The largest oil and natural gas producer in the EU, the United Kingdom retains proven crude oil reserves of around 4 billion barrels and proven natural gas reserves of some 18.8 Tcf as of 2006. Containing the bulk of domestic reserves and an extensive network of subsea pipelines and infrastructure, the UK Continental Shelf (UKCS) is the most active offshore region for the UK's oil and gas sector, and industry giants Shell, ExxonMobil, Chevron and Total all explore and produce there. The third largest global energy company and headquartered in the UK, BP is operator of such major offshore UK producers as the Foinaven and Forties fields.
Facilities engineers oversee the design and construction of various production and utility systems in a given facility, ranging from offshore platforms to onshore plants. They assist with designing the layout and systems including everything from power sources, climate control, water and lighting to more specialized systems such as those processing chemicals or environmental controls. Many facilities engineers are also involved with the ongoing operations of this equipment, suggesting maintenance schedules and consulting on future renovations and construction.