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Memory Alpha

Grey Mode is an alert status used aboard Federation Starships. When in Grey Mode, the Starship runs on reserve power, cutting power to non-essential decks and ship systems.

Grey Mode was used aboard the USS Voyager in 2374 when its supply of deuterium was almost depleted, allowing the ship to conserve its reserves for as long as possible. (VOY: "Demon") The ship also went into Grey Mode the following year in an attempt to sneak past a Devore detection grid. (VOY: "Counterpoint")

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