Mitsui USA's Energy Division specializes in global trading of petroleum products, including crude oil, heavy oil and petroleum coke, as well as importation of liquid natural gas (LNG), and E & P (Exploration & Production) activities in oil and gas.

By utilizing its knowledge of LNG, including terminaling (loading/discharging of LNG), the Division operates in the natural gas market, and also participates in upstream activities in oil and gas fields. It is engaged in the supply chain management (SCM) of petroleum coke from refineries to end users, including U.S. domestic transportation; transoceanic distribution of petroleum coke, crude oil, and petroleum products; coordination of the producers and customers for such products as petroleum coke, bunker, and lubricant; and business alliances with U.S. companies in the exploration of gas fields and investments in natural gas fields.

The Energy Division participates in a significant share of the world oil trading as well as using its valuable experience in investing in E & P and LNG projects around the world, primarily utilizing partnerships with major oil companies. With its transoceanic logistics capabilities, it conducts business in the U.S., Canada, Mexico, Brazil, Chile, Japan, China, Korea and Europe, participating in transactions that involve one million tons in petroleum coke transactions annually. With support from Westport Petroleum, Inc., a Mitsui USA subsidiary, the Division also trades about 400,000 barrels of petroleum products daily.