As home to supermajors, as well as a plethora of smaller, independent energy players, the US boasts one of the largest concentrations of energy personnel in the world. With its insatiable appetite for energy resources, the United States is the world's single largest consumer of oil, using as much as 20.73 million barrels per day as of 2008. Recently, interest has peaked in the vast quantity of untapped natural gas resources in the US, the reserves of which were inventoried in 2008 at 238 Tcf, with producers specifically targeting the nation's promising shale formations for this energy commodity.
Port Operations involves controlling the safe navigation of vessels in and out of the port, including allocating a suitable berth and applying any necessary restrictions. The person in charge of a port will usually be the Harbour Master. Since a seaport, or harbour, straddles land and sea both maritime law and the law of the land apply to ports and is the responsibility of the Harbour Master to ensure that both are adhered to.