Lawrence Jenkins wrote:
"Bonos Ego" wrote in message
oups.com...
Hello all,
snipRegards,



The National grid is AC current and as far as I know you can't store
ac current like you can DC i.e a battery. I suppose if water driven
turbines like Tesla's design at Niagra falls -you could use the extra
electrical energy to pump water back up to reservoirs to use gravity
to bring it back through the turbine driven polyphase generators when
needed. But as I said it's difficult to store AC. Anyone know better?

That's the Holy Grail of renewables - at the moment the best we get is huge
rechargables (football pitch sized!) that can only supply (via inverters) a
backup service:

http://www.abb.com/cawp/seitp202/8C9...F002F2DB1.aspx