Links to some interesting articles about energy storage methods (other than pumped hydropower storage):
Compressed air energy storage in depleted naural gas reservoir.
Compressed air energy storage plants -- plans for building two such facilities in Pacific Northwest.
The
Electric Storage Associacion
Web site.
Click on "Technology" and then on links to various topics listed at the left-hand margin. The ESA Website is a very rich source of information!
Galvanic cell primer (not yet rechargable!)
About "lemon batteries" (not rechargable, either!).
Rechargable batteries -- the table at the bottom is the most important!
Rechargable batteries -- comparison of major types.
Sodium-sulphur battery -- a very interesting option for making large stationary storage banks.
Another Web site about sodium-sulphur batteries.
About a new sodium-sulphur 4 MW storage facility in San Jose.
Vanadium-redox battery -- another highly promising option for a high-capacity electric power storing device.
News about a prototypical vanadium-redox storage facility.
An article from the May 2014 issue of Physics Today, with news from the "front of research" on large "grid-scale" rechargable batteries. Worth reading, the news are really excitnig!!!!