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Okarem-Beyneu Gas Pipeline
The Okarem-Beyneu Gas Pipeline (Russian: Газопровод Окарем-Бейнеу) is a natural gas pipeline from Okarem, Turkmenistan, to Beyneu, Kazakhstan, built in the 1970s to carry Soviet gas westward.
Okeechobee Clean energy center
The Okeechobee Clean Energy Center (OCEC) is a 1,723 MW natural gas-fired combined-cycle power plant in Okeechobee County, Florida, operated by Florida Power & Light since 2019.
Okinawa Electric Power Company
The Okinawa Electric Power Company, Incorporated (沖縄電力, OEPC) is the vertically integrated electric utility serving Japan's Okinawa Prefecture, founded in 1972 and privatized in 1988. Its isolated grid runs mainly on coal, LNG, and oil.
Oklo Inc.
Oklo Inc. is an American advanced nuclear technology company, founded in 2013, developing the Aurora fast reactor, a 15 to 75 MWe powerhouse, and nuclear fuel recycling.
Okpai Oil and Gas Field
The Okpai Oil and Gas Field is an onshore oil and gas field in Nigeria's Niger Delta, best known for hosting Nigeria's first oil-company-built independent power plant.
Okutataragi hydroelectric plant
The Okutataragi hydroelectric plant, also called Okutataragi Pumped Storage Power Station (奥多々良木発電所), is a 1,932 MW pumped-storage plant in Asago, Hyogo Prefecture, Japan, and Japan's largest hydropower station.
Olaroz Lithium Facility
The Olaroz Lithium Facility is a lithium brine operation on the Salar de Olaroz in Jujuy Province, Argentina, producing battery-grade lithium carbonate since 2014 at about 3,900 meters elevation.
Old Dominion Electric Cooperative
Old Dominion Electric Cooperative (ODEC) is a not-for-profit wholesale generation and transmission cooperative incorporated in Virginia in 1948, serving 11 member distribution cooperatives that supply about 1.5 million people across Virginia, Maryland, and Delaware.
Old Harbour FSRU
The Old Harbour FSRU is a floating storage and regasification unit off Old Harbour Bay, Jamaica, the Caribbean's first, supplying the Old Harbour and Jamalco power plants since 2019.
Oldelval Oil Pipeline
Oldelval (Oleoductos del Valle S.A.) is an Argentine pipeline company operating the country's largest oil pipeline system, carrying Neuquén Basin crude, including Vaca Muerta shale oil, to the Atlantic port of Puerto Rosales.
Olive Downs Coal Mine
The Olive Downs Coal Mine is an open-cut coking coal mine in Queensland's Bowen Basin, about 40 km from Moranbah, owned by Pembroke Resources and mining since 2023.
Olive mill waste
Olive mill waste is the solid and liquid residue generated when olives are processed into olive oil, produced at large scale across the Mediterranean basin.
Oliver Dowling Kingsley Jr.
Oliver Dowling Kingsley Jr. is an American nuclear power executive and engineer, elected to the National Academy of Engineering in 2003, known for turning around the TVA and ComEd nuclear fleets.
Olkaria Geothermal Power Station
The Olkaria Geothermal Power Station is a complex of geothermal plants in Hell's Gate National Park, Kenya, about 120 km from Nairobi, the largest in Africa.
Olkiluoto Nuclear Power Plant
Olkiluoto Nuclear Power Plant (Olkiluoto NPP) is a three-unit nuclear power station on Olkiluoto island in Eurajoki, Finland, operated by Teollisuuden Voima, supplying about 28 percent of Finnish electricity in 2024.
Olombendo Oil and Gas Field
The Olombendo oil and gas field is the East Hub development of Angola's Block 15/06, producing oil through the FPSO Armada Olombendo since February 2017.
Olympus Energy
Olympus Energy, formerly Huntley & Huntley Energy Exploration, was a privately held natural gas producer in Canonsburg, Pennsylvania, whose Marcellus and Utica assets were acquired by EQT in 2025.
Omaezaki power station
The Omaezaki power station, formally the Omaezakikou Biomass Power Plant, is a 75.0 MW biomass plant at the Port of Omaezaki in Shizuoka Prefecture, Japan, operating since 2025.
Omaha Public Power District
Omaha Public Power District is a not-for-profit, customer-owned public electric utility and political subdivision of Nebraska serving Omaha and 13 counties, created by the legislature in 1946.
Oman Electricity Transmission Company
Oman Electricity Transmission Company (OETC) is the owner and operator of Oman's main electricity transmission network and its system operator, formed in May 2005 under Royal Decree 78/2004.
Oman Main Oil Line
The Oman Main Oil Line (MOL) is the crude oil pipeline network of Oman, carrying oil from Petroleum Development Oman's fields to the Mina al Fahal export terminal.
Oman Qalhat LNG Terminal
The Oman Qalhat LNG Terminal is a liquefied natural gas export terminal at Qalhat, near Sur in Oman, with a capacity of 11.4 million tonnes a year.
Ombilin Coal Mining Heritage of Sawahlunto
Ombilin Coal Mining Heritage of Sawahlunto, a UNESCO World Heritage Site since 2019, is a serial Dutch colonial industrial ensemble in West Sumatra: mines, company town, 155 km rack railway, and Emmahaven port, worked partly by convict orang rantai labour.
Ombinskoye Oil Field
Ombinskoye Oil Field (Омбинское месторождение) is an onshore oil field near Nefteyugansk in western Siberia, Russia, discovered in 1978, developed by Rosneft's RN-Yuganskneftegaz, with reserves of about 247 million barrels.
OMEGA laser
The OMEGA laser is a 60-beam inertial confinement fusion research laser at the University of Rochester's Laboratory for Laser Energetics, first fired in 1995, that implodes fusion fuel capsules by direct drive.
OMEGA laser facility
The OMEGA laser facility is an inertial confinement fusion research complex at the University of Rochester in Rochester, New York, built around the OMEGA-60 and OMEGA EP laser systems.
Omexom
Omexom is the energy infrastructure brand of VINCI Energies, part of the French group VINCI, launched in 2000 and covering power generation, transmission, and solar.
OMICRON Electronics
OMICRON Electronics is an employer-affiliation entry covering Alexander Apostolov, a power-system protection engineer and Principal Engineer at OMICRON electronics in Los Angeles since September 2006.
OMIE
OMIE (Operador del Mercado Ibérico de Energía) is the nominated electricity market operator for Spain and Portugal, running their day-ahead and intraday wholesale markets from Madrid as the sole designated NEMO under MIBEL.
Omsk CHP-5 power station
Omsk CHP-5 (Омская ТЭЦ-5) is a coal-fired combined heat and power plant in Omsk, Russia, owned by TGC-11 under Inter RAO, with 735 MW capacity.