from Sustainable energy) -
Following the 2011 Fukushima Daiichi nuclear disaster, the world's worst nuclear accident since 1986, 50,000 households were displaced after radiation leaked into the air, soil and sea. Radiation checks led to bans of some shipments of vegetables and fish. (from Nuclear power) -
Schematics of a grid-connected residential PV power system (from Solar power) -
Net metering, unlike a feed-in tariff, requires only one meter, but it must be bi-directional. (from Solar power) -
Clean energy investment has benefited from post-pandemic economic recovery, a global energy crisis involving high fossil fuel prices, and growing policy support across various nations. By 2025, investment in the energy transition had grown to about twice that for fossil fuels (oil, natural gas and coal). (from Sustainable energy) -
Measurement of the tailrace and forebay rates at the Limestone Generating Station in Manitoba, Canada (from Hydroelectricity) -
Most waste packaging, small-scale experimental fuel recycling chemistry and radiopharmaceutical refinement is conducted within remote-handled hot cells. (from Nuclear power) -
The share of electricity production from solar, 2024 (from Solar power) -
Passive cooling features, such as these windcatcher towers in Iran, bring cool air into buildings without any use of energy. (from Sustainable energy) -
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Trends in the top five geothermal electricity-generating countries, 1980–2012 (US EIA) (from Geothermal power) -
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A comparison of prices over time for energy from nuclear fission and from other sources. Over the presented time, thousands of wind turbines and similar were built on assembly lines in mass production resulting in an economy of scale. While nuclear remains bespoke, many first of their kind facilities added in the timeframe indicated and none are in serial production.Our World in Data notes that this cost is the global average, while the 2 projects that drove nuclear pricing upwards were in the US. The organization recognises that the median cost of the most exported and produced nuclear energy facility in the 2010s the South Korean APR1400, remained "constant", including in export.
LCOE is a measure of the average net present cost of electricity generation for a generating plant over its lifetime. As a metric, it remains controversial as the lifespan of units are not independent but manufacturer projections, not a demonstrated longevity. (from Nuclear power) -
Anti-nuclear protest near nuclear waste disposal centre at Gorleben in northern Germany (from Nuclear power) -
North America (from Solar power) -
Sample of diesel fuel (from Oil refinery) -
A micro-hydro facility in Vietnam (from Hydroelectricity) -
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Typical composition of uranium dioxide fuel before and after approximately three years in the once-through nuclear fuel cycle of a LWR (from Nuclear power) -
Growth of worldwide nuclear power generation (from Nuclear power) -
Sample of kerosene (from Oil refinery) -
Yearly solar generation by continent (from Solar power) -
A pipeline odorant injection station (from Natural gas) -
Wind turbines in Xinjiang, China -
Fire-extinguishing operations after the Texas City refinery explosion (from Oil refinery) -
The status of nuclear power globally (click for legend) (from Nuclear power) -
Natural gas bus in Salamanca, Spain (from Natural gas) -
The multi-mission radioisotope thermoelectric generator (MMRTG), used in several space missions such as the Curiosity Mars rover (from Nuclear power) -
Benefitting from favorable policies and declining costs of modules, photovoltaic solar installation has grown consistently. In 2023, China added 60% of the world's new capacity. (from Solar power) -
Schematic flow diagram of a typical natural gas processing plant (from Natural gas) -
Motor oil (from Oil refinery) -
Acceptance of wind and solar facilities in one's community is stronger among U.S. Democrats (blue), while acceptance of nuclear power plants is stronger among U.S. Republicans (red). (from Solar power) -
Yearly geothermal generation by continent (from Geothermal power) -
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Natural gas processing plant in Aderklaa, Lower Austria (from Natural gas) -
Sample of crude oil (petroleum) (from Oil refinery) -
The oil refinery in Haifa, Israel, is capable of processing about 9 million tons (66 million barrels) of crude oil a year. Its two cooling towers are landmarks of the city's skyline. (from Oil refinery) -
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Manhole for domestic gas supply, London, UK (from Natural gas) -
The Calder Hall nuclear power station in the United Kingdom, the world's first commercial nuclear power station (from Nuclear power) -
Enhanced geothermal system 1:Reservoir 2:Pump house 3:Heat exchanger 4:Turbine hall 5:Production well 6:Injection well 7:Hot water to district heating 8:Porous sediments 9:Observation well 10:Crystalline bedrock (from Geothermal power) -
The nuclear fuel cycle begins when uranium is mined, enriched, and manufactured into nuclear fuel (1), which is delivered to a nuclear power plant. After use, the spent fuel is delivered to a reprocessing plant (2) or to a final repository (3). In nuclear reprocessing, 95% of spent fuel can potentially be recycled to be returned to use in a power plant (4). (from Nuclear power) -
Global geothermal electric capacity. Upper red line is installed capacity; lower green line is realized production. (from Geothermal power) -
