Suncor Energy Inc. is a Calgary-based integrated energy company that primarily develops petroleum resource basins in Canada's Athabasca oil sands and explores, acquires, develops, produces, transports, refines, and markets crude oil and petrochemical products in Canada and internationally. The company operates through Oil Sands, Exploration and Production, Refining and Marketing, and Corporate and Eliminations segments. Additionally, Suncor Energy Inc. markets and trades in crude oil, natural gas, byproducts, refined products, and power.