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Occupancy sensor
An occupancy sensor detects people in a space and automatically controls lighting or HVAC, most often via passive infrared or ultrasonic technology, saving 10% to 90% of lighting energy.
Ocean Power Technologies
Ocean Power Technologies is an American maritime technology company founded in New Jersey in 1984, building wave-energy buoys, autonomous surface vessels, and command-and-control software for defense and ocean research.
Ocean Renewable Power Company
Ocean Renewable Power Company is a Maine company, founded in 2004, whose tidal turbines in Cobscook Bay delivered grid power in 2012, described as a North American first.
Ocean thermal energy conversion
Ocean thermal energy conversion (OTEC) is a renewable energy technology that generates electricity from the temperature difference between warm surface and cold deep ocean water.
Ocean Winds
Ocean Winds is an international offshore wind company created in 2019 as a 50-50 joint venture between EDP Renewables and ENGIE, headquartered in Madrid and active worldwide.
Ocelote Oil and Gas Field
The Ocelote Oil and Gas Field (Campo Ocelote) is an oil field in the Llanos Orientales basin of Colombia, operated by Hocol since its discovery in 2007.
Ocensa Oil Pipeline
The Ocensa Oil Pipeline (Oleoducto Central) is Colombia's largest crude oil pipeline, an 836-kilometer line from the Cusiana and Cupiagua fields in Casanare to Coveñas on the Caribbean coast.
Och Oil and Gas Field
Och Oil and Gas Field is a light crude oil field in Mexican Gulf of Mexico waters, discovered in 1985, operated by Pemex, and developed with the Uech and Kax fields.
Ochigufu Oil Field
Ochigufu Oil Field is a deepwater oil field about 150 km offshore Angola, discovered by Eni in 2014 and producing 24,000 barrels per day since 2018.
Oconee Nuclear Station
Oconee Nuclear Station is a three-unit nuclear power plant on Lake Keowee near Seneca, South Carolina, operated by Duke Energy; its units began operation in 1973 and 1974.
Octane rating
The octane rating, or octane number, is a number measuring a spark-ignition fuel's resistance to knocking, defined on a scale where iso-octane is 100 and n-heptane is 0.
Octli Oil and Gas Field
The Octli Oil and Gas Field is an offshore oil and gas field in shallow water off Mexico, discovered in 2017 and operated by Petróleos Mexicanos.
October Oil and Gas Field
The October Oil and Gas Field is an offshore oil field in the north-central Gulf of Suez, Egypt, discovered in 1977 and once Egypt's largest oil producer.
Oda Oil and Gas Field
Oda is an oil field in the southern Norwegian North Sea, discovered in 2011 and producing since 2019 through a subsea tieback to the Ula field.
Odfjell Drilling
Odfjell Drilling is a Norwegian offshore drilling contractor founded in 1973 by the Odfjell family of Bergen, operating harsh-environment semi-submersible rigs in the North Sea.
Odisha Power Generation Corporation
Odisha Power Generation Corporation (OPGC) is a wholly state-owned power company of Odisha, India, incorporated in 1984 and operating the 1,740 MW Ib Thermal Power Station.
Odoptu field
Odoptu (Одопту) is an oil and gas field on the northeastern shelf of Sakhalin Island, Russia, and one of three fields in the Sakhalin-1 project, producing since 2010.
Odorization
Odorization is the deliberate addition of a strong-smelling odorant to odorless natural gas so leaks are detectable by smell, made standard after the 1937 New London school explosion.
Odudu Oil and Gas Field
Odudu is an operating oil and gas field in shallow water offshore Nigeria, in block OML 100 in the southeastern Niger Delta, operated by TotalEnergies.
Oeste de Atapu Oil and Gas Field
Oeste de Atapu is an offshore oil and gas field in the pre-salt section of Brazil's Santos Basin, about 200 km off Rio de Janeiro and operated by Petrobras.
Ofelia (oil field)
Ofelia is an oil and gas discovery in block 35/6 in the northern North Sea, proven in 2022 and developed as a subsea tie-back to the Gjøa field.
Off-the-grid
Off-the-grid describes a building or community operating without public utility networks, most commonly the electrical grid, typically in remote areas where extending power lines costs more than generating and storing power onsite.
Office of Civilian Radioactive Waste Management
The Office of Civilian Radioactive Waste Management (OCRWM) was a Department of Energy office created by the Nuclear Waste Policy Act of 1982 to dispose of spent nuclear fuel.
Office of Energy Infrastructure Safety
The Office of Energy Infrastructure Safety, or Energy Safety, is a California department under the Natural Resources Agency that approves electrical corporations' wildfire mitigation plans.
Offshore drilling
Offshore drilling, also called offshore petroleum drilling, is the extraction of oil and gas from wells beneath the seabed, first done in 1897 off Summerland, California.
Offshore Wind Energy Act (Germany)
The Offshore Wind Energy Act (German: Windenergie-auf-See-Gesetz, WindSeeG) is the German federal law governing the planning, auction, and construction of offshore wind farms, in force since 2017.
Offshore wind power
Offshore wind power is the generation of electricity from wind turbines installed at sea, mostly on fixed seafloor foundations, with 92.5 GW installed globally by 2025.
Ofgem
Ofgem, the Office of Gas and Electricity Markets, is the independent regulator of Great Britain's gas and electricity markets, established in 2000 to protect consumers and set the energy price cap.
Ogbele gas field
The Ogbele gas field is an onshore oil and gas field in Rivers State in the Niger Delta, Nigeria, operated by Aradel Holdings and producing since 2005.
OGE Energy
OGE Energy Corp. is an Oklahoma City energy holding company formed in 1997 around Oklahoma Gas and Electric, a regulated utility serving about 913,000 customers across Oklahoma and western Arkansas.