Portal:Energy
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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
Nuclear (fission) power stations, provided 11% of the world's electricity in 2012, somewhat less than that generated by hydro-electric stations at 16%. Nuclear energy policy differs between countries, and some countries have no active nuclear power stations, or have phased them out. The first nuclear generated electricity, used to power four 200-watt light bulbs, was produced at the EBR-I reactor near Arco, Idaho, in 1951. This was followed in 1954 by the first grid-connected plant (in the USSR), and in 1956 by the first commercial plant (in the United Kingdom).
During the last decades of the 20th century, concerns about nuclear waste, nuclear accidents, radiation and nuclear proliferation led to an anti-nuclear movement. The 1979 Three Mile Island accident, the 1986 Chernobyl disaster, and the 2011 Fukushima disaster also played a part in stopping new plants in many countries, while the economics of nuclear generation and of nuclear decommissioning have also been factors. Despite this, some countries including China and India have continued to remain active in developing nuclear power, Germany will close its 19 nuclear plants by 2020, and is investing heavily in renewable energy commercialization instead.
Selected image
Photo credit: United States Department of Energy
The fireball created as energy is released in a nuclear explosion.
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
Hansen studied at the University of Iowa, obtaining a B.A. in Physics and Mathematics, an M.S. in Astronomy and a Ph.D. in Physics. He was elected to the National Academy of Sciences in 1996 and received the Heinz Environment Award for his research on global warming in 2001.
Hansen is a vocal critic of the Bush Administration's ideology on climate change. In 2005 and 2006, he claimed that NASA administrators have tried to influence his public statements about the causes of climate change. He has also claimed that the White House edited climate-related press releases from federal agencies to make global warming seem less threatening, and that he is unable to speak 'freely', without the backlash of other government officials.
Hansen has said that a global tipping point will be reached by 2016 if levels of greenhouse gases are not reduced. After this point global warming becomes unstoppable. As a result he claims that there may be a rise in sea levels by as much as 10 feet (3 metres) by 2100.
In the news
- 25 January 2023 – Iran and weapons of mass destruction
- International Atomic Energy Agency Director General Rafael Grossi says that Iran has now amassed enough material for "several nuclear weapons", and calls for new diplomatic efforts in order to prevent Iran from developing a nuclear bomb. (CNN)
- 23 January 2023 –
- A major power outage in Pakistan leaves nearly 220 million people without electricity after a failure at the national power grid. Earlier this month, Prime Minister Shehbaz Sharif ordered a reduction in energy consumption as the country faces a severe energy crisis. (CNN) (Reuters)
General images
The following are images from various energy-related articles on Wikipedia.
Larderello Geothermal Station, in Italy (from Geothermal power)
Fire-extinguishing operations after the Texas City Refinery explosion (from Oil refinery)
Energy use in industry caused 24.2% of all GHG emissions in 2016. Energy use in buildings and transport caused 17.5% and 16.2% of emissions, respectively. Another 9.5% of emissions came from other energy uses and 5.8% were fugitive emissions from the production of fossil fuels. (from Sustainable energy)
The warming influence (called radiative forcing) of long-lived greenhouse gases has nearly doubled in 40 years, with carbon dioxide and methane being the dominant drivers of global warming. (from Natural gas)
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)
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)
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)
Anti-nuclear protest near nuclear waste disposal centre at Gorleben in northern Germany (from Nuclear power)
ExxonMobil oil refinery in Baton Rouge, Louisiana (the fifth-largest in the United States) (from Oil refinery)
Sample of kerosene (from Oil refinery)
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)
The town of Pripyat abandoned since 1986, with the Chernobyl plant and the Chernobyl New Safe Confinement arch in the distance (from Nuclear power)
The Ffestiniog Power Station can generate 360 MW of electricity within 60 seconds of the demand arising. (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).jpg.webp)
The evolution of solar power production by region (from Solar power)
South and South-East Asia (from Solar power)
The location of shale gas compared to other types of gas deposits (from Natural gas).jpg.webp)
The Calder Hall nuclear power station in the United Kingdom, the world's first commercial nuclear power station. (from Nuclear power)
Trends in the top five natural gas-producing countries (US EIA data) (from Natural gas)
The Three Gorges Dam in Central China is the world's largest power-producing facility of any kind. (from Hydroelectricity)
motor oil (from Oil refinery)
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)
Measurement of the tailrace and forebay rates at the Limestone Generating Station in Manitoba, Canada. (from Hydroelectricity)
Growth of renewables was 45% larger in 2020 compared to 2019, including a 90% rise in global wind capacity additions (green) and a 23% expansion of new solar photovoltaic installations (yellow). (from Sustainable energy)
Dry cask storage vessels storing spent nuclear fuel assemblies (from Nuclear power)
Battery storage facility
Schematics of a grid-connected residential PV power system (from Solar power)
Storage tanks and towers at Shell Puget Sound Refinery (Shell Oil Company), Anacortes, Washington (from Oil refinery)
A pipeline odorant injection station (from Natural gas)
Activity of spent UOx fuel in comparison to the activity of natural uranium ore over time (from Nuclear power)
The Leibstadt Nuclear Power Plant in Switzerland (from Nuclear power)
Sample of crude oil (petroleum) (from Oil refinery)
Trends in the top five geothermal electricity-generating countries, 1980–2012 (US EIA) (from Geothermal 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)
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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).svg.png.webp)
Countries by natural gas proven reserves (2014), based on data from The World Factbook (from Natural gas)
Africa and Middle East (from Solar power)
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, 2021 (from Nuclear power)
