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Natural gas in the United States was the nation's second-largest source of energy in 2014, after petroleum. Gas provided 28 percent of the energy consumed.〔US Energy Information Administration,(Overview ), accessed 19 February 2010.〕 In 2012, the US produced 25.3 trillion cubic feet of marketed natural gas, with an average wellhead value of $2.66 per thousand cubic feet, for a total wellhead value of $67.3 billion.〔(Marketed natural gas production, and average wellhead price ), US EIA.〕 The natural gas industry includes exploration for, production, processing, transportation, storage, and marketing of natural gas and natural gas liquids.〔American Petroleum Institute, (), accessed 20 February 2010.〕 The exploration for and production of natural gas and petroleum form a single industry, and many wells produce both oil and gas. The US has been the world's largest producer of natural gas since 2009, when US production surpassed Russia's. In 2013, the US produced 30.0 trillion cubic feet (TCF) of marketed gas.〔(US Energy Information Administration )〕 The leading gas-producing area in the United States in 2013 was Texas (7,545 Billion cubic feet (BCF), followed by Pennsylvania (3,259 BCF), and Louisiana (2,407 BCF).〔(US Energy Information Administration )〕 Production of natural gas was increasing rapidly as of early 2015. US Natural gas production achieved new record highs for each year from 2011 through 2014. Marketed natural gas production in 2014 was 74.7 billion cubic feet per day, a 44% increase over the rate of 51.9 billion cubic feet per day in 2005. In April 2015, natural gas was produced at the rate of 79.4 billion cubic feet per day.〔US EIA, (Natural gas wellhead value and marketed production ), accessed 30 July 2015.〕 Because of the greater supply, consumer prices for natural gas are significantly lower in the US than in Europe and Japan.〔()〕 The low price of natural gas in the US, together with its smaller carbon footprint compared to coal, has encouraged a rapid growth in electricity generated from natural gas. Between 2005 and 2014, US production of natural gas liquids (NGLs) increased 70%, from 1.74 million barrels per day in 2005 to 2.96 million barrels per day in 2014. The US has been the world's leading producer of natural gas liquids since 2010, when US NGL production passed that of Saudi Arabia. Although the United States leads the world in natural gas production, it is only fifth in proved reserves of natural gas, behind Russia, Iran, Qatar, and Turkmenistan. ==Industry structure== (詳細はTop natural gas producers in the United States, 2009 In 2009, the production owned by the top ten companies was 31% of total US natural gas production.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Natural gas in the United States」の詳細全文を読む スポンサード リンク
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