1.  A back-up power system at the coach station did operate but only lasted three hours.

2.  A big unknown is the fate of federal support for wind power.

3.  A brief electrical outage had sapped its power.

4.  A cause has a power to produce its effect.

5.  A central issue is whether two independent executives can share power effectively.

6.  A change of executive and legislative power was demanded.

7.  A clear shift of power away from the hospital consultants was apparent.

8.  A deal to free the hostages fell through, apparently because their release would have left the rebels without bargaining power.

9.  A drop in voltage can be more serious than a power cut.