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Introduction

A plasma globe, using electrical energy to create plasma, light, heat, movement and a faint sound

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

The internal combustion engine is widely used to power a great variety of vehicles and other devices. It is an engine in which the burning of a fuel occurs in a confined space called a combustion chamber. This exothermic reaction of a fuel with an oxidizer creates gases of high temperature and pressure, which are permitted to expand.

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: Johnson Space Center/NASA
Tropical cyclones feed on the heat released when moist air rises and the water vapor condenses.

Did you know?

• During World War I, the German Army produced shale oil from Yarmouk oil shale deposits in Jordan to operate the Hijazi Railway (pictured)?

• Dennis Spurgeon, formerly chief operating officer at uranium supplier USEC Inc., became the United States Assistant Secretary for Nuclear Energy in 2006?

• Japan Canada Oil Sands Limited was the first offshore oil company to exploit the Athabasca oil sands in Canada?

• Teesside Power Station is the largest combined-cycle gas turbine (CCGT) plant in Europe.?

• The Klaipėda Geothermal Demonstration Plant in Lithuania was the first geothermal plant in the Baltic Sea region?

• Hitachi Zosen Corporation built the first oil tanker in Japan in 1908 per an order by Standard Oil Company?

• Coalbed methane is a form of natural gas extracted from coal beds?

• When constructed in 1906, the Baku–Batumi pipeline was the world's longest kerosene pipeline?

Selected biography

Thomas Alva Edison (February 11, 1847 – October 18, 1931) was an American inventor and businessman who developed many devices which greatly influenced life worldwide into the 21st century. Dubbed "The Wizard of Menlo Park" by a newspaper reporter, he was one of the first inventors to apply the principles of mass production to the process of invention, and can therefore be credited with the creation of the first industrial research laboratory.

Edison invented the first commercially practical electric light bulb which, by 1879 would burn for hundreds of hours. He was able to sell the concept to homes and businesses by mass-producing them and creating a complete system for the generation and distribution of electricity.

Edison patented an electric distribution system in 1880, and in January 1882 he switched on the first steam generating power station at Holborn Viaduct in London, UK. The direct current (DC) supply system provided electricity supplies to street lamps and a number of private dwellings within a short distance of the station. The first investor-owned electric utility, Pearl Street Station, New York City, started generating on September 4, 1882, providing 110 volts direct current to 59 customers in lower Manhattan.

Life magazine (USA), in a special double issue, placed Edison first in the list of the "100 Most Important People in the Last 1000 Years," noting that the light bulb he promoted "lit up the world." He was ranked thirty-fifth on Michael H. Hart's list of the most influential figures in history.

In the news

1 June 2024 – Russian invasion of Ukraine

Russia launches missile and drone strikes across Ukraine, injuring at least four people and damaging critical infrastructure, including energy facilities. Ukraine says that it shot down 35 of 53 missiles and 46 of 47 drones. (Reuters)

