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The Crescent Dunes Solar Energy Project is a 110 megawatt (MW) net solar thermal power project located near Tonopah, about northwest of Las Vegas.〔 〕 It was developed by SolarReserve through its subsidiary, Tonopah Solar Energy,〔 (【引用サイトリンク】title=Crescent Dunes ) 〕 and was anticipated to cost less than $1 billion.〔 The project includes 17,500 heliostat mirrors that collect and focus the sun's thermal energy to heat molten salt flowing through an approximately tall solar power tower. The molten salt circulates from the tower to a storage tank, where it is then used to produce steam and generate electricity. Excess thermal energy is stored in the molten salt and can be used to generate power for up to ten hours, including during the evening hours and when direct sunlight is not available.〔 Under a power purchase agreement (PPA) between SolarReserve and NV Energy, all power generated by the Crescent Dunes project in the next 25 years will be sold to Nevada Power Company for $0.135 per kilowatt-hour.〔 〕 In late September, 2011, Tonopah received a $737 million loan guarantee from the U.S. Department of Energy (DOE).〔 Ground was broken on the project September 1, 2011. Construction terminated at the end of 2013, followed by several months of testing the plant systems. Melting about of salt takes two months. Once melted, the salt stays melted for the life of the plant and gets cycled through the receiver for reheating. The project entered commissioning phase in February 2014 following completion of construction.〔(【引用サイトリンク】title=Crescent Dunes Solar Energy Project, Nevada, United States of America )〕 It has been operational since September 2015. File:Crescent Dunes Solar August 2014.JPG|Completed site as seen from a commercial airliner. File:CrescentDunes.jpg|The solar tower under construction as seen from a commercial airliner. The eponymous Crescent Dunes are at lower right. File:Crescent Dunes Solar December 2014.JPG|Completed site. == Notes == 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「Crescent Dunes Solar Energy Project」の詳細全文を読む スポンサード リンク
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