Every power system needs spare capacity to deal with surges, supply disruptions and so on.

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The current strain shows that the electric power system is at capacity even though there has been little economic growth.

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The U.S. bulk power system, at an aggregate level, has adequate spare capacity to absorb potential retirements.

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With the right combination of capacity, performance and rapid power cycling storage system designs can pump more iron while keeping cool and saving energy.

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Only a modest amount of reserve capacity is needed to keep the system from going down when one or a few power plants crash.

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