Completion of Mortlake Power Station's second unit has been delayed so an inspection can be conducted of the generator following a switchyard fault that occurred during the final stages of the unit's commissioning. This inspection will be conducted during the 2012 March quarter.

The power station – which is located near Mortlake in south-western Victoria – has two gas turbines and aims to meet the growing demand for peak electricity in eastern Australia.

The project also involved construction of an 83 km underground natural gas transmission pipeline. The power station will be powered by natural gas sourced from Origin's portfolio of gas supply arrangements in the Otway area, with direct access to gas from the Otway Gas Plant and gas storage at Iona.

Origin has the option to expand the capacity of Mortlake Power Station in the future. Furthermore the power station has been designed to enable its future conversion to a highly efficient combined-cycle plant.