In 2005 the mine used 1.31 MegaLitres of water for every GigaWatt hour of power generated.The plant generates a peak of 1.6GigaWatts. There are 8760 hours in a year. If the plant was running at peak capacity this would equate to (1.31ML / GWh) * 8760h = 11475 ML per year. At an average of half capacity this is still 5 GigaLitres per year.
The Thomson dam has a capacity of about 1000 GigaLitres.
