Annual membership is offered in five categories to capture the size and needs of all organisations in the resources and energy industry.

Category Employee Numbers Revenue
Category 1 0 – 200 <$10 million
Category 2 201 – 500 <$50 million
Category 3 501 – 900 <500 million
Category 4 901 – 1500 <$1 billion
Category 5 1501 + >$1 billion