This Part   is about some of the key concepts used in this Act, and the inter - relationships between those concepts.

This Act applies to GEMS products, which are products that use energy, or affect the amount of energy used by another product, and belong to a product class for which a GEMS determination has been made (under Part   4).

GEMS products may be determined to be category A products or category B products. Category B products have a higher impact on energy use or greenhouse gas production than category A products. Different penalty levels apply to contraventions of the main rules about supply and use of GEMS products in Part   3, depending on the category of the product.

GEMS products belong to a particular model if they have the same technical specifications, brand name (or manufacturer) and a unique identifier. Generally speaking, all models of GEMS products must be registered under Part   5 (in the GEMS Register) against GEMS determinations.

A model's registration may be affected by a replacement determination updating the GEMS determination against which the model was initially registered. This might affect whether products of the model can be supplied, or used for commercial purposes.

There is a broad concept of supply and offer to supply. This affects the application of the main rules in Division   2 of Part   3 about supplying and offering to supply GEMS products.