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- Oak Creek Power PlantElectrical power station in Oak Creek, Milwaukee County, Wisconsin
- Ocean power in New ZealandNew Zealand has large ocean energy resources but does not yet generate any power from them
- Ocean thermal energy conversionExtracting energy from the ocean
- Odesa–Brody pipelineCrude oil pipeline in Ukraine
- Off-the-gridNot being connected to public utilities
- Office for Nuclear RegulationUK Regulator for the nuclear industry
- Offshore oil and gas in CaliforniaOffshore oil and gas in California provides a significant portion of the state's petroleum
- Offshore oil and gas in the United StatesLarge portion of oil and gas supply
- Offshore wind powerWind turbines in marine locations for electricity production
- Offshore wind power in the United StatesOffshore wind power in the United States is in the early stages of development and shiftin
- OfgemUnited Kingdom government non-ministerial department
- OgiesOgies is a settlement in Nkangala District Municipality in the Mpumalanga province of Sout
- Ōhakuri DamThe Ōhakuri Dam is a dam and hydroelectric power station on the Waikato River, central Nor
- Oil and gas agreementThe oil and gas industry operates in countries throughout the world in accordance with a n
- Oil and gas industry in IndiaThe petroleum industry in India dates back to 1889 when the first oil deposits in the coun
- Oil and gas industry in the United KingdomThe oil and gas industry plays a central role in the economy of the United Kingdom. Oil an
- Oil and Natural Gas CorporationIndian crude oil and natural gas producer
- Oil burner (engine)Steam engine that uses oil as fuel
- Oil depletionDecline in oil production
- Oil in placeTotal oil content of an oil reservoir
- Oil lampLamp used for lighting by burning oil
- Oil megaprojectsLarge oil field projects
- Oil megaprojects (2013)This page summarizes projects that propose to bring more than 20,000 barrels per day (3,20
- Oil platformOffshore ocean structure with oil drilling and related facilities
- Oil production plantFacility which processes production fluids from oil wells
- Oil reserves in CanadaOil reserves in Canada were estimated at 172 billion barrels (27×109 m3) as of the start o
- Oil reserves in IranProven oil reserves in Iran, according to its government, rank fourth largest in the world
- Oil reserves in IraqOil reserves located in Iraq
- Oil reserves in LibyaOil reserves located in Libya
- Oil reserves in MexicoAs of 2007, the proven oil reserves in Mexico were 12.4 billion barrels (1.97×109 m3). The
- Oil reserves in RussiaOil reserves located in Russia
- Oil reserves in Saudi ArabiaOil reserves located in Saudi Arabia
- Oil reserves in the United StatesOil reserves located in the United States
- Oil reserves in VenezuelaOil reserves located in Venezuela
- Oil shale economicsEconomic feasibility of oil shale extraction and processing
- Oil shale in ChinaOverview of the industry in China
- Oil shale in EstoniaOverview of the industry in Estonia
- Oil shale in JordanOverview of the industry in Jordan
- Oil shale in MoroccoOverview of the industry in Morocco
- Oil shale industryResource extraction industry
- Oil terminalIndustrial facility for the storage of oil, petroleum and petrochemical products
- Oil-for-Food ProgrammeProgramme headed by the United Nations
- Okawachi Pumped Storage Power StationDam in Kanzaki district, Hyōgo
- OkloRegion containing uranium ore in Haut-Ogooué, Gabon
- Old Head of KinsaleThe Old Head of Kinsale (Irish: An Seancheann) is a headland near Kinsale, County Cork, Ir
- Olkaria III Geothermal Power StationGeothermal power station in Kenya
- Olkaria–Lessos–Kisumu High Voltage Power LineKenyan high voltage power transmission line
- Olkiluoto Nuclear Power PlantNuclear power plant in Eurajoki, Finland
- Olmedilla Photovoltaic ParkThe Olmedilla Photovoltaic Park is a 60-megawatt (MW) photovoltaic power plant, located in
- OlwiyoOlwiyo is a town in Nwoya District in the Northern Region of Uganda.
- Onkalo spent nuclear fuel repositoryDeep geological repository for radioactive waste in Finland
- Ontario Sustainable Energy AssociationThe Ontario Sustainable Energy Association (OSEA) is a non-profit organization supporting
- Open Smart Grid ProtocolThe Open Smart Grid Protocol (OSGP) is a family of specifications published by the Europea
- Operation Opera1981 Israeli airstrike on an Iraqi nuclear reactor
- OPR-1000The OPR-1000 is a South Korean-designed two-loop 1000 MWe PWR Generation II nuclear reacto
- Opuyo–Moroto High Voltage Power LineThe Opuyo–Moroto High Voltage Power Line is a high voltage electricity power line, connect
- Organization of Arab Petroleum Exporting CountriesKuwait-based energy policy coordinating organization
- Orinoco BeltTerritory and oilfield in Venezuela
- OrlenPolish oil refiner and petrol retailer
- Ormen Lange (gas field)Large fossil fuel deposit off the coast of Norway
- Orphan wellsDisused oil or gas wells
- Osmotic powerSustainable energy from sea and river water
- Overhead cableCable used for transmission of information on utility poles
- Overhead power lineAbove-ground structure for bulk transfer and distribution of electricity
- Oxford Institute for Energy StudiesThe Oxford Institute for Energy Studies, founded in 1982, is an independent energy researc
- Oya Hybrid Power StationHybrid power station in South Africa
- Oyster Bay Wind Power StationWind farm in South Africa
- Oyster wave energy converterHydro-electric generator using wave energy