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Dingji Coal Mine
Dingji Coal Mine (丁集煤矿) is an underground coal mine in Fengtai County, Huainan, Anhui, China, begun in 2004 and producing up to 6 million tonnes of coal per year.
Dingzhou power station
Dingzhou power station (定州电厂), also known as the Guohua Dingzhou power plant, is a coal-fired power station in Kaiyuan Town, Dingzhou, Hebei, China, with four units totaling 2,520 MW.
Dinorwig Power Station
Dinorwig Power Station, also known as Electric Mountain, is a pumped-storage hydroelectric plant hidden inside Elidir Fawr mountain near Llanberis, Wales, opened in 1984 and capable of reaching full power, 1,800 MW, in under a minute.
Dion-Jacobson phase
The Dion-Jacobson phase is a family of layered perovskite compounds, with formulas like A′An−1BnO3n+1, where single interlayer cations bond both adjacent inorganic slabs, unlike the Ruddlesden-Popper phase.
Dipka Coal Mine
Dipka Coal Mine, also known as the Dipka Opencast Project, is a large opencast coal mine in Korba district, Chhattisgarh, India, operated by South Eastern Coalfields Limited.
Direct ammonia fuel cell
A direct ammonia fuel cell (DAFC) is a fuel cell that feeds ammonia directly as fuel, converting its chemical energy to electricity without upstream hydrogen production.
Direct assessment (pipeline integrity)
Direct assessment (DA) is a pipeline integrity method that combines operating history, indirect survey data, and targeted excavation to examine exposed pipe directly for corrosion defects.
Direct cathode upcycling
Direct cathode upcycling is a battery-recycling approach that repairs and upgrades a spent lithium-ion cathode's chemistry while keeping its crystal structure, converting low-nickel into nickel-rich material.
Direct energy conversion of field-reversed configuration exhaust
Direct energy conversion of field-reversed configuration exhaust turns the energy of an expanding FRC fusion plasma directly into electricity by electromagnetic induction, without a steam cycle.
Direct formic acid fuel cell
A direct formic acid fuel cell is a fuel cell that converts liquid formic acid directly into electricity, studied since the early 2000s for portable power.
Direct liquefaction of biomass
Direct liquefaction of biomass is the family of thermochemical processes that turn biomass directly into biocrude, mainly by fast pyrolysis and hydrothermal liquefaction, then upgrade it to fuels.
Direct lithium extraction
Direct lithium extraction (DLE) is a family of chemical processes that extracts lithium from brines without solar evaporation, cutting brine-to-carbonate time from about a year to around a day.
Direct normal irradiance
Direct normal irradiance (DNI), also called beam radiation, is the rate at which direct sunlight reaches a surface perpendicular to the Sun's beam, measured in watts per square meter.
Direct recycling
Direct recycling is a lithium-ion battery recycling method that recovers and regenerates cathode material intact, preserving its crystal structure and avoiding energy-intensive metal extraction and resynthesis.
Direct steam generation
Direct steam generation (DSG) is a concentrating solar power technology that produces steam directly in collector receiver tubes, removing the oil loop and heat exchangers for higher efficiency and simpler plants.
Direct-drive wind turbine
A direct-drive wind turbine is a wind turbine whose generator is coupled directly to the rotor hub without a gearbox, improving reliability but requiring a larger, low-speed generator.
Direct-methanol fuel cell
A direct-methanol fuel cell (DMFC) is a fuel cell that converts liquid methanol directly into electricity, pursued for portable and remote power despite methanol crossover limiting its performance.
Direct-use geothermal
Direct-use geothermal is the use of geothermal energy for heating without first converting it to electricity, through wells tapping 80–300 °F waters for buildings and industry.
Directional overcurrent relay
A directional overcurrent relay, ANSI device 67, combines overcurrent and directional elements so it trips only for fault current above pickup flowing in a preset direction.
Disordered rock salt
Disordered rock salt (DRX) is a class of lithium-ion battery cathode materials in which lithium and transition-metal cations randomly share one lattice, promising high cobalt-free capacity since the mid-2010s.
Distance relay
A distance relay is a protective relay, designated ANSI device 21, that measures voltage-to-current ratio to detect and locate faults within a set electrical distance of a power line.
Distillers corn oil
Distillers corn oil (DCO) is corn oil recovered after fermentation in dry-mill ethanol plants, unfit for food use without refining and used for livestock feed and biodiesel.
Distributed generation
Distributed generation, also known as distributed or decentralized energy, is the production of electricity at or near the point of use, including rooftop solar and small wind.
Distribution automation
Distribution automation is the use of sensors, communications, and automated switching on the electric distribution grid to detect, isolate, and restore faults, reducing outage duration and extent.
Distribution board
A distribution board, also known as a breaker panel or fuse box, is an enclosure dividing an electrical supply into separate circuits protected by fuses or circuit-breakers.
Distribution company (India)
A distribution company in India, commonly called a DISCOM, is a licensed utility that purchases power and sells it to end consumers through the distribution network.
Distribution system state estimation
Distribution system state estimation (DSSE) is a power systems method that infers voltage magnitudes and angles across a distribution feeder from limited real-time and pseudo-measurements.
Distribution transformer
A distribution transformer, also called a pole pig or service transformer, makes the final step in voltage reduction, converting medium grid voltage to the low voltage used by homes and businesses.
District heating
District heating, also called teleheating or a heat network, supplies hot water or steam to buildings through insulated pipes, often more efficiently than individual heating.
Disused sealed radioactive source
A disused sealed radioactive source is a sealed radioactive source no longer used and not intended to be used again, often from medicine, industry, or research.