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Interest in and production of Renewable energy in Australia has undergone substantial growth over the past decade. It is estimated that Renewable energy produced 29,302 gigawatt hours (GWh) of electricity (or equivalent) over the year ending September 2011, which represents represents 9.6% of the total production in Australia. This compares to 2006 figures, where approximately 9,500 GWh of electricity came from renewable sources, representing less than 4% of electricity consumption for that year. Of all renewable energy sources in 2011, hydro represents 67.2%, wind 21. 9%, bioenergy 8.5%. solar PV 2.3%, solar thermal 0.015%, wave and tidal 0.003% and geothermal 0.002%. Additionally, solar water heating units have been calculated to have offset the equivalent of 2115 GWh of electricity per year which represents around 7.2% of total renewable energy production.