Most of the water still moves down stream. You only pump upstream while the sun ...

		foxhop on April 2, 2019 \| parent \| context \| favorite \| on: Idaho sets record low solar price as it starts on ... Most of the water still moves down stream. You only pump upstream while the sun is out _and_ you have spare capacity from solar. Essentially you use the reservoir on the top of the dam as a battery. You charge it up when you have extra energy capacity.