You Do Need power plug adapter while traveling from Macau to Cocos (Keeling) Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Cocos (Keeling) Islands is I and in Macau is G. This is how they look like.

In Macau, outlets of type G are in use.

Type G

In Cocos (Keeling) Islands, outlets of type I are in use.

Type I

I am from

going to