Economic potential maps for "direct use" (i.e., the produced heat being used *as such*; no electricity is produced) constitute the most important result of ThermoGIS. The maps come from a techno-economic analysis. First, the *technical *feasibility of hot water production is calculated in the technical model using DoubletCalc1D, for each aquifer and per 1x1 km grid cell, using specified doublet parameters. Next, the *economic* potential is calculated using an economic model.

## Alternative scenarios

Alternative scenarios have been calculated to determine the effects of well stimulation and the addition of a heat pump.

## Uncertainty

It is assumed that the main uncertainty in the geothermal potential calculation is originating from uncertainty in the transmissivity (thickness x permeability). Using the uncertainty of thickness and permeability, a probability distribution curve of the transmissivity is constructed (thickness x permeability). From this distribution, the p90, p70, p50, p30 and p10 transmissivity values are calculated. The calculations have been run for each of these p-values resulting in the uncertainty range for the output maps.