Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
It is a fleet of 80-100 reactors - individual ones going offline for maintenance/ect will not correlate in the same way a pressure system above the north sea will, so the storage systems only have to deal with demand side diurnal variations, not supply. There may be an assumption in there that electrifying transport and industry to this extent flattens those variations, as well. If that does not happen, option 4 (20 gigs of pumped) ought to cover it.  
by Thomas on Sat Oct 13th, 2012 at 02:30:08 AM EST
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