Measures in the field are as follows: ..  Devising a path to reach a 15% share of renewable energy sources in the sustainable use of final energy, broken down into individual energy types, namely: electricity, heat, cold and renewable energy in transport;.  Retaining the obligation to gradually increase the share of bio-components in transport fuels so as to meet the planned objectives;.  Retaining support mechanisms for producers of electricity from renewable sources, e.g. by means of a system of certificates of origin; Introducing additional support instruments encouraging more extensive production of heat and cold from renewable energy sources; Implementing the directions of building agricultural biogas plants, on the assumption that at least one biogas plant is set up in each commune by 2020;.  Creating conditions to facilitate making investment decisions on building off-shore wind farms;.  Retaining the principle of exempting energy from renewable sources from excise tax; Direct support to building new renewable energy generation units and power grids that could be connected with the use of European funds and environmental protection funds, including funds gathered in the form of the substitute fee and fines;   Stimulating the development of the Polish industry's which manufactures machinery for the renewable energy sector, also with the use of European funds;.  Supporting the development of technologies and building installations to obtain renewable energy from waste comprised of biodegradable materials (e.g. municipal waste with biodegradable fractions);  Evaluation of plausibility of using the existing damming structures owned by the State Treasury to generate power by way of taking their inventory, establishing their framework environmental impact, and devising the rules of making them available. Apart from the above measures, the implementation of the Long-term Programme for Promotion of Biofuels or Other Renewable Fuels in Transport for the years 2008-2014, adopted by the Council of Ministers on 24 July 2007, will be continued.