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:
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—Germaine Greer (b. 1939)
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“It was evident that the same foolish respect was not here claimed for mere wealth and station that is in many parts of New England; yet some of them were the “first people,” as they are called, of the various towns through which we passed.”
—Henry David Thoreau (1817–1862)