21.   In a heat wave in June, state regulators imposed rolling blackouts in northern California, partly because of the demands of the plugged-in New Economy.

22.   In those cases, the launch time was not announced until nine minutes before liftoff and a news blackout was imposed on virtually the entire flight.

23.   It was not clear when the blackout would be imposed.

24.   Managers of the state power grid imposed rolling blackouts across the state Monday and Tuesday because the power supply did not meet demand.

25.   So far, California has yet to impose any blackouts.

26.   Still, the alerts were a grim note for grid managers, who imposed blackouts on hundreds of thousands of Californians last week.

27.   The government in January imposed a blackout on news about the fighting.

28.   The government in January imposed a blackout on news about the war.

29.   The government imposed an indefinite curfew in Tamil-dominated northern Sri Lanka and imposed a blackout on reporting the war in the local media.

30.   The government in January imposed a blackout on news about the fighting and has detained several Angolan journalists who reported on battles.