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)
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)
Trends in the top five hydroelectricity-producing countries (from Hydroelectricity)
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)
Share of electricity production from hydropower, 2021 (from Hydroelectricity).jpg.webp)
Construction of the Salt Tankswhich 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)
Construction close to high pressure gas transmission pipelines is discouraged, often with standing warning signs. (from Natural gas)
Sample of gasoline (from Oil refinery)
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)
The share of electricity production from solar, 2021 (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)
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)
South America (from Solar power)
Natural gas drilling rig in Texas, US (from Natural gas)
Burning of natural gas coming out of the ground in Taiwan (from Natural gas)
Schematic flow diagram of a typical crude oil distillation unit as used in petroleum crude oil refineries (from Oil refinery)
Electrified heat and transport are key areas of investment for the renewable energy transition. (from Sustainable energy)
Net metering, unlike a feed-in tariff, requires only one meter, but it must be bi-directional. (from Solar 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)
The status of nuclear power globally (click for legend) (from Nuclear 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)
A photovoltaic power station in California, United States
World map showing where people without access to electricity lived in 2016—mainly in sub-Saharan Africa and the Indian subcontinent (from Sustainable energy)
Anacortes Refinery (Marathon), on the north end of March Point southeast of Anacortes, Washington, United States (from Oil refinery)
Natural gas extraction by countries in cubic meters per year around 2013 (from Natural gas)
The growth of solar PV on a semi-log scale since 1992 (from Solar power)
Australia (from Solar power)
Natural gas processing plant in Aderklaa, Lower Austria (from Natural gas)
Oil refinery in Iran (from Oil refinery)
A breakdown of the products made from a typical barrel of US oil (from Oil refinery)
The Warwick Castle water-powered generator house, used for the generation of electricity for the castle from 1894 until 1940 (from Hydroelectricity)
Several countries and the European Union have committed to dates for all new cars to be zero-emissions vehicles. (from Sustainable energy)
Manhole for domestic gas supply, London, UK (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)
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)_conducts_a_fueling_at_sea_(FAS)_with_the_Nimitz-class_aircraft_carrier_USS_George_Washington_(CVN_73).jpg.webp)
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)
Cooling towers at a geothermal power plant in Larderello, Italy
Global geothermal electric capacity. Upper red line is installed capacity; lower green line is realized production. (from Geothermal power)
Growth of worldwide nuclear power generation (from Nuclear 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).jpg.webp)
USAID's Mission Director to Pakistan, John Groarke in a group photo with the live-line trainers for Energy Policy Program - September, 2015. (from Energy policy)
A parabolic collector concentrates sunlight onto a tube in its focal point. (from Solar power).jpg.webp)
Thomas Young - the first to use the term "energy" in the modern sense, in 1802. (from History of energy)
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)
Electricity production by source (from Solar power)
Wind turbines in Xinjiang, China
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)
Schematic flow diagram of a typical natural gas processing plant (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)
The multi-mission radioisotope thermoelectric generator (MMRTG), used in several space missions such as the Curiosity Mars rover (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)
Museum Hydroelectric power plant ″Under the Town″ in Užice, Serbia, built in 1900. (from Hydroelectricity)
Sulphur (from Oil refinery)
Natural gas burning on a gas stove (from Natural gas).svg.png.webp)
Death rates from air pollution and accidents related to energy production, measured in deaths in the past per terawatt hours (TWh) (from Nuclear power)
Most waste packaging, small-scale experimental fuel recycling chemistry and radiopharmaceutical refinement is conducted within remote-handled hot cells. (from Nuclear power)
Life-cycle greenhouse gas emissions of electricity supply technologies, median values calculated by IPCC (from Nuclear power)
North America (from Solar 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)
Comparison of natural gas prices in Japan, United Kingdom, and United States, 2007–2011 (from Natural gas)
US Natural Gas Marketed Production 1900 to 2012 (US EIA data) (from Natural gas)
Russia is a key oil and gas supplier to Europe (from Energy policy)
Sample of diesel fuel (from Oil refinery)
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)
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)
For cooking, electric induction stoves are one of the most energy-efficient and safest options. (from Sustainable energy)
Olkiluoto 3 under construction in 2009. It was the first EPR, a modernized PWR design, to start construction. (from Nuclear power)
A micro-hydro facility in Vietnam (from Hydroelectricity)
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)
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)
Refinery, Bayport Industrial Complex, Harris County, Texas (from Oil refinery)
Passive cooling features, such as these windcatcher towers in Iran, bring cool air into buildings without any use of energy. (from Sustainable energy)
Utility cycling infrastructure, such as this bike lane in Vancouver, encourages sustainable transport. (from Sustainable energy)
Europe (from Solar power)
Nuclear fuel assemblies being inspected before entering a pressurized water reactor in the United States (from Nuclear power)
Quotations
- "Our children will enjoy in their homes electrical energy too cheap to meter." – Lewis Lichtenstein Strauss, 1954
- "There is every possibility that you will soon be able to tax it." – Michael Faraday, talking to William Gladstone on the future purpose of electricity.
- "Higher energy prices act like a tax. They reduce the disposable income people have available for other things after they've paid their energy bills." – John W. Snow, 2005
- "Our dependence on foreign energy is like a foreign tax on the American people." – George W. Bush, 2005
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