You Do Need power plug adapter while traveling from South Africa to Greenland.

Here is Why You Need An Adapter

The outlet and plug type used in Greenland are C, E, F and K and in South Africa are C, M and N. This is how they look like.

South Africa

In South Africa, outlets of type C, M and N are in use.

Type C

Type M

Type N

Greenland

In Greenland, outlets of type C, E, F and K are in use.

Type C

Type E

Type F

Type K