Portal:Energy
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Introduction
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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; matter and energy may also be converted to one another. 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.
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. (Full article...)
Selected article
The defining feature of an internal combustion engine is that useful work is performed by the expanding hot gases acting directly to cause movement, for example by acting on pistons, rotors, or even by pressing on and moving the entire engine itself.
Internal combustion engines are most commonly used for mobile propulsion systems, where their high power-to-weight ratios, together with excellent fuel energy-density, are advantageous. They have appeared in almost all automobiles, motorbikes, many boats, and in a wide variety of aircraft and locomotives. Where very high power is required, such as jet aircraft, helicopters and large ships, they appear mostly in the form of gas turbines. They are also used for electric generators and by industry.
The most common fuels in use today are hydrocarbons derived from petroleum including diesel, gasoline and liquified petroleum gas. Most internal combustion engines designed for gasoline can run on natural gas or liquified petroleum gases without modifications except for the fuel delivery components. Liquid and gaseous biofuels, including ethanol and biodiesel can also be used, and trials of hydrogen fuel have been in progress for some years.
Selected image
Photo credit: Postdlf
Lightning is a highly visible form of energy transfer.
Did you know?
- Buildings constructed to the German Passivhaus standard use 75% to 95% less energy for space heating and cooling than current new buildings in the United States?
- Crossing 4,000 km (2,500 miles), the Druzhba pipeline is the world's longest oil pipeline?
- Coal is ground to a powder before being burnt in fossil fuel power plants?
- Compact fluorescent lamps (pictured) use about 1/4 of the energy of normal incandescent light bulbs, and pay for themselves after about 500 hours of use?
- Nuclear power in France produces 78% of all the country's electricity - more than in any other nation?
- 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
Maxwell studied natural philosophy, moral philosophy, and mental philosophy at the University of Edinburgh, before graduating in mathematics at the University of Cambridge, where he would conduct much of his career. He built on Michael Faraday's work on magnetic induction, using elements of geometry and algebra to demonstrate that electric and magnetic fields travel through space, in the form of waves, and at the constant speed of light. Finally, in 1861, Maxwell proposed that light consisted of undulations in the same medium that is the cause of electric and magnetic phenomena. In the same year he was elected to the Royal Society.
In 1864, Maxwell presented what are now known as Maxwell's equations to the Royal Society. These collectively describe the behaviour of both the electric and magnetic fields, as well as their interactions with matter.
In the news
- 22 November 2024 –
- Energy company Phillips 66 is indicted in a United States federal court on six charges of violating the Clean Water Act in Los Angeles County, California. (CBS News)
- 20 November 2024 –
- Indian billionaire and Adani Group chairman Gautam Adani is indicted in the U.S. for his role in an alleged multi-billion dollar bribery and fraud scheme where he and seven others paid Indian government officials US$265 million to obtain contracts for Adani Green Energy. (AsiaOne) (Bloomberg)
- 18 November 2024 – Russian invasion of Ukraine
- Ukrainian energy crisis, 17 November 2024 Russian strikes on Ukraine
- Ukraine re-implements nationwide rolling blackouts primarily due to yesterday's destruction of energy infrastructure by Russian airstrikes. (Reuters)
- 17 November 2024 – Russian invasion of Ukraine
- Russian strikes against Ukrainian infrastructure, Ukrainian energy crisis
General images
The following are images from various energy-related articles on Wikipedia.
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The location of shale gas compared to other types of gas deposits (from Natural gas) -
Yearly geothermal generation by continent (from Geothermal power) -
Motor oil (from Oil refinery) -
A micro-hydro facility in Vietnam (from Hydroelectricity) -
Sample of gasoline (from Oil refinery) -
Map of solar resources from World bank (from Solar power) -
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) -
Europe (from Solar power) -
Natural gas drilling rig in Texas, US (from Natural gas) -
Wind turbines in Xinjiang, China -
A gas bill from Baltimore, Maryland, 1834, for manufactured coal gas, before the introduction of ground-extracted methane gas. (from Natural gas) -
Storage tanks and towers at Shell Puget Sound Refinery (Shell Oil Company), Anacortes, Washington (from Oil refinery) -
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) -
Fire-extinguishing operations after the Texas City refinery explosion (from Oil refinery) -
World map showing where people without access to electricity lived in 2016—mainly in sub-Saharan Africa and the Indian subcontinent (from Sustainable energy) -
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. (from Sustainable energy) -
Geothermal generation by country, 2021 (from Geothermal power) -
The share of electricity production from solar, 2023 (from Solar power) -
Construction close to high pressure gas transmission pipelines is discouraged, often with standing warning signs. (from Natural gas) -
Share of electricity production from hydropower, 2023 (from Hydroelectricity) -
Natural gas processing plant in Aderklaa, Lower Austria (from Natural gas) -
A pipeline odorant injection station (from Natural gas) -
Most waste packaging, small-scale experimental fuel recycling chemistry and radiopharmaceutical refinement is conducted within remote-handled hot cells. (from Nuclear power) -
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) -
Sulphur (from Oil refinery) -
Death rates per unit of electricity production for different energy sources (from Nuclear power) -
Natural gas burning on a gas stove (from Natural gas) -
Electricity production by source (from Solar power) -
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) -
Bloomberg NEF reported that in 2022, global energy transition investment equaled fossil fuels investment for the first time. (from Sustainable energy) -
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Ivanpah Solar Electric Generating System with all three towers under load (from Solar power) -
Utility cycling infrastructure, such as this bike lane in Vancouver, encourages sustainable transport. (from Sustainable energy) -
Several countries and the European Union have committed to dates for all new cars to be zero-emissions vehicles. (from Sustainable energy) -
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Cracks at the historic Town Hall of Staufen im Breisgau presumed due to damage from geothermal drilling (from Geothermal power) -
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The launching ceremony of the USS Nautilus January 1954. In 1958 it would become the first vessel to reach the North Pole. (from Nuclear power) -
The Calder Hall nuclear power station in the United Kingdom, the world's first commercial nuclear power station. (from Nuclear power) -
United States and USSR/Russian nuclear weapons stockpiles, 1945–2006. The Megatons to Megawatts Program was the main driving force behind the sharp reduction in the quantity of nuclear weapons worldwide since the cold war ended. (from Nuclear power) -
