The Conto Energia IV foresees begging this end of June until the end of 2011, a monthly reduction in scale of the feed in tariff rates. From 2012 on is planned a semi-annual reduction. The funding level is based on the PV system size and also depends on whether PV modules are installed on buildings or on open fields.  Maximum feed in tariff are valid for small installations and roof systems. This compensation will be paid for 20 years and stay constant in this time period. Solar plant operators receive additional revenue from the regular electricity sale besides the funded FIT. It will not be until 2013, when a new regulation will replace the existing separation of the two applied rates for electricity sales and energy output. Other key points in the new Conto Energia IV relate to compensation premiums for specific plants. So, for example applies an additional premium of 0.05 € / kWh for plants to be built on redeveloped asbestos surfaces, or a bonus of 5% for investment in industrial areas, quarries and landfills. Another bonus of 10% will be applied if the system operator builds the installation under use of at least 60% of the components fabricate of the European Union.