Power grid or power transfer grid was an informal term for a system that sent energy throughout a starship, facility or even a planet. These grids could make use of electricity, electro-plasma or any number of energy sources. The Federation made use of a power grid known as the EPS, the primary energy distribution system on their ships and stations.

In 2152, Jonathan Archer reluctantly shut down the power grid aboard Enterprise NX-01 in preparation for an approaching neutronic wavefront. T'Pol assured him it was necessary in order to prevent a possible overload. (ENT: "The Catwalk")

A Xindi-Insectoid shuttlecraft discovered in 2154 was found to have routed almost half of its power grid to structural integrity. (ENT: "Hatchery")

In 2369, a power transfer grid failed on Deep Space 9, and the upper docking pylons were disabled as a result. (DS9: "A Man Alone")

The same year Chief Miles O'Brien accessed the power grid of the security check point four on the promenade to sabotage them. (DS9: "Captive Pursuit")

In 2370, Captain Jean-Luc Picard and Lieutenant commander Data returned from a three-day shuttle mission to retrieve a wayward photon torpedo to find thee USS Enterprise-D adrift. Picard was able to quickly re-establish attitude control from the bridge, but main power proved impossible to restore quickly, as the entire power transfer grid had been destroyed. (TNG: "Genesis")

In 2371, Lieutenant Joseph Carey came into conflict with B'Elanna Torres in engineering over the USS Voyager's power grid. Torres wanted to realign the lateral plasma conduit, which Carey told her would cause an overload in the power grid. (VOY: "Parallax")

Late that year, a Changeling impersonating Julian Bashir claimed as Bashir to be connecting a diagnostic console to the medical bay's power grid aboard the USS Defiant when confronted by O'Brien. (DS9: "The Adversary")

In 2372, Stevens and Muniz routed the output of the Defiant's phaser generator through the ship's secondary power grid. This was done in order to use the deflector array as a phaser emitter. (DS9: "Starship Down")

Soon after, Admiral Leyton had Red Squad sabotage the computers of the Division of Planetary Operations causing Earth's power grid to fail. (DS9: "Paradise Lost")

In an alternate timeline in 2374, a Krenim attack destroyed Voyager's power grid on Deck 11. Over two months later it was operating at thirty-two per cent efficiency, with Harry Kim predicting this could be increased to fifty per cent within a few days. (VOY: "Year of Hell", "Year of Hell, Part II")

Later that year, Voyager's power grid took a direct hit during a battle with Kovin. (VOY: "Retrospect")

Not long after, Seven of Nine expressed concern that damage to the power grid from combat with Allos' species could overload the harmonic resonance chamber in cargo bay 2. (VOY: "The Omega Directive")

The Orion Syndicate planned to interrupt the power grid of the Klingon embassy on Farius Prime and assassinate the ambassador before the backups came online. (DS9: "Honor Among Thieves")

Upon entering an energy barrier of a planet in the Rutharian sector, the Chaffee's power grid began to fail. (DS9: "The Sound of Her Voice")

The Borg cube which fought in the Battle of Sector 001 had heavily damage of its outer hull and Data also noted that it had fluctuations in its power grid. (Star Trek: First Contact)

In an alternate timeline created in 2375, Voyager was eventually discovered on the surface of a class L planet with its power grid destroyed. (VOY: "Timeless")

Voyager took a direct hit to the power grid during a firefight with Ven's species. (VOY: "Infinite Regress")

In 2375 in the mirror universe, Rom was able to take the power grid of the Regent's flagship offline, leaving it open to attack by the ISS Defiant. (DS9: "The Emperor's New Cloak")

In 2376, Tom Paris asked Harry Kim to reconfigure Alice's power distribution grid, in order to prevent blowing more power cells, but fatigue stopped them from proceeding. (VOY: "Alice")

According to the Star Trek: The Next Generation Technical Manual, the power grid transfered electricity from a source (usually a power converter fed by the EPS) to areas where it was needed using electrically-conductive wires or materials. The power transfer grid was similar to a main electrical grid on 20th and 21st century Earth.

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