Several countries and the European Union have committed to dates for all new cars to be zero-emissions vehicles. (from Sustainable energy) -
Merowe Dam in Sudan. Hydroelectric power stations that use dams submerge large areas of land due to the requirement of a reservoir. These changes to land color or albedo, alongside certain projects that concurrently submerge rainforests, can in these specific cases result in the global warming impact, or equivalent life-cycle greenhouse gases of hydroelectricity projects, to potentially exceed that of coal power stations. (from Hydroelectricity) -
Kenyan dairy farmer lighting a biogas lamp. Biogas produced from biomass is a renewable energy source that can be burned for cooking or light. (from Sustainable energy) -
Proportions of the isotopes uranium-238 (blue) and uranium-235 (red) found in natural uranium and in enriched uranium for different applications. Light water reactors use 3–5% enriched uranium, while CANDU reactors work with natural uranium. (from Nuclear power) -
The Leibstadt Nuclear Power Plant in Switzerland (from Nuclear power) -
Anacortes Refinery, on the north end of March Point southeast of Anacortes, Washington, United States (from Oil refinery) -
The launching ceremony of USS Nautilus January 1954. In 1958 it would become the first vessel to reach the North Pole. (from Nuclear power) -
The Warwick Castle water-powered generator house, used for the generation of electricity for the castle from 1894 until 1940 (from Hydroelectricity) -
The Three Gorges Dam in Central China is the world's largest power-producing facility of any kind. (from Hydroelectricity) -
Construction close to high pressure gas transmission pipelines is discouraged, often with standing warning signs. (from Natural gas) -
Part of the 354 MW Solar Energy Generating Systems (SEGS) parabolic trough solar complex in northern San Bernardino County, California (from Solar power) -
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Global energy usage is highly unequal. High income countries such as the United States and Canada use 100 times as much energy per capita as some of the least developed countries in Africa. (from Sustainable energy) -
Share of electricity production from hydropower, 2024 (from Hydroelectricity) -
Cooling towers at a geothermal power plant in Larderello, Italy -
Olkiluoto 3 under construction in 2009. It was the first EPR, a modernized PWR design, to start construction. (from Nuclear power) -
Buildings in the Solar Settlement at Schlierberg, Germany, produce more energy than they consume. They incorporate rooftop solar panels and are built for maximum energy efficiency. (from Sustainable energy) -
Storage tanks and towers at Shell Puget Sound Refinery (Shell Oil Company), Anacortes, Washington (from Oil refinery) -
Dry cask storage vessels storing spent nuclear fuel assemblies (from Nuclear power) -
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Actual annual deployments of solar PV vs predictions by the IEA for the period 2002–2016. Predictions have largely and consistently underestimated actual growth. (from Solar power) -
Deaths caused by use of fossil fuels such as natural gas (areas of rectangles in chart) greatly exceed those resulting from production of wind energy, nuclear energy or solar energy (rectangles barely visible in chart). (from Natural gas) -
Greenhouse gas emissions per energy source. Solar power is one of the sources with the least greenhouse gas emissions. (from Solar power) -
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A parabolic collector concentrates sunlight onto a tube in its focal point. (from Solar power) -
Reactor decay heat as a fraction of full power after the reactor shutdown, using two different correlations. To remove the decay heat, reactors need cooling after the shutdown of the fission reactions. A loss of the ability to remove decay heat caused the Fukushima accident. (from Nuclear power) -
Burning of natural gas coming out of the ground (from Natural gas) -
Museum Hydroelectric power plant "Under the Town" in Užice, Serbia, built in 1900 (from Hydroelectricity) -
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A gas bill from Baltimore, Maryland, 1834, for manufactured coal gas, before the introduction of ground-extracted methane gas. (from Natural gas) -
Crude oil is separated into fractions by fractional distillation. The fractions at the top of the fractionating column have lower boiling points than the fractions at the bottom. The heavy bottom fractions are often cracked into lighter, more useful products. All of the fractions are processed further in other refining units. (from Oil refinery) -
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By 2025, investment in the energy transition had grown to about twice that for fossil fuels (oil, natural gas and coal). (from Sustainable energy)
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For cooking, electric induction stoves are one of the most energy-efficient and safest options. (from Sustainable energy) -
Hydro generation by country, 2021 (from Hydroelectricity) -
Sample of gasoline (from Oil refinery) -
South and South-East Asia (from Solar power) -
Example of energy policy decisions: The goal of the Southern Gas Corridor, which connects the giant Shah Deniz gas field in Azerbaijan to Europe, is to reduce Europe's dependency on Russian gas. (from Energy policy) -
Electricity production by source (from Solar power) -
Cracks at the historic Town Hall of Staufen im Breisgau presumed due to damage from geothermal drilling (from Geothermal power) -
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Africa and Middle East (from Solar power) -
