The legislation (the Renewable Energy (Electricity) Act 2000) places a legal liability on most wholesale purchasers of electricity and large users to contribute proportionally towards the annual targets that increase to 9,500 GWh in 2010 and remain at that level until the measure expires in 2020. If they fail to meet required targets of renewable energy purchase, they face a penalty. Penalty could be avoided by purchasing renewable energy certificate through the market.Political issues such as the changes of political party or decisions could bring influence to an industry.According to Reuters, the parliament had passed the amendments to the nation’s renewable energy target scheme, splitting it into by small-scale and large-scale. The large-scale Renewable Energy Target will benefit renewable energy companies that have stockpiled cheap certificates.Small-scale Renewable Energy Scheme (SRES) has been introduced to help household and small businesses with installation of eligible renewable energy systems, such as solar water heater (Department of Climate Change and Energy Efficiency 2010). The Solar Homes and Communities Plan helped Australian homes and communities reduce their energy use and bills and better the environment. It successfully installed more than 100,000 systems as of the end of April 2010 and helped to increased accredited solar panel installers over the last year to more than 1,900.