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- Gabon Oil CompanyThe Gabon Oil Company is the national oil and gas company of the African nation of Gabon.
- GAILCentral Public Sector Undertaking
- Galafi–Nagad High Voltage Power LineHigh voltage power line in East Africa
- Galkynyş Gas FieldLarge natural gas field near Ýolöten in Mary Province of Turkmenistan
- Garnaut Climate Change ReviewProfessor Ross Garnaut led two climate change reviews, the first commencing in 2007 and th
- Garob Wind Power StationWind farm in South Africa
- Gas carrierShip designed to transport liquefied chemical gases in bulk
- Gas Council1949–1972 UK government body
- Gas cylinderCylindrical container for storing pressurised gas
- Gas engineInternal combustion engine powered by gaseous fuel
- Gas Exporting Countries ForumIntergovernmental organization
- Gas lightingTypes of lighting device which burn gas fuel
- Gas mantleDevice for generating bright light when heated by a flame
- Gas stoveType of cooking stove
- Gas to liquidsConversion of natural gas to liquid petroleum products
- Gas-cooled reactorType of nuclear reactor, CO2 or He cooled
- Gas-discharge lampArtificial light sources powered by ionized gas electric discharge
- Gas-fired power plantType of power station
- Gas–oil separation plantIn the upstream oil industry, a gas–oil separation plant (GOSP) is temporary or permanent
- GasificationForm of energy conversion
- GasunieN.V. Nederlandse Gasunie (short form: Gasunie) is a Dutch natural gas infrastructure and t
- Gateway Generating StationGateway Generating Station (GGS), formerly Contra Costa Unit 8 Power Project, is a combine
- GE BWRType of commercial fission reactor
- GE WindAmerican wind turbine manufacturer
- Gedser wind turbineThe Gedser wind turbine is located near Gedser in the south of the Danish island of Falste
- General Motors EN-VElectric autonomous vehicle with cabin on two wheels
- Generation II reactorA generation II reactor is a design classification for a nuclear reactor, and refers to th
- Generation III reactorClass of nuclear reactors with improved safety over its predecessors
- Generation IV reactorNew nuclear reactor technologies under development
- George GalatisAmerican nuclear engineer and whistleblower
- George WeilGeorge Leon Weil (September 18, 1907 – July 1, 1995) was an American physicist. On Decembe
- Geothermal energyThermal energy generated and stored in the Earth
- Geothermal energy in the United StatesOverview of geothermal power in the United States of America
- Geothermal energy in UkraineGeothermal energy in Ukraine is mostly heat, but electricity generation has substantial po
- Geothermal power in IcelandGeothermal power in Iceland refers to the use of geothermal energy in Iceland for electric
- Geothermal power in IndonesiaGeothermal power in Indonesia is an increasingly significant source of renewable energy. A
- Geothermal power in ItalyGeothermal power accounts for about 1.6-1.8% of the total electric energy production in It
- Geothermal power in KenyaGeothermal power is very cost-effective in the Great Rift Valley of Kenya, East Africa. As
- Geothermal power in New ZealandGeothermal power in New Zealand plays a significant part of the energy generation capacity
- Geothermal power in the United KingdomThe United Kingdom generates a small amount of geothermal power and uses a little geotherm
- German National Action Plan on Energy EfficiencyThe German National Action Plan on Energy Efficiency (NAPE) (German: Nationaler Aktionspla
- German Renewable Energy Sources ActSeries of German laws
- Getty familyAmerican business and entertainment family
- Ghawar FieldOil field in Saudi Arabia
- Ghazi-Barotha Hydropower ProjectDam near Attock in Pakistan
- Giant oil and gas fieldsFields with over 500 million barrels of recoverable oil or gas equivalent
- Gisagara DistrictGisagara is a district (akarere) in Southern Province, Rwanda. Its headquarters is Ndora.
- Gisagara Thermal Power StationPower station in Southern, Rwanda
- Glass in green buildingsMaterial usage in sustainable architecture
- Glen Davis Shale Oil WorksOil extraction plant
- Global strategic petroleum reservesCrude oil inventories held for national security during an energy crisis
- GlobalSantaFe CorporationFormer offshore drilling contractor headquartered in Houston, Texas
- Golar SpiritLiquefied natural gas storage ship
- GoldwindChinese state-owned wind turbine manufacturer
- Golfech Nuclear Power PlantThe Golfech Nuclear Power Plant is located in the commune of Golfech (Tarn-et-Garonne), on
- GorlebenGorleben is a small municipality (Gemeinde) in the Gartow region of the Lüchow-Dannenberg
- Gösgen Nuclear Power PlantThe Gösgen Nuclear Power Plant (in German Kernkraftwerk Gösgen, abbreviated as KKG) is loc
- Government of BruneiThe Government of Brunei is the union government created by the constitution of Brunei whe
- Grand Inga DamProposed hydro power generation complex in the Democratic Republic of the Congo
- Graphite-moderated reactorType of nuclear reactor
- Graptolitic argilliteGraptolitic argillite (also known as dictyonema argillite, dictyonema oil shale, dictyonem
- Gravelines Nuclear Power StationNuclear power plant in France
- Gravity damType of dam using its weight to hold back water
- GreasestockGreasestock was an American event held yearly in Yorktown Heights, New York. Exhibitors sh
- Green buildingEnvironmentally responsible construction principles
- Green building and woodGreen building is a technique that aims to create structures that are environmentally resp
- Green Building InitiativeThe Green Building Initiative (GBI) is a 501(c)(3) nonprofit organization that owns and ad
- Green Giant Solar Power StationSolar farm in the Democratic Republic of Congo
- Green Puerto RicoSeries of green reforms
- Greenhouse Solutions with Sustainable Energy2007 book by Mark Diesendorf
- Gregory MinorGregory Charles Minor (died 1999) was one of three American middle-management engineers (k
- Gribo–Popoli Hydroelectric Power StationPower station in Ivory Coast
- Grid balancingGrid balancing ensures that electricity consumption matches electricity production of an e
- Grid codeSpecifications for electrical grids
- Grid energy storageLarge scale electricity supply management
- Grid-tie inverterElectrical equipment
- Ground source heat pumpSystem to transfer heat to/from the ground
- Gryazovets–Vyborg gas pipelineBranch pipeline of the Northern Lights pipeline
- GuaratibaGuaratiba is a large neighborhood in the West Zone of Rio de Janeiro, Brazil, on the east
- Guaratiba GroupGeological group of the Santos Basin near Brazil
- Guernsey ElectricityGuernsey Electricity Limited (GE) is the sole commercial electricity supplier on the islan
- Gull River FormationThe Gull River Formation is a geological formation of Middle Ordovician age (Caradoc Stage
- Gunashli oilfieldGunashli (Azerbaijani: Günəşli) is an offshore oil field in the Caspian Sea, located 120 k
- Gundersen Health SystemGundersen Health System (Gundersen Health) is a comprehensive non-profit health system bas
- GunpowderType of firearm propellant