Green electricity in Australia is available from a number of utilities that supply electricity from environmentally friendly energy sources that are renewable and non-polluting. In Australia green energy is accredited under the GreenPower scheme whereby all distributors are government audited bi-annually to ensure that customers are getting exactly what is described in their purchased products. The growth and development of the green energy industry was tracked in Australia by the ALTEX-Australia alternative energy index from 2006 to 2011.