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Case Study: Commercial/Retail
275 Kent Street (Westpac Place), Sydney

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Cogent Energy has designed and installed a state of the art trigeneration plant at 275 Kent St (Westpac Place), Sydney. This building is fully owned by Mirvac and is one of the largest office buildings in Australia, with the major tenant being Westpac – street-sydney. This retrofit solution formed a major part of Mirvac’s energy efficiency improvement program to increase the building’s NABERS rating.

Building Owner:
275 Kent Street, Sydney
Building Description:
Commercial complex – premium offices & retail space
Building Size:
77,000 sqm Commercial
Plant Operational Date:
April 2013
Peak Electrical:
1200 kW at 0.8 power factor
Peak Cooling:
750 kW
Peak Heating:
600 kW
Energy Efficiency:
85% Overall efficiency (estimated) compared to using grid electricity

Tri-Generation Plant Capacities

The 275 Kent Street trigeneration plant comprises of a 1200 kW MWM TCG2020V12 natural gas engine connected in parallel to the grid. The generator is installed on Level 4 in a custom designed acoustic enclosure and sits on pneumatic air bags preventing noise and vibration to the tenancy below. The engine is coupled to a 750 kW Broad exhaust fired absorption chiller. The absorption chiller is fully integrated into the building’s air conditioning, chilled and condenser water systems. Additionally, the trigeneration plant provides 600 kW of heating for use in the building’s HVAC systems.

The plant is set up to operate in grid parallel import/export mode and operates automatically during the peak and shoulder demand. Cogentpower1 is a product that allows the export of low carbon electricity across multiple switchboards to obtain the full benefit of cleaner natural gas as a fuel source. Cogent Energy is currently uniquely placed to provide this solution.


Energy Efficiency:
4.0 star NABERS2
Estimated savings of up to 2,380 tonnes of CO2 per annum3
The plant will normally operate from 6am to 8pm, Monday-Friday.

For More Information

For more information about Cogent Energy contact one of our consultants at 03 9652 5025.

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1 Refer to for further information

2 Refer to for current published ratings

3 CO2 savings estimations are calculated based on information from the Australian Government’s National Greenhouse Accounts Factors (June 2013). Calculation methodology externally reviewed by PAE Holmes.