- "If we don't get more power to the warp drive, we're all going to have to get out and push."
Power aboard starships could be re-routed from one system to another. In August of 2151, the power from the internal sensors was re-routed to the weapons system aboard the ECS Fortunate. (ENT: "Fortunate Son")
During the early 2250s, Constitution-class heavy cruisers were armed with a complement of directed energy weapons, that possessed enough power to destroy half a continent in a concentrated bombardment. (TOS: "The Cage")
It was discovered that the use of power disturbed the dimensional structure of universes that co-existed with one another – the use of too much power could close the interphasic bridge between intersecting universes. (TOS: "The Tholian Web")