Phaser power was the source from which phaser energy was derived, inasmuch as it could be delivered at variable levels.

The rerouting of "all but emergency maintenance power to the shields" on the original Constitution-class starship, would reduce the ship's phaser power by fifty percent. (TOS: "The Tholian Web")

Later, in the redesigned Constitution-class refit, phaser power was increased" by channeling it through the main engines," so when if the ship experienced an antimatter imbalance, its phasers were automatically cut off. (Star Trek: The Motion Picture)

Phaser power aboard the USS Defiant was "almost doubled" by "running the plasma conduit through the primary phaser coupling". The process, which normally would affect a starship's warp drive efficiency, actually increased the Defiant's by thirty percent. (DS9: "Defiant")

See also

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