Hydro generation by country, 2021 (from Hydroelectricity) -
Passive cooling features, such as these windcatcher towers in Iran, bring cool air into buildings without any use of energy. (from Sustainable energy) -
South and South-East Asia (from Solar power) -
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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) -
Global geothermal electric capacity. Upper red line is installed capacity; lower green line is realized production. (from Geothermal power) -
South America (from Solar power) -
The Ffestiniog Power Station can generate 360 MW of electricity within 60 seconds of the demand arising. (from Hydroelectricity) -
Trends in the top five geothermal electricity-generating countries, 1980–2012 (US EIA) (from Geothermal power) -
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) -
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) -
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) -
A breakdown of the products made from a typical barrel of US oil (from Oil refinery) -
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) -
Sample of crude oil (petroleum) (from Oil refinery) -
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) -
For cooking, electric induction stoves are one of the most energy-efficient and safest options. (from Sustainable energy) -
The Three Gorges Dam in Central China is the world's largest power-producing facility of any kind. (from Hydroelectricity) -
Cooling towers at a geothermal power plant in Larderello, Italy -
The Warwick Castle water-powered generator house, used for the generation of electricity for the castle from 1894 until 1940 (from Hydroelectricity) -
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Refinery, Bayport Industrial Complex, Harris County, Texas (from Oil refinery) -
Africa and Middle East (from Solar power) -
Sample of kerosene (from Oil refinery) -
The town of Pripyat abandoned since 1986, with the Chernobyl plant and the Chernobyl New Safe Confinement arch in the distance (from Nuclear power) -
Sample of diesel fuel (from Oil refinery) -
Anacortes Refinery, on the north end of March Point southeast of Anacortes, Washington, United States (from Oil refinery) -
Measurement of the tailrace and forebay rates at the Limestone Generating Station in Manitoba, Canada. (from Hydroelectricity) -
Dry cask storage vessels storing spent nuclear fuel assemblies (from Nuclear power) -
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) -
Anti-nuclear protest near nuclear waste disposal centre at Gorleben in northern Germany (from Nuclear power) -
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) -
Nuclear fuel assemblies being inspected before entering a pressurized water reactor in the United States (from Nuclear power) -
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Museum Hydroelectric power plant "Under the Town" in Užice, Serbia, built in 1900. (from Hydroelectricity) -
Schematics of a grid-connected residential PV power system (from Solar power) -
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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) -
Greenhouse gas emissions per energy source. Solar power is one of the sources with the least greenhouse gas emissions. (from Solar power) -
Countries by natural gas proven reserves (2014), based on data from The World Factbook (from Natural gas) -
Schematic flow diagram of a typical natural gas processing plant (from Natural gas) -
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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) -
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) -
The Hoover Dam in the United States is a large conventional dammed-hydro facility, with an installed capacity of 2,080 MW. (from Hydroelectricity) -
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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) -
Thomas Young - the first to use the term "energy" to refer to kinetic energy in its modern sense, in 1802. (from History of energy) -
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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Net metering, unlike a feed-in tariff, requires only one meter, but it must be bi-directional. (from Solar power) -
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) -
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) -
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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) -
Natural gas extraction by countries in cubic meters per year around 2013 (from Natural gas) -
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) -
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) -
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Olkiluoto 3 under construction in 2009. It was the first EPR, a modernized PWR design, to start construction. (from Nuclear power) -
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) -
Schematic flow diagram of a typical crude oil distillation unit as used in petroleum crude oil refineries (from Oil refinery) -
Activity of spent UOx fuel in comparison to the activity of natural uranium ore over time (from Nuclear power) -
Yearly solar generation by continent (from Solar power) -
The status of nuclear power globally (click for legend) (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) -
North America (from Solar power) -
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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) -
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) -
Burning of natural gas coming out of the ground (from Natural gas) -
Battery storage facility -
The U.S. and Russia have been the predominant producers of natural gas. (from Natural gas) -
Growth of worldwide nuclear power generation (from Nuclear power) -
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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) -
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) -
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) -
The Leibstadt Nuclear Power Plant in Switzerland (from Nuclear power) -
The growth of solar PV on a semi-log scale since 1996 (from Solar power) -
Manhole for domestic gas supply, London, UK (from Natural gas) -
Installed geothermal energy capacity, 2022 (from Geothermal power) -
Yearly hydro generation by continent (from Hydroelectricity) -
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The guided-missile cruiser USS Monterey (CG 61) receives fuel at sea (FAS) from the Nimitz-class aircraft carrier USS George Washington (CVN 73). (from Nuclear power) -
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) -
Electrified transport and renewable energy are key areas of investment for the renewable energy transition. (from Sustainable energy) -
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Share of electricity production from nuclear, 2023 (from Nuclear power) -
Part of the 354 MW Solar Energy Generating Systems (SEGS) parabolic trough solar complex in northern San Bernardino County, California (from Solar power) -
A parabolic collector concentrates sunlight onto a tube in its focal point. (from Solar power) -
Australia (from Solar power) -
A photovoltaic power station in California, United States -
The multi-mission radioisotope thermoelectric generator (MMRTG), used in several space missions such as the Curiosity Mars rover (from Nuclear power) -
Oil refinery in Iran (from Oil refinery)
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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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