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Can you power a city using just batteries?

With remarkable ingenuity, technicians have used physical forces and states to store energy for later release

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The world's first utility-scale concentrating solar power plant in the desert of Tonopah, Nevada uses extremely hot salt (above) to extend the use of solar energy way past sundown.

BT_20170605_NAHSOURCE5V0KE_2918851.jpg
The world's first utility-scale concentrating solar power plant in the desert of Tonopah, Nevada uses extremely hot salt to extend the use of solar energy way past sundown (above).

New York

WHAT if you need a battery? A really big one - big enough to run a city?

It's a question that inventors have been tackling for decades. No one wants the fridge, or the hospital, going on the blink when demand surges or the power plant needs repairs.

It turns out to

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