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The question isn't very meaningful because rockets don't work like regular engines or motors.

A gasoline engine or electric motor produces a certain force (torque) at a certain speed (RPM). Multiplying torque by speed gives output power, which can be measured in horsepower or watts. A motor can produce more force at a lower speed, or less force at a higher speed while still producing the same power.

But rockets produce a force (thrust) that doesn't depend on speed. If you bolt a rocket to a test stand so it can't move, then it can't produce any power at all no matter how much propellant it burns or thrust it generates. Only when the rocket can move will it develop mechanical power. That power will increase with speed even when thrust remains constant.

But if we redefine the "power" of a rocket as the rate at which it burns fuel and produces heat, we can come up with a well-defined number. The F-1 engines on the first stage of the Saturn V burned RP-1 (Rocket Propellant 1), a specially refined form of kerosene, and the five engines burned it at a total rate of about 4 tonnes (4000 kg) every second. Burning RP-1 yields about 43 megajoules of energy per kilogram, so that's works out to a heat power of 564 gigawatts or 757 million horsepower.

By comparison, the average amount of electricity generated in the entire United States averaged 455 gigawatts during 2010. That's right, the Saturn V produced more power than the entire US electric grid (on average), but of course it only did it for a couple of minutes.

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