Comment Re:Conditions Apply (Score 2, Interesting) 635
How do all of these storage solutions scale?
EG Pumped storage for all of Chicago would require putting an area comparable to Chicago's underwater (600 km^2).
Pumped storage has an capacity of a few Watts per m^2 depending on the depth change available (typically a few meters). Chicago uses energy at an average rate of 20 GW so you need an area on the order of 10^10 m^2 or a square area that is 100km on a side.
BTW In Illinois about half the power comes from nuclear, the other half from coal.