Temporal displacement drive

From Memory Alpha, the free Star Trek reference

The temporal displacement drive is an expansion of the warp drive, manipulating the curvatures of space-time with great precision, allowing starships to travel through many centuries into the past, or into the future. The drive produces usable energy, most likely through tapping into energy stored in Space-Time itself. (ENT: "Future Tense")

It is known that this is what powers a 31st century time pod.