General images

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

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  Pico hydroelectricity in Mondulkiri, Cambodia (from Hydroelectricity)
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  Share of electricity production from hydropower, 2022 (from Hydroelectricity)
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  Map of solar resources from World bank (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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  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)
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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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  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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  Geothermal generation by country, 2021 (from Geothermal 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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  For cooking, electric induction stoves are one of the most energy-efficient and safest options. (from Sustainable energy)
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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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  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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  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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  Electrified transport and renewable energy are key areas of investment for the renewable energy transition. (from Sustainable energy)
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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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  The location of shale gas compared to other types of gas deposits (from Natural gas)
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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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  Polyethylene plastic main being placed in a trench (from Natural gas)
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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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  South and South-East Asia (from Solar power)
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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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  Yearly geothermal generation by continent (from Geothermal power)
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  A sugarcane plantation to produce ethanol in Brazil (from Sustainable energy)
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  Neste Oil refinery in Porvoo, Finland (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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  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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  Construction close to high pressure gas transmission pipelines is discouraged, often with standing warning signs. (from Natural gas)
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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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  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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  Net metering, unlike a feed-in tariff, requires only one meter, but it must be bi-directional. (from Solar power)
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  Benefitting from favorable policies and declining costs of modules, photovoltaic solar installation has grown consistently, with China expected to account for 50% of new global solar photovoltaic projects by 2024. (from Solar power)
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  Hydro generation by country, 2021 (from Hydroelectricity)
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  Schematic flow diagram of a typical natural gas processing plant (from Natural gas)
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  A photovoltaic power station in California, United States
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  Grangemouth Refinery, in Scotland (from Oil refinery)
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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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  US Natural Gas Marketed Production 1900 to 2012 (US EIA data) (from Natural gas)
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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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  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)
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  Electricity production by source (from Solar power)
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  Trends in the top five natural gas-producing countries (US EIA data) (from Natural gas)
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  Utility cycling infrastructure, such as this bike lane in Vancouver, encourages sustainable transport. (from Sustainable energy)
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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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  The share of electricity production from solar, 2022 (from Solar 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)
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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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  Dry cask storage vessels storing spent nuclear fuel assemblies (from Nuclear power)
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  Yearly hydro generation by continent (from Hydroelectricity)
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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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  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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  Refinery, Bayport Industrial Complex, Harris County, Texas (from Oil refinery)
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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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  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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  A pipeline odorant injection station (from Natural gas)
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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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  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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  Cracks at the historic Town Hall of Staufen im Breisgau presumed due to damage from geothermal drilling (from Geothermal power)
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  Trends in the top five geothermal electricity-generating countries, 1980–2012 (US EIA) (from Geothermal power)
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  Share of electricity production from nuclear, 2022 (from Nuclear power)
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  Oil refinery in Iran (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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  Storage tanks and towers at Shell Puget Sound Refinery (Shell Oil Company), Anacortes, Washington (from Oil refinery)
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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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  Measurement of the tailrace and forebay rates at the Limestone Generating Station in Manitoba, Canada. (from Hydroelectricity)
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  Sample of crude oil (petroleum) (from Oil refinery)
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  Fire-extinguishing operations after the Texas City refinery explosion (from Oil refinery)
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  Refinery of Slovnaft in Bratislava (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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  A micro-hydro facility in Vietnam (from Hydroelectricity)
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  A Washington, D.C. Metrobus, which runs on natural gas (from Natural gas)
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  Natural gas extraction by countries in cubic meters per year around 2013 (from Natural gas)
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  Museum Hydroelectric power plant "Under the Town" in Užice, Serbia, built in 1900. (from Hydroelectricity)
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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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  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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  Anti-nuclear protest near nuclear waste disposal centre at Gorleben in northern Germany (from Nuclear power)
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  Deaths caused by use of fossil fuels such as natural gas (areas of rectangles in chart) greatly exceed those resulting from production of renewable energy (rectangles barely visible in chart). (from Natural gas)
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  Cylinders of liquified petroleum gas (from Oil refinery)
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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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  Natural gas processing plant in Aderklaa, Lower Austria (from Natural gas)
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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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  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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  Countries by natural gas proven reserves (2014), based on data from The World Factbook (from Natural gas)
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  Burning of natural gas coming out of the ground (from Natural gas)
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  The status of nuclear power globally (click for legend) (from Nuclear power)
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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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  Ivanpah Solar Electric Generating System with all three towers under load (from Solar power)
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  A breakdown of the products made from a typical barrel of US oil (from Oil refinery)
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  Battery storage facility
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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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  Cooling towers at a geothermal power plant in Larderello, Italy
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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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  Gas network emergency vehicle responding to a major fire in Kyiv, Ukraine (from Natural gas)
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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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  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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  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)
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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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  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 Leibstadt Nuclear Power Plant in Switzerland (from Nuclear power)
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  Baton Rouge Refinery (the fifth-largest in the United States) (from Oil refinery)
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  North America (from Solar power)
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  Natural gas burning on a gas stove (from Natural gas)
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  motor oil (from Oil refinery)
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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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  Sulphur (from Oil refinery)
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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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  Installed geothermal energy capacity, 2022 (from Geothermal power)
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  Jamnagar Refinery, the world's largest oil refinery, in Gujarat, India (from Oil refinery)
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  A geothermal power station in Negros Oriental, Philippines (from Geothermal power)
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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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  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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  Africa and Middle East (from Solar power)
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  Pile of asphalt-covered aggregate for formation into asphalt concrete (from Oil refinery)
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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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  Guri Dam, a hydroelectric dam in Venezuela (from Sustainable energy)
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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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  Community solar farm in the town of Wheatland, Wisconsin (from Solar power)
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  Geothermal power center in the Usulután Department, El Salvador (from Geothermal 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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  Schematic of the ITER tokamak under construction in France (from Nuclear 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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  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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  Sample of diesel fuel (from Oil refinery)
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  Manhole for domestic gas supply, London, UK (from Natural gas)
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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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  Natural gas drilling rig in Texas, US (from Natural gas)
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  Wind turbines in Xinjiang, China
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  Europe (from Solar power)
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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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  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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  The 120-MW_e Nesjavellir power station in southwest Iceland (from Geothermal 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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  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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  Schematics of a grid-connected residential PV power system (from Solar power)
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  Sample of gasoline (from Oil refinery)
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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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  Sample of kerosene (from Oil refinery)
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  South America (from Solar power)
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  Yearly solar generation by continent (from Solar power)
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  The Ffestiniog Power Station can generate 360 MW of electricity within 60 seconds of the demand arising. (from Hydroelectricity)

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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