A small group of fields account for the bulk of Norways total Natural Gas production. The single largest field is Troll, which produced 3.11 Bcf per day (Bcf/d) during the first half of 2006 and represents about one-third of Norways total natural gas production. Other important fields include Sleipner Ost (1.45 Bcf/d), Asgard (1.00 Bcf/d), and Oseberg (0.72 Bcf/d). These four fields compose over 70 percent of Norways total natural gas production. Despite the maturation of its major natural gas fields in the North Sea, Norway has been able to sustain annual increases in total natural gas production by incorporating new fields. In October 2004, the Kvitebjorn field came onstream with an expected production level of 710 million cubic feet per day (Mmcf/d). In November 2005, Statoil brought the Halten Bank West project onstream, which includes the Kristin field and four additional satellite fields (Lavrans, Erlend, Morvin, and Ragnfrid). Over the long term, Norway is counting on non-North Sea projects to provide significant natural gas production. In the Norwegian Sea, Norsk Hydro is currently developing the Ormen Lange field. The project consists of an offshore production facility and a subsea Pipeline linking the field to the gas processing terminal in Nyhamma. In addition, the Ormen Lange project includes a pipeline linking Nyhamma to Easington, England (see below). Ormen Lange holds an estimated 14 Tcf of recoverable reserve and will have a full production capacity of 710 Bcf per year. Shell will take over as Operator of the project from Norsk Hydro in the production phase, which is scheduled to begin in late 2007. Also in the Norwegian Sea, Shell announced in 2005 that it had made a major discovery in the Onyx prospect, west of the companys existing Draugen field. According to the Norwegian Petroleum Directorate (NPD), the find could contain as much as 2.1 Tcf of recoverable gas reserves. In 2005, Norsk Hydro reported that it made a discovery at its Stetind project in the Norwegian Sea, containing estimated natural gas reserves of 0.5-1.3 Tcf.