An EPS grid is a component of the electro-plasma distribution network on 22nd century Starfleet vessels. In the event of an emergency, the grid may be shut down to avoid an overload.

In 2151 Lieutenant Reed bypassed the EPS grid to receive power from the impulse drive to get the phase cannon online, Tucker denied this possibility, but later allowed it though (ENT: "Silent Enemy")

In August of 2152, while under the influence of radiation emanating from a nearby singularity, Malcolm Reed requested Trip Tucker's assistance in preparing an emergency shutdown procedure for the EPS grid. (ENT: "Singularity")