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An energy crisis is any significant bottleneck (or price rise) in the supply of energy resources to an economy. In popular literature, it often refers to one of the energy sources used at a certain time and place, in particular those which supply national electricity grids or those used as fuel in vehicles. Industrial development and population growth have led to a surge in the global demand for energy in recent years. In the 00s, this new demand — together with Middle East tension, the falling value of the U.S. dollar, dwindling oil reserves, concerns over peak oil, and oil price speculation — triggered the 2000s energy crisis, which saw the price of oil reach an all-time high of $147.30 a barrel in 2008. == Causes == Government actions like tax hikes, nationalisation of energy companies, and regulation of the energy sector, shift supply and demand of energy away from its economic equilibrium. Market failure is possible when monopoly manipulation of markets occurs. A crisis can develop due to industrial actions like union organized strikes and government embargoes. The cause may be over-consumption, aging infrastructure, choke point disruption or bottlenecks at oil refineries and port facilities that restrict fuel supply. An emergency may emerge during very cold winters due to increased consumption of energy. Large fluctuations and manipulations in future derivatives can have a substantial impact on price. Large investment banks control 80% of oil derivatives as of May 2012, compared to 30% only a decade ago. This increase contributed to an improvement of global energy output from 117 687 TWh in 2000 to 143 851TWh in 2008.〔Eenergiläget in Sweden 2012 figure 49000 and 53〕 Limitations on free trade of derivatives could reverse this trend of growth in energy production. Kuwaiti Oil Minister Hani Hussein stated that "Under the supply and demand theory, oil prices today are not justified," in an interview with Upstream. Pipeline failures and other accidents may cause minor interruptions to energy supplies. A crisis could possibly emerge after infrastructure damage from severe weather. Attacks by terrorists or militia on important infrastructure are a possible problem for energy consumers, with a successful strike on a Middle East facility potentially causing global shortages. Political events, for example, when governments change due to regime change, monarchy collapse, military occupation, and coup may disrupt oil and gas production and create shortages. Fuel shortage can also be due to the excess and useless use of the fuels. 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「Energy crisis」の詳細全文を読む スポンサード リンク
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