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- L5 SocietyThe L5 Society was founded in 1975 by Carolyn Meinel and Keith Henson to promote the space
- La Crosse, WisconsinCity and county seat of La Crosse County, Wisconsin
- Lake NziloLake Nzilo (formerly Lake Delcommune, also Lac del Commune) is a reservoir formed by a hyd
- Lamu Coal Power StationProposed coal-fired power station in Kenya
- Landfill gasGaseous fossil fuel
- Langeled pipelineGas pipeline from Norway to the UK
- LanternPortable lighting device
- Lapa oil fieldBrazilian offshore oil field
- LarderelloLarderello is a frazione of the comune of Pomarance, in Tuscany in central Italy, renowned
- Large Combustion Plant DirectiveThe Large Combustion Plant Directive (LCPD, 2001/80/EC) is a European Union directive whic
- Lawrence Berkeley National LaboratoryLaboratory Berkeley, California, and Oakland, California, US
- Lawrence Livermore National LaboratoryFederal research center in California, US
- Lawson criterionCriterion for igniting a nuclear fusion chain reaction
- Le Pouget (power station)Dam in Le Truel
- Lead–acid batteryRechargeable battery type often used in motor vehicles
- LED lampElectric light that produces light using LEDs
- LEEDStandard for green building design
- Lekela PowerIndependent power producer based in the Netherlands
- Lesterville, MissouriLesterville is an unincorporated community in southeast Missouri, United States. It is loc
- Letlhakane Concentrated Solar Power StationPower station in Botswana
- Levelized cost of electricityMeasure of lifetime average net present cost of electricity generation
- Levis De-IcerThe Levis De-Icer is a High voltage direct current (HVDC) system, aimed at de-icing multip
- Lexington LimestoneThe Lexington Limestone is a prominent geologic formation that constitutes a large part of
- LF EnergyElectricity sector technology
- Libra oil fieldOil field in Santos Basin, Brazil
- Light fixtureElectrical device with an electric lamp
- Light tubeArchitectural structures that transmit or distribute light
- LighterHandheld device used to generate a flame
- Lightning rodMetal rod intended to protect a structure from a lightning strike
- Lignite Energy CouncilAmerican trade association
- Lignocellulosic biomassPlant dry matter
- Limerick Generating StationNuclear power plant in Montgomery County, Pennsylvania, US
- Liquefied natural gasForm of natural gas for easier storage and transport
- Liquefied natural gas terminalFacility for processing shipments of the fossil fuel
- Liquefied petroleum gasFuel for heating, cooking and vehicles
- Liquid fuelLiquids that can be used to create energy
- Lira DistrictLira District is a district in Northern Uganda. Like many other Ugandan districts, it is n
- Lira–Gulu–Nebbi–Arua High Voltage Power LinePower line in Uganda
- Lithium ion manganese oxide batteryType of lithium-ion cell
- Lithium iron phosphateCathode material for lithium batteries
- Lithium polymer batteryLithium-ion battery using a polymer electrolyte
- Lithium-ion batteryType of rechargeable battery
- Lithium-titanate batteryFast rechargeable lithium ion battery
- Live steamLive steam is steam under pressure, obtained by heating water in a boiler. The steam may b
- Livingstone FallsLivingstone Falls (French: Chutes Livingstone; Dutch: Livingstonewatervallen), named for B
- LNG carrierAn LNG carrier is a tank ship designed for transporting liquefied natural gas (LNG).
- Load factor (electrical)Average power divided by peak power
- Load managementProcess of balancing the supply of electricity on a network
- Load profileIn electrical engineering, a load profile is a graph of the variation in the electrical lo
- Load-following power plantPower plant that adjusts output based on demand
- Lobito Oil RefineryOil refinery in Angola
- Loch Sloy Hydro-Electric SchemeHydroelectric power station in Scotland
- Loiyangalani–Suswa High Voltage Power LineHigh-voltage transmission line in Kenya
- London ArrayWind farm located on the Thames Estuary, UK
- London Hydraulic Power CompanyFormer UK business 1883–1977
- Longtan DamDam in Tian'e County, Guangxi, China
- Los Vientos Wind FarmLos Vientos Wind Farm is a 912 megawatt (MW) wind farm in Starr and Willacy counties in So
- Loss-of-coolant accidentForm of nuclear reactor failure
- Low-carbon electricityPower produced with lower carbon dioxide emissions
- LubminLubmin (German pronunciation: ) is a coastal resort in the German state of Mecklenburg-Vor
- Ludington Pumped Storage Power PlantThe Ludington Pumped Storage Plant is a hydroelectric plant and reservoir in Ludington, Mi
- Luminous efficacyHow efficiently a source produces visible light
- Lunsemfwa Hydro Power CompanyZambian independent power producer
- LuweeroLuweero is a town in the Central Region of Uganda. It is the main municipal, administrativ