Our Pick
Posted on @rawstates
The Bath County pumped storage
1985
Bath County Pumped Storage Station, Warm Springs, Virginia
Z22 · CC BY-SA 4.0 · Wikimedia Commons
Two reservoirs a quarter mile apart in elevation trade the same water back and forth: pumps push it uphill when power is cheap at night, and it falls back through six turbines when the grid needs three gigawatts in a hurry, which it can deliver in minutes. It was the largest energy storage installation on earth for decades and is still often called the world's biggest battery. Nothing about the mountain suggests it is there.
That was 1 of the hidden places.
Location: historic site
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