Business divisions

ExxonMobil in Norway has major upstream and downstream activities.


In this article

Business divisions


Production: non-operated fields

ExxonMobil has ownership interests in over 20 producing fields on the Norwegian Continental Shelf (NCS), which are operated by others (Equinor and Shell). ExxonMobil’s net production from these fields per day in 2017 was about 168,000 o.e. Barrels.

Fields operated by others (OBO)

2015/16 marked the start-up of Åsgard Subsea Compression. The project is a milestone for new technology in the future development of the Norwegian Continental Shelf (NCS). The company also participates in the finalization of the Ormen Lange Nyhamna Compression Project and the extension of the Nyhamna facility, which were completed in the autumn of 2017.

The Trestakk Project, a subsea connection to Åsgard A, was accepted in November 2016, and the plan for development and operation (PDO) was approved by the government in April 2017. An expansion of gas processing capacity for the Fram-field was accepted in October 2017, while the PDA for the Snorre SEP project, which is a large subsea development around Snorre was submitted in December 2017. ExxonMobil is also participating in the development of the GRAND project, north of Grane.

In 2017, ExxonMobil took part in the completion of 23 production and injection wells.


Fuels marketing

ExxonMobil markets fuel products under the Esso brand. The products are applied as motor fuels in the onshore and marine transportation segments, and for heating of homes and commercial buildings.

In 2017 ExxonMobil in Norway sold its retail petrol stations business to the Irish company DCC plc, who operates the business through its Norwegian subsidiary Certas Energy Norway AS. At 107 sites NorgesGruppen is the operator of store concepts and car wash facilities. In line with long term agreements for the use of the Esso brand and the supplies of fuels from ExxonMobil the petrol stations continue to be Esso branded stations, and the company continues to market both Esso and Mobil branded products.

Commercial Sales is ExxonMobil's sales organization serving the dealer, business-to-business and marine segments with fuels and LPG. The main business is nationwide Norway, but for larger cargos the whole of Scandinavia is covered.In the Marine segment, ExxonMobil is an active marketer of marine gas oil, which meets the ECA-specifications and is produced at the Slagentangen refinery.

Please click here for more information about Commercial Sales' operations and products (in Norwegian only).

Certas Energy Fuels AS is a dealer under the brand name Esso Energi. They are a supplier of diesel to commercial and private customers. Also heating oil and kerosene for heating purposes can be delivered.

More information about their operations and their offer at (in Norwegian only)

Lubricants and specialties

As a supplier of base oils and a marketer of finished lubricating oils, we offer a full range of synthetic lube oils, a broad array of base oils, asphalt and special products.

Our products are sold under the Esso and Mobil brand names and satisfy the highest quality standards.

Lube oils and services are available directly from our production facilities as well as from a number of other authorised distributors.

There is more information about lubricants in Norway on a separate homepage (only in Norwegian) which you find by clicking here.

Download product data sheets.

Download material safety data sheets.

Refining and supply

ExxonMobil’s refinery at Slagentangen near Tønsberg, inaugurated in 1961, is located in a sheltered location by the Oslo Fjord. The refinery processes crude oil, mainly from the North Sea, into fuel products for consumption and industrial purposes.

The annual processing capacity is 6 million tons of crude oil. The production of petroleum products represents more than half of Norway’s total consumption. The lightest products are propane and butane, followed by petrol, kerosene, gasoline (benzin), diesel and light fuel oil. The heaviest product is heavy oil. The Slagentangen refinery produces of course sulphur free diesel (less than 10 ppm sulphur), which is a prerequisite for modern, environmentally friendly cars with catalyst treatment of exhaust gases.

In 2007, the refinery installed a plant for blending of biodiesel. It supplies diesel with up to 7 per cent blend of a bio component. This low blend biodiesel may be used by all diesel cars without causing engine trouble, nor is it in conflict with guarantees given by the car manufacturers. As of January 2016, in order to comply with increased legally mandated bio portion, Slagen blends ethanol into Mogas, in accordance with car manufacturers’ specifications.

At the end of 2016 the refinery started up a new process unit for the upgrading of heavy fuel oil, which increased the value of the Slagen product portfolio.

Approximately 60 percent of the refinery’s production of petroleum products are exported, which makes the refinery one of Norway’s largest onshore export businesses. All crude oil and around 90 percent of the total production is offloaded and loaded at the jetty, which can receive ships up to 190.000 ton deadweight. Every year around 700 ships call on the port.

The Slagentangen office also manages the Supply, Transportation and Distribution businesses. Transportation & Supply handles crude supplies to the Slagen refinery and conducts the trading of petroleum products from the refinery production. ExxonMobil’s trade of crude oil from the fields in the North Sea is handled from the ExxonMobil UK office in Leatherhead. The Distribution department manages the company’s three main storage terminals located in Fredrikstad, Bergen and Trondheim, and the refinery’s truck loading facilities.

Refining process

Crude oil refining is about converting the raw material into the oil products that consumers demand.

