Do all generators come under the new Stage 5 regulations.

No, Non-Road Mobile Machinery (NRMM) applies to a wide range of traditional mobile equipment in construction, such as mobile generators – including wheeled trailers and models that are designed to be moved to different work locations, such as those commonly used by equipment rental companies.

However, you can still purchase non-compliant machines if they’re for a Standby application i.e. not to be moved from location to location.