EO4 is a transmission pipeline located in central Queensland. The pipeline is owned by Queensland Gas Company (QGC).

The EO4 pipeline connects the Windibri Central Processing Plant to the the Kenya Central Processing Plant.

EO4 is currently a non-scheme pipeline and is subject to the access regime for non-scheme pipelines under Part 10 of the National Gas Rules (NGR). It was previously subject to the access regime for non-scheme pipelines under the former Part 23 of the NGR, which was replaced by Part 10.

The AER has granted the following exemptions for EO4:

• On 1 March 2019, a five year Category 1 and Category 2 exemption under Part 23 of the NGR.
• On 9 April 2024, a five year Category 1 exemption under Part 10 of the NGR.