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That's just the thing, wind and solar don't displace the generating plants, they supplement them, demanding that their energy be paid for first if they happen to be generating. The dispatchable (responds to demand) plants they didn't replace sit idle during this time, and have fixed costs which don't go away just because they aren't in use at the moment.
People say, "but the fuel is free". Right, but as Elon points out with rocketry, fuel is cheap, it's the hardware that costs a ton.
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