The Kolhari were a civilization in the Delta Quadrant, whose technology utilized tetryon power cells.

On stardate 49522, Commander Chakotay, first officer of the USS Voyager, recommended establishing trade relations with the Kolhari to Captain Janeway. In 2376, Seven of Nine cited this incident as evidence of a supposed conspiracy to resurrect the Maquis rebellion. (VOY: "The Voyager Conspiracy")

This species was only mentioned in dialogue.
The stardate given would place Voyager's contact with the Kolhari between the episodes "Lifesigns" and "Deadlock".
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