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Introduction
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In physics, 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).
Common 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, and the internal energy contained within a thermodynamic system. All living organisms constantly take in and release energy.
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.
Human civilization requires energy to function, which it gets from energy resources such as fossil fuels, nuclear fuel, or renewable energy. The Earth's climate and ecosystems processes are driven by the energy the planet receives from the Sun (although a small amount is also contributed by geothermal energy). (Full article...)
Selected article
Coal supplies over a quarter of Turkey's primary energy. The heavily subsidised coal industry generates over a third of the country's electricity and emits a third of Turkey's greenhouse gases.
Coal is a major contributor to air pollution, and damages health across the nation, being burnt even in homes and cities. It is estimated that a phase out of coal power in Turkey by 2030 instead of by the 2050s would save over 100 thousand lives. Flue gas emission limits are in place, but data from mandatory reporting is not made public. (Full article...)
Selected image
Photo credit: Björn Appel
A solar furnace can be used to generate electricity, melt steel or make hydrogen fuel.
Did you know?
- The development of renewable energy in Iceland means that by 2050 the country should be the world's first zero-carbon economy?
- World's two largest oil shale-fired power plants (Narva Power Plants) generate more than 90% of power in Estonia?
- NW Natural in Portland, Oregon was the first gas company in the Pacific Northwest region of the United States when it started in 1859?
- The Assistant Secretary of Energy for Fossil Energy is responsible for America's Strategic Petroleum Reserve?
- Despite declines in production in recent years, Victoria still produces almost 20% of Australia's crude oil?
- 4.26 million tonnes of the sun are converted to energy every second by nuclear fusion?
- The first gasworks in the United Kingdom was built by the Gas Light and Coke Company, incorporated by Royal Charter in 1812?
- The Baku-Tbilisi-Ceyhan pipeline was a central plot point in the James Bond film The World Is Not Enough?
Selected biography
Born in Ireland, Thomson studied at the University of Glasgow, Scotland. On graduating, he became a mathematics teacher at the Royal Belfast Academical Institution. During his life Thomson published more than 600 scientific papers and filed over 70 patents.
As early as 1845 Thomson pointed out that the experimental results of William Snow Harris were in accordance with the laws of Coulomb. Over the period 1855 to 1867, Thomson collaborated with Peter Guthrie Tait the Treatise on Natural Philosophy that unified the various branches of physical science under the common principle of energy. His inventions included the current balance for the precise specification of the ampere, the standard unit of electric current.
In 1893, Thomson headed an international commission to decide on the design of the Niagara Falls power station. Despite his previous belief in the superiority of direct current electric power transmission, he agreed to use alternating current after seeing a Westinghouse demonstration at the Chicago World's Fair.
In the news
- 9 September 2023 – Russian invasion of Ukraine
- The International Atomic Energy Agency warns of a nuclear threat at the Zaporizhzhia Nuclear Power Plant after explosions were heard near the plant amidst the Ukrainian counteroffensive. (PBS News)
- 28 August 2023 – Russian Invasion of Ukraine
- The International Atomic Energy Agency warns that Ukraine's offensive in Zaporizhzhia Oblast has increased the risk of damage to the Zaporizhzhia Nuclear Power Plant. (Al Jazeera)
General images
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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)
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Death rates from air pollution and accidents related to energy production, measured in deaths in the past per terawatt hours (TWh) (from Nuclear power)
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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)
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Cooling towers at a geothermal power plant in Larderello, Italy
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Anti-nuclear protest near nuclear waste disposal centre at Gorleben in northern Germany (from Nuclear power)
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The evolution of solar power production by region (from Solar power)
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A parabolic collector concentrates sunlight onto a tube in its focal point. (from Solar power)
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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)
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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)
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South and South-East Asia (from Solar power)
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Pile of asphalt-covered aggregate for formation into asphalt concrete (from Oil refinery)
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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)
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Schematic of the ITER tokamak under construction in France (from Nuclear power)
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Polyethylene plastic main being placed in a trench (from Natural gas)
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Sample of gasoline (from Oil refinery)
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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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Museum Hydroelectric power plant "Under the Town" in Užice, Serbia, built in 1900. (from Hydroelectricity)
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Cylinders of liquified petroleum gas (from Oil refinery)
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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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Measurement of the tailrace and forebay rates at the Limestone Generating Station in Manitoba, Canada. (from Hydroelectricity)
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Schematics of a grid-connected residential PV power system (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)
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Guri Dam, a hydroelectric dam in Venezuela (from Sustainable energy)
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Manhole for domestic gas supply, London, UK (from Natural gas)
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Schematic flow diagram of a typical natural gas processing plant (from Natural gas)
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Africa and Middle East (from Solar power)
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The Leibstadt Nuclear Power Plant in Switzerland (from Nuclear power)
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Sulphur (from Oil refinery)
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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)
