“... Of the six units, three can pump water or generate power...”
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What do you suppose that means?
I thought that there were only 3 units. Regardless, if they can pump or generate, it means that at night when demand is low, they can theoretically run electric pumps to pump water back up into the reservoir. That provides more stored energy for daytime peaks, and evens out the nighttime load as well..
Look up pumped storage plants. We have one nearby called Raccoon Mountain. There are several around the country.
Revisiting the power plant, there are, in fact 6 generating units there, 3 of which are also able to pump water back up to the reservoir. The 3 generator-only units are 132 MW each, while the 3 generator/pumps are capable of generating at 141 MW. I’m not sure of the electrical load they present when pumping, but based on other pumped storage units, it’s probably similar to their generating capacity.
The plant, as a whole, can pass almost 17,000 cfs when all units are generating, and in pumping mode, can pump about 5600 cfs total between the 3 pumps.
I was surprised to see this facility having pumping capability.