Founded as Hess Incorporated in 1933, the company has grown from a small residential fuel oil delivery service to a leading independent energy company. Hess Denmark is primarily invested in The South Arne field, about 150 miles west of Esbjerg in the Danish North Sea. It has produced oil and gas since 1999 and uses horizontal production and water-injection wells to optimize production from a tight chalk reservoir. In 2010, in partnership with DONG and Danoil, Hess committed to a significant expansion of the field, which is expected to produce another 30 million barrels of oil. Hess maintains offices in Copenhagen.