Crude oil refining is about converting the raw material into the oil products that consumers demand. Crude oil is pumped ashore from large tankers and into crude oil tanks. From there it is pumped through a heating system (heat exchangers and furnace) to the main distillation tower for a "primary sorting" of the various main components.

The refining processes are monitored and controlled from a control center by means of advanced electronics and computer based control programs.

The loading and discharge of raw material and oil products are handled from a separate control room located by the pier. The control room also monitors the tank farm, the water treatment plant, and various pump operations. The refinery is operated around the clock all around the year, with highly qualified technicians keeping a vigilant eye on operations at all times. Temperatures, pressure and through-put in all parts of the plant may be monitored from the two control rooms. The operation is optimized to get an optimum value added in the form of oil products using the lowest amount of energy possible.

Crude oil

Crude oil is a mixture of hundreds of different types of chemical substances (made up of carbon and hydrogen) called hydrocarbons. No other natural raw material has to the same extent impacted the evolution of contemporary industrial society. Crude oil is fractionated and processed into the products that the market demands. Crude oil comes in all varieties, from very light (e.g. North Sea crudes) to very heavy crudes.

Examples of the composition of three North Sea crudes and one Arabic are provided below, with highly qualified technicians keeping a vigilant eye on operations at all times. Temperatures, pressure and through-put in all parts of the plant may be monitored from the two control rooms. The operation is optimized to get an optimum value added in the form of oil products using the lowest amount of energy possible.

Fuel gas sulfur recovery plant

The sulfur recovery plant is required for the control of the refinery emissions of SO2 and the contribution to acid rain. Sulfur removed from the products in the desulfurization processes, has to be removed from the refinery gas before it is fired in the process furnaces. Thus one achieves that neither the products nor the refinery’s own energy consumption contribute to acidification of the environment. The hydrogen sulphide gas is converted to liquid sulphur which is sold to the paper and pulp processing industry.


These processes remove sulfur from the petrol production feedstock, diesel oil and gas oil.

This happens at high temperature and high pressure in the presence of hydrogen gas and a catalyst (enhances the speed of reactivity). Sulfur is removed as hydrogen sulfide gas which is fed to the sulfur treatment plant.

Visbreaking of heavy oil

The visbreaker converts 25-35% of the heavy bottoms from crude oil distillation into lighter and more valuable products (gas, naphtha and diesel). This is carried out through thermal cracking where heavy oil molecules are exposed to such high temperatures (460ยบC) in the visbreaker furnace that they crack into smaller and lighter molecules.

The converted product is separated through distillation and further processing in desulfurization plants before they can be sold or processed further. The plant provides an important adjustment by bringing the refinery's product yield more in line with market demand. The bulk of the heavy fuel oil production is exported to power plants and as bunker fuel for ships.

Clean fuel gas

After sulfur removal the refinery produced gas is fired in process furnaces to heat up feed to the different plants. The gas consists of hydrogen and light hydrocarbons, mainly methane and ethane.

Petrol plant

Naphtha, which is a lighter fraction of the crude oil, is the raw material for gasoline production. The octane number of the naphtha is too low, and has to be increased before it may be used as motor fuel.

First, sulfur is removed in a desulfurization plant, and next the octane number is increased from around 50 to 100 in a catalytic reformer. It is this product, the reformate, which is the main component in the gasoline marketed at the petrol stations.

The naphtha is mixed with suitable components to make the end product gasoline. By conversion of naphtha to reformate, hydrogen is split from the naphtha molecules, and this hydrogen gas is used in all desulfurization plants.

In 1998, a separate benzene extraction plant was installed to comply with new petrol specifications.


Sulfur components removed in desulfurization processes are converted into pure sulfur (yellow solid at ambient temperature). This non-hazardous material is used by the paper and pulp processing industry.


Naphtha is a light hydrocarbon fraction. Distinction is made between light naphtha with a boiling range from 30-70°C, and heavy naphtha with a boiling range from 60-170°C. Small volumes of light naphtha are mixed into the gasoline, but the bulk of the production goes to the petrochemical industry. The heavy naphtha is feed stock for the petrol production.


LPG, Light Petroleum Gas, is a generic term for propane and butane. LPG is used for heating, transportation fuel, and in the petrochemical industry.

Kerosine/jet fuel

ESSO FYRINGSPARAFIN is a kerosene ideally suited for heating purposes. Until 2000, the product was clear as water and without color. ESSO FYRINGSPARAFIN may be used for all types of wick burners and burner pots. It does not provide a high enough flame before sooting, so for lighting purposes, illuminating kerosene is recommended. As from 20 February 2000 ESSO FYRINGSPARAFIN has a green color. The dye has no effect on  the combustion.

Aviation fuel has the same properties as kerosene, but has to meet much more stringent quality requirements. Slagen produces and supplies two types of aviation fuel – one for the Norwegian defense and one for civil aircraft. The fuel produced for the defense contains additives which makes it better suited for storage.

Unlike kerosene aviation fuel is not colored green.

Diesel/ light fuel oil

For cars and boats, a large number of diesel types, as well as different types of fuels, may be employed.

1. Diesel

Advanced fuel for you and your engine

At Esso we pride ourselves on developing fuels to help your engine run more smoothly. That’s why our advanced fuels have been developed with you and your engine in mind:

  • Diesel 2000. Our regular diesel grade that helps improve your fuel economy

Our fuels are developed to help your car’s engine deliver better performance. They also work at a molecular level to help remove deposits that have formed in your fuel system. This helps your engine’s fuel economy wherever you are driving towards.

Esso diesel has been engineered to help*:

  • Clean diesel fuel injectors
  • Improve fuel economy
  • Improve engine responsiveness
  • Reduce emissions
  • Protect engines from corrosion

We Fuel Progress.

2. Esso Offroad Diesel / Diesel for plants and factories

Esso Offroad Diesel OLJE (diesel oil) is a standard diesel exempted from tax which is employed for special purposes such as construction machines, tractors etc. As from 20.02.2000 the product is colored green.

3. Esso Light Diesel

Esso Lettdiesel  (light diesel) is a kerosene based diesel, which gives the product excellent cold resisting properties, with an operational limit touching -50°C. To avoid increased wear of the diesel pump, lubricant is added to the product. Esso Lettdiesel has a slightly lower cetane rating and density than conventional ADO. When switching to this type of fuel this can be noticed through reduced traction force. If the conditions demand it (low outdoor temperature, tunneling etc.) Esso Lettdiesel may be employed for high-speed diesel engines.

4. Esso Low Sulfur Gas Oil (LSGO)

Esso Lavsvovel Gassolje (LSGO) (Low sulfur gas oil) is a gas oil with good ignition and combustion properties, and with cold resisting properties adapted to summer and winter climates in Norway. The product has a low sulfur contents to meet stricter environmental standards, and good lubrication properties. LSGO is suited for use in marine high-speed and medium speed diesel engines.

5. Esso Fuel Oil No.1

Esso Fyringsolje NR.1 (fuel oil no. 1) is a light fuel oil, with good combustion properties and suited for plants designed for light fuel oil.

6. Esso Marine Gas Oil (MGO)

Esso Marine Gassolje (marine gas oil) is a gas oil with good ignition properties suitable for use in marine high-speed and medium speed diesel engines.

7. Esso Marine Spesial (EMS)

Esso Marine Spesial is a heavy marine distillate quality suitable for use in all marine medium speed diesel engines.

8. Esso Special Fuel Oil (EFS)

Esso Fyringsolje Spesial (special fuel oil) is suitable for use in oil-heating plants with medium large oil burners where the fuel oil may be preheated to meet the proper atomization for viscosity.

Heavy distillates

Heavy distillate (Heavy Atmospheric Gas Oil) is a heavy hydrocarbon fraction with a density of 0.92 kg/l. It contains approx. 0.5 % sulfur and has a dark, brandy-colored hue. HAGO is shipped from Slagentangen to other refineries/chemical industry for further processing.

Heavy fuel oil

The heaviest of our products. It is black in color and contains around 1% sulfur. Heavy oil is used as bunker fuel on tankers, and as fuel oil in heavy industries.


*Emissions refers to CO, HC and NOx. Claims based on one or more of the following: (1) internal or third party vehicle engine testing; (2) government publications; and/or (3) industry or other scientific literature. Basis for comparison for all claims is versus unadditised standard fuel. Available at participating Esso service stations only. Engine type, driving behaviour and other factors may also determine fuel and vehicle performance, including emissions and fuel economy. Digital simulation of product and artistic rendition of engine have been used. Esso, Esso. We Fuel Progress are trademarks of Exxon Mobil Corporation.

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About us

ExxonMobil in Norway includes several companies—Esso Norge AS, ExxonMobil Exploration and Production Norway AS, and ExxonMobil Production Norway Inc.—all of which are affiliates of Exxon Mobil Corporation in the USA. Esso Norge AS is involved in upstream and downstream activities in Norway. Here we use the term ExxonMobil when referring to the companies’ activities in Norway.

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Our history

The history of ExxonMobil’s 125 years in Norway is also to a large extent the story of Norway’s emergence as a modern nation.

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ExxonMobil has a long history of leadership in the petroleum and petrochemical industries, and ExxonMobil Norway’s management team continues that history of excellence.

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Slagen Refinery

Slagen Refinery is situated on the west bank of the Oslofjord about 5 n. miles south of Horten. The marine terminal consists of a pier about 500 m long with loading/discharging berths on both sides. To the south of the long pier there is a small harbour where mooring boats and oil recovery equipment are kept. The terminal and its near surroundings are owned and controlled by Esso Norge AS. It has its own Harbour Office with Marine Supervisors on duty 24 hours a day.

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Brands and products

Worldwide, ExxonMobil markets fuels and lubricants under three brands.

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