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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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A gas bill from Baltimore, Maryland, 1834, for manufactured coal gas, before the introduction of ground-extracted methane gas. (from Natural gas)
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The location of shale gas compared to other types of gas deposits (from Natural gas)
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Battery storage facility
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Construction of the Salt Tanks which provide efficient thermal energy storage so that output can be provided after sunset, and output can be scheduled to meet demand requirements. The 280 MW Solana Generating Station is designed to provide six hours of energy storage. This allows the plant to generate about 38% of its rated capacity over the course of a year. (from Solar power)
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A sugarcane plantation to produce ethanol in Brazil (from Sustainable energy)
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Ivanpah Solar Electric Generating System with all three towers under load during February 2014, with the Clark Mountain Range seen in the distance (from Solar power)
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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)
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motor oil (from Oil refinery)
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A geothermal power station in Negros Oriental, Philippines (from Geothermal power)
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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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Jamnagar Refinery, the world's largest oil refinery, in Gujarat, India (from Oil refinery)
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Sample of diesel fuel (from Oil refinery)
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Pico hydroelectricity in Mondulkiri, Cambodia (from Hydroelectricity)
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Europe (from Solar power)
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The Calder Hall nuclear power station in the United Kingdom, the world's first commercial nuclear power station. (from Nuclear power)
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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)
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Electricity production by source (from Solar power)
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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)
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Natural gas drilling rig in Texas, US (from Natural gas)
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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)
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Countries by natural gas proven reserves (2014), based on data from The World Factbook (from Natural gas)
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The status of nuclear power globally (click for legend) (from Nuclear power)
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Life-cycle greenhouse gas emissions of electricity supply technologies, median values calculated by IPCC (from Nuclear power)
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The Three Gorges Dam in Central China is the world's largest power-producing facility of any kind. (from Hydroelectricity)
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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)
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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)
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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)
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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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Sample of crude oil (petroleum) (from Oil refinery)
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Electrified transport and renewable energy are key areas of investment for the renewable energy transition. (from Sustainable energy)
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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)
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Natural gas processing plant in Aderklaa, Lower Austria (from Natural gas)
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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)
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Activity of spent UOx fuel in comparison to the activity of natural uranium ore over time (from Nuclear power)
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Oil refinery in Iran (from Oil refinery)
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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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Australia (from Solar power)
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A photovoltaic power station in California, United States
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Schematic flow diagram of a typical crude oil distillation unit as used in petroleum crude oil refineries (from Oil refinery)
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The Ffestiniog Power Station can generate 360 MW of electricity within 60 seconds of the demand arising. (from Hydroelectricity)
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A breakdown of the products made from a typical barrel of US oil (from Oil refinery)
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Net metering, unlike a feed-in tariff, requires only one meter, but it must be bi-directional. (from Solar power)
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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)
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Share of electricity production from hydropower, 2022 (from Hydroelectricity)
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Baton Rouge Refinery (the fifth-largest in the United States) (from Oil refinery)
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Fire-extinguishing operations after the Texas City Refinery explosion (from Oil refinery)
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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)
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Sample of kerosene (from Oil refinery)
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Storage tanks and towers at Shell Puget Sound Refinery (Shell Oil Company), Anacortes, Washington (from Oil refinery)
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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)
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The share of electricity production from solar, 2022 (from Solar power)
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Geothermal power center in the Usulután Department, El Salvador (from Geothermal power)
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North America (from Solar power)
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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)
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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)
