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Flash steam geothermal power
Flash steam geothermal power is the most widely used geothermal technology, flashing pressurized hot water above 182°C into steam to drive turbines; a double flash variant yields 15–25% more power.
Flat Glass Group
Flat Glass Group (福莱特) is a Chinese glass manufacturer founded in 1998 and headquartered in Jiaxing, Zhejiang, one of the world's largest producers of photovoltaic glass for solar modules.
Flat-plate collector
A flat-plate collector is a non-concentrating solar thermal collector in which a flat, glazed absorber plate heats a circulating fluid, used for domestic water heating and space heating.
Flender (gearbox manufacturer)
Flender GmbH is a German manufacturer of industrial gear units, couplings, and generators, founded in 1899 and headquartered in Bocholt, supplying wind turbine drivetrains under its Winergy brand.
Flexible AC transmission system
A flexible AC transmission system (FACTS) is an AC transmission system with power electronic-based static controllers that enhance controllability and increase power transfer capability, a definition given by the IEEE.
Flexible perovskite solar cell
A flexible perovskite solar cell is a thin-film photovoltaic device made on bendable substrates such as plastic, metal foil, or ultrathin glass, with single-junction efficiencies now above 23%.
Flexible perovskite solar modules
Flexible perovskite solar modules are photovoltaic modules that integrate multiple perovskite sub-cells on bendable plastic or metal foil substrates, offering high efficiency, low weight, and roll-to-roll manufacturing compatibility.
Flexible-fuel vehicle
A flexible-fuel vehicle (FFV), also called a flex-fuel vehicle, is a car or light truck that runs on gasoline or ethanol-gasoline blends up to 83% ethanol, including E85.
FLiBe
FLiBe is a molten salt of lithium fluoride and beryllium fluoride, developed at Oak Ridge in the 1940s and now a leading coolant and tritium breeder for fusion blankets.
FLISR
FLISR, or fault location, isolation, and service restoration, is a distribution automation function in which electric utilities automatically locate feeder faults, isolate the faulted section, and restore power to unfaulted sections within about a minute.
Fljótsdals hydroelectric plant
The Fljótsdals hydroelectric plant (Fljótsdalsstöð, also known as the Kárahnjúkar Hydropower Plant) is a 690 MW underground station in eastern Iceland, Iceland's largest, built mainly to supply Alcoa's aluminum smelter.
FLNG
FLNG, or floating liquefied natural gas, is a moored offshore vessel that extracts, liquefies, stores, and offloads LNG at sea, replacing a pipeline to shore and an onshore plant.
Floating production storage and offloading
A floating production storage and offloading (FPSO) vessel is a ship-shaped offshore facility that processes oil from subsea wells, stores it, and offloads it to tankers.
Floating solar
Floating solar, also called floating photovoltaics (FPV) or floatovoltaics, installs solar panels on floating structures on lakes, reservoirs, and ponds, saving land and cooling panels for higher yields.
Floating storage and regasification unit
A floating storage and regasification unit (FSRU) is a ship moored at an LNG import terminal that stores LNG, regasifies it, and sends gas to the onshore pipeline network.
Floating wind turbine
A floating wind turbine is an offshore turbine mounted on a buoyant, moored platform for waters too deep for fixed foundations, first demonstrated off Norway in 2009.
Floreña Oil and Gas Field
Floreña is an oil and gas condensate field in the Llanos foothills near Yopal, Casanare, Colombia, discovered by British Petroleum in the 1990s and operated by Ecopetrol.
Florida Gas Transmission
Florida Gas Transmission is a roughly 5,400-mile interstate natural gas pipeline from South Texas to South Florida, delivering about 60 percent of the gas consumed in Florida.
Florida Gas Transmission Pipeline
Florida Gas Transmission is an interstate natural gas pipeline running from south Texas to south Florida; in service since 1959, it is Florida's oldest and largest pipeline network.
Florida Power & Light
Florida Power & Light Company, or FPL, is a NextEra Energy subsidiary founded in 1925. The largest electric utility in the United States, it serves more than six million customer accounts.
Flotek Industries
Flotek Industries, Inc. is a Houston, Texas-based specialty chemistry and data technology company serving the energy industry, founded in 1985 and listed on the NYSE as FTK.
Flounder Oil and Gas Field
Flounder is an oil and gas field in the Gippsland Basin of Bass Strait, off Victoria, Australia, discovered in 1968 and producing oil from 1984.
Flow battery
A flow battery, also called a redox flow battery, is a rechargeable device that stores energy in liquid electrolytes pumped through cell stacks from external tanks, suited to long-duration grid storage.
Flowco Holdings
Flowco Holdings is a Houston-based oilfield services company providing artificial lift, production optimization, and emissions management for oil and gas producers; it went public on the NYSE in 2025.
Flue gas condensing heat recovery
Flue gas condensing heat recovery cools combustion exhaust below its water dew point, recovering latent heat that can raise boiler efficiency by more than 10%.
Flue-gas desulfurization
Flue-gas desulfurization, also called flue-gas desulphurisation, is a set of chemical processes that remove sulfur dioxide from coal-fired power plant exhaust gases, most commonly by wet limestone scrubbing.
Fluence Energy
Fluence Energy is an American grid-scale battery energy storage company in Arlington, Virginia, founded in 2017 as a joint venture of Siemens and AES and publicly traded since 2021.
Fluid catalytic cracking
Fluid catalytic cracking (FCC), or cat cracking, is a petroleum refining process introduced in 1942 that converts heavy gas oil into lighter products, chiefly high-octane gasoline.
Fluid coking
Fluid coking is a continuous refinery process that thermally cracks heavy petroleum residues, such as vacuum residuum, into gas, gasoline, gas oil, and coke, developed by Exxon.
Fluidized bed combustion
Fluidized bed combustion is a method of burning solid fuel particles suspended in upward-flowing air at 840–950 °C, tolerating low-grade fuels and capturing sulfur with limestone.