Cenovus Energy is a Calgary-headquartered Canadian integrated energy company that develops oil and natural gas assets, upgrades and refines crude, and markets fuels and other energy products across North America. Operating in Canada, the United States and the Asia Pacific region, it also runs ethanol plants in Western Canada that turn grain into ethanol and a high-protein livestock-feed co-product. Cenovus began independent operations in 2009 and expanded its integrated operations through the 2021 acquisition of Husky Energy, whose roots reach back to a 1938 refinery operation.
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Obsidian Energy LtdCalgary-based Obsidian Energy Ltd. explores, develops and produces oil and natural gas from a focused portfolio of Alberta assets. Its distinctive operating mix pairs a large, contiguous Peace River heavy-oil land base with light-oil properties in Willesden Green and Viking, and the company reported average production of 28,200 boe/d in the second quarter of 2026. Obsidian also operates owned infrastructure across its core areas, supporting continued drilling and development.EDINBORO, PA
Guardian EnergyBorn in 2009 from a group of farmer-owned ethanol cooperatives, Guardian Energy turns locally grown Midwest corn into renewable fuel and useful animal-feed co-products. The company operates three production plants in Janesville and Lima, plus Hankinson, under a management team based in Prior Lake, and processes about 50 million bushels of corn each year. Its dry-mill operation also recovers corn oil and produces low-carbon-intensity ethanol from corn fiber.LIMA, OH
Marathon Petroleum CorporationFrom its Findlay headquarters, Marathon Petroleum Corporation runs the nation’s largest refining system, turning crude oil into fuels and industrial petroleum products while connecting them to markets through an integrated midstream network. The company operates 13 refineries with approximately 3 million barrels per day of capacity, markets fuel through Marathon and ARCO locations, and holds a majority interest in MPLX LP. MPC traces its energy heritage to the 1800s and also produces renewable fuels as it works to lower the carbon intensity of its operations.FINDLAY, OH
ConocoPhillipsHouston-headquartered ConocoPhillips is an independent exploration and production company that explores for, produces, transports and markets oil and natural gas worldwide. Its operations and activities span 15 countries, with a notable Alaska presence built over more than 50 years; the company is Alaska’s largest oil producer and operates major production hubs on the North Slope. ConocoPhillips places safety and environmental stewardship at the center of its global work.WADSWORTH, OH