This study has been completed to provide Callide B Power Station with the possible theoretical reduction in water use with minimum impact on station performance with the implementation of hybrid cooling. To achieve this, a number of models have been developed that take into account a wide variety of ambient conditions at full load and calculates the reduction in water consumption and change in station performance. Recommendations have been derived from this model in regards to the options available to Callide B Power Station to achieve a significant reduction in water consumption. The results show that a significant amount of water can be conserved with minimal impact on station performance. The conclusion drawn is that, though a significant reduction in water use with minimum effect on station performance is possible with hybrid cooling, it is not a financially viable option.