Today, 250 of the world’s leading energy storage experts have gathered at Pacific Northwest National Laboratory to discuss the latest battery technologies, from large liquid and sodium sulfur batteries to new poly-ionics. But to store enough energy to power a city for a day, you need a train filled with a million pounds of rock. Going up and down a hill like Sisyphus, Advanced Rail Energy Storage (ARES) converts excess renewable energy into gravitational potential energy then back into electricity when needed. With no water and no turbines.

from Forbes – Tech http://ift.tt/20FvTeP
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