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Unión Eléctrica de Cuba
Unión Eléctrica de Cuba (UNE) is Cuba's state-owned electric utility, operating the national power system under the Ministry of Energy and Mines and facing repeated total grid collapses since 2024.
Union Oil Company of California
The Union Oil Company of California, known as Union Oil or Unocal, was an American oil company incorporated in Santa Paula in 1890 and acquired by ChevronTexaco in 2005.
Union power station
Union Power Station is a natural gas-fired combined-cycle power plant near El Dorado, Arkansas, completed in 2003 and, at about 1,980 MW, the largest power plant in Arkansas.
Unipro
Unipro (ПАО «Юнипро», Unipro PJSC) is a Russian thermal power generation company that operates five power plants with about 11.3 GW of capacity, and is majority-owned by Germany's Uniper SE.
Unit commitment
Unit commitment is an optimization method in power systems scheduling that decides which generators to switch on and at what output to meet demand at minimum cost.
Unit protection
Unit protection is power system protection that operates only for faults inside a clearly defined zone, such as a transformer or busbar, never for faults outside it.
United Energy Group
United Energy Group (联合能源集团) is a Hong Kong-listed independent energy company, founded by Chinese tycoon Zhang Hongwei, producing oil and gas in Pakistan, Egypt, and Iraq.
United Kingdom Atomic Energy Authority
The United Kingdom Atomic Energy Authority (UKAEA) is a UK government research organization, once developer of Britain's civil nuclear fission program and now centered on fusion energy research at Culham in Oxfordshire.
United Mine Workers of America
The United Mine Workers of America (UMWA) is a labor union founded in 1890 in Columbus, Ohio, that represents coal miners in the United States and Canada.
United Petroleum Development
United Petroleum Development Co., Ltd. is a Japanese oil exploration and production company, founded in 1970 and headquartered in Tokyo, owned by Cosmo, JX Nippon, and Mitsui.
United States Advanced Battery Consortium
The United States Advanced Battery Consortium (USABC) is a research organization founded by Chrysler, Ford, and General Motors in 1991 to develop batteries for electric vehicles.
United States Atomic Energy Commission
The United States Atomic Energy Commission was an independent federal agency, created in 1946 and abolished in 1975, that controlled nuclear weapons and regulated nuclear power.
United States Department of Energy
The United States Department of Energy (DOE) is a cabinet-level US department responsible for energy, environmental, and nuclear security policy, established by President Carter in 1977.
United States Department of Energy National Laboratories
The United States Department of Energy National Laboratories are a system of 17 government-owned research laboratories, stewarded by the Department of Energy, that trace their origin to the Manhattan Project.
United States naval reactors
United States naval reactors (US naval reactors) are the pressurized-water reactors powering US Navy nuclear submarines and aircraft carriers since USS Nautilus first went underway on nuclear power in 1955.
United States Nuclear Regulatory Commission
The United States Nuclear Regulatory Commission (NRC) is an independent federal agency that licenses and regulates civilian nuclear reactors and radioactive materials to protect public health and safety.
United Wambo Coal Mine
The United Wambo Coal Mine is an open-cut coal mine in the Hunter Valley of New South Wales, Australia, producing thermal and semi-soft metallurgical coal for export.
Unity oil field
The Unity oil field is an operating conventional oil field in Unity State, South Sudan, discovered in 1980 and producing since 1996 under the operator GPOC.
Universal Hydrogen
Universal Hydrogen was an American Los Angeles startup, founded in 2020, that developed hydrogen fuel cell propulsion for regional aircraft before shutting down in June 2024.
Unterweser nuclear power plant
The Unterweser nuclear power plant (Kernkraftwerk Unterweser) was a pressurized water reactor at Kleinensiel on the Weser river in Lower Saxony, Germany, shut down in March 2011 after Fukushima.
Unvinskoye oil field
Unvinskoye oil field (Уньвинское) is an operating oil field in Usolsky District, Perm Krai, Russia, discovered in 1980 and wholly owned by operator Lukoil-Perm, with reserves of about 166 million barrels.
UOX fuel
UOX fuel, short for uranium oxide fuel, is nuclear reactor fuel made of ceramic uranium dioxide pellets in zirconium alloy cladding tubes, the predominant fuel of the commercial nuclear industry.
Upgraded metallurgical-grade silicon
Upgraded metallurgical-grade silicon (UMG-Si) is silicon purified from metallurgical-grade silicon to solar grade using metallurgical methods instead of the chemical Siemens process, for solar cells.
Upper Big Branch Mine disaster
The Upper Big Branch Mine disaster was a coal mine explosion on April 5, 2010, in Montcoal, West Virginia, that killed 29 miners, the worst US coal mine disaster in 40 years.
Upper Silesian Coal Basin
The Upper Silesian Coal Basin, or USCB, is a large Carboniferous hard coal basin in southern Poland extending into the Czech Republic, one of Europe's most significant coal-producing regions.
Upper Zakum oil field
Upper Zakum is a giant offshore oil field 84 km northwest of Abu Dhabi, discovered in 1963 and the world's second largest offshore oil field.
Upper Zakum-Das Island Oil Pipeline
The Upper Zakum-Das Island Oil Pipeline is a 30-inch crude oil pipeline carrying 310,000 barrels per day from Abu Dhabi's Zakum field to Das Island, commissioned in 2001.
Upstream (petroleum industry)
Upstream is the segment of the petroleum industry covering exploration, extraction, and production of crude oil and natural gas, classified under NAICS 211 and followed by midstream and downstream refining.
Upstream Wind Energy Center
Upstream Wind Energy Center is a 202.5-megawatt wind farm in Antelope County, Nebraska, just north of Neligh, developed by Invenergy and operational since January 2019 with 81 GE turbines.
Ur-Energy Inc
Ur-Energy Inc. is a United States uranium mining company headquartered in Casper, Wyoming, that uses in-situ recovery at its Lost Creek facility, producing since 2013.