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ENECO,2014,47(4):68～69美国从2006年开始生产页岩气,至今产量已占天然气产量的40%以上,使美国成为超过俄罗斯的世界最大天然气生产国。随着有竞争力的页岩气供应量增加,天然气价格急速下跌。2007年美国的天然气价格超过日本进口价格,2012年下跌至日本进口价格的1/5～1/6。受天然气价格下跌影响,远离煤炭产地的电力公司,燃料由煤炭转向天然气。国内用煤炭作燃料的电力供应量所占比率由50%降
ENECO, 2014,47 (4): 68 ~ 69 The United States started producing shale gas in 2006 and has now produced more than 40% of its natural gas output, making the United States the largest natural gas producer in the world over Russia. As the supply of competitive shale gas increased, natural gas prices plunged. In 2007, natural gas prices in the United States surpassed those in Japan and dropped from 1/5 to 1/6 of Japan's import prices in 2012. Affected by the drop in natural gas prices, the power company far away from the coal producing place shifted its fuel from natural gas to coal. The domestic ratio of electricity supply with coal as fuel dropped from 50%