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7 votes

Wind farms that wind up in the wind, and then unwind producing energy when the wind is still

You've described energy storage, or physical batteries. You wouldn't need half of each wind farm dedicated to this; you would simply store the excess, beyond what is used at a given time. It's not wei …
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2 votes

natural gas-fired power plants

The answer to the energy content of natural gas is a matter of chemistry. Natural gas (methane) is $\mathrm{CH}_4$, and Carbon-Hydrogen bonds contain a good deal of energy per bond, which are broken w …
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