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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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Growth of worldwide nuclear power generation (from Nuclear power)
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Wind turbines in Xinjiang, China
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Grangemouth Refinery, in Scotland (from Oil refinery)
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The growth of solar PV on a semi-log scale since 1996 (from Solar power)
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Gas network emergency vehicle responding to a major fire in Kyiv, Ukraine (from Natural gas)
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World map showing where people without access to electricity lived in 2016—mainly in sub-Saharan Africa and the Indian subcontinent (from Sustainable energy)
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South America (from Solar power)
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Natural gas burning on a gas stove (from Natural gas)
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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)
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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)
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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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Nuclear fuel assemblies being inspected before entering a pressurized water reactor in the United States (from Nuclear power)
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The multi-mission radioisotope thermoelectric generator (MMRTG), used in several space missions such as the Curiosity Mars rover (from Nuclear power)
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Anacortes Refinery, on the north end of March Point southeast of Anacortes, Washington, United States (from Oil refinery)
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Utility cycling infrastructure, such as this bike lane in Vancouver, encourages sustainable transport. (from Sustainable energy)
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The 120-MWe Nesjavellir power station in southwest Iceland (from Geothermal power)
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Installed geothermal energy capacity, 2022 (from Geothermal power)
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Natural gas extraction by countries in cubic meters per year around 2013 (from Natural gas)
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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)
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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)
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Global geothermal electric capacity. Upper red line is installed capacity; lower green line is realized production. (from Geothermal power)
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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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Share of electricity production from nuclear, 2022 (from Nuclear power)
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For cooking, electric induction stoves are one of the most energy-efficient and safest options. (from Sustainable energy)
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Most waste packaging, small-scale experimental fuel recycling chemistry and radiopharmaceutical refinement is conducted within remote-handled hot cells. (from Nuclear power)
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Comparison of natural gas prices in Japan, United Kingdom, and United States, 2007–2011 (from Natural gas)
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Trends in the top five hydroelectricity-producing countries (from Hydroelectricity)
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Trends in the top five geothermal electricity-generating countries, 1980–2012 (US EIA) (from Geothermal power)
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Dry cask storage vessels storing spent nuclear fuel assemblies (from Nuclear power)
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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)
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Refinery, Bayport Industrial Complex, Harris County, Texas (from Oil refinery)
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Neste Oil refinery in Porvoo, Finland (from Oil refinery)
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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) -
A micro-hydro facility in Vietnam (from Hydroelectricity)
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Thomas Young - the first to use the term "energy" in the modern sense, in 1802. (from History of energy)
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A pipeline odorant injection station (from Natural gas)
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US Natural Gas Marketed Production 1900 to 2012 (US EIA data) (from Natural gas)
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Seasonal cycle of capacity factors for wind and photovoltaics in Europe 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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A Washington, D.C. Metrobus, which runs on natural gas (from Natural gas)
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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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Burning of natural gas coming out of the ground (from Natural gas)
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Construction close to high pressure gas transmission pipelines is discouraged, often with standing warning signs. (from Natural gas)
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Refinery of Slovnaft in Bratislava (from Oil refinery)
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The Ikata Nuclear Power Plant, a pressurized water reactor that cools by utilizing a secondary coolant heat exchanger with a large body of water, an alternative cooling approach to large cooling towers (from Nuclear power)
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Trends in the top five natural gas-producing countries (US EIA data) (from Natural gas)
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The town of Pripyat abandoned since 1986, with the Chernobyl plant and the Chernobyl New Safe Confinement arch in the distance (from Nuclear power)
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Quotations
- "If we already have the Kyoto protocol, why invent another proposal and not just implement one that already exists? If a country is incapable of implementing the result of an international treaty that has established rules and regulations, it won't end up implementing those rules voluntarily."" – Luiz Inácio Lula da Silva, 2007
- "Climate change is a challenge China must cope with to realize sustainable development... Implementing a climate change containment policy may cost a fortune, but the cost will be even higher if we delay. Early action is imperative." – Ma Kai, 2007
- "The consequences of restricting the development of developing nations will be much more serious than the consequences of global warming." – Ma Kai, 2007
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