Coal Mines Reimagined as New Power Source

World News: . []

Coal-mine companies in the U.S. and Germany are trying to turn their old mines into enormous power-storage systems, using century-old technology to keep the lights on when a shortage of wind or sun makes new technologies inadequate.

Read More: https://www.wsj.com/articles/coal-mines-are-reimagined-as-a-new-power-source-1495713601?mod=pls_whats_news_us_business_f

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