- For the Star Trek: Starfleet Corps of Engineers eBook, please see Blackout (novel).
A blackout is the loss of the electricity supplied to a certain area.
Throughout the Battle of Cardassia, the Cardassian Rebellion sabotaged Cardassia Prime's communications, transportation and power systems, causing a planet-wide blackout. This disabled the Female Changeling's ability to command the Dominion ships during the battle, ultimately resulting in the allies' victory. (DS9: "What You Leave Behind")