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Redundancy costs? Any time the marginal gas plants already there don't run, they are avoiding the likely staggering fuel costs of the future. That's a value, bolstered by their ability to be turned on when needed.
My point here is that (say) the costs of running a gas fired power station are 50% fixed, 50% variable (i.e. proportionate to the about of electricity produced - due mainly to the cost of the input fuel).
The Unit cost of electricity from such a plant operating at 10% capacity (i.e. only at times of extreme peak demand/low average wind speeds) is (50+50/10)/10 = 5.5 per 1% unit capacity
If that same plant is operating at 50% capacity the equivalent unit costs is (50+50/2)/50 = 1.5 per 1% unit capacity - in other words almost 4 times cheaper. Thus there is a marginal cost to maintaining more redundancy because of greater intermittency in the system.
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