Ausgrid Substation Oil Containment Infrastructure Upgrade


Various Locations, New South Wales, Australia


Diona was engaged to upgrade Oil Containment Infrastructure in 44 substations across New South Wales to help Ausgrid to comply with Environmental Protection Agency (EPA) guidelines. The upgrade was necessary due to oil escaping from the existing pits, drainage lines and oil containment tanks and contaminating the surrounding ground.

The contract was awarded in two phases. The first phase involved 18 substations throughout Sydney metro and the Hunter region. On successful completion of the first phase, Diona was awarded the second phase of 26 substations, which ranged from the Sydney metro, Central Coast, Newcastle and the Hunter region.

Due to the large variation in types of old constructed substations, a certain quantity of design and scope change occurred throughout the project, with Diona offering a number of smart solutions to save time and money for the client.

Safety 1st

As with working in any substation, safety was our team’s number one priority. Particular safety considerations for this project included removal and disposal of asbestos, working in confined spaces, shoring of trenches in close proximity to existing services, overhead structures and buzz bar footings. Careful planning was undertaken to mitigate these risks.

Other challenges that had to be overcome included considering logistics and the location of each substation. It was also necessary to coordinate a number of staged outages with Ausgrid to enable work on transformers. This meant a great deal of forward planning between Diona and Ausgrid to coordinate this, while bearing in mind that the number one priority for Ausgrid was keeping the lights on for their customers. Additionally, access to each site was necessary at all times by Ausgrid’s Emergency Team, 24 hours a day, in the event of an emergency situation. Diona worked closely with Ausgrid with detailed planning before works commenced on site to ensure they would always have full access.

Diona and Ausgrid worked closely to achieve a successful outcome on all 44 substations. Ausgrid are now fully compliant with the EPA guidelines and their substations are now pollution free, which should remain for future generations.


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