Don’t require power plug adapter while traveling from Tonga to Cocos (Keeling) Islands.

Here's why you do not need an adapter

The outlet and plug type used in Cocos (Keeling) Islands is I and in Tonga is I and they are compatible with each other.

Tonga

In Tonga, outlets of type I are in use.

Type I

Cocos (Keeling) Islands

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

Type I