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The Energy Portal
Welcome to Wikipedia's Energy portal, your gateway to energy. This portal is aimed at giving you access to all energy related topics in all of its forms.
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Energy Arc (central electrode of a Plasma Lamp).jpg
A plasma lamp, 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. It is a standard mechanical quantity. 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...)

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The 781 MW Roscoe Wind Farm at sunrise.
Wind power in Texas consists of many wind farms with a total installed nameplate capacity of 12,355 MW from over 40 different projects. Texas produces the most wind power of any U.S. state. Wind power accounted for 9% of the electricity generated in Texas during 2014.

The wind resource in many parts of Texas is very large. Farmers may lease their land to wind developers, creating a new revenue stream for the farm. The wind power industry is also creating thousands of jobs for local communities and for the state. Texas is seen as a profit-driven leader of renewable energy commercialization in the United States. The wind boom in Texas was assisted by expansion of the state’s Renewable Portfolio Standard, use of designated Competitive Renewable Energy Zones, expedited transmission construction, and the necessary Public Utility Commission rule-making.

The Roscoe Wind Farm (781 MW) is the state's largest wind farm. Other large wind farms in Texas include: Horse Hollow Wind Energy Center, Sherbino Wind Farm, Capricorn Ridge Wind Farm, Sweetwater Wind Farm, Buffalo Gap Wind Farm, King Mountain Wind Farm, Desert Sky Wind Farm, Wildorado Wind Ranch, and the Brazos Wind Farm.

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Sunspot TRACE.jpeg

Photo credit: NASA/TRACE
Plasma being channeled by the magnetic field loops of a sunspot.

Did you know?

SEGS solar power plant
  • The concentration of the greenhouse gas carbon dioxide has increased from about 280 parts per million to about 380 ppm since the start of the Industrial Revolution. That's an increase of 35.71%. The estimated population of the world in 1750 was 791 Million people. The estimated population of the world on June 30th, 2007 was 6.6 Billion people. That's an increase of 734.39%.?
  • In the 1990s Bougainville conflict, islanders cut off from oil supplies due to a blockade used coconut oil to fuel their vehicles?

Selected biography

William Thomson, 1st Baron Kelvin, OM, GCVO, PC, PRS, FRSE, (26 June 1824 – 17 December 1907), widely known for developing the Kelvin scale of absolute temperature measurement, was a mathematical physicist, engineer, and outstanding leader in the physical sciences of the 19th century. He did important work in the mathematical analysis of electricity and thermodynamics, and did much to unify the emerging discipline of physics in its modern form.

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

19 December 2022 – 2021–2022 global energy crisis
EU natural gas price cap
European Union member states agree to a natural gas price cap in an attempt to limit economic damage from the global energy crisis. The price cap can be triggered beginning on February 15, if for three days, prices on the TTF, which is the European natural gas benchmark, exceed 180 per megawatt-hour (MWh) and are also more than €35/MWh higher than a reference price based on liquefied natural gas price assessments. (Reuters)
13 December 2022 – Fusion power
The United States Department of Energy announces the achievement of fusion ignition by the National Ignition Facility at the Lawrence Livermore National Laboratory. ( (Reuters)
5 December 2022 – 2021–2022 global energy crisis
International sanctions during the 2022 Russian invasion of Ukraine
2022 Russian oil price cap

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