The state of Utah was apparently not interested in the scientific question. That's just engineering details to be worked out later. No, the most important question is how much environmental damage will their perpetual motion machine cause?
OK, the project actually seeks to time-shift energy usage by doing the pumping in off-peak hours and using to generate power during peak hours. But it's still a net loss of electricity, despite the claim in the article that:
Symbiotics LLC, in arguing for the project, pointed to hydroelectricity's renewable energy potential and claimed the project could meet about 85 percent of Utah's current peak energy demands if used in concert with conservation efforts.
They still need a power plant somewhere to supply 100% of Utah's current power demands, plus whatever additional this Roosevelt-esque make-work project. That would be, for the math challenged among you, greater than 100%. It's theoretically possibly they'd have to build a new power plant to meet the extra demand. I guess they plan to make it up in volume.
These people better not laugh too hard at the penis thievery panic in the Congo.