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In page Geothermal power:

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An organic fluid based binary cycle power station was first demonstrated in 1967 in the Soviet Union[6] and later introduced to the United States in 1981[citation needed], following the 1970s energy crisis and significant changes in regulatory policies. This technology allows the use of temperature resources as low as 81 °C (178 °F). In 2006, a binary cycle station in Chena Hot Springs, Alaska, came on-line, producing electricity from a record low fluid temperature of 57 °C (135 °F).[8]