How an #abandoned #goldmine will be converted into world's first Pumped #Hydroelectric #Energy Storage System #PHES https://www.theguardian.com/sustainable-business/2016/sep/12/energy-storage-how-an-abandoned-goldmine-will-be-converted-into-a-world-first?CMP=share_btn_tw …
7:14 AM - 13 Sep 2016
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