In Star Trek: The Next Generation, what system powers a starship's internal electrical equipment?

In Star Trek: The Next Generation, the electro-plasma system powers a starship's internal electrical equipment.

The electro-plasma system, commonly abbreviated EPS, distributes energy through a starship. It carries high-energy plasma from major power sources such as the warp core to equipment throughout the vessel. Episodes and technical dialogue refer to EPS conduits, relays, taps, and power transfers when systems are damaged or overloaded.

EPS is a shipwide distribution system rather than a single engine. The warp core generates power, while the electro-plasma system moves that power to propulsion, weapons, shields, sensors, life support, and other consumers. This distinction helps explain why a ship can still have a functioning warp core while particular decks or systems lose power.

The phrase is frequently confused with the warp core, which is the main matter-antimatter power-generation assembly. EPS also differs from the fictional isolinear optical computer network, which handles data and control functions rather than serving as the main energy distribution grid.