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DC disconnect switch
A DC disconnect switch, also called a DC isolator or PV disconnect, is a manually operated switch installed between a PV array and inverter for safe isolation.
DCP Midstream
DCP Midstream, LP was an American master limited partnership with natural gas gathering, processing, logistics, and marketing assets, and a major natural gas liquids producer acquired by Phillips 66 in 2023.
De Nora
De Nora, founded in Milan in 1923 by Oronzio De Nora, is an Italian multinational known for its DSA electrodes, water treatment, and green hydrogen technologies.
Dead lithium
Dead lithium is metallic lithium in a battery anode that has lost electrical contact with the current collector, causing capacity loss in lithium metal batteries; it can be partly recovered.
Dead-end clamp
A dead-end clamp, also called a strain or tension clamp, is overhead line hardware that terminates a conductor and carries its full tension into a pole or tower.
Deaerator
A deaerator is a mechanical device that removes dissolved gases, chiefly oxygen and carbon dioxide, from steam boiler feedwater by heating it with steam to prevent corrosion.
Decalin
Decalin, also known as decahydronaphthalene, is a bicyclic cycloalkane of two fused cyclohexane rings, used as a solvent, a high-cetane diesel component, and a hydrogen carrier.
Decay heat removal
Decay heat removal is the reactor safety function that carries away heat from radioactive decay in nuclear fuel after shutdown, from power operation through refuelling.
Declaration to Triple Nuclear Energy
The Declaration to Triple Nuclear Energy is a political pledge launched at COP28 in Dubai in 2023 to triple global nuclear capacity from 2020 levels by 2050.
Decline curve analysis
Decline curve analysis fits empirical decline models, chiefly the Arps equations, to a well's production rate history to forecast future output and estimate recoverable reserves, including in shale reservoirs.
Decommissioning trust fund
A decommissioning trust fund is a segregated account in which a nuclear plant licensee sets aside money to pay for the plant's eventual decontamination and dismantlement.
Decoupled water electrolysis
Decoupled water electrolysis is a water-splitting approach in which a redox mediator separates hydrogen and oxygen production in time or space, improving safety with intermittent renewable power.
Decoupled water splitting via redox mediators
Decoupled water splitting via redox mediators is an electrolysis strategy, proposed in 2013, in which a redox mediator lets hydrogen and oxygen form in separate steps, improving safety.
Decoupling (utility regulation)
Decoupling, also called revenue decoupling, is a utility regulatory mechanism that separates a utility's fixed-cost recovery from the volume of energy it sells, pioneered by California in 1978.
Deep borehole disposal
Deep borehole disposal is a concept for disposing of radioactive waste in boreholes drilled several kilometers into crystalline rock, sealing waste far deeper than mined repositories.
Deep energy retrofit
A deep energy retrofit (DER) is a whole-building renovation that cuts a building's energy use far more than a conventional retrofit, often by more than 50 percent.
Deep geological repository
A deep geological repository is an underground facility, typically several hundred meters deep, for permanent disposal of spent nuclear fuel and high-level waste using engineered and natural barriers, with Finland's Onkalo the first operating one.
Deep Heat Mining Basel
Deep Heat Mining Basel was a Swiss enhanced geothermal project beneath Basel, abandoned in 2009 after induced earthquakes, including a magnitude 3.4 event in December 2006.
Deepsea Bergen
Deepsea Bergen is a semi-submersible drilling rig operated by Odfjell Drilling on the Norwegian continental shelf, delivered in 2019 and renamed from Deepsea Bollsta in 2026.
Deepsea Stavanger
Deepsea Stavanger is a sixth-generation semi-submersible drilling rig owned and operated by Odfjell Drilling, delivered in 2010 by DSME in South Korea for deepwater, harsh-environment drilling.
Deepwater Horizon
Deepwater Horizon was an offshore drilling rig that exploded on April 20, 2010, in the Gulf of Mexico, killing 11 workers and spilling millions of barrels of oil.
Deer Park Energy Center
The Deer Park Energy Center is a natural gas-fired combined-cycle cogeneration plant in Deer Park, Texas, owned by Calpine, supplying electricity and steam since 2003.
Defect tolerance
Defect tolerance is a concept in semiconductor physics describing materials that stay efficient despite high defect densities, best known in lead-halide perovskites, which made low-cost solution-processed solar cells possible.
DeGolyer & MacNaughton
DeGolyer & MacNaughton is an independent petroleum consulting firm founded in Dallas, Texas, in 1936 by Everette Lee DeGolyer and Lewis MacNaughton to estimate oil and gas reserves.
Dehloran Oil Field
The Dehloran Oil Field is an onshore oil field in Ilam Province, northwestern Iran, near the Iraqi border, discovered in 1972 with reserves of 550 million barrels.
Deir Ali power station
The Deir Ali power station is a natural gas-fired combined cycle power plant south of Damascus, Syria, built in two phases to about 1,500 MW.
Delaware Express Pipeline
The Delaware Express Pipeline is a crude oil gathering system in the southern Delaware Basin of West Texas, connecting basin production to the Wolfcamp Connector System.
Delayed coking
Delayed coking is a semi-batch thermal cracking process that converts vacuum residue into gases, naphtha, gas oils, and petroleum coke, accounting for 88% of world coking capacity.
Delayed hydride cracking
Delayed hydride cracking is a time-dependent crack growth mechanism in zirconium alloys, in which hydrogen diffuses to a stressed crack tip, precipitates as brittle hydride, and fractures in repeated steps.
Delek Logistics Partners
Delek Logistics Partners is an American midstream energy master limited partnership formed in 2012, operating crude oil, natural gas, and water pipelines primarily around the Permian Basin.