**A. Kalinichenko**^{1}, V. Havrysh^{2}

*1) Opole University, Ople, PL; 2) Mykolayiv National Agrarian University, UA*

#### ENVIRONMENTALLY FRIENDLY FUEL USAGE: ECONOMIC MARGIN OF FEASIBILITY

Energy and environent are one the worlds great concerns. One of its common solutions is the use of alternative transport fuels. To solve them alternative fuels for vehicle have to be used. Industrial decision making should be supported by a mathematical model. Three submodels were used in the suggested mathematical model. Two submodels were created in our study. They allow to use the profitability index as ground for possible investment. The proposed algorithm includes following stages: calculation of the fuel energy cost; calculation of the vehicles criteria; determining the maximum volume of investment; making decisions. Different kinds of biofuels and gaseous fuels for certain countries have been studied. Also the economical attractiveness of the model results has been presented.

**Keywords:** environment, alternative fuel, profitability index, mathematical model