Mundubbera Substation Queensland

The Mundubbera Town 66/11kV substation has reverse power flow primarily from residential and commercial rooftop solar growth. To manage these flows, and the forecast significant growth into this and the wider zone substation network at ISIS 132/66kV Bulk Supply Point (BSP), Egis’ Energy team (formerly Peracon*) designed a Battery Energy Storage System (BESS).

Energy Queensland wanted to deliver this programme of work rapidly to meet the needs of the network. This was the first of 18 similar projects that the team has worked on.

*Peracon was acquired by Egis in March 2025.

The Egis team devised an innovative structural solution to allow deployment of the BESS at each substation. Rather than a large concrete slab to support the skid-mounted BESS unit, the engineers developed a solution of concrete sleepers. This enabled the sleepers to be manufactured offsite with a repeatable design leading to a reduction in time on site with construction. This solution improved the delivery of this programme of works.

Services provided included the design of:

Overall yard design for BESS system
11kV Voltage Electrical Design
Low Voltage Electrical System
DC Electrical System
Protection Scheme
Lightning Protection assessment
Earthing Grid assessment and design
Civil/structural design for the BESS yard

Egis was selected as the desired design house because of the team’s familiarity with the Energy Queensland standards and a good working relationship with their staff.

Mundubbera Substation.

Client.

Timeline.

Key Figures.

The challenge.

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Achieve.