You Do Need power plug adapter while traveling from Western Sahara to Norfolk Island.

Here is Why You Need An Adapter

The outlet and plug type used in Norfolk Island is I and in Western Sahara are C and E. This is how they look like.

Western Sahara

In Western Sahara, outlets of type C and E are in use.

Type C

Type E

Norfolk Island

In Norfolk Island, outlets of type I are in use.

Type I