BBC News: Molten metal batteries for the grid

[Tom Azlin W7SUA]

Another example are two dams on the Salt River northeast of Phoenix AZ. 
The pumped storage units at Horse Mesa Dam ( 97MW) and Mormon Flat Dam ( 
50MW)  that were installed in 1971 and 1972 as a part of conversion from 
25 Hz to 60Hz. I did not realize 25Hz power was being generated as late 
as that.

Perhaps lots of example of pumped storage units?

73, tom w7sua

On 9/21/2014 6:16 PM, Ed Dunlop wrote:
> Oops!  Right name but wrong location. It's actually located in PA but
> near the Susquehanna River north of Conowingo Dam.
>
> -- (c) © Ed Dunlop. Todos los derechos reservados. 1265 Estate Dr ..W
> Chester PA 193 80  USA   m-67
>
>> On Sep 21, 2014, at 9:02 PM, Ed Dunlop <ed at computer.org> wrote:
>>
>> A good example of an already running water based system is PECO
>> Energy's "Muddy Run Pumped Storage" facility north of Philadelphia
>> near the Delaware River.
>>
>> Ed N3DJH