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Sylvera
Sylvera is a London-based carbon data and ratings company, founded in 2020 by Allister Furey and Samuel Gill, that independently assesses the quality of voluntary carbon credits.
Symbio
Symbio is a French manufacturer of hydrogen fuel cell systems for vehicles, founded in 2010 and owned equally by Michelin, Forvia, and Stellantis, with its main plant in Saint-Fons, France.
Symmetrical components
Symmetrical components decompose unbalanced three-phase voltage or current phasors into positive-, negative-, and zero-sequence sets, a method presented by C. L. Fortescue in 1918 for unbalanced fault analysis.
Symra (oil field)
Symra is an oil and gas field in the Norwegian North Sea, discovered in 2018 and producing since 2026 through a subsea tieback to the Ivar Aasen platform.
Synatom
Synatom (Société belge des combustibles nucléaires) is the Belgian company managing the nuclear fuel cycle for the country's power plants, founded in 1969 and owned by Electrabel.
Synchronized switching
Synchronized switching, also called controlled switching or point-on-wave switching, times a circuit breaker's poles to close or open at targeted phase angles, minimizing switching transients on the power grid.
Synchronous condenser
A synchronous condenser is a synchronous electrical machine with no prime mover that injects or absorbs reactive power and adds inertia to the power grid.
Synchrophasor measurement
Synchrophasor measurement is a power-system monitoring technique in which phasor measurement units estimate voltage and current magnitude and phase angle, synchronized to UTC, enabling direct comparison across substations.
Syngas
Syngas, or synthesis gas, is a gas of hydrogen and carbon monoxide made from coal, biomass, or natural gas and used to produce fuels and chemicals.
Synthesized iso-paraffins from fermented hydroprocessed sugar
Synthesized iso-paraffins from fermented hydroprocessed sugar (SIP) is a sustainable aviation fuel pathway in which engineered microbes ferment sugar into farnesene, hydrotreated to farnesane and blended into jet fuel at up to 10 percent.
Synthetic Crude Oil
Synthetic crude oil is a light, sweet crude made by upgrading oil sands bitumen, most notably in Alberta, Canada, where raw bitumen is too thick to pipeline.
Synthetic fuel
Synthetic fuel, also known as synfuel, is a liquid or gaseous fuel made without refining crude oil, by routes such as coal-to-liquids, gas-to-liquids, or e-fuels from hydrogen and captured CO2.
Synthetic graphite
Synthetic graphite, also called artificial graphite, is graphite made by heating petroleum coke and coal tar pitch to about 3000 °C, a key lithium-ion battery anode material.
Synthetic oil
Synthetic oil, also known as synthetic motor oil or synthetic lubricants, is a lubricant made by chemical synthesis rather than refined from crude oil, performing better at temperature extremes.
Synthetic-based mud
Synthetic-based mud, also called synthetic-based drilling fluid, is a drilling fluid whose continuous phase is a synthetic organic material rather than oil, developed in the early 1990s.
System 80+
System 80+ is an advanced pressurized water reactor design developed by Combustion Engineering in the United States, the first large PWR certified by the NRC, in 1997, and the ancestor of South Korea's APR1400.
System strength (electric power)
System strength is a property of an AC power system describing how well the voltage waveform resists disturbances. It is measured by available fault current, often via the short-circuit ratio.
T Plus (energy company)
T Plus, known as KES Holding until June 2015, is a Russian heat and electricity generating company built from Viktor Vekselberg's Renova assets and the country's largest centralized heat producer.
T-10 (tokamak)
T-10 is a large circular tokamak at the Kurchatov Institute in Moscow that began operation in 1975 as the largest tokamak of its time, becoming a principal testbed for electron cyclotron heating.
T-15 (tokamak)
T-15 was a superconducting tokamak with Nb3Sn coils operated from 1988 to 1995 at the Kurchatov Institute in Moscow, and was dismantled in 2017 to build the upgraded T-15MD.
T-15MD
T-15MD (Токамак Т-15МД) is a Russian divertor tokamak at the Kurchatov Institute in Moscow, a modernized successor to T-15 that reached first plasma in 2021.
T-4 (tokamak)
T-4 was a Soviet experimental tokamak operated at the Kurchatov Institute in Moscow from 1971, an upgraded successor to the landmark T-3 that hosted pioneering soft-x-ray diagnostics and early disruption physics.
T-type inverter
The T-type inverter, also called the neutral-point-piloted (NPP) inverter, is a three-level power converter topology with four switches per phase leg, widely used in utility-scale photovoltaic plants.
T. Louis Austin Jr.
T. Louis Austin Jr. was an American utility executive who led Texas Utilities Company and later served as president and CEO of Brown & Root from 1983 to 1990.
T80 lifetime
T80 lifetime is the time a solar cell takes to fall to 80% of its initial power conversion efficiency, the standard stability measure for perovskite cells.
Taas-Yuryakh Neftegazodobycha LLC
Taas-Yuryakh Neftegazodobycha LLC (ООО «Таас-Юрях Нефтегазодобыча», abbreviated ТЮНГ) is a Russian oil and gas production company, established in 2000 and based in Lensk, Yakutia, that Rosneft owns.
Tabnak Oil and Gas Field
Tabnak (تابناک) is a major onshore sweet gas field in southern Iran's Coastal Fars region, with reserves around 30 trillion cubic feet and output of about 1.5 billion cubic feet per day.
Tabriz-Ankara Gas Pipeline
The Tabriz-Ankara Gas Pipeline is a natural gas pipeline carrying Iranian gas from Tabriz, Iran, to Ankara, Turkey, supplying Turkish imports since 2001 under a 25-year contract.
Tadiran Batteries
Tadiran Batteries is an industrial battery manufacturer, founded in Israel in 1979 and owned by the French group Saft since 2000, known for lithium thionyl chloride primary cells.
TAE Technologies
TAE Technologies, formerly Tri Alpha Energy, is a private fusion company in Foothill Ranch, California, founded in 1998 by Norman Rostoker to develop reactors based on hydrogen-boron aneutronic fusion, raising nearly $1.4 billion.