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The region of Aachen-Weisweiler represents a green field region for geothermal exploration. Sparse data coverage and a complex geological setting are associated with high uncertainties. We present a workflow for assessing the thermal yield of a potential geothermal system in such a green field environment, considering uncertainties in, among others, geological structure, rock parameters. In this uncertainty framework, we also incorporate exploration risk expressed as probabilities of certain cases, e.g. the overall occurrence of a potential reservoir layer at a potential drilling location. Risks are of utmost importance in greenfield areas, such as the Aachen-Weisweiler region. Their careful assessment is therefore crucial. With increasing data coverage, and concomitant information gain, uncertainties get better constrained, and the independent risk assessment for some parameters gets less crucial.