The volumetric method is one of the most applicable methods of low-temperature geothermal resource assessment. While applying volumetric method, the values of uncertain parameters should be determined. An add-in software program to Microsoft EXCEL, @RISK, is used as a tool to define the uncertainties of the parameters in the volumetric equation. Monte Carlo simulation is used as the probabilistic approach for the assessment of low temperature in north-eastern Morocco. In this region, the utilisation of this resource is limited. Assessment studies using triangular and uniform distribution type functions for each parameter are used to give the mean values of recoverable heat energy of the field.
