Except the water is in short supply, so where's that magically coming from? The Great Salt Lake is shrinking and specific to Utah. Just look at Lake Meade and Hoover Dam as an example.
moreover, If you built a pumped storage facility on lake Meade, it would have greater height and power from release the lower the lake was
The water requirements for pumped hydro for seasonal storage is a lot less than for generation.
- pumped hydro reuses the water in a loop rather than sending it downstream like generation
- pumped hydro only needs to produce power a few times a year rather than 24/7/365 like generation.