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O
- O2 Power
- Oakey Power
- Occidental Petroleum
- Ocean Breeze Energy
- Ocean Winds
- OCP Group
- Octopus Energy
- Octopus Investments
- Odfjell Oceanwind
- Offshore
- Offshore wind
- Offshore Wind Limited
- Offshore Wind Power
- Oil
- Oil
- Oil & Natural Gas Corporation (ONGC)
- Oil and Gas Development Company Limited (OGDCL)
- Oil and Natural Gas Corporation (ONGC)
- OKEA
- Omaha Public Power District (OPPD)
- Omaha Public Power District (OPPD)
- Oman
- Oman Electricity Transmission Company (OETC)
- Oman LNG
- Oman Oil
- OMV Group
- OMV Petrom
- One Gas Resources
- One Planet Associates (OPA)
- ONE-Dyas
- Onix Group
- OnPath Energy
- Onshore wind
- Ontras Gastransport
- Opdenergy
- Operational
- OQ
- Oracle Energy
- OranjeWind
- ORE Catapult
- Origin Energy
- Orion OWF
- Orkney Sustainable Energy
- Orlen Group
- ORLEN Upstream Norway (formerly PGNiG Upstream Norway)
- Ormat Technologies
- Ormsary and Stronachullin Estates (Allt Dearg Wind Farmers LLP)
- Orton Park Wind Energy
- Ossian OWF
- Otter Power
- Overland
- OX2
- OZ Minerals