To date there has not been a long-term study of the performance of the four buildings in terms of their energy use so quantifiable data is not available. The various energy rating systems currently in use in more temperate regions of Australia have yet to be successfully adapted for use in the tropics so the only means of successfully rating the energy use of the buildings is through empirical data obtained from on-site measurements – a complex and lengthy process.
However, due to the adoption of passive design principles and sensible selection of fittings and appliances, energy use in three of the four buildings would be expected to be low with much of this energy provided at minimal cost through the use of a sustainable power generation system. Lighting is minimal and low-energy fluorescent light fittings have been used wherever possible. Cooking appliances and refrigeration operate on LP gas that is considerably more economical than electricity and cooling, in the form of ceiling fans, is very efficient.
It is expected that the air-conditioned laboratory building would be the major energy consuming building within the complex. Design strategies were aimed at lowering energy use by reducing the heat load on the building envelope through the use of insulated wall and ceiling panels and by shading all external walls. The laboratory can also be opened to cooling breezes during the cooler months, which coincides with the greatest demand on the building. However, the performance of the laboratory in terms of energy conservation would not be expected to be outstanding due in part to the inefficient air-conditioning system installed in the building as a result of cost constraints and maintenance requirements.