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Seasonal cycle of capacity factors for wind and photovoltaics in Europe shown under idealized assumptions. The figure illustrates the balancing effects of wind and solar energy at the seasonal scale (Kaspar et al., 2019). (from Solar power) -
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Electrified transport and renewable energy are key areas of investment for the renewable energy transition. (from Sustainable energy) -
Installed geothermal energy capacity, 2024 (from Geothermal power) -
Geothermal generation by country, 2021 (from Geothermal power) -
The outdoor section of a heat pump. In contrast to oil and gas boilers, they use electricity and are highly efficient. As such, electrification of heating can significantly reduce emissions. (from Sustainable energy) -
The Ffestiniog Power Station can generate 360 MW of electricity within 60 seconds of the demand arising. (from Hydroelectricity) -
Peoples Gas Manlove Field natural gas storage area in Newcomb Township, Champaign County, Illinois. In the foreground (left) is one of the numerous wells for the underground storage area, with an LNG plant, and above-ground storage tanks are in the background (right). (from Natural gas) -
Map of solar resources from World bank (from Solar power) -
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Natural gas burning on a gas stove (from Natural gas) -
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A photovoltaic power station in California, United States -
Life-cycle greenhouse gas emissions of electricity supply technologies, median values calculated by IPCC (from Nuclear power) -
The Ikata Nuclear Power Plant, a pressurized water reactor that cools by using a secondary coolant heat exchanger with a large body of water, an alternative cooling approach to large cooling towers (from Nuclear power) -
Refinery, Bayport Industrial Complex, Harris County, Texas (from Oil refinery) -
South America (from Solar power) -
A breakdown of the products made from a typical barrel of US oil (from Oil refinery) -
The growth of solar PV on a semi-log scale since 1996 (from Solar power) -
The town of Pripyat abandoned since 1986, with the Chernobyl plant and the Chernobyl New Safe Confinement arch in the distance (from Nuclear power) -
Oil refinery in Iran (from Oil refinery) -
Nuclear fuel assemblies being inspected before entering a pressurized water reactor in the United States (from Nuclear power) -
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Europe (from Solar power) -
The location of shale gas compared to other types of gas deposits (from Natural gas) -
The warming influence (called radiative forcing) of long-lived greenhouse gases has increased substantially in the last 40 years, with carbon dioxide and methane being the dominant drivers of global warming. (from Natural gas) -
Countries' proven natural gas reserves (2014), based on data from The World Factbook (from Natural gas) -
Activity of spent UOx fuel in comparison to the activity of natural uranium ore over time (from Nuclear power) -
Ivanpah Solar Electric Generating System with all three towers under load (from Solar power) -
Thomas Young - the first to use the term "energy" to refer to kinetic energy in its modern sense, in 1802. (from History of energy) -
Sulphur (from Oil refinery) -
Deaths caused as a result of fossil fuel use (areas of rectangles in chart) greatly exceed those resulting from production of sustainable energy (rectangles barely visible in chart). (from Sustainable energy)
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A woman in rural Rajasthan, India, collects firewood. The use of wood and other polluting fuels for cooking causes millions of deaths each year from indoor and outdoor air pollution. (from Sustainable energy) -
Since 1985, the proportion of electricity generated from low-carbon sources has increased only slightly. Advances in deploying renewables have been mostly offset by declining shares of nuclear power. (from Sustainable energy) -
Yearly hydro generation by continent (from Hydroelectricity) -
Russia was a key oil and gas supplier to Europe (map from 2013). This changed with the Russian invasion of Ukraine in 2022. (from Energy policy) -
The U.S. and Russia have been the predominant producers of natural gas. (from Natural gas) -
Natural gas extraction by countries in cubic meters per year around 2013 (from Natural gas) -
The first light bulbs ever lit by electricity generated by nuclear power at EBR-1 at Argonne National Laboratory-West, December 20, 1951. (from Nuclear power)
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Quotations
- "Without radical international measures to reduce carbon emissions within the next 10 to 15 years, there is compelling evidence to suggest we might lose the chance to control temperature rises. Failure to act will make an increase of between 2 and 5 degrees [3.6 - 9°F] in average temperatures almost inevitable." – Tony Blair, 2006
- "The question is not whether climate change is happening or not, but whether, in the face of this emergency, we ourselves can change fast enough." – Kofi Annan, 2006
- "I promise you a day will come when our children and grandchildren will look back and they will ask one of two questions. Either they will ask, 'What in God's name were they doing? Didn't they see the evidence?' Or, they may look back and say 'How did they find the uncommon moral courage to rise above politics and redeem the promise of American democracy?'" – Al Gore, 2007, on global warming.
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