# Energy companies headquartered in Oslo

Tamtam tracks 27 energy companies headquartered in Oslo. This list ranks all of them by number of employees on LinkedIn, led by Norsk Hydro, Reitan Retail and Statkraft. Their median headcount is 605. Half of them were founded in 1996 or later.

The companies listed in Oslo are predominantly involved in energy, including traditional oil and gas, and a significant cluster of renewable energy and related services. While some are large established entities, there's also a presence of more recently founded companies. Norsk Hydro specializes in sustainable industries like aluminium and renewable energy, while Statkraft is a global leader in renewable energy generation. BW Offshore engineers and operates floating production storage and offloading vessels, and Scatec ASA provides renewable energy solutions in emerging markets.

A notable pattern among these companies is their strong focus on energy generation, transmission, and associated infrastructure. There is a clear mix of long-standing companies, such as Norsk Hydro (founded 1905) and Statkraft (founded 1895), alongside newer players like Scatec ASA (founded 2007) and Norske Skog (founded 2017), indicating a blend of heritage and more recent development in the sector.

🇳🇴 Oslo · 27 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Norsk Hydro](https://www.tamtam.ai/c/norsk-hydro) (hydro.com)<br>Development of sustainable industries including aluminium production, energy, metal recycling, renewables, and batteries with global operations and innovation focus. | Mining | 🇳🇴 Oslo | 13,192 | 1905 |
| 2 | [Reitan Retail](https://www.tamtam.ai/c/reitan-retail) (reitanretail.no)<br>A leading retail company in the Nordic and Baltic region operating discount grocery, convenience stores, and sustainable mobility solutions with over 3,800 outlets | Retail | 🇳🇴 Oslo | 7,293 |  |
| 3 | [Statkraft](https://www.tamtam.ai/c/statkraft) (statkraft.com)<br>A global leader in renewable energy generation, specializing in hydropower, wind power, solar power, and gas-fired power, with operations in 21 countries | Electric Power Generation | 🇳🇴 Oslo | 4,563 | 1895 |
| 4 | [Statnett SF](https://www.tamtam.ai/c/statnett-sf)<br>The company operates the main power grid in Norway, transmitting electricity between regions and countries while developing and maintaining the network for future energy demands | Electric Power Transmission, Control, and Distribution | 🇳🇴 Oslo | 2,018 | 1991 |
| 5 | [BW Offshore](https://www.tamtam.ai/c/bw-offshore) (bwoffshore.com)<br>Engineering and operating floating production storage and offloading vessels, providing tailored offshore energy solutions for global markets. | Oil and Gas | 🇳🇴 Oslo | 1,943 |  |
| 6 | [DeepOcean](https://www.tamtam.ai/c/deepocean) (deepoceangroup.com)<br>Integrated provider of safe, high-quality subsea services and technologies for the offshore industry, focusing on survey, installation, maintenance, and project management globally | Oil and Gas | 🇳🇴 Oslo | 1,800 |  |
| 7 | [PGS](https://www.tamtam.ai/c/pgs) (tgs.com)<br>Global marine geophysics company using advanced seismic survey technology and cloud computing for energy exploration, transition, renewable energy support, and seabed mineral understanding | Oil and Gas | 🇳🇴 Oslo | 1,678 | 1991 |
| 8 | [Scatec ASA](https://www.tamtam.ai/c/scatec-asa) (scatec.com)<br>Leading renewable energy solutions provider in emerging markets, developing, building, owning, and operating clean energy plants globally with over 46 GW capacity | Renewable Energy Power Generation | 🇳🇴 Oslo | 1,412 | 2007 |
| 9 | [AF Gruppen](https://www.tamtam.ai/c/af-gruppen) (afgruppen.no)<br>A company focused on solving important societal issues, challenging the status quo, and creating new solutions for the future | Construction | 🇳🇴 Oslo | 1,288 | 1985 |
| 10 | [Seaway7](https://www.tamtam.ai/c/seaway7) (seaway7.com)<br>A global leader in delivering fixed offshore wind projects, dedicated to creating an efficient and sustainable energy supply for the future | Renewable Energy Power Generation | 🇳🇴 Oslo | 1,266 |  |
| 11 | [Hafslund](https://www.tamtam.ai/c/hafslund-oslo) (hafslund.no)<br>One of Norway's leading energy producers focusing on hydropower, system services, wholesale power trading, and innovative electrification projects for a cleaner environment | Renewable Energy Power Generation | 🇳🇴 Oslo | 957 | 1898 |
