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Enhanced Frequency Response (National Grid)
Enhanced Frequency Response (EFR) was a fast, sub-second frequency response service tendered by National Grid in Great Britain, awarding 200 MW of battery storage contracts in 2016.
Eni
Eni, originally Ente Nazionale Idrocarburi, is an Italian integrated energy company founded in 1953 under Enrico Mattei, controlled by the Italian state and operating in 62 countries.
Enka Gebze power station
The Enka Gebze power station is a 1,600 MW natural gas-fired combined cycle plant in Sakarya, Türkiye, developed and operated by ENKA and commissioned in 2002.
ENKA İnşaat ve Sanayi
ENKA İnşaat ve Sanayi is a Turkish construction and energy conglomerate founded in Istanbul in 1957 and Türkiye's largest construction company, with 5,000 MW of gas-fired power capacity.
Enka İzmir power station
The Enka İzmir power station is a natural gas-fired combined cycle power plant in İzmir, Türkiye, owned and operated by ENKA with a capacity of 1,580 MW.
EnLink Midstream
EnLink Midstream was a Dallas-based midstream energy company formed in 2014 from Devon Energy and Crosstex assets, providing natural gas, NGL, and crude services until ONEOK acquired it in 2025.
Enlow Fork Coal Mine
The Enlow Fork Coal Mine is an underground longwall coal mine in Washington County, Pennsylvania, owned by Consol Pennsylvania Coal Company, a subsidiary of Core Natural Resources.
ENMAX
ENMAX Corporation is a Canadian electricity utility holding company, wholly owned by the City of Calgary since 1998, operating regulated wires in Calgary and Maine, plus generation and retail.
Ennore LNG Terminal
The Ennore LNG Terminal is an LNG import, storage, and regasification terminal at Kamarajar Port near Chennai, Tamil Nadu, and the first LNG terminal on India's eastern coast.
Enovix
Enovix is an American Silicon Valley battery manufacturer founded in 2007 that makes lithium-ion batteries with a 100% active silicon anode, targeting smartphones, wearables, and defense.
Enphase Energy
Enphase Energy is a Fremont, California energy technology company founded in 2006 by Raghu Belur and Martin Fornage, which has shipped about 87.8 million microinverters to systems in over 165 countries.
Enping 23-1 Oil Field
Enping 23-1 (恩平23-1) is an offshore oil field in the Pearl River Mouth Basin, South China Sea, operated by CNOOC, which began production in 2017.
Enquest
EnQuest PLC is a British independent oil and gas company focused on mature, late-life assets in the UK North Sea and South East Asia, listed in London.
Ensign Energy Services
Ensign Energy Services is a Calgary-based oilfield services company, incorporated in 1987, providing land-based contract drilling and well servicing to oil and gas industries in Canada, the United States, and internationally.
Ensyn
Ensyn Corporation is a private renewable fuels and chemicals company headquartered in Ottawa, Ontario, that converts woody biomass into liquid biocrude using its proprietary Rapid Thermal Processing fast pyrolysis technology.
Entergy
Entergy is a New Orleans-based Fortune 500 electric utility holding company that generates, transmits, and distributes power to more than 3 million customers in four Gulf South states.
Entergy Arkansas
Entergy Arkansas is a regulated electric utility, a subsidiary of Entergy Corporation, that serves about 738,000 customers in 63 Arkansas counties, tracing to Arkansas Power and Light.
Entergy Louisiana
Entergy Louisiana is an electric and natural gas utility subsidiary of Entergy Corporation, serving about 1.1 million customers in 58 of Louisiana's 64 parishes plus gas customers in Baton Rouge.
Entergy Mississippi
Entergy Mississippi, LLC is an investor-owned electric utility, founded in 1923, serving about 459,000 customers in 45 Mississippi counties as a subsidiary of Entergy Corporation.
Entergy New Orleans
Entergy New Orleans is an electric utility and Entergy Corporation subsidiary serving about 209,000 customers in New Orleans, Louisiana, regulated by the City Council rather than the state.
Entergy Texas
Entergy Texas, Inc. is a regulated electric utility subsidiary of Entergy Corporation serving about 538,000 customers across 27 counties in eastern and southeastern Texas from headquarters in Beaumont.
Enterprise Products Partners
Enterprise Products Partners (NYSE: EPD) is a Houston-based master limited partnership providing midstream energy services to producers and consumers across North America; its origins trace to a 1968 company founded by Dan Duncan.
Entice Oil and Gas Field
Entice is a designated oil and gas field in central Alberta, south of Strathmore, known as the site of Canada's first demonstration-scale commercial coalbed methane project, begun in 2003.
Entidade Reguladora dos Serviços Energéticos
The Entidade Reguladora dos Serviços Energéticos (ERSE), Portugal's independent energy regulator since 1997, regulates electricity, natural gas, LPG, petroleum-derived fuels, and biofuels, setting regulated tariffs and supervising energy markets.
Entrained-flow gasifier
An entrained-flow gasifier is a gasification reactor in which finely pulverized fuel and oxygen react co-currently at high temperature, giving tar-free syngas, over 95% carbon conversion, and slag removal.
ENTSO-E
ENTSO-E, the European Network of Transmission System Operators for Electricity, is the Brussels-based association of 40 electricity TSOs from 36 countries, created under EU law in 2009.
Envestra
Envestra was an Australian natural gas distributor, headquartered in Adelaide and ASX-listed from 1997, serving about 1.2 million consumers across five states and territories before its 2014 takeover by the Cheung Kong Consortium.
Environment Act 2021
The Environment Act 2021 is a UK Act of Parliament that creates a post-Brexit framework for environmental governance, covering waste, air quality, water, and biodiversity.
Environmental impact of nuclear power
Environmental effects of nuclear power: the environmental impact of nuclear power spans uranium mining, plant operation and cooling, radioactive waste, and accidents, with very low lifecycle carbon emissions.
Environmental technology
Environmental technology, also called green or clean technology, is the development of technologies that protect the environment, pollute less, recycle more, and handle waste sustainably, a field defined by the 1992 Rio Earth Summit's Agenda 21.