Holyroyd To Rookwood 330K V Installation
Holyroyd To Rookwood 330K V Installation 2
Panorama Substation Oil Containment


Diona is the provider of choice for high voltage transmission works. Cable selection, construction methods and cable support are crucial to the overall project success. Our award winning experience is without peer in the industry. Whether it’s a desalination plant requiring power, your substation, or a train station, Diona has the solution for you.


Diona has over 20 years supporting the power industry in distribution. Our award-winning teams sit on nine electricity panels within Australia.

Diona is not a general contractor; we are a utilities specialist. We understand network requirements and the interfaces with other utilities.

Diona delivers right from inception to construction; from 11kV padmounts to 330kV cable installations, we scale our approach to meet your specific needs.


Diona holds accreditation to access and work on substations. Our capabilities cover all aspects, whether it’s the requirements for earthing and their interface to the structure, or the need to work with the cables in the zone.


Overhead works are a high community impact item, principally because of the size of the specialist equipment involved.

Lifter borers and elevated work platforms (EWPs) take room and require planning. Community impact is central to what we do and how we do it. Whether it is taking an existing overhead asset underground, UGOH installation, or augmentation of the network, Diona has a solution that will suit your needs.

Diona should be congratulated on completing this very successful project to the requirements of the contract specification in a manner that met Ausgrid’s expectations in full. I would recommend Diona for any infrastructure project and I look forward to working with them in the future.​
G. Doherty - Project Manager - Ausgrid CBD Project
Given that the East and Parramatta 132kV project was vital to Endeavour Energy, Diona performed very well. The senior project manager was very pleased with their performance.
John Mifflin, Endeavour Energy
A well controlled project. Diona displayed an ability to co-ordinate multiple work sites and address unforeseen conditions or variations with minimal program effect.
Phil Stone, Energy Australia (Ausgrid) on the Newcastle 33kV Feeder Project
Diona displayed a very high level of professionalism and flexibility throughout the entire project.
Kek Tang on the Transgrid 330kV Feeder Project