| 12 | [Norske Skog](https://www.tamtam.ai/c/norske-skog) (norskeskog.com)<br>Production of bio-products and packaging materials, operating profitable mills, focusing on bio energy, composites, chemicals, and publication paper. | Paper and Forest Product Manufacturing | 🇳🇴 Oslo | 835 | 2017 |
| 13 | [DNO ASA](https://www.tamtam.ai/c/dno-asa) (dno.no)<br>Norwegian oil and gas operator with operations in the Middle East, North Sea, and West Africa, holding stakes in various licenses worldwide | Oil and Gas | 🇳🇴 Oslo | 774 | 1971 |
| 14 | [Mer](https://www.tamtam.ai/c/mer) (mer.eco)<br>European company specializing in EV charging infrastructure, leveraging renewable energy expertise to support sustainable electric mobility across multiple countries. | Services for Renewable Energy | 🇳🇴 Oslo | 605 |  |
| 15 | [BW LNG](https://www.tamtam.ai/c/bw-lng) (bw-group.com)<br>Global leader in floating gas infrastructure solutions, developing, owning, and operating LNG carriers and floating storage and regasification units for sustainable growth | Maritime Transportation | 🇳🇴 Oslo | 482 |  |
| 16 | [Oilgas](https://www.tamtam.ai/c/oilgas) (oilgas.no)<br>A Canadian company specializing in drilling services, located in Brooks, AB | Oil and Gas | 🇳🇴 Oslo | 453 | 1998 |
| 17 | [Infratek](https://www.tamtam.ai/c/infratek-oslo) (vinci-energies.no)<br>Specializing in power supply, we ensure security and efficiency from design through maintenance and operation with a global network of committed employees | Oil and Gas | 🇳🇴 Oslo | 439 |  |
| 18 | [Cool Company Ltd (CoolCo)](https://www.tamtam.ai/c/cool-company-ltd-coolco) (coolcoltd.com)<br>The company specializes in transporting clean natural gas as liquefied natural gas on a fleet of modern carriers | Maritime Transportation | 🇳🇴 Oslo | 384 | 2022 |
| 19 | [Nel Hydrogen](https://www.tamtam.ai/c/nel-hydrogen) (nelhydrogen.com)<br>A hydrogen company listed on the Oslo Stock Exchange, specializing in hydrogen production plants, fueling stations, and power-to-gas solutions for various industries | Renewable Energy Equipment Manufacturing | 🇳🇴 Oslo | 323 |  |
| 20 | [Nord Pool](https://www.tamtam.ai/c/nord-pool) (nordpoolgroup.com)<br>Europe's leading power market offering efficient trading, clearing, and settlement services across multiple countries, with 30 years of experience in the industry | Services for Renewable Energy | 🇳🇴 Oslo | 186 | 1993 |
| 21 | [Frontline Management AS](https://www.tamtam.ai/c/frontline-management-as) (frontlineplc.cy)<br>A management company overseeing a Cyprus-based oil tanker company with one of the world's largest fleets, specializing in international crude oil transportation on major stock exchanges | Maritime Transportation | 🇳🇴 Oslo | 183 | 1996 |
| 22 | [Vow ASA](https://www.tamtam.ai/c/vow-asa) (vowasa.com)<br>A company and its subsidiaries specialize in converting biomass and waste into clean energy and valuable resources, promoting industry decarbonization and material recovery | Renewable Energy Equipment Manufacturing | 🇳🇴 Oslo | 106 | 1993 |
| 23 | [Hystar](https://www.tamtam.ai/c/hystar) (hystar.com)<br>Specializing in advanced PEM electrolysers, the company focuses on large-scale green hydrogen production to reduce greenhouse gas emissions and tackle energy challenges | Renewable Energy Semiconductor Manufacturing | 🇳🇴 Oslo | 64 | 2021 |
| 24 | [Atlantic Marine Services](https://www.tamtam.ai/c/atlantic-marine-services) (dvergsten.com)<br>The company is an offshore support service contractor providing accommodation rigs and drilling rigs to major operators in the oil and gas industry worldwide | Oil and Gas | 🇳🇴 Oslo | 63 | 2004 |
| 25 | [Yinson Renewables](https://www.tamtam.ai/c/yinson-renewables) (yinson-renewables.com)<br>Global independent renewable power producer with assets across the entire renewables value chain in Latin America, Europe, and Asia Pacific. | Renewable Energy Power Generation | 🇳🇴 Oslo | 46 | 2019 |
| 26 | [Hydro Havrand](https://www.tamtam.ai/c/hydro-havrand) (hydro.com)<br>The company specializes in using green hydrogen to replace fossil fuels in heavy industries, maritime sector, and long-distance transport to reduce global CO2 emissions | Renewable Energy Semiconductor Manufacturing | 🇳🇴 Oslo | 6 | 2021 |
| 27 | [Hydrogen Source](https://www.tamtam.ai/c/hydrogen-source) (hydrogen-source.com)<br>A company focused on converting depleted gas fields into clean hydrogen storage sites, providing the world with clean and cheap hydrogen | Oil and Gas | 🇳🇴 Oslo | 4 | 2017 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

