Imperial Oil
A major Canadian integrated petroleum and natural-gas company operating upstream, refining, petrochemical, wholesale and Esso-branded retail businesses.
Last updated August 31, 2026
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Overview
Imperial Oil Limited is a Canadian integrated energy company headquartered in Calgary, Alberta. Established in 1880 by Jacob Lewis Englehart and a group of Ontario oil refiners and producers, it was created partly as a Canadian response to the growing influence of Standard Oil in the petroleum market. The company’s original charter covered the discovery, production, refining and distribution of petroleum and petroleum products across Canada. Imperial developed from an early refining consortium into one of Canada’s largest petroleum companies. Its activities now span exploration and production, oil-sands mining, crude oil and bitumen production, natural-gas production, refining, petroleum-product marketing and petrochemicals. Much of its resource base is in Alberta’s oil sands, while the Norman Wells oil field in the Northwest Territories has also been an important producing asset. Imperial operates the Kearl oil-sands project and owns a minority interest in Syncrude, one of the world’s major oil-sands operations. Downstream, Imperial is one of Canada’s principal refiners and petrochemical producers. Its products include crude oil, diluted bitumen, natural gas, gasoline, diesel, jet fuel, heating products, lubricants, asphalt and other refined or chemical products. Fuel is marketed through the Esso brand, with Mobil branding also used in selected Canadian retail arrangements. Imperial licenses these international brands from ExxonMobil and has historically supplied a large network of independently owned service stations, convenience and commercial-fuel outlets. The company became closely linked to Standard Oil at the end of the nineteenth century. Standard Oil acquired a majority interest in Imperial in 1898, and ownership later passed through Jersey Standard, which became Exxon. Following Exxon’s merger with Mobil in 1999, ExxonMobil became Imperial’s majority shareholder. Imperial and ExxonMobil remain legally separate publicly traded companies, although they have maintained extensive commercial and service relationships involving technology, procurement, financing, payroll and technical support. Imperial’s history includes several turning points in Canadian energy development. Its early refining business was consolidated in Petrolia, Ontario, after competitive and operational difficulties. The 1947 discovery of the Leduc Woodbend Devonian oil field helped initiate the modern era of Canadian oil and gas development. Imperial later expanded through the acquisition of Texaco’s Canadian operations in 1989 and through increased participation in oil-sands production and integrated refining. Imperial is a significant participant in Canada’s energy economy but operates in a sector exposed to commodity-price cycles, environmental regulation, carbon policy, Indigenous and community expectations, capital intensity and public debate about oil-sands development. Its Arctic and northern-resource activities have also received environmental-performance scrutiny. The company remains active in Canada as an integrated petroleum business, with ExxonMobil as its controlling shareholder and Esso as its best-known consumer-facing brand.
History
Imperial Oil was organized in April 1880 in London and Petrolia, Ontario, by Jacob Lewis Englehart and 16 prominent oil refiners and producers. The founders sought to consolidate Canadian refining and distribution in response to Standard Oil’s increasing market power. The new company controlled most Canadian refining capacity at formation and stated an ambition to find, produce, refine and distribute petroleum throughout Canada. The early business struggled as new American oil discoveries weakened prices and Standard Oil increased exports into Canada. Imperial closed most of the refineries acquired at formation and concentrated activity at its Silver Star refinery in Petrolia after the Victor works in London burned in 1883. In 1884 the company obtained rights to Herman Frasch’s fractional-distillation process, which improved the separation of crude oil into usable products. Frasch later developed a copper-oxide process for removing sulphur from Canadian crude, although he left Imperial and joined Standard Oil before the process became a long-term Imperial advantage. During the 1890s, Imperial faced competition from Standard Oil subsidiaries, particularly in Quebec and the Maritimes. Changes to Canadian tariffs and transport rules made imported petroleum more competitive. After negotiations for a possible sale to a British company failed, Imperial’s directors agreed in 1898 to a transaction with Standard Oil. Standard acquired a majority of Imperial’s shares, Imperial absorbed Standard’s Canadian subsidiaries and the company increased its capitalization. Imperial subsequently shut the Petrolia refinery and moved its principal refining operations to Sarnia. The 1911 dissolution of Standard Oil in the United States transferred ownership of Imperial through Jersey Standard, one of Standard Oil’s successor companies. Jersey Standard later became Exxon. Imperial continued to operate as a Canadian company while remaining closely connected to its American parent through ownership, technology and management relationships. A defining event occurred when Imperial drilled Leduc No. 1 beginning in November 1946 and announced the Leduc Woodbend Devonian discovery in 1947. The find opened a major new phase of Canadian petroleum development and supported expansion of related infrastructure, refining and marketing. Imperial subsequently developed conventional and oil-sands resources and became a major Canadian integrated producer. In 1989 Imperial acquired Texaco’s Canadian operations. Its consumer business expanded under the Esso name, while the company also developed a substantial refining, petrochemical and commercial-fuel presence. After Exxon and Mobil merged in 1999, ExxonMobil retained majority ownership of Imperial. Imperial and ExxonMobil have remained separate legal and stock-market entities but have used a range of intercompany service and operating arrangements. Imperial’s modern resource portfolio is centered largely on Alberta oil sands, including the Kearl mining operation and a 25 percent interest in Syncrude, together with conventional production such as Norman Wells. Its downstream network includes Canadian refineries, petrochemical facilities, wholesale supply and a large set of independently owned Esso-branded stations. In 2016 Imperial sold its remaining company-owned retail stations to third-party operators. The company continues to face the economic, regulatory and environmental pressures affecting Canadian oil and gas, including scrutiny of oil-sands emissions and northern-resource operations.
