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This is a pumped storage hydro power plant. It enables one of a very few ways to store electricity. The principle is that electric power from the grid is used at times of surplus to pump water up into a reservoir, then the water can be released to provide power at a time when there is a demand that the grid is having difficulty meeting, or when providing this power would be more expensive.
The engineering of the plant relies on hydro pump/turbines which can carry out either duty, and in fact can quickly reverse in duty if required. The generating mode can be reached in a few seconds if needed, to compensate for instance for another unit on the grid tripping out.

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