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Case Study: Commercial Building
Stockland HQ, Sydney

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Cogent Energy has designed and installed a state of the art trigeneration plant on the rooftop of the Stockland headquarters located at 133 Castlereagh Street in Sydney.

The site comprises of premium commercial office space and retail shops. Due to limited space within the existing plantroom, a previously unused rooftop space has been utilised for equipment installation with an acoustic engine enclosure.

Building Owner:
133 Castlereagh St, Sydney
Building Description:
Commercial complex – premium offices & retail plaza
Building Size:
35,000 sqm
Plant Operational Date:
1 February 2009

Cogeneration Configuration


The Stockland HQ trigeneration plant comprises of a 772 kW MTU 4000 series engine that is connected in parallel to the grid. The engine is coupled to 475 kW Thermax exhaust absorption chiller and plate heat exchangers that provide 412 kW of heating capacity for the building space from the engine jacket water. The absorption chillers and heat exchangers are fully integrated into the building heating, chilled and condenser water systems.

The plant is set up to operate in grid parallel import and operates automatically during the peak and shoulder demand period.

Plant Capacities

Peak Electrical:
772 kW at 0.8 power factor
Peak Cooling:
475 kW
Peak Heating:
412 kW
Energy Efficiency:
80% Thermal Efficiency (estimated)


Highly reliable tri-gen solution with grid parallel import
Energy Efficiency:
5 star NABERS and 6 star Green Star
Estimated saving of up to 2,000 tonnes of CO2 per annum.

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