An underground power station is a type of hydroelectric power station constructed by excavating the major components (e.g. machine hall, penstocks, and tailrace) from rock, rather than the more common surface-based construction methods.
Often underground power stations form part of pumped storage hydroelectricity schemes, whose basic function is to level load: they use cheap or surplus off-peak power to pump water from a lower lake to an upper lake, then, during peak periods (when electricity prices are often high), the power station generates power from the water held in the upper lake.
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Famous quotes containing the words underground, power and/or station:
“... in a history of spiritual rupture, a social compact built on fantasy and collective secrets, poetry becomes more necessary than ever: it keeps the underground aquifers flowing; it is the liquid voice that can wear through stone.”
—Adrienne Rich (b. 1929)
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“Say first, of God above, or Man below,
What can we reason, but from what we know?
Of Man what see we, but his station here,
From which to reason, or to which refer?
Thro’ worlds unnumber’d tho’ the God be known,
‘Tis ours to trace him only in our own.
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—Alexander Pope (1688–1744)