You Do Need power plug adapter while traveling from South Sudan to Niger.

Here is Why You Need An Adapter

The outlet and plug type used in Niger are C, D, E and F and in South Sudan are C and D. This is how they look like.

South Sudan

In South Sudan, outlets of type C and D are in use.

Type C

Type D

Niger

In Niger, outlets of type C, D, E and F are in use.

Type C

Type D

Type E

Type F