BBC News: Molten metal batteries for the grid

[Nan and Sandy Sanders]

Same idea but without water. 
http://www.scientificamerican.com/article/energy-storage-hits-the-rails-out-west/ 

25Hz power is still around 
http://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_power_system
40Hz power is still around 
http://en.wikipedia.org/wiki/Mechanicville_Hydroelectric_Plant
      Sandy
     WB5MMB


At 09:38 AM 9/22/2014, Tom Azlin W7SUA wrote:
>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 
>_______________________________________________ 
>Tacos mailing list Tacos at amrad.org 
>https://amrad.org/mailman/listinfo/tacos </x-flowed>