## More company lists in Oslo

- [The largest companies in Oslo](https://www.tamtam.ai/l/largest-companies-oslo) (768)
- [Multinational companies in Oslo](https://www.tamtam.ai/l/multinational-companies-oslo) (240)
- [SaaS companies in Oslo](https://www.tamtam.ai/l/saas-companies-oslo) (100)
- [Software Development companies in Oslo](https://www.tamtam.ai/l/software-development-companies-oslo) (95)
- [Retail chains in Oslo](https://www.tamtam.ai/l/retail-chains-oslo) (92)
- [Critical infrastructure operators in Oslo](https://www.tamtam.ai/l/critical-infrastructure-operators-oslo) (72)
- [Financial services firms in Oslo](https://www.tamtam.ai/l/financial-services-firms-oslo) (58)
- [Professional services firms in Oslo](https://www.tamtam.ai/l/professional-services-firms-oslo) (53)
- [Companies with in-house R&D in Oslo](https://www.tamtam.ai/l/r-and-d-companies-oslo) (50)
- [IT Services and IT Consulting companies in Oslo](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-oslo) (50)
- [Public sector organisations in Oslo](https://www.tamtam.ai/l/public-sector-organisations-oslo) (50)
- [Subscription businesses in Oslo](https://www.tamtam.ai/l/subscription-businesses-oslo) (48)
- [Financial Services companies in Oslo](https://www.tamtam.ai/l/financial-services-companies-oslo) (47)
- [Consulting firms in Oslo](https://www.tamtam.ai/l/consulting-firms-oslo) (37)
- [Government Administration companies in Oslo](https://www.tamtam.ai/l/government-administration-companies-oslo) (37)
- [IT services companies in Oslo](https://www.tamtam.ai/l/it-services-companies-oslo) (37)
- [Companies with a mobile app in Oslo](https://www.tamtam.ai/l/companies-with-mobile-app-oslo) (36)
- [Corporate groups and holding companies in Oslo](https://www.tamtam.ai/l/holding-companies-oslo) (36)
- [Retail companies in Oslo](https://www.tamtam.ai/l/retail-companies-oslo) (35)
- [Publicly traded companies in Oslo](https://www.tamtam.ai/l/publicly-traded-companies-oslo) (34)
- [Hotel and hospitality groups in Oslo](https://www.tamtam.ai/l/hospitality-groups-oslo) (33)
- [E-commerce companies in Oslo](https://www.tamtam.ai/l/ecommerce-companies-oslo) (31)
- [Manufacturers in Oslo](https://www.tamtam.ai/l/manufacturers-oslo) (31)
- [AI companies in Oslo](https://www.tamtam.ai/l/ai-companies-oslo) (30)

## The same list elsewhere in Norway

- [Energy companies in Norway](https://www.tamtam.ai/l/energy-companies-norway) (107)

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Source: https://www.tamtam.ai/l/energy-companies-oslo