In these days the importance of alternate energy resources is growing. There are more and more technologies available of size and at price suitable for households. In our paper the possibilities of solar energy, wind power, geothermal energy and biogas energy use are shown. In the study the instruments are chosen from the market and the installation costs and the produced power are calculated. On the basis of these, various economic calculations are made regarding the returns of the investment, for example: net present value, rate of return, payback period. The result shows that biogas is the one economic investment of them in this economic environment.