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Delek US
Delek US is an American diversified downstream energy company based in Brentwood, Tennessee, operating four refineries in Texas, Arkansas, and Louisiana with a combined capacity of 302,000 barrels per day.
Delfin LNG
Delfin LNG is a US deepwater port project for liquefying and exporting natural gas in the Gulf of Mexico off Louisiana, licensed in March 2025.
Delhi Transco
Delhi Transco Limited, also known as DTL, is the Delhi government's state transmission utility, formed on 1 July 2002 from the unbundled Delhi Vidyut Board, operating Delhi's extra-high-voltage grid.
Delilah I Solar Energy Center
Delilah I Solar Energy Center is a 300-megawatt utility-scale solar power plant in Northeast Texas that sells its output to Honda and Tesla under 15-year contracts.
Delimara FSRU
The Delimara FSRU is the floating LNG import facility at Delimara, Marsaxlokk, Malta, which since 2017 has supplied natural gas to the Delimara power stations, pairing a moored LNG storage vessel with an onshore regasification plant.
Dellka / Delan Minghai
Dellka / Delan Minghai, legally 深圳市德兰明海新能源股份有限公司, is a Shenzhen energy-storage company founded in 2013 by Yin Xiangzhu, known internationally for its BLUETTI brand of portable power stations and home storage systems.
Delmarva Power & Light
Delmarva Power & Light Company is an Exelon-owned utility based in Wilmington, Delaware, serving about 532,000 electric customers on the Delmarva Peninsula and 136,000 gas customers in northern Delaware.
Delong Nickel Phase II power station
The Delong Nickel Phase II power station is a 1,840 MW captive coal-fired power station in Kendari, Sulawesi, Indonesia, built to power Delong's nickel smelting complex.
Delta Oil Pipeline (United States)
The Delta Oil Pipeline is a Shell-owned crude oil pipeline carrying Heavy Louisiana Sweet crude from the eastern Gulf of Mexico to Louisiana terminals and refineries.
Demand response
Demand response is the reduction or shift in electricity consumption by customers in response to price signals, incentive payments, or grid reliability needs, helping balance supply and demand.
Demand-controlled ventilation
Demand-controlled ventilation (DCV) automatically adjusts a building's outdoor air supply to match actual need, usually measured by CO2 sensors, avoiding over-ventilation of partly occupied spaces.
DEME
DEME, formally DEME Group NV, is a Belgian marine engineering and dredging contractor with about 6,000 employees that provides dredging, offshore wind installation, and environmental services worldwide.
Demethanizer
A demethanizer is a cryogenic distillation column used in natural gas and LNG processing to remove methane overhead, leaving ethane and heavier hydrocarbons as NGL bottoms.
Dendrite penetration in solid electrolytes
Dendrite penetration in solid electrolytes is the growth of lithium metal filaments through the ceramic electrolyte of an all-solid-state battery, which short-circuits the cell and remains a leading obstacle to commercialization.
Dengfeng-2 power station
Dengfeng-2 power station (华润电力登封发电厂) is a four-unit, 1,900 MW coal-fired power station in Dengfeng County, Zhengzhou, Henan, China, owned and operated by China Resources Power.
Denise Gray
Denise Gray is an American engineer nicknamed the "Battery Czar" who developed electric-vehicle lithium-ion batteries at General Motors and led LG Energy Solution's North American operations.
Denison Mines
Denison Mines Corp. is a Toronto-based Canadian uranium mining and development company focused on Saskatchewan's Athabasca Basin, with the Wheeler River project as its flagship asset.
Denisovsky Vostochny Coal Mine
Denisovsky Vostochny Coal Mine (шахта «Восточная Денисовская») is an underground coking coal mine in the Neryungri District of Yakutia, Russia, commissioned in 2021 with a capacity of 4 million tonnes per year.
Dennis A. Woodford
Dennis A. Woodford is a Canadian power systems engineer from Winnipeg, Manitoba, who created the EMTDC/PSCAD simulation software, co-founded Electranix Corporation, and was elected to the US National Academy of Engineering in 2017.
Dense plasma focus
A dense plasma focus (DPF) is a pulsed plasma device whose coaxial accelerator compresses plasma into an extremely dense pinch, producing intense pulses of neutrons and x rays.
Deoxo reactor
A deoxo reactor is a catalytic vessel that removes oxygen from gas streams by reacting it with hydrogen over a platinum or palladium catalyst, converting the two gases to water.
Department for Energy Security and Net Zero
The Department for Energy Security and Net Zero (DESNZ) is a UK government department responsible for energy security, protecting billpayers, and delivering the transition to net zero emissions.
Department of Atomic Energy (परमाणु ऊर्जा विभाग)
The Department of Atomic Energy (परमाणु ऊर्जा विभाग) is a Government of India department, established in 1954 under the Prime Minister, responsible for nuclear power, isotope technologies, and research.
Department of Energy Loan Programs Office
The Department of Energy Loan Programs Office (LPO) provides federal loans and loan guarantees to innovative energy ventures, renamed the Office of Energy Dominance Financing in 2025.
Depth of discharge
Depth of discharge (DoD) is the percentage of a battery's rated capacity removed during a discharge, the complement of state of charge, and a central factor in cycle life.
Design-basis accident
A design-basis accident (DBA) is a postulated accident a nuclear facility is designed to withstand through conservative analysis, with radioactive releases kept within acceptable limits and no significant radiological consequences.
Destabilized hydride systems
Destabilized hydride systems are mixtures of two or more metal hydrides that release hydrogen at lower temperatures because dehydrogenation forms a stable compound, such as MgB₂ in the LiBH₄–MgH₂ system.
Destin Gas Pipeline
The Destin Gas Pipeline is a 255-mile natural gas pipeline carrying offshore Gulf of Mexico gas to Pascagoula, Mississippi, and north through the state, in service since 1998.
Dětmarovice Power Station
The Dětmarovice Power Station (Elektrárna Dětmarovice) is a power and heating plant in Dětmarovice in the Czech Republic's Moravian-Silesian Region, built between 1971 and 1976.
Dhamra LNG Terminal
The Dhamra LNG Terminal is a liquefied natural gas import terminal at Dhamra Port, Odisha, India, commissioned in 2023 and owned by Adani and TotalEnergies.