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jim hardy
Jan1-13, 10:58 AM
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Hydro-electric systems store gravitational potential energy. They don't store electricity.
And batteries store chemical energy.

To the electric utility dispatcher who must plan ahead which plants to run in order to meet today's demand, a hydro plant is just another source of electricity. Its fuel source is a lake instead of a coalpile, and he'd probably think of lake's inventory as megawatt-hours instead of gallons or acre-feet..

"Stored Electricity" is a not bad way to think of a hydro plant, so long as one accepts it's a convenient shortcut and not a rigorous definition.