1.   A drought or a heat wave could still cause rolling blackouts.

2.   In addition, the weeds clog cooling pipes for the transformers at the Owen Falls power plant, causing frequent blackouts.

3.   It cuts the risk of the grid running short of power and causing a blackout.

4.   Left uncontrolled, that extra energy production could have caused a blackout, Jones said.

5.   Low blood sugar also can cause blackouts.

6.   Officials said the blackout was caused by a freakish combination of events.

7.   Officials also stressed that the offers, while an important financial step, would not resolve the lingering shortages of power that caused rotating blackouts last week.

8.   Public Service Electric and Gas Co. said a substation shut down in central New Jersey this morning, causing blackouts in the area.

9.   The doctors quickly discovered the tumor that they said had probably caused the blackout that led to the accident in October.

10.   The shortage of electricity causes regular blackouts throughout the city.