Dong Energy is an integrated energy company with its headquarters located in Denmark. The company was founded in 1972. In the beginning the company was named as Dansk Naturgas A/S; this was changed to Dong Energy in 2002. In 2006, it acquired five Danish energy companies: Elsam, ENERGI E2, Nesa, Copenhagen Energy, and Frederiksberg Forsyning. Dong is involved in several business activities with it operations spanning across various countries of Northern Europe. The business activities of the company include oil and gas exploration & production (E&P), wind power, thermal power, energy markets and sales & distribution. As of December 2011, the owners of the company were the Danish State, SEAS-NVE Holding, Syd Energi Net and others with a working interest of around 76.5%, 10.8%, 7.0% and 5.7% respectively.