In demand solar project

TransGrid, one of Australia’s largest high-voltage transmission networks, wanted to meet more of its energy consumption through a sustainable energy source. Due to this, iDemand – a hybrid energy project combining solar power, energy storage and efficient lighting was created to reduce the peak energy demand at TransGrid’s Wallgrove Regional Centre in Western Sydney.

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TransGrid is the owner, operator and manager of the NSW high voltage network connecting generators, distributors and major end users in New South Wales and the ACT. Its network has 12,656 kilometres of high voltage transmission lines and underground cables, plus 91 substations.

The iDemand project is expected to shave off almost half of the electricity usage at the Wallgrove Regional Centre during peak demand times, achieving a substantial amount of financial savings and CO2 emissions for TransGrid’s operations.

TransGrid awarded Solgen Energy Group both the civil works contract and the solar power contract including both a 50kW car park array and a solar array atop of its 3kW battery container.

Solgen lead the design for an underground framework that could support the solar power array on the surface, and allow for car park spaces and pedestrian traffic.

Solar power project details

Location:Eastern Creek, NSW
Date completed:September 2014
Solar system peak capacity:50kWp
Panels:200 x Suntech Poly 250W modules
Inverter:3 x SMA Sunny Tripower 17000TL
Green savings:78.2 tonnes of emissions annually
Solar electricity generated:73.1 Megawatt hours each year

The innovative carport framing solution was designed and implemented with a 2.2m clearance level above ground. Five equally spaced supporting foundations were also constructed with car spaces in between. This innovative design allows for easy access for vehicles and pedestrians while also providing the perfect tilt and ventilation for the solar panels to perform at high efficiency.

To eliminate any potential dangers to passersby, the cables were placed underground using existing pits and conduits. A security cage, complete with a Colorbond roof was constructed to house the external inverter station and restrict public access to the electrical equipment.

Solgen was able to successfully complete the civil works component of the project by acting as the centre of communication, collaborating with all parties involved and developing a consolidated solution to install the underground cable and carport framing network for the entire system.

The TransGrid iDemand project was a great success and was launched by TransGrid officially in November 2014.


The installation of the TransGrid 50kW photovoltaic system will:

  • Generate an estimated energy output of 73.1MWh annually.
  • Offset 78.2 tonnes of CO2 each year.
  • Demonstrate TransGrid’s commitment and core focus to sustainable energy consumption and the reduction of electricity demand.
  • Through the installation of the solar panels, provide shading for the centre car park.

To enquire about how solar can facilitate your business, contact our energy consultants today.


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