- 2018
PC Optimum rewards transition
[1]Esso-branded stations begin participating in Loblaw’s PC Optimum program.
- 2016
Retail-station divestment
[1]Imperial sells its remaining company-owned service stations to third-party operators.
- 2005
Headquarters move to Calgary
[1]Imperial relocates its headquarters from Toronto to Calgary, Alberta.
- 1999
ExxonMobil is formed
[1]Exxon and Mobil merge; the combined company becomes Imperial’s majority shareholder.
- 1989
Texaco Canada acquisition
[1]Imperial acquires Texaco’s Canadian operations.
- 1947
Leduc discovery
[1]Imperial’s Leduc Woodbend Devonian discovery begins a new era of Canadian oil and gas development.
- 1911
Ownership passes through Jersey Standard
[1]Following the breakup of Standard Oil, Imperial becomes associated with Jersey Standard, the predecessor of Exxon.
- 1898
Standard Oil acquires control
[1]Standard Oil acquires a majority stake in Imperial and Imperial takes over Standard’s Canadian subsidiaries.
- 1884
Fractional-distillation technology is acquired
[1]Imperial obtains exclusive use of Herman Frasch’s fractional-distillation patent for petroleum refining.
- 1880
Imperial Oil is founded
[1]Jacob Lewis Englehart and 16 Ontario oil refiners and producers establish Imperial Oil to consolidate Canadian petroleum refining and distribution.
Products and positioning
Integrated Canadian energy company combining oil-sands and conventional resource production with refining, petrochemicals and Esso-branded fuel marketing.
upstream energy
Upstream crude oil and bitumen
Imperial produces conventional crude oil and oil-sands-derived bitumen, including production from Alberta assets and the Kearl oil-sands operation. Bitumen may be processed or diluted for transport, while the company’s integrated structure connects resource production with refining and petroleum-product marketing.
upstream energy
Natural gas
Natural gas is part of Imperial’s Canadian exploration and production portfolio. Production has historically included northern and western Canadian resource holdings and supports the company’s broader position as an integrated petroleum and natural-gas producer.
retail fuel
Esso fuels and service stations
Imperial supplies fuel to Esso-branded Canadian service stations. Most stations are operated by third parties, while Imperial provides petroleum supply and brand licensing. The retail offer includes gasoline, diesel, convenience products and electronic payment or loyalty integrations that have changed over time.
refining
Refined petroleum products
Imperial refines crude oil into gasoline, diesel, jet fuel, heating products, lubricants, asphalt and other petroleum products for retail, wholesale, industrial and commercial customers across Canada.
chemicals
Petrochemicals
The company produces and markets petrochemical products associated with its integrated refining and manufacturing operations. These products serve industrial customers and extend Imperial’s business beyond fuels and crude production.
Controversies
2023
Imperial Oil reports a tailings release at its Kearl oil-sands operation
Imperial Oil disclosed that contaminated water associated with the Kearl oil-sands operation had migrated outside the mine site. The event prompted regulatory investigations, public criticism, Indigenous-community concerns, and requirements for additional monitoring and reporting.
2023
Kearl tailings-water release and notification controversy
Contaminated water associated with Imperial's Kearl oil-sands operation migrated outside the mine site. The incident generated regulatory scrutiny and criticism from Indigenous communities, environmental groups, and public officials regarding monitoring, disclosure, and the handling of tailings-related risks.
Marketing campaigns
- 1934Hockey Night in Canada sponsorship
Canada
Imperial sponsored Hockey Night in Canada on radio and television from the 1934–35 season through the 1975–76 season. Esso’s three-star signage was associated with the broadcast’s three stars of the game.
Outcome. Long-running national brand association with Canadian hockey broadcasting.
Brand decisions
2025
Announce restructuring and Calgary campus saleStrategyBackground
Imperial cited changing business conditions, reduced office-space needs and operational transformation.
Action taken
The company announced approximately 900 job reductions and plans to sell its Calgary campus.
Aftermath
The announcement generated criticism and debate about the company’s workforce strategy and the future of Calgary’s energy sector.
2018
Change fuel-loyalty partnershipStrategyBackground
Imperial’s Esso network ended its participation in Aeroplan and sought a new Canadian loyalty arrangement.
Action taken
Esso-branded stations joined Loblaw’s PC Optimum program beginning June 1, 2018.
Aftermath
The change connected Esso retail fuel purchases with PC Optimum rewards.
2016
Sell remaining company-owned service stationsStrategyBackground
Imperial shifted its retail model toward third-party station ownership while retaining supply and brand relationships.
Action taken
The company sold its remaining 497 company-owned stations to several Canadian retail operators.
Aftermath
Imperial continued supplying and licensing Esso or Mobil-branded stations without owning the divested retail sites.
1989
Acquire Texaco CanadaM&ABackground
Imperial pursued expansion of its Canadian petroleum and retail operations.
Action taken
Imperial acquired Texaco’s Canadian business.
Aftermath
The transaction expanded Imperial’s downstream presence and contributed to the growth of its Esso-branded network.
1898
Accept Standard Oil majority investmentM&ABackground
Imperial faced persistent competition from Standard Oil and weaker access to several Canadian regional markets.
Action taken
The board agreed to sell Standard Oil a majority interest and combine Imperial with Standard’s Canadian subsidiaries.
Aftermath
Imperial became part of the Standard Oil ownership lineage that later led to Exxon and